{"id":4227,"date":"2026-01-27T05:25:57","date_gmt":"2026-01-27T05:25:57","guid":{"rendered":"https:\/\/bwmagnet.com\/?p=4227"},"modified":"2026-01-27T07:02:53","modified_gmt":"2026-01-27T07:02:53","slug":"magnet-coating-and-plating","status":"publish","type":"post","link":"https:\/\/www.bmagmagnet.com\/it\/magnet-coating-and-plating\/","title":{"rendered":"Trattamento superficiale dei magneti NdFeB: Rivestimento e placcatura del magnete"},"content":{"rendered":"<p class=\"wp-block-paragraph\">During the final manufacturing steps of neodymium magnets, the magnet coating and plating process is a critical stage. As an essential protective layer for high-performance magnets, it ensures long-term stability and reliability in demanding environments.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As established in material science, a coating is a covering applied to a substrate to improve surface properties such as corrosion resistance, wear resistance, or aesthetic appeal. For sintered Neodymium-Iron-Boron (NdFeB) magnets, this step\u2014often referred to as magnet coating or magnet plating\u2014is a fundamental necessity rather than an optional feature.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. Why NdFeB Magnets Require Coating\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Neodymium magnets are highly susceptible to environmental degradation due to two primary factors:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High Iron Content:<\/strong> Comprising approximately 64%\u201368% iron, the magnet is naturally prone to oxidation (rusting) in the presence of moisture.<\/li>\n\n\n\n<li><strong>The Nd-Rich Phase:<\/strong> The grain boundaries of the magnet consist of a Neodymium-rich phase that is chemically active. In humid conditions, this phase undergoes &#8220;intercrystalline corrosion,&#8221; where the grain boundaries oxidize, causing the magnet to eventually disintegrate into a fine powder.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The principle of <strong>NdFeB magnet coating<\/strong> is to provide a physical and chemical barrier between this reactive substrate and the external environment, preventing oxygen and moisture from initiating the corrosion process.<sup><\/sup><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><a href=\"https:\/\/bwmagnet.com\/wp-content\/uploads\/2025\/12\/Nickel-Plated-Arc-Magnets-Ni-Cu-Ni.webp\" target=\"_blank\" rel=\"noopener\"><img fetchpriority=\"high\" decoding=\"async\" width=\"400\" height=\"400\" src=\"https:\/\/bwmagnet.com\/wp-content\/uploads\/2025\/12\/Nickel-Plated-Arc-Magnets-Ni-Cu-Ni.webp\" alt=\"Magneti ad arco nichelati (Ni-Cu-Ni)\" class=\"wp-image-3019\" style=\"aspect-ratio:4\/3;object-fit:cover\" srcset=\"https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Nickel-Plated-Arc-Magnets-Ni-Cu-Ni.webp 400w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Nickel-Plated-Arc-Magnets-Ni-Cu-Ni-300x300.webp 300w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Nickel-Plated-Arc-Magnets-Ni-Cu-Ni-150x150.webp 150w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Nickel-Plated-Arc-Magnets-Ni-Cu-Ni-100x100.webp 100w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><figcaption class=\"wp-element-caption\">Magneti ad arco nichelati (Ni-Cu-Ni)<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">2. Principles of Neodymium Magnet Plating Protection<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">According to general coating principles, surface treatments for magnets work through three main mechanisms:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Barrier Protection:<\/strong> Coatings like Epoxy or Nickel create an impermeable shield that prevents corrosive agents from reaching the magnet surface.<\/li>\n\n\n\n<li><strong>Sacrificial Protection:<\/strong> Metallic coatings like Zinc act as a sacrificial anode. If the coating is scratched, the Zinc oxidizes first, protecting the underlying magnet through galvanic action.<\/li>\n\n\n\n<li><strong>Insulation and Biocompatibility:<\/strong> Specialized coatings like Teflon or Plastic provide chemical inertness, making the magnet suitable for medical or food-processing environments where magnets might react with the surroundings.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">3. Environmental Analysis and Magnet Coating Selection<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Scegliere il giusto <strong>magnet coating<\/strong> depends entirely on the application environment. At <strong>BMAG<\/strong>, we offer a comprehensive suite of treatments designed for specific industrial needs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A. Indoor and General Industrial Environments<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For applications in controlled indoor settings, such as sensors or consumer electronics, cost-efficiency and durability are the primary goals.<\/p>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-container-core-group-is-layout-f795cf24 wp-block-group-is-layout-constrained\" style=\"min-height:100px\"><div class=\"wp-block-group__inner-container\">\n<figure class=\"wp-block-gallery aligncenter has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/bwmagnet.com\/product\/nickel-plated-neodymium-block-magnet\/\" target=\"_blank\" rel=\" noreferrer noopener\"><img decoding=\"async\" width=\"300\" height=\"300\" data-id=\"2749\" src=\"https:\/\/bwmagnet.com\/wp-content\/uploads\/2025\/12\/Nickel-Plated-Block-Magnets-Ni-Cu-Ni.webp\" alt=\"Magneti a blocco nichelati (Ni-Cu-Ni)\" class=\"wp-image-2749\" style=\"object-fit:cover\" srcset=\"https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Nickel-Plated-Block-Magnets-Ni-Cu-Ni.webp 300w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Nickel-Plated-Block-Magnets-Ni-Cu-Ni-150x150.webp 150w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Nickel-Plated-Block-Magnets-Ni-Cu-Ni-100x100.webp 100w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><figcaption class=\"wp-element-caption\">Magneti a blocco nichelati (Ni-Cu-Ni)<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-style-default\" style=\"margin-top:0;margin-right:0;margin-bottom:0;margin-left:0\"><a href=\"https:\/\/bwmagnet.com\/product\/zinc-plated-neodymium-block-magnets\/\" target=\"_blank\" rel=\" noreferrer noopener\"><img decoding=\"async\" width=\"300\" height=\"300\" data-id=\"2753\" src=\"https:\/\/bwmagnet.com\/wp-content\/uploads\/2025\/12\/Zinc-Plated-Block-Magnets-Zn.webp\" alt=\"Magneti a blocco zincati (Zn)\" class=\"wp-image-2753\" srcset=\"https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Zinc-Plated-Block-Magnets-Zn.webp 300w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Zinc-Plated-Block-Magnets-Zn-150x150.webp 150w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Zinc-Plated-Block-Magnets-Zn-100x100.webp 100w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><figcaption class=\"wp-element-caption\">Magneti a blocco zincati (Zn)<\/figcaption><\/figure>\n<\/figure>\n<\/div><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ni-Cu-Ni (Nickel-Copper-Nickel) Magnet:<\/strong> This is the industry-standard <strong>magnet plating<\/strong>. The triple-layer structure (Nickel for corrosion resistance, Copper for ductility and adhesion, and a final Nickel layer for a bright finish) offers excellent protection for most indoor uses.<\/li>\n\n\n\n<li><strong>Zinc (Zn) Magne<strong>t<\/strong>:<\/strong> A highly cost-effective alternative. It is thinner than nickel and is ideal for magnets that will be glued or permanently embedded inside a protective housing.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">B. High-Humidity and Marine Environments<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Environments with high salinity or constant moisture require superior protective performance.<\/p>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-container-core-group-is-layout-17979c28 wp-block-group-is-layout-constrained\"><div class=\"wp-block-group__inner-container\">\n<figure class=\"wp-block-gallery aligncenter has-nested-images columns-default is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/bwmagnet.com\/product\/epoxy-coated-countersunk-magnet\/\" target=\"_blank\" rel=\" noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"400\" data-id=\"3031\" src=\"https:\/\/bwmagnet.com\/wp-content\/uploads\/2025\/12\/Epoxy-Coated-Countersunk-Magnets.webp\" alt=\"Magneti svasati con rivestimento epossidico\" class=\"wp-image-3031\" style=\"object-fit:contain\" srcset=\"https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Epoxy-Coated-Countersunk-Magnets.webp 400w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Epoxy-Coated-Countersunk-Magnets-300x300.webp 300w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Epoxy-Coated-Countersunk-Magnets-150x150.webp 150w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Epoxy-Coated-Countersunk-Magnets-100x100.webp 100w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><figcaption class=\"wp-element-caption\">Magneti svasati con rivestimento epossidico<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/bwmagnet.com\/product\/rubber-coated-neodymium-disc-magnet\/\" target=\"_blank\" rel=\" noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"400\" data-id=\"2491\" src=\"https:\/\/bwmagnet.com\/wp-content\/uploads\/2025\/12\/Rubber-Coated-Disc-Magnets.webp\" alt=\"Magneti a disco rivestiti in gomma\" class=\"wp-image-2491\" srcset=\"https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Rubber-Coated-Disc-Magnets.webp 400w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Rubber-Coated-Disc-Magnets-300x300.webp 300w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Rubber-Coated-Disc-Magnets-150x150.webp 150w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2025\/12\/Rubber-Coated-Disc-Magnets-100x100.webp 100w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><figcaption class=\"wp-element-caption\">Magneti a disco rivestiti in gomma<\/figcaption><\/figure>\n<\/figure>\n<\/div><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Epoxy (Black or Grey) <strong>Magnete<\/strong>:<\/strong> Epoxy is the best choice for saltwater or high-humidity environments. It provides superior salt spray resistance and acts as an electrical insulator.<\/li>\n\n\n\n<li><strong>Rubber Coating Magnet:<\/strong> This thick, durable coating makes the magnet completely waterproof. It also provides high friction to prevent sliding and protects the brittle magnet from breaking due to impact.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">C. Medical, Food, and Decorative Applications<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specialized industries require coatings that prioritize safety, chemical stability, or aesthetics.<sup><\/sup><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Teflon (PTFE)<strong> Magnete<\/strong>:<\/strong> Extremely stable and resistant to harsh chemicals, making it the gold standard for medical equipment or machinery in food processing.<\/li>\n\n\n\n<li><strong>Plastic (Polymer)<strong> Magnete<\/strong>:<\/strong> This ultra-thin, pinhole-free coating is biocompatible and offers outstanding protection against organic solvents without adding significant bulk.<\/li>\n\n\n\n<li><strong>Gold\/Silver<strong> Magnete<\/strong>:<\/strong> Used for medical devices due to biocompatibility or for high-end consumer products where a premium aesthetic is required.<\/li>\n\n\n\n<li><strong>Nichel nero<strong> Magnete<\/strong>:<\/strong> Provides a charcoal-like, non-reflective appearance, ideal for optical systems to minimize glare or for decorative hardware.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><a href=\"https:\/\/bwmagnet.com\/wp-content\/uploads\/2026\/01\/Coatings-for-NdFeB-Magnets-scaled.webp\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"128\" src=\"https:\/\/bwmagnet.com\/wp-content\/uploads\/2026\/01\/Coatings-for-NdFeB-Magnets-1024x128.webp\" alt=\"Rivestimenti per magneti NdFeB\" class=\"wp-image-4220\" srcset=\"https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2026\/01\/Coatings-for-NdFeB-Magnets-1024x128.webp 1024w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2026\/01\/Coatings-for-NdFeB-Magnets-300x38.webp 300w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2026\/01\/Coatings-for-NdFeB-Magnets-768x96.webp 768w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2026\/01\/Coatings-for-NdFeB-Magnets-1536x192.webp 1536w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2026\/01\/Coatings-for-NdFeB-Magnets-2048x257.webp 2048w, https:\/\/www.bmagmagnet.com\/wp-content\/uploads\/2026\/01\/Coatings-for-NdFeB-Magnets-600x75.webp 600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Rivestimenti per magneti NdFeB<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">4. The BMAG Advantage in Magnet Surface Treatment<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>BMAG<\/strong>, we treat the coating process with the same metallurgical rigor as the sintering phase. Every batch undergoes strict quality control, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Salt Spray Testing (SST):<\/strong> To verify the longevity of Epoxy and Nickel coatings in corrosive atmospheres.<\/li>\n\n\n\n<li><strong>Adhesion Testing:<\/strong> Ensuring the coating will not peel or flake under mechanical stress.<\/li>\n\n\n\n<li><strong>Thickness Verification:<\/strong> Utilizing X-ray fluorescence to confirm the coating meets the specified micron-level thickness without compromising dimensional tolerances.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusione<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The longevity and reliability of a Neodymium magnet are inseparable from its surface treatment.<sup><\/sup> By understanding the chemical principles of oxidation and the specific demands of the application environment, engineers can select a <strong>magnet coating<\/strong> that ensures the component performs for decades. Whether it is the sacrificial protection of Zinc or the chemical inertness of Teflon, <strong>BMAG<\/strong> provides the expertise needed to safeguard your &#8220;magnetic soul.&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Do you need a specific Salt Spray Test report for your project&#8217;s compliance? Contact the BMAG technical team today for a full coating performance datasheet.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>During the final manufacturing steps of neodymium magnets, the magnet coating and plating process is a critical stage. As an essential protective layer for high-performance magnets, it ensures long-term stability and reliability in demanding environments. As established in material science, a coating is a covering applied to a substrate to improve surface properties such as [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":4342,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":"","_bmag_faq_en_US":"","_bmag_faq_es_ES":"","_bmag_faq_fr_FR":"","_bmag_faq_de_DE":"","_bmag_faq_it_IT":"","_bmag_faq_pt_BR":"","_bmag_faq_ru_RU":"","_bmag_faq_nl_NL":"","_bmag_faq_ar":"","_bmag_faq":"","_bmag_howto":""},"categories":[1],"tags":[],"class_list":["post-4227","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"_links":{"self":[{"href":"https:\/\/www.bmagmagnet.com\/it\/wp-json\/wp\/v2\/posts\/4227","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bmagmagnet.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bmagmagnet.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bmagmagnet.com\/it\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bmagmagnet.com\/it\/wp-json\/wp\/v2\/comments?post=4227"}],"version-history":[{"count":7,"href":"https:\/\/www.bmagmagnet.com\/it\/wp-json\/wp\/v2\/posts\/4227\/revisions"}],"predecessor-version":[{"id":4380,"href":"https:\/\/www.bmagmagnet.com\/it\/wp-json\/wp\/v2\/posts\/4227\/revisions\/4380"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bmagmagnet.com\/it\/wp-json\/wp\/v2\/media\/4342"}],"wp:attachment":[{"href":"https:\/\/www.bmagmagnet.com\/it\/wp-json\/wp\/v2\/media?parent=4227"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bmagmagnet.com\/it\/wp-json\/wp\/v2\/categories?post=4227"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bmagmagnet.com\/it\/wp-json\/wp\/v2\/tags?post=4227"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}