{"id":11930,"date":"2025-10-10T07:06:54","date_gmt":"2025-10-10T07:06:54","guid":{"rendered":"https:\/\/www.retopz.com\/?p=11930"},"modified":"2025-10-10T07:53:33","modified_gmt":"2025-10-10T07:53:33","slug":"leaching-in-tungsten-carbide-seal-faces-causes-symptoms-and-mitigation","status":"publish","type":"post","link":"https:\/\/www.retopz.com\/ar\/leaching-in-tungsten-carbide-seal-faces-causes-symptoms-and-mitigation\/","title":{"rendered":"Leaching in Tungsten Carbide Seal Faces: Causes, Symptoms, and Mitigation"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"11930\" class=\"elementor elementor-11930\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e2f5ca7 e-flex e-con-boxed e-con e-parent\" data-id=\"e2f5ca7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6a826e3 elementor-widget elementor-widget-text-editor\" data-id=\"6a826e3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"p1\">Tungsten carbide seal faces are known for their excellent <a href=\"https:\/\/www.retopz.com\/ar\/hardness-in-the-tungsten-carbide-industry-a-comprehensive-definition\/\" target=\"_blank\" rel=\"noopener\">\u0635\u0644\u0627\u0628\u0629<\/a> \u0648 <a href=\"https:\/\/www.retopz.com\/ar\/wear-resistance-in-the-tungsten-carbide-industry-an-explanatory-overview\/\" target=\"_blank\" rel=\"noopener\">\u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062a\u0622\u0643\u0644<\/a>.<\/p><p class=\"p1\">They are used in pumps, mixers, and compressors across industries such as chemical processing,<a href=\"https:\/\/www.retopz.com\/ar\/tungsten-carbide-tools-in-the-oil-and-gas-industry\/\" target=\"_blank\" rel=\"noopener\"> \u0627\u0644\u0646\u0641\u0637 \u0648\u0627\u0644\u063a\u0627\u0632<\/a>, and water treatment.<\/p><p class=\"p1\">Despite their toughness, these seal faces are not immune to all forms of damage.<\/p><p class=\"p1\">One issue that quietly develops in some applications is leaching\u2014a chemical attack that removes the metallic binder from the carbide structure.<\/p><p class=\"p1\">Leaching can weaken the seal surface, increase leakage, and cause early failure.<\/p><p class=\"p1\">This article explains the causes, symptoms, and prevention of leaching, using real-world examples to help plant managers and engineers identify and mitigate it effectively.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e5e7a9a e-flex e-con-boxed e-con e-parent\" data-id=\"e5e7a9a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-705d959 elementor-widget elementor-widget-text-editor\" data-id=\"705d959\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"p1\"><b>What Is Leaching?<\/b><\/h2><p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-11913 size-full\" src=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-1.jpg\" alt=\"\" width=\"660\" height=\"440\" srcset=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-1.jpg 660w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-1-300x200.jpg 300w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-1-18x12.jpg 18w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p><p class=\"p3\">Tungsten carbide is a composite material. It consists of hard WC (tungsten carbide) grains bonded together with a softer metal binder\u2014usually cobalt or nickel. The binder gives<a href=\"https:\/\/www.retopz.com\/ar\/toughness-in-the-tungsten-carbide-industry-a-comprehensive-definition\/\" target=\"_blank\" rel=\"noopener\"> \u0635\u0644\u0627\u0628\u0629<\/a> and holds the structure together.<\/p><p class=\"p3\">Leaching happens when the binder is chemically dissolved by the process fluid.<\/p><p class=\"p3\">The tungsten carbide grains remain, but without binder support, they become loose, and the surface becomes porous and weak.<\/p><p class=\"p3\">A simple way to imagine it: think of the binder as the \u201cglue\u201d between bricks. If the glue dissolves, the wall is still standing\u2014but fragile and ready to crumble.<\/p><p class=\"p3\">Leaching is not caused by friction like normal wear. It is chemical corrosion, often accelerated by temperature, fluid chemistry, and electrochemical effects.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-94cc15d e-flex e-con-boxed e-con e-parent\" data-id=\"94cc15d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a35c7f6 elementor-widget elementor-widget-text-editor\" data-id=\"a35c7f6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"p1\"><b>Real-World Example: Chemical Pump in Acidic Service<\/b><\/h2><p><img decoding=\"async\" class=\"alignnone wp-image-11914 size-full\" src=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-2.jpg\" alt=\"\" width=\"660\" height=\"440\" srcset=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-2.jpg 660w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-2-300x200.jpg 300w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-2-18x12.jpg 18w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p><p class=\"p3\">In one petrochemical plant, a pump handling dilute hydrochloric acid showed premature seal failure after only six months.<\/p><p class=\"p3\">When the seal faces were inspected, engineers noticed dull, etched surfaces and micro-pitting under a microscope. Chemical analysis of the flush fluid showed traces of cobalt ions.<\/p><p class=\"p3\">The investigation confirmed binder leaching. The cobalt in the tungsten carbide face had dissolved in the acidic environment.<\/p><p class=\"p3\">The problem was solved by switching to a nickel-bonded tungsten carbide grade and adding a thin protective coating.<\/p><p class=\"p3\">After the change, the seals lasted over two years without similar damage.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9c3f441 e-flex e-con-boxed e-con e-parent\" data-id=\"9c3f441\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9978d52 elementor-widget elementor-widget-text-editor\" data-id=\"9978d52\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"p1\"><b>Causes of Leaching<\/b><\/h2><p><img decoding=\"async\" class=\"alignnone wp-image-11915 size-full\" src=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-3.jpg\" alt=\"\" width=\"660\" height=\"440\" srcset=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-3.jpg 660w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-3-300x200.jpg 300w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-3-18x12.jpg 18w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p><p class=\"p3\"><b>1). Aggressive Fluids<\/b><\/p><p class=\"p4\">Fluids with strong acids, alkalis, or high chloride content can attack the binder metal.<\/p><p class=\"p4\">\u0645\u062b\u0627\u0644:<\/p><ul class=\"ul1\"><li class=\"li4\"><p>Seawater pumps often suffer leaching because chlorides aggressively dissolve cobalt.<\/p><\/li><li class=\"li4\"><p>In paper mills, alkaline white water can attack carbide binders over time.<\/p><\/li><\/ul><p class=\"p3\"><b>2). High Temperature<\/b><\/p><p class=\"p4\">Higher temperatures increase the reaction rate. If a seal face overheats due to poor cooling or dry running, the leaching process speeds up.<\/p><p class=\"p4\">\u0645\u062b\u0627\u0644:<\/p><p class=\"p4\">In refinery pumps running at 180\u00b0C, cobalt leaching is often observed near the hottest contact zones, especially when flush flow is restricted.<\/p><p class=\"p3\"><b>3). Electrochemical Action<\/b><\/p><p class=\"p4\">If dissimilar metals are in contact through a conductive fluid, galvanic corrosion can occur. The cobalt binder may become the \u201canode\u201d and dissolve.<\/p><p class=\"p4\">\u0645\u062b\u0627\u0644:<\/p><p>A pump with stainless steel housing and tungsten carbide faces experienced leaching due to stray current and galvanic potential. Isolating the seal electrically solved the issue.<\/p><p><b>4). Unsuitable Material Grade<\/b><\/p><p>Grades with high cobalt content are tougher but less <a href=\"https:\/\/www.retopz.com\/ar\/corrosion-resistance-in-the-tungsten-carbide-industry-an-explanatory-overview\/\" target=\"_blank\" rel=\"noopener\">corrosion-resistant<\/a>. Using them in acidic or chloride-rich fluids invites trouble.<\/p><p>\u0645\u062b\u0627\u0644:<\/p><p class=\"p4\">A food-processing plant using cobalt-bonded tungsten carbide in a cleaning solution with chlorine reported frequent seal dulling. After switching to binderless carbide, the issue disappeared.<\/p><p class=\"p3\"><b>5). Stagnant or Low Flow Zones<\/b><\/p><p class=\"p4\">If the flush flow is poor, aggressive fluid remains near the seal face longer, increasing attack time.<\/p><p class=\"p4\">Good flow acts like self-cleaning; poor flow makes local chemistry more concentrated and damaging.<\/p><p class=\"p3\"><b>6). Lack of Protective Coatings<\/b><\/p><p class=\"p4\">A thin coating like DLC (diamond-like carbon) or chromium nitride can block chemical access to the binder.<\/p><p class=\"p4\">Without such protection, even mild corrosive fluids can slowly leach the surface.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-515c716 e-flex e-con-boxed e-con e-parent\" data-id=\"515c716\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-778e495 elementor-widget elementor-widget-text-editor\" data-id=\"778e495\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 class=\"p1\"><b>Symptoms and Early Warning Signs<\/b><\/h3><p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-11916 size-full\" src=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-4.jpg\" alt=\"\" width=\"660\" height=\"440\" srcset=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-4.jpg 660w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-4-300x200.jpg 300w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-4-18x12.jpg 18w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p><p class=\"p3\">Spotting leaching early can prevent expensive shutdowns. Here\u2019s what to look for:<\/p><ul class=\"ul1\"><li class=\"li4\"><p><b>Dull or Matt Surface<\/b><\/p><\/li><\/ul><p class=\"p3\">Polished tungsten carbide should look mirror-like. When leaching begins, the surface becomes dull, often near the fluid edge.<\/p><ul class=\"ul1\"><li class=\"li4\"><p><b>Fine Pitting<\/b><\/p><\/li><\/ul><p class=\"p3\">Tiny pits or rough patches may appear under magnification. These are places where binder has been removed.<\/p><ul class=\"ul1\"><li class=\"li4\"><p><b>Increased Leakage<\/b><\/p><\/li><\/ul><p class=\"p3\">Once the surface loses flatness, leakage rises even under normal pressure.<\/p><ul class=\"ul1\"><li class=\"li4\"><p><b>Temperature Increase<\/b><\/p><\/li><\/ul><p class=\"p3\">A rougher surface increases friction, generating more heat\u2014often a warning sign before visible wear appears.<\/p><ul class=\"ul1\"><li class=\"li4\"><p><b>Surface Flaking<\/b><\/p><\/li><\/ul><p class=\"p3\">In advanced cases, the outer layer weakens and small flakes break off, exposing fresh carbide to attack.<\/p><ul class=\"ul1\"><li class=\"li4\"><p><b>Changes in Fluid Composition<\/b><\/p><\/li><\/ul><p class=\"p3\">Finding cobalt or nickel ions in the flush or process fluid is direct evidence of binder leaching.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1453868 e-flex e-con-boxed e-con e-parent\" data-id=\"1453868\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5d99f68 elementor-widget elementor-widget-text-editor\" data-id=\"5d99f68\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"p1\"><b>Example: Water Injection Pump in Offshore Platform<\/b><\/h2><p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-11917 size-full\" src=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-5.jpg\" alt=\"\" width=\"660\" height=\"440\" srcset=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-5.jpg 660w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-5-300x200.jpg 300w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-5-18x12.jpg 18w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p><p class=\"p3\">A water injection pump on an offshore oil platform suffered repeated mechanical seal failures.<\/p><p class=\"p3\">The seawater service, combined with occasional voltage potential between pump casing and motor frame, created electrochemical leaching of the cobalt binder.<\/p><p class=\"p3\">When engineers replaced the seal faces with nickel-bonded tungsten carbide and ensured proper grounding, the problem was eliminated.<\/p><p class=\"p3\">The new seals operated for more than three years without visible leaching.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-87c5946 e-flex e-con-boxed e-con e-parent\" data-id=\"87c5946\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5816978 elementor-widget elementor-widget-text-editor\" data-id=\"5816978\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"p1\"><b>How Leaching Affects Operations<\/b><\/h2><p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-11918 size-full\" src=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-6.jpg\" alt=\"\" width=\"660\" height=\"440\" srcset=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-6.jpg 660w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-6-300x200.jpg 300w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-6-18x12.jpg 18w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p><p class=\"p3\">For decision-makers, leaching is not just a material issue\u2014it impacts the entire operation:<\/p><ul class=\"ul1\"><li class=\"li3\"><p>Shortened seal life increases replacement cost.<\/p><\/li><li class=\"li3\"><p>Unexpected shutdowns reduce equipment availability.<\/p><\/li><li class=\"li3\"><p>Leakage and contamination can compromise product quality or safety.<\/p><\/li><li class=\"li3\"><p>Higher power consumption results from increased friction.<\/p><\/li><\/ul><p class=\"p3\">Each premature failure also adds indirect costs such as labor, downtime, and lost production.<\/p><p class=\"p3\">For large rotating equipment, preventing one seal failure can save tens of thousands of dollars.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d694db2 e-flex e-con-boxed e-con e-parent\" data-id=\"d694db2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bd86bf8 elementor-widget elementor-widget-text-editor\" data-id=\"bd86bf8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"p1\"><b>How to Prevent and Mitigate Leaching<\/b><\/h2><p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-11919 size-full\" src=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-7.jpg\" alt=\"\" width=\"660\" height=\"440\" srcset=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-7.jpg 660w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-7-300x200.jpg 300w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-7-18x12.jpg 18w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p><p class=\"p3\"><b>1). Choose the Right Material<\/b><\/p><p class=\"p4\">Select a grade that matches the fluid chemistry:<\/p><ul class=\"ul1\"><li class=\"li4\"><p>Nickel-bonded tungsten carbide for acidic or chloride-rich environments.<\/p><\/li><li class=\"li4\"><p>Cobalt-bonded for neutral, clean fluids where<a href=\"https:\/\/www.retopz.com\/ar\/toughness-in-the-tungsten-carbide-industry-a-comprehensive-definition\/\" target=\"_blank\" rel=\"noopener\"> \u0635\u0644\u0627\u0628\u0629<\/a> matters.<\/p><\/li><li class=\"li4\"><p>Binderless carbide for extremely aggressive fluids (though more brittle).<\/p><\/li><\/ul><p class=\"p3\"><b>2). Apply a Protective Coating<\/b><\/p><p class=\"p4\">Use thin films like:<\/p><ul class=\"ul1\"><li class=\"li4\"><p>DLC (\u0627\u0644\u0643\u0631\u0628\u0648\u0646 \u0627\u0644\u0634\u0628\u064a\u0647 \u0628\u0627\u0644\u0645\u0627\u0633)<\/p><\/li><li class=\"li4\"><p>CrN (Chromium Nitride)<\/p><\/li><li class=\"li4\"><p>TiN (\u0646\u064a\u062a\u0631\u064a\u062f \u0627\u0644\u062a\u064a\u062a\u0627\u0646\u064a\u0648\u0645)<\/p><\/li><\/ul><p class=\"p4\">These layers act as barriers and resist both corrosion and wear.<\/p><p class=\"p4\">\u0645\u062b\u0627\u0644:<\/p><p class=\"p4\">In fertilizer plants, adding a DLC coating to seal faces increased average life by 40%.<\/p><p class=\"p3\"><b>3). Control Temperature and Flow<\/b><\/p><p class=\"p4\">Ensure proper flushing or cooling. Install a clean flush line if process fluid is corrosive or contains solids. Avoid long idle periods with stagnant fluid on the seal.<\/p><p class=\"p3\"><b>4). Improve Fluid Quality<\/b><\/p><p class=\"p4\">Use inhibitors or filtration to remove ions and particulates that promote corrosion. Keep pH close to neutral when possible.<\/p><p class=\"p3\"><b>5). Electrical Isolation<\/b><\/p><p class=\"p4\">Use insulating sleeves or grounding brushes to prevent galvanic current paths between rotating and stationary parts.<\/p><p class=\"p3\"><b>6). Scheduled Inspection<\/b><\/p><p class=\"p4\">Regular inspection under a microscope can catch leaching early. Even small dull zones should prompt maintenance before they worsen.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b53bbc6 e-flex e-con-boxed e-con e-parent\" data-id=\"b53bbc6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8216d2e elementor-widget elementor-widget-text-editor\" data-id=\"8216d2e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"p1\"><b>Summary Table: Symptoms and Remedies<\/b><\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1ca0120 e-flex e-con-boxed e-con e-parent\" data-id=\"1ca0120\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4fd2ab9 elementor-widget elementor-widget-text-editor\" data-id=\"4fd2ab9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<table style=\"border-collapse: collapse; width:100%;\">\n  <tr style=\"background-color:#003366; color:white;\">\n    <th>Observed Symptom<\/th>\n    <th>Recommended Action<\/th>\n  <\/tr>\n    <td>Dull surface finish<\/td>\n    <td>Switch to nickel-bonded or coated grade<\/td>\n  <\/tr>\n    <td>Micro-pitting<\/td>\n    <td>Improve flush flow, reduce chemical concentration<\/td>\n  <\/tr>\n    <td>Increased leakage<\/td>\n    <td>Re-lap surface, apply barrier layer coating<\/td>\n  <\/tr>\n    <td>Flaking or chipping<\/td>\n    <td>Replace face, check temperature and load balance<\/td>\n  <\/tr>\n    <td>High temperature zone on face<\/td>\n    <td>Enhance cooling, verify alignment and pressure<\/td>\n  <\/tr>\n<\/table>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-50f01fc e-flex e-con-boxed e-con e-parent\" data-id=\"50f01fc\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ede63bb elementor-widget elementor-widget-text-editor\" data-id=\"ede63bb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"p1\"><b>Example: Pulp Mill Seal Upgrade<\/b><\/h2><p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-11920 size-full\" src=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-8.jpg\" alt=\"\" width=\"660\" height=\"440\" srcset=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-8.jpg 660w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-8-300x200.jpg 300w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-8-18x12.jpg 18w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p><p class=\"p3\">A pulp mill\u2019s pumps handling alkaline white water were suffering seal failures every four months.<\/p><p class=\"p3\">Post-failure inspection revealed cobalt leaching with shallow pits and dull rings.<\/p><p class=\"p3\">By changing to nickel-bonded tungsten carbide with a CrN coating, and improving the seal flush with a clean water loop, seal life was extended to 18 months.<\/p><p class=\"p3\">Maintenance costs dropped by 60%, and leakage issues were resolved.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-56d00d2 e-flex e-con-boxed e-con e-parent\" data-id=\"56d00d2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9232222 elementor-widget elementor-widget-text-editor\" data-id=\"9232222\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"p1\"><b>Key Takeaways for Decision Makers<\/b><\/h2><p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-11921 size-full\" src=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-9.jpg\" alt=\"\" width=\"660\" height=\"440\" srcset=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-9.jpg 660w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-9-300x200.jpg 300w, https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-9-18x12.jpg 18w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p><ul class=\"ul1\"><li class=\"li3\"><p>Leaching is a chemical corrosion problem, not just wear.<\/p><\/li><li class=\"li3\"><p>The main triggers are aggressive fluids, high heat, and poor material selection.<\/p><\/li><li class=\"li3\"><p>Early visual signs can save major repair costs if detected on time.<\/p><\/li><li class=\"li3\"><p>Proper material, coating, and flush design can prevent leaching completely.<\/p><\/li><li class=\"li3\"><p>Investing in prevention often saves much more than the cost of replacement parts.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2edaf38 e-flex e-con-boxed e-con e-parent\" data-id=\"2edaf38\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-07783bd elementor-widget elementor-widget-text-editor\" data-id=\"07783bd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"p1\"><b>\u062e\u0627\u062a\u0645\u0629<\/b><\/h2><p class=\"p2\">Leaching may not look dramatic at first, but once it starts, it steadily undermines seal reliability.<\/p><p class=\"p2\">With proper understanding, this problem can be eliminated through smart material selection, controlled operating conditions, and consistent monitoring.<\/p><p class=\"p2\">In short:<\/p><p class=\"p2\">Prevent leaching early\u2014don\u2019t repair it late. A few material and design upgrades today can save hundreds of maintenance hours tomorrow.<\/p><p class=\"p3\">\u0625\u0630\u0627 \u0643\u0646\u062a \u062a\u0631\u064a\u062f \u0645\u0639\u0631\u0641\u0629 \u0627\u0644\u0645\u0632\u064a\u062f \u0645\u0646 \u0627\u0644\u062a\u0641\u0627\u0635\u064a\u0644 \u062d\u0648\u0644 \u0623\u064a \u0634\u0631\u0643\u0629\u060c \u0641\u0644\u0627 \u062a\u062a\u0631\u062f\u062f \u0641\u064a <a href=\"https:\/\/www.retopz.com\/ar\/contact\/\" target=\"_blank\" rel=\"noopener\">\u0627\u062a\u0635\u0644 \u0628\u0646\u0627.<\/a> <span class=\"Apple-converted-space\">\u00a0 \u00a0<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Tungsten carbide seal faces are known for their excellent hardness and wear resistance. They are used in pumps, mixers, and compressors across industries such as chemical processing, oil and gas, and water treatment. Despite their toughness, these seal faces are not immune to all forms of damage. One issue that quietly develops in some applications [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":11913,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-11930","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-carbide-academy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.8 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Leaching in Tungsten Carbide Seal Faces<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.retopz.com\/ar\/leaching-in-tungsten-carbide-seal-faces-causes-symptoms-and-mitigation\/\" \/>\n<meta property=\"og:locale\" content=\"ar_AR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Leaching in Tungsten Carbide Seal Faces: Causes, Symptoms, and Mitigation\" \/>\n<meta property=\"og:description\" content=\"Tungsten carbide seal faces are known for their excellent hardness and wear resistance. They are used in pumps, mixers, and compressors across industries such as chemical processing, oil and gas, and water treatment. Despite their toughness, these seal faces are not immune to all forms of damage. One issue that quietly develops in some applications [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.retopz.com\/ar\/leaching-in-tungsten-carbide-seal-faces-causes-symptoms-and-mitigation\/\" \/>\n<meta property=\"og:site_name\" content=\"Retop Carbide\" \/>\n<meta property=\"article:published_time\" content=\"2025-10-10T07:06:54+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-10T07:53:33+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.retopz.com\/wp-content\/uploads\/2025\/10\/Leaching-in-Tungsten-Carbide-Seal-Faces-Causes-Symptoms-and-Mitigation-www.retopz.com-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"660\" \/>\n\t<meta property=\"og:image:height\" content=\"440\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"luo jing\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0643\u064f\u062a\u0628 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They are used in pumps, mixers, and compressors across industries such as chemical processing, oil and gas, and water treatment. Despite their toughness, these seal faces are not immune to all forms of damage. 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