{"id":11623,"date":"2023-09-05T10:26:48","date_gmt":"2023-09-05T10:26:48","guid":{"rendered":"https:\/\/xometry.pro\/articles\/anodizing-aluminium\/"},"modified":"2025-05-22T17:55:28","modified_gmt":"2025-05-22T15:55:28","slug":"anodising-aluminium","status":"publish","type":"articles","link":"https:\/\/xometry.pro\/en-uk\/articles\/anodising-aluminium\/","title":{"rendered":"Anodising Aluminium: An Effective Finishing for Corrosion Resistance"},"content":{"rendered":"<div role=\"navigation\" aria-label=\"Table of Contents\" class=\"simpletoc wp-block-simpletoc-toc\"><h2 class=\"simpletoc-title\">Table of Contents<\/h2>\n<ul class=\"simpletoc-list\">\n<li><a href=\"#h-how-does-aluminum-anodising-work\">How Does Aluminum Anodising Work?<\/a>\n\n<\/li>\n<li><a href=\"#what-are-the-different-types-of-anodising\">What Are the Different Types of Anodising?<\/a>\n\n\n<\/li>\n\n<\/li>\n\n<li><a href=\"#h-type-ii-vs-type-iii-anodising\">Type II vs. Type III Anodising<\/a>\n\n<\/li>\n<li><a href=\"#h-materials-used-for-anodising\">Materials Used for Anodising<\/a>\n\n<\/li>\n<li><a href=\"#h-benefits-of-anodising-aluminium\">Benefits of Anodising Aluminium<\/a>\n\n<\/li>\n<li><a href=\"#h-anodising-aluminium-in-different-colours\">Anodising Aluminium in Different Colours<\/a>\n\n\n<\/li>\n\n<\/li>\n\n<li><a href=\"#h-get-anodised-aluminium-parts-with-xometry\">Get Anodised Aluminium Parts with Xometry<\/a>\n<\/li><\/ul><\/div>\n\n\n<p>Anodising is a post-processing operation used for finishing. It is a conversion coating method that converts the surface of aluminium, and other compatible metals, to their oxides. This electrochemical process increases the thickness of the oxide layer that occurs naturally on the surface of metallic parts.&nbsp;<\/p>\n\n\n\n<p>Unlike painting which adds a superficial layer to the material, the anodising process fully integrates the oxide layer with the underlying material, thus preventing it from peeling. This layer is a highly ordered and quite porous structure that allows other subsequent processes like colouring and sealing. The ideal material for anodising is aluminium. However, other metals such as magnesium and titanium can be anodised.<\/p>\n\n\n\n<p>Anodising is commonly carried out as a finishing process on parts made from CNC machining and sheet metal fabrication. It is a simple yet effective process that enhances the durability, wear resistance, hardness, and corrosion resistance of a part. It also improves aesthetics as it creates a shiny surface finish, with the option of colour, on parts.<\/p>\n\n\n<div id=\"LBLV1CPBRRk-69ddfc27d9210\" data-video-id=\"LBLV1CPBRRk\" class=\"ma-gdpr-youtube-wrapper\" style=\"width:100%;height:56.25%;padding-top:56.25%;\" data-new-window=\"\" data-yt-parameters=\"WyJtYXgtd2lkdGg9XHUyMDFjNjAwcHhcIiJd\"><picture class=\"ma-gdpr-youtube-thumbnail\"><source media=\"(min-width:640px)\" type=\"image\/webp\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/LBLV1CPBRRk\/LBLV1CPBRRk_hq720.webp\"><source media=\"(min-width:640px)\" type=\"image\/jpeg\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/LBLV1CPBRRk\/LBLV1CPBRRk_hq720.jpg\"><source media=\"(min-width:320px)\" type=\"image\/webp\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/LBLV1CPBRRk\/LBLV1CPBRRk_sddefault.webp\"><source media=\"(min-width:320px)\" type=\"image\/jpeg\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/LBLV1CPBRRk\/LBLV1CPBRRk_sddefault.jpg\"><source media=\"(min-width:240px)\" type=\"image\/webp\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/LBLV1CPBRRk\/LBLV1CPBRRk_hqdefault.webp\"><source media=\"(min-width:240px)\" type=\"image\/jpeg\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/LBLV1CPBRRk\/LBLV1CPBRRk_hqdefault.jpg\"><img decoding=\"async\" src=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/LBLV1CPBRRk\/LBLV1CPBRRk_mqdefault.jpg\" alt=\"\" title=\"\"><\/picture><svg class=\"ma-gdpr-youtube-button\"><use xlink:href=\"#ma-gdpr-youtube-play-button\"><\/use><\/svg><div class=\"ma-gdpr-youtube-notice\" style=\"font-size:.7em;\"><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-does-aluminum-anodising-work\"><strong>How Does Aluminum Anodising Work?<\/strong><\/h2>\n\n\n<p>Anodising is carried out using the <a href=\"https:\/\/chem.libretexts.org\/Bookshelves\/Analytical_Chemistry\/Supplemental_Modules_(Analytical_Chemistry)\/Electrochemistry\/Electrolytic_Cells\" target=\"_blank\" rel=\"noreferrer noopener\">electrolytic cell<\/a> electrochemical process. The aluminium to be anodised is thoroughly cleaned to remove impurities and immersed in an acid electrolyte bath. The cathode is mounted inside the anodising tank. The immersed aluminium becomes the aluminium anode.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>As direct electric current is passed between the anode and the cathode, oxygen ions released from the electrolytic bath migrate towards the aluminium and combine with atoms of the aluminium to form aluminium oxide. As a result, an anodic layer creating an oxide barrier is formed on the surface of the part.<\/p>\n\n\n\n<p>This process changes the microscopic texture of the metal surface and the crystalline structure of the parent metal near the surface. Titanium racks and lead cathodes are the most ubiquitous cathodes for anodising aluminium.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"648\" height=\"654\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/A-simple-electrolytic-cell.png\" alt=\"A simple electrolytic cell\" class=\"wp-image-1706\" style=\"max-width:323px;max-height:326px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/A-simple-electrolytic-cell.png 648w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/A-simple-electrolytic-cell-297x300.png 297w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/A-simple-electrolytic-cell-150x150.png 150w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/A-simple-electrolytic-cell-84x84.png 84w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/A-simple-electrolytic-cell-102x102.png 102w\" sizes=\"(max-width: 648px) 100vw, 648px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/A-simple-electrolytic-cell.png\" data-fancybox=\"gallery-11623\" data-caption=\"A simple electrolytic cell\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/A-simple-electrolytic-cell.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">A simple electrolytic cell<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"what-are-the-different-types-of-anodising\"><strong>What Are the Different Types of Anodising?<\/strong><\/h2>\n\n\n<p>There are three types of anodising that differ by electrolytic fluid:<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"h-type-i-anodising-chromic-acid-anodising\"><strong>Type I Anodising: Chromic Acid Anodising<\/strong><\/h3>\n\n\n<p>In Type I, the electrolyte is chromic acid-based. Anodising with chromic acid forms a thin coating (the thickness depends on the process) and provides the least colour absorption during dyeing. This type is not commonly used as it offers not-so-great wear resistance and low porosity.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"h-type-ii-anodising-nbsp-sulfuric-acid-anodising-nbsp\"><strong>Type II Anodising:  Sulfuric Acid Anodising <\/strong><\/h3>\n\n\n<p>Type II anodising uses a dilute sulfuric acid to create a thicker oxide layer of approximately 8 to 13 \u00b5m and has better colour absorption. It has good corrosion resistance and wear resistance.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"h-type-iii-anodising-hard-anodising\"><strong>Type III Anodising: Hard Anodising<\/strong><\/h3>\n\n\n<p>Type III is carried out using sulfuric acid, albeit at much lower temperatures. Hard anodising gives thicknesses in the range of 40 to 60 \u00b5m, the highest of the three types. Hard anodised aluminium parts are corrosion-resistant with excellent resistance to wear, and their layers have the highest porosity.&nbsp;<\/p>\n\n\n\n<p>A different kind of anodising commonly referred to as architectural anodising makes use of metallic ions.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-part-with-a-black-hardcoat-anodising-finish-1024x683.jpg\" alt=\"CNC machined part with a black hardcoat anodising finish\" class=\"wp-image-1707\" style=\"max-width:547px;max-height:365px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-part-with-a-black-hardcoat-anodising-finish-1024x683.jpg 1024w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-part-with-a-black-hardcoat-anodising-finish-300x200.jpg 300w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-part-with-a-black-hardcoat-anodising-finish-768x512.jpg 768w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-part-with-a-black-hardcoat-anodising-finish.jpg 1440w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-part-with-a-black-hardcoat-anodising-finish.jpg\" data-fancybox=\"gallery-11623\" data-caption=\"CNC machined part with a black hardcoat anodising finish\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-part-with-a-black-hardcoat-anodising-finish.jpg\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">CNC machined part with a black hardcoat anodising finish<\/figcaption><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-type-ii-vs-type-iii-anodising\"><strong>Type II vs. Type III Anodising<\/strong><\/h2>\n\n\n<p>The major difference between Type II and Type III anodising is the thickness of the oxide layer. The anodised oxide layer created by Type II anodising is much thinner than that of Type III.<\/p>\n\n\n\n<p>Type II anodised parts are great for cosmetic finishing, as they provide a smooth, attractive finish along with good resistance to corrosion and wear. However, if you need matte finished anodised aluminium parts, you need to bead blast the as-machined part before anodising. Type II is also best for implementing different permanent pigments into the anodised parts to get the desired colour finish.<\/p>\n\n\n\n<p>On the other hand, type III (hard) anodising is suitable for parts that need to remain functional in harsh environments, such as aerospace and automotive components. Parts that need excellent scratch resistance and greater thermal shock resistance and durability prefer Type III hard anodising over Type II anodising.<\/p>\n\n\n<div class=\"custom-table-block \" id=\"table-id-896\" >\r\n\t<div class=\"search-input-wrapper\">\r\n\t\t<svg width=\"16\" height=\"16\" viewBox=\"0 0 16 16\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\r\n\t\t\t<path d=\"M15.7812 13.833L12.6659 10.7177C12.5252 10.5771 12.3346 10.499 12.1347 10.499H11.6253C12.4877 9.39596 13.0002 8.00859 13.0002 6.49937C13.0002 2.90909 10.0911 0 6.50083 0C2.91056 0 0.00146484 2.90909 0.00146484 6.49937C0.00146484 10.0896 2.91056 12.9987 6.50083 12.9987C8.01006 12.9987 9.39742 12.4863 10.5004 11.6239V12.1332C10.5004 12.3332 10.5786 12.5238 10.7192 12.6644L13.8345 15.7797C14.1282 16.0734 14.6032 16.0734 14.8938 15.7797L15.778 14.8954C16.0718 14.6017 16.0718 14.1267 15.7812 13.833ZM6.50083 10.499C4.29167 10.499 2.50122 8.71165 2.50122 6.49937C2.50122 4.29021 4.28855 2.49976 6.50083 2.49976C8.70999 2.49976 10.5004 4.28708 10.5004 6.49937C10.5004 8.70852 8.71311 10.499 6.50083 10.499Z\" fill=\"#476175\"\/>\r\n\t\t<\/svg>\r\n\t\t<input type=\"search\" class=\"table-search-input\" id=\"table-search-896\" placeholder=\"Table search\">\r\n\t<\/div>\t\r\n\t<div class=\"table-wrapper\">\r\n\t\t<table style=\"border-collapse: collapse; width: 100%; height: 120px;\">\n<tbody>\n<tr>\n<td style=\"width: 17.5258%;\"><b>Feature<\/b><\/td>\n<td style=\"width: 37.3711%;\"><b>Type II anodising<\/b><\/td>\n<td style=\"width: 44.9742%;\"><b>Type III hard anodising<\/b><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 17.5258%;\"><span style=\"font-weight: 400;\">Oxide layer<\/span><\/td>\n<td style=\"width: 37.3711%;\"><span style=\"font-weight: 400;\">Thin (8 to 13 \u00b5m)<\/span><\/td>\n<td style=\"width: 44.9742%;\"><span style=\"font-weight: 400;\">Thick and dense oxide layer (40 to 60 \u00b5m)<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 17.5258%;\"><span style=\"font-weight: 400;\">Surface finish<\/span><\/td>\n<td style=\"width: 37.3711%;\"><span style=\"font-weight: 400;\">Smooth finish<\/span><\/td>\n<td style=\"width: 44.9742%;\"><span style=\"font-weight: 400;\">Matte<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 17.5258%;\"><span style=\"font-weight: 400;\">Part\u2019s properties<\/span><\/td>\n<td style=\"width: 37.3711%;\"><span style=\"font-weight: 400;\">Good corrosion and wear resistance<\/span><\/td>\n<td style=\"width: 44.9742%;\"><span style=\"font-weight: 400;\">Excellent scratch resistance, highly durable<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 17.5258%;\"><span style=\"font-weight: 400;\">Appearance<\/span><\/td>\n<td style=\"width: 37.3711%;\"><span style=\"font-weight: 400;\">Slightly yellowish<\/span><\/td>\n<td style=\"width: 44.9742%;\"><span style=\"font-weight: 400;\">Brownish<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 17.5258%;\"><span style=\"font-weight: 400;\">Cost<\/span><\/td>\n<td style=\"width: 37.3711%;\"><span style=\"font-weight: 400;\">More cost-effective<\/span><\/td>\n<td style=\"width: 44.9742%;\"><span style=\"font-weight: 400;\">Higher cost due to thicker oxide layer<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\t<\/div>\r\n<\/div>\r\n<style>\r\n\t.custom-table-block table{\r\n\t\theight: initial!important;\r\n\t}\r\n\t.search-input-wrapper{\r\n\t\tposition: relative;\r\n\t\tmargin-bottom: 24px;\r\n\t}\r\n\t.search-input-wrapper svg{\r\n\t\tposition: absolute;\r\n\t\ttop:50%;\r\n\t\tleft:12px;\r\n\t\ttransform: translateY(-50%);\r\n\t}\r\n\t.table-search-input{\r\n\t\tpadding: 0 0 0 40px;\r\n\t\tborder:1px solid #C1CAD1;\r\n\t\theight: 44px;\r\n\t\twidth: 201px;\r\n\t\tcolor:#092C47;\r\n\t\tfont-family: Open Sans;\r\n\t\tfont-size: 16px;\r\n\t\tfont-weight: 400;\r\n\t\tline-height: 24px;\r\n\t\tletter-spacing: 0em;\r\n\t\ttext-align: left;\r\n\t}\r\n\t.table-search-input::placeholder{\r\n\t\tcolor:#092C47;\r\n\t}\r\n\t\r\n\t.custom-table-block thead 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inline-block;\r\n\t\tbackground-image: url(\"data:image\/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http:\/\/www.w3.org\/2000\/svg'%3E%3Cpath d='M10.585 0.585938L6 5.17094L1.415 0.585938L0 2.00094L6 8.00094L12 2.00094L10.585 0.585938Z' fill='%23476175'\/%3E%3C\/svg%3E%0A\");\r\n\t\tmargin-left: 8px;\r\n\t\tbackground-position: center center;\r\n\t\tbackground-size: 12px 7.5px;\r\n\t\tbackground-repeat: no-repeat;\r\n\t\twidth: 24px;\r\n\t\theight: 12px;\r\n\t}\r\n\t.custom-table-block{\r\n\t\tmargin: 20px 0;\t\r\n\t}\r\n\t.custom-table-block .table-wrapper{\r\n\t\twidth: 100%;\r\n\t\toverflow-x: auto;\r\n\t}\r\n\t@media(max-width: 768px){\r\n\t\t\/* .custom-table-block tbody td{\r\n\t\t\twhite-space: nowrap;\r\n\t\t} *\/\r\n\t\t.custom-table-block .table-wrapper{\r\n\t\t\tmax-width: calc(100vw - 16px);\r\n\t\t}\r\n\t}\r\n<\/style>\r\n\n\n<div id=\"nCIsL5E7Q60-69ddfc27da77d\" data-video-id=\"nCIsL5E7Q60\" class=\"ma-gdpr-youtube-wrapper\" style=\"width:100%;height:56.25%;padding-top:56.25%;\" data-new-window=\"\" data-yt-parameters=\"\"><picture class=\"ma-gdpr-youtube-thumbnail\"><source media=\"(min-width:640px)\" type=\"image\/webp\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/nCIsL5E7Q60\/nCIsL5E7Q60_hq720.webp\"><source media=\"(min-width:640px)\" type=\"image\/jpeg\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/nCIsL5E7Q60\/nCIsL5E7Q60_hq720.jpg\"><source media=\"(min-width:320px)\" type=\"image\/webp\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/nCIsL5E7Q60\/nCIsL5E7Q60_sddefault.webp\"><source media=\"(min-width:320px)\" type=\"image\/jpeg\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/nCIsL5E7Q60\/nCIsL5E7Q60_sddefault.jpg\"><source media=\"(min-width:240px)\" type=\"image\/webp\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/nCIsL5E7Q60\/nCIsL5E7Q60_hqdefault.webp\"><source media=\"(min-width:240px)\" type=\"image\/jpeg\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/nCIsL5E7Q60\/nCIsL5E7Q60_hqdefault.jpg\"><img decoding=\"async\" src=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/nCIsL5E7Q60\/nCIsL5E7Q60_mqdefault.jpg\" alt=\"\" title=\"\"><\/picture><svg class=\"ma-gdpr-youtube-button\"><use xlink:href=\"#ma-gdpr-youtube-play-button\"><\/use><\/svg><div class=\"ma-gdpr-youtube-notice\" style=\"font-size:.7em;\"><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-materials-used-for-anodising\"><strong>Materials Used for Anodising<\/strong><\/h2>\n\n\n<p>Anodising can only be carried out on conductive materials. The most common materials are aluminium alloys. Non-ferrous metals such as magnesium and titanium can also be anodised (e.g. titanium anodising).\u00a0<\/p>\n\n\n\n<p>Other materials include zinc, niobium, zirconium, hafnium, and tantalum. Ferrous metals are anodised using nitric acid or by using red fuming nitric acid for treatment. This forms a hard black iron (II, III) oxide that maintains conformity.&nbsp;<\/p>\n\n\n\n<p>Steel and other ferrous metals cannot be anodised as they will corrode when subjected to the anodising process.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-colour-1024x683.jpg\" alt=\"Anodised parts in colour\" class=\"wp-image-1708\" style=\"max-width:838px;max-height:558px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-colour-1024x683.jpg 1024w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-colour-300x200.jpg 300w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-colour-768x512.jpg 768w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-colour.jpg 1440w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-colour.jpg\" data-fancybox=\"gallery-11623\" data-caption=\"Anodised parts in colour\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-colour.jpg\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Anodised parts in colour<\/figcaption><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-benefits-of-anodising-aluminium\"><strong>Benefits of Anodising Aluminium<\/strong><\/h2>\n\n\n<p>The following are some of the benefits derived from anodising:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Good surface properties<\/strong>: Anodising improves the surface properties of the material. It increases the part\u2019s corrosion resistance as well as&nbsp; scratch and wear resistant<\/li>\n\n\n\n<li><strong>Better protection<\/strong>: Anodising aluminium offers better protection than painting as the protective layer is one with the part and can neither peel nor chip<\/li>\n\n\n\n<li><strong>Better surface absorption for coatings<\/strong>: The layer created has improved absorption, so paint primers and glue adherence on anodised metals are much better and improved than bare metals<\/li>\n\n\n\n<li><strong>Galling prevention<\/strong>: Anodising prevents galling (wear caused by adhesion of sliding surface) of threaded components such as bolts and nuts<\/li>\n\n\n\n<li><strong>Shiny surface finish<\/strong>: Anodising gives surfaces a shiny aesthetic finish. Also, it provides the option to apply a variety of colours to parts<\/li>\n\n\n\n<li><strong>Good insulation properties<\/strong>: It improves insulation properties as it produces parts with lower electrical conductivity compared to bare metal.<\/li>\n<\/ul>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-anodising-aluminium-in-different-colours\"><strong>Anodising Aluminium in Different Colours<\/strong><\/h2>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>The standard colours available for anodised parts are clear, bronze, champagne and black. Other colours include; red, pink, gold, yellow, green, brown, black, blue, violet, olive drab and grey. But the most common colour is black followed by blue, red and gold.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"h-dyeing\"><strong>Dyeing<\/strong><\/h3>\n\n\n<p>An anodised aluminium part may be dyed or undyed. The part is dipped into a hot dye tank immediately and directly after the anodising process. A variety of colours can be obtained through this process.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-blue-1024x683.png\" alt=\"Anodised parts in blue\" class=\"wp-image-1709\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-blue-1024x683.png 1024w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-blue-300x200.png 300w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-blue-768x512.png 768w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-blue.png 1440w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-blue.png\" data-fancybox=\"gallery-11623\" data-caption=\"Anodised parts in blue\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/Anodised-parts-in-blue.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Anodised parts in blue<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"h-electrolytic-colouring-nbsp\"><strong>Electrolytic Colouring <\/strong><\/h3>\n\n\n<p>Another way of adding colours to anodised aluminium parts is by electrolytic colouring. In this process, the part is immersed in another electrolytic solution together with metallic salts. These salts form coatings that are UV resistant. However, the possible colours are limited to black or bronze.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"h-colour-selection\"><strong>Colour Selection<\/strong><\/h3>\n\n\n<p>Colours for anodised parts can be often selected by either colour name or RAL code. Colour names specify commonly available colours simply by their name, such as green or red. This is the most commonly available option when selecting the colour for anodising.<\/p>\n\n\n\n<p>Large manufacturing plants can sometimes offer to anodise with the <a href=\"https:\/\/www.ralcolorchart.com\/ral-classic\">RAL colour code system<\/a> that gives very exact options for the required colour.&nbsp;<\/p>\n\n\n\n<p>The RAL system differentiates between various shades and types of a particular colour, thus providing a palette of numerous colours.&nbsp;<\/p>\n\n\n\n<p>For example, while the colour name will simply specify \u201cgrey\u201d, the RAL chart specifies \u201d anthracite grey\u201d with the code \u201cRAL 7016\u201d, along with various other types of grey.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"1000\" height=\"750\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-parts-anodised-in-different-colours.jpg\" alt=\"CNC machined parts anodised in different colours\" class=\"wp-image-1710\" style=\"max-width:840px;max-height:630px\" srcset=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-parts-anodised-in-different-colours.jpg 1000w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-parts-anodised-in-different-colours-300x225.jpg 300w, https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-parts-anodised-in-different-colours-768x576.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-parts-anodised-in-different-colours.jpg\" data-fancybox=\"gallery-11623\" data-caption=\"CNC machined parts anodised in different colours\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2023\/09\/CNC-machined-parts-anodised-in-different-colours.jpg\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">CNC machined parts anodised in different colours<\/figcaption><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-get-anodised-aluminium-parts-with-xometry\"><strong>Get Anodised Aluminium Parts with Xometry<\/strong><\/h2>\n\n\n<p>Xometry Europe offers high quality hard and coloured anodising for all our aluminium parts. We offer various colours, including black, blue, gold, green, red, orange, and others.<\/p>\n\n\n\n<p>To request anodised aluminium parts, simply select your preferred type and colour under the finishing column when uploading your model to our Instant Quoting Engine.&nbsp;<\/p>\n\n\n\n<p>If you are uncertain about the type of anodising that\u2019s best for your application, our experts are always standing by to assist.<\/p>\n","protected":false},"author":50,"featured_media":11625,"comment_status":"open","ping_status":"closed","template":"","categories":[],"c-tag-articles":[],"global-tag":[592],"class_list":["post-11623","articles","type-articles","status-publish","has-post-thumbnail","hentry","global-tag-post-processing-uk"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Anodising Aluminium: An Effective Finishing Option | Xometry Pro<\/title>\n<meta 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