{"id":6707,"date":"2026-04-13T13:52:20","date_gmt":"2026-04-13T11:52:20","guid":{"rendered":"https:\/\/www.dueemmesidol.it\/?page_id=6707"},"modified":"2026-04-13T14:31:24","modified_gmt":"2026-04-13T12:31:24","slug":"fastener-protective-coatings","status":"publish","type":"page","link":"https:\/\/www.dueemmesidol.it\/it\/fastener-protective-coatings\/","title":{"rendered":"Protective coatings for industrial fasteners"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"6707\" class=\"elementor elementor-6707\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-14149eb e-con-full e-flex e-con e-parent\" data-id=\"14149eb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a3ddff5 elementor-widget elementor-widget-heading\" data-id=\"a3ddff5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Protective coatings for industrial fasteners<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a7880c3 elementor-widget elementor-widget-text-editor\" data-id=\"a7880c3\" 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 style=\"text-align: center;\"><span style=\"color: #808080;\">A quick comparison of the most common protective coatings used for industrial fasteners, based on corrosion resistance, application and technical characteristics.nt.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c3066a5 e-flex e-con-boxed e-con e-parent\" data-id=\"c3066a5\" 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-bfa7f84 elementor-widget elementor-widget-heading\" data-id=\"bfa7f84\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How to choose the right coating<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62a6f23 elementor-widget elementor-widget-text-editor\" data-id=\"62a6f23\" 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 style=\"text-align: center;\" data-start=\"862\" data-end=\"1048\">The selection of a protective coating is not based only on corrosion resistance.<br data-start=\"942\" data-end=\"945\" \/>Friction behavior, assembly requirements and compliance with specifications are often equally critical.<\/p><p style=\"text-align: center;\" data-start=\"1050\" data-end=\"1074\">Typical selection logic:<\/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-629f157 e-con-full e-flex e-con e-parent\" data-id=\"629f157\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-42b0108 e-con-full e-flex e-con e-child\" data-id=\"42b0108\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-25122c7 elementor-widget elementor-widget-heading\" data-id=\"25122c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Indoor \/ low exposure \u2192\n\nZinc plating<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b79a6cb e-con-full e-flex e-con e-child\" data-id=\"b79a6cb\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4cd9469 elementor-widget elementor-widget-heading\" data-id=\"4cd9469\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Automotive \/ controlled tightening \u2192 Zinc flake + topcoat<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a81d518 e-con-full e-flex e-con e-child\" data-id=\"a81d518\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4136fb8 elementor-widget elementor-widget-heading\" data-id=\"4136fb8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Outdoor \/ structural \u2192 Hot dip galvanizing<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-657abf1 e-con-full e-flex e-con e-child\" data-id=\"657abf1\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-12e47a7 elementor-widget elementor-widget-heading\" data-id=\"12e47a7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Aesthetic \/ low protection \u2192 Black oxide<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8dbc6f0 e-con-full e-flex e-con e-parent\" data-id=\"8dbc6f0\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d7313c1 elementor-widget elementor-widget-html\" data-id=\"d7313c1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"dm-surface-treatments\">\r\n  <style>\r\n    .dm-surface-treatments {\r\n      font-family: Inter, Arial, sans-serif;\r\n      color: #222;\r\n    }\r\n\r\n    .dm-filters {\r\n      display: grid;\r\n      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));\r\n      gap: 12px;\r\n      margin-bottom: 20px;\r\n    }\r\n\r\n    .dm-filters input,\r\n    .dm-filters select {\r\n      width: 100%;\r\n      padding: 10px 12px;\r\n      border: 1px solid #d6d6d6;\r\n      border-radius: 6px;\r\n      font-size: 14px;\r\n      background: #fff;\r\n    }\r\n\r\n    .dm-table-wrap {\r\n      width: 100%;\r\n      overflow-x: auto;\r\n    }\r\n\r\n    .dm-table {\r\n      width: 100%;\r\n      border-collapse: collapse;\r\n      min-width: 1100px;\r\n      font-size: 14px;\r\n    }\r\n\r\n    .dm-table th,\r\n    .dm-table td {\r\n      padding: 12px 14px;\r\n      border: 1px solid #e5e5e5;\r\n      text-align: left;\r\n      vertical-align: top;\r\n    }\r\n\r\n    .dm-table th {\r\n      background: #f7f7f7;\r\n      font-weight: 600;\r\n      white-space: nowrap;\r\n    }\r\n\r\n    .dm-table tr:nth-child(even) {\r\n      background: #fcfcfc;\r\n    }\r\n\r\n    .dm-tag {\r\n      display: inline-block;\r\n      padding: 4px 8px;\r\n      border-radius: 20px;\r\n      font-size: 12px;\r\n      line-height: 1.2;\r\n      background: #f0f0f0;\r\n      white-space: nowrap;\r\n    }\r\n\r\n    .dm-note {\r\n      margin-top: 18px;\r\n      font-size: 13px;\r\n      line-height: 1.6;\r\n      color: #555;\r\n    }\r\n\r\n    .dm-no-results {\r\n      display: none;\r\n      margin-top: 16px;\r\n      padding: 12px;\r\n      border: 1px solid #e5e5e5;\r\n      background: #fafafa;\r\n      border-radius: 6px;\r\n      font-size: 14px;\r\n      color: #444;\r\n    }\r\n\r\n    .dm-reset {\r\n      padding: 10px 14px;\r\n      border: 1px solid #222;\r\n      background: #fff;\r\n      color: #222;\r\n      border-radius: 6px;\r\n      cursor: pointer;\r\n      font-size: 14px;\r\n    }\r\n\r\n    .dm-reset:hover {\r\n      background: #f5f5f5;\r\n    }\r\n  <\/style>\r\n\r\n  <div class=\"dm-filters\">\r\n    <input type=\"text\" id=\"dmSearch\" placeholder=\"Search treatment or notes...\">\r\n\r\n    <select id=\"dmCorrosion\">\r\n      <option value=\"\">Corrosion resistance<\/option>\r\n      <option value=\"low\">Below 300h<\/option>\r\n      <option value=\"medium\">300h\u2013800h<\/option>\r\n      <option value=\"high\">Above 800h<\/option>\r\n    <\/select>\r\n\r\n    <select id=\"dmFriction\">\r\n      <option value=\"\">Friction control<\/option>\r\n      <option value=\"yes\">Yes<\/option>\r\n      <option value=\"no\">No<\/option>\r\n      <option value=\"optional\">Optional<\/option>\r\n    <\/select>\r\n\r\n    <select id=\"dmHydrogen\">\r\n      <option value=\"\">Hydrogen risk<\/option>\r\n      <option value=\"yes\">Yes \/ Risk<\/option>\r\n      <option value=\"low\">Low<\/option>\r\n      <option value=\"no\">No<\/option>\r\n    <\/select>\r\n\r\n    <select id=\"dmLimits\">\r\n      <option value=\"\">Application limits<\/option>\r\n      <option value=\"no\">No<\/option>\r\n      <option value=\"yes\">Yes<\/option>\r\n    <\/select>\r\n\r\n    <button type=\"button\" class=\"dm-reset\" id=\"dmReset\">Reset filters<\/button>\r\n  <\/div>\r\n\r\n  <div class=\"dm-table-wrap\">\r\n    <table class=\"dm-table\" id=\"dmTreatmentsTable\">\r\n      <thead>\r\n        <tr>\r\n          <th>Surface Treatment<\/th>\r\n          <th>White Rust (hrs)<\/th>\r\n          <th>Red Rust (hrs)<\/th>\r\n          <th>Friction Control<\/th>\r\n          <th>Hydrogen Embrittlement<\/th>\r\n          <th>Application Limits<\/th>\r\n          <th>Notes<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr data-corrosion=\"low\" data-friction=\"no\" data-hydrogen=\"yes\" data-limits=\"no\">\r\n          <td>Zinc Plating (Clear)<\/td>\r\n          <td>24\u201372<\/td>\r\n          <td>120\u2013240<\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">Risk (\u226510.9)<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td>Requires dehydrogenation for high strength fasteners.<\/td>\r\n        <\/tr>\r\n\r\n        <tr data-corrosion=\"medium\" data-friction=\"no\" data-hydrogen=\"yes\" data-limits=\"no\">\r\n          <td>Zinc Plating (Yellow)<\/td>\r\n          <td>72\u2013120<\/td>\r\n          <td>200\u2013400<\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">Risk (\u226510.9)<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td>Improved corrosion resistance compared to clear zinc. Dehydrogenation required for high strength fasteners.<\/td>\r\n        <\/tr>\r\n\r\n        <tr data-corrosion=\"high\" data-friction=\"optional\" data-hydrogen=\"low\" data-limits=\"no\">\r\n          <td>Zinc-Nickel<\/td>\r\n          <td>120\u2013240<\/td>\r\n          <td>500\u20131000+<\/td>\r\n          <td><span class=\"dm-tag\">Optional<\/span><\/td>\r\n          <td><span class=\"dm-tag\">Low<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td>High corrosion resistance, commonly used for automotive applications.<\/td>\r\n        <\/tr>\r\n\r\n        <tr data-corrosion=\"medium\" data-friction=\"no\" data-hydrogen=\"no\" data-limits=\"no\">\r\n          <td>GEOMET\u00ae 321 (Basecoat)<\/td>\r\n          <td>\u2014<\/td>\r\n          <td>600\u2013800<\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td>Standard zinc flake coating. No hydrogen embrittlement risk.<\/td>\r\n        <\/tr>\r\n\r\n        <tr data-corrosion=\"high\" data-friction=\"yes\" data-hydrogen=\"no\" data-limits=\"no\">\r\n          <td>GEOMET\u00ae 321 + Topcoat<\/td>\r\n          <td>\u2014<\/td>\r\n          <td>720\u20131000+<\/td>\r\n          <td><span class=\"dm-tag\">Yes<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td>Controlled friction system. Typical friction range: 0.06\u20130.18 depending on topcoat.<\/td>\r\n        <\/tr>\r\n\r\n        <tr data-corrosion=\"high\" data-friction=\"yes\" data-hydrogen=\"no\" data-limits=\"no\">\r\n          <td>GEOMET\u00ae 500<\/td>\r\n          <td>&gt;240 without white rust<\/td>\r\n          <td>720\u20131000+<\/td>\r\n          <td><span class=\"dm-tag\">Yes<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td>Integrated lubricant. Typical friction coefficient: 0.15 \u00b1 0.03.<\/td>\r\n        <\/tr>\r\n\r\n        <tr data-corrosion=\"high\" data-friction=\"yes\" data-hydrogen=\"no\" data-limits=\"no\">\r\n          <td>GEOMET\u00ae + Topcoat (PLUS\u00ae, GEOKOTE\u00ae)<\/td>\r\n          <td>\u2014<\/td>\r\n          <td>1000\u20131500+<\/td>\r\n          <td><span class=\"dm-tag\">Yes<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td>High-performance zinc flake systems with improved friction control and corrosion resistance.<\/td>\r\n        <\/tr>\r\n\r\n        <tr data-corrosion=\"high\" data-friction=\"yes\" data-hydrogen=\"no\" data-limits=\"no\">\r\n          <td>GEOBLACK\u00ae<\/td>\r\n          <td>\u2014<\/td>\r\n          <td>Up to 1000<\/td>\r\n          <td><span class=\"dm-tag\">Yes<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td>Black zinc flake system combining corrosion protection with aesthetic appearance.<\/td>\r\n        <\/tr>\r\n\r\n        <tr data-corrosion=\"high\" data-friction=\"no\" data-hydrogen=\"no\" data-limits=\"yes\">\r\n          <td>Hot Dip Galvanized<\/td>\r\n          <td>\u2014<\/td>\r\n          <td>500\u20131500+<\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">Yes<\/span><\/td>\r\n          <td>Not recommended for small diameters or fine threads due to coating thickness and thread fit issues.<\/td>\r\n        <\/tr>\r\n\r\n        <tr data-corrosion=\"low\" data-friction=\"no\" data-hydrogen=\"no\" data-limits=\"no\">\r\n          <td>Phosphated (Oiled)<\/td>\r\n          <td>\u2014<\/td>\r\n          <td>24\u201396<\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td>Temporary protection, typically used as a base or for indoor applications.<\/td>\r\n        <\/tr>\r\n\r\n        <tr data-corrosion=\"low\" data-friction=\"no\" data-hydrogen=\"no\" data-limits=\"no\">\r\n          <td>Black Oxide (Oiled)<\/td>\r\n          <td>\u2014<\/td>\r\n          <td>24\u201372<\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td><span class=\"dm-tag\">No<\/span><\/td>\r\n          <td>Minimal corrosion resistance, mainly chosen for appearance or light indoor use.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"dm-no-results\" id=\"dmNoResults\">\r\n    No treatments match the selected filters.\r\n  <\/div>\r\n\r\n  <div class=\"dm-note\">\r\n    <p>Salt spray test values are indicative and may vary depending on coating thickness, process parameters and part geometry.<\/p>\r\n    <p>Friction values may vary depending on lubrication systems and assembly conditions.<\/p>\r\n    <p>Electroplated zinc coatings may introduce hydrogen into the material. For high strength fasteners (\u2265 10.9), a controlled dehydrogenation process after plating is required to reduce the risk of brittle failure.<\/p>\r\n  <\/div>\r\n\r\n  <script>\r\n    (function () {\r\n      const searchInput = document.getElementById('dmSearch');\r\n      const corrosionFilter = document.getElementById('dmCorrosion');\r\n      const frictionFilter = document.getElementById('dmFriction');\r\n      const hydrogenFilter = document.getElementById('dmHydrogen');\r\n      const limitsFilter = document.getElementById('dmLimits');\r\n      const resetButton = document.getElementById('dmReset');\r\n      const table = document.getElementById('dmTreatmentsTable');\r\n      const rows = table.querySelectorAll('tbody tr');\r\n      const noResults = document.getElementById('dmNoResults');\r\n\r\n      function filterTable() {\r\n        const searchValue = searchInput.value.toLowerCase().trim();\r\n        const corrosionValue = corrosionFilter.value;\r\n        const frictionValue = frictionFilter.value;\r\n        const hydrogenValue = hydrogenFilter.value;\r\n        const limitsValue = limitsFilter.value;\r\n\r\n        let visibleCount = 0;\r\n\r\n        rows.forEach((row) => {\r\n          const text = row.innerText.toLowerCase();\r\n          const corrosion = row.getAttribute('data-corrosion');\r\n          const friction = row.getAttribute('data-friction');\r\n          const hydrogen = row.getAttribute('data-hydrogen');\r\n          const limits = row.getAttribute('data-limits');\r\n\r\n          const matchesSearch = !searchValue || text.includes(searchValue);\r\n          const matchesCorrosion = !corrosionValue || corrosion === corrosionValue;\r\n          const matchesFriction = !frictionValue || friction === frictionValue;\r\n          const matchesHydrogen = !hydrogenValue || hydrogen === hydrogenValue;\r\n          const matchesLimits = !limitsValue || limits === limitsValue;\r\n\r\n          if (matchesSearch && matchesCorrosion && matchesFriction && matchesHydrogen && matchesLimits) {\r\n            row.style.display = '';\r\n            visibleCount++;\r\n          } else {\r\n            row.style.display = 'none';\r\n          }\r\n        });\r\n\r\n        noResults.style.display = visibleCount === 0 ? 'block' : 'none';\r\n      }\r\n\r\n      searchInput.addEventListener('input', filterTable);\r\n      corrosionFilter.addEventListener('change', filterTable);\r\n      frictionFilter.addEventListener('change', filterTable);\r\n      hydrogenFilter.addEventListener('change', filterTable);\r\n      limitsFilter.addEventListener('change', filterTable);\r\n\r\n      resetButton.addEventListener('click', function () {\r\n        searchInput.value = '';\r\n        corrosionFilter.value = '';\r\n        frictionFilter.value = '';\r\n        hydrogenFilter.value = '';\r\n        limitsFilter.value = '';\r\n        filterTable();\r\n      });\r\n\r\n      filterTable();\r\n    })();\r\n  <\/script>\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Protective coatings for industrial fasteners A quick comparison of the most common protective coatings used for industrial fasteners, based on corrosion resistance, application and technical characteristics.nt. How to choose the right coating The selection of a protective coating is not based only on corrosion resistance.Friction behavior, assembly requirements and compliance with specifications are often equally [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":6699,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-6707","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Protective Coatings for Fasteners and Corrosion Protection<\/title>\n<meta name=\"description\" content=\"Protective coatings for industrial fasteners. 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