{"id":2221,"date":"2019-06-25T10:58:59","date_gmt":"2019-06-25T09:58:59","guid":{"rendered":"https:\/\/priatherm.com\/?p=2221"},"modified":"2023-01-09T15:39:59","modified_gmt":"2023-01-09T14:39:59","slug":"the-anodization-of-a-heat-sink","status":"publish","type":"post","link":"https:\/\/priatherm.com\/en\/the-anodization-of-a-heat-sink\/","title":{"rendered":"The anodization of a heat sink"},"content":{"rendered":"<p><strong>Anodization of heat sink<\/strong><\/p>\n<p>In some cases, a surface treatment on the aluminum heat sink is required by the application. This article will focus on the most common treatment used in thermal management: anodization. Following a list of different solutions, we will talk about the characteristics of anodization, some theory, norms and the manufacturing process.<\/p>\n<p><u>Heat sinks treatments<\/u><\/p>\n<ul>\n<li>Anodization<\/li>\n<li>Surtec 650<\/li>\n<li>Painting\/powder coating<\/li>\n<li>Others (tin or nickel plating, etc.)<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2223 size-medium aligncenter\" src=\"https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture1-300x235.png\" alt=\"\" width=\"300\" height=\"235\" srcset=\"https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture1-300x235.png 300w, https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture1.png 354w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Surtec 650 is a chromium (VI)-free trivalent passivation for aluminum. It provides fairly effective protection to corrosion, is a good pre-treatment for painting, and is electrically conductive. It has a typical thickness of 1 -3 micron, and is often uncolored.<\/p>\n<p>Coating can be done with different kind of paints, both liquid and solid (powder); a pre-treatment is always necessary to remove the natural oxide layer (e.g. pickling, phosphating, chromatizing, etc.). Different resins are used; polyester-based are the best in terms of chemical and mechanical resistance, as well as for external applications. Average thickness of the layers is 40-80 micron.<\/p>\n<p>&nbsp;<\/p>\n<p><u>Anodization characteristics<\/u><\/p>\n<ul>\n<li>Electrical insulation (breakdown voltage varies from a few to several hundred volts, depending on the alloy and on the nature and thickness of the film)<\/li>\n<li>Corrosion resistance (the acetic salt spray test of ISO 9227 expects anodized aluminum to show no pitting after 24 hours)<\/li>\n<li>Superficial hardness (typ. 350-400 Vickers vs. Al alloy typ. 100)<\/li>\n<li>Increased emissivity (higher radiation effect in natural convection)<\/li>\n<li>Abrasion resistance (especially hard anodizing)<\/li>\n<li>Paint adhesion<\/li>\n<li>Decorative appearance \/ colors improvement<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><u>Anodization theory<\/u><\/p>\n<p>Anodization is an electrolytic conversion of aluminum surface to aluminum oxide. Aluminum oxide is corrosion resistant and impervious to atmospheric and salt water attack.<\/p>\n<p>Colorization processes apply only to the external layers, and quality of the coloration does not depend on the thickness of oxide.<\/p>\n<p>Common processes for colorization:<\/p>\n<ul>\n<li><strong>Dyeing<\/strong>: consists in impregnating the pores of the anodic coating, then sealing, using an organic coloring material<\/li>\n<li><strong>Electro-colorization<\/strong>: using an alternating current, a metallic pigment is electrodeposited in the pores of the anodic coating. Color depends on the metallic salt used\n<ul>\n<li>In some applications a combination of the above processes is used.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2224 size-medium aligncenter\" src=\"https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture2-300x284.png\" alt=\"\" width=\"300\" height=\"284\" srcset=\"https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture2-300x284.png 300w, https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture2.png 347w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2225 size-full aligncenter\" src=\"https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture3.png\" alt=\"\" width=\"239\" height=\"252\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>The sealing process is fundamental for the final quality of the coating and its coloration. In fact, anodizing processes cause porous aluminum oxide layers that do not increase corrosion resistance of raw material: <u>a well-done sealing phase is mandatory<\/u>. It is the last operation of the anodic oxidation cycle and guarantees protection, durability and quality of the finished product. Sealing \u201ccloses\u201d the pores of anodic oxide:<\/p>\n<ul>\n<li>Hot process: hydration of anodic oxide to high temperature by immersion in acidified water (100\u00b0C \u2013 pH 6 ca.)<\/li>\n<li>Cold process: closing of the pores by precipitation of metallic salts (e.g. nickel hydroxide)<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2226 size-medium aligncenter\" src=\"https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture4-300x185.png\" alt=\"\" width=\"300\" height=\"185\" srcset=\"https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture4-300x185.png 300w, https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture4.png 304w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2227 size-full aligncenter\" src=\"https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture5.png\" alt=\"\" width=\"285\" height=\"168\" \/><\/p>\n<p><u>Norms<\/u><\/p>\n<p>Anodization is regulated by:<\/p>\n<ul>\n<li>Internationalreference UNI EN ISO 7599:2018 (Anodizing of aluminum and its alloys &#8211; Method for specifying decorative and protective anodic oxidation coatings on aluminum)<\/li>\n<li>German standard DIN 17611: 2011 (Anodized Products of Wrought Aluminum And Wrought Aluminum Alloys &#8211; Technical Conditions Of Delivery (Foreign Standard))<\/li>\n<li>UNI 10681:2010 (Aluminum and aluminum alloys \u2013 General characteristics of anodic oxide layers for use in decorative and protective field)<\/li>\n<\/ul>\n<p><u>Thickness table \u2013 applications (UNI EN ISO 7599:2018)<\/u><\/p>\n<table width=\"652\">\n<tbody>\n<tr>\n<td width=\"45\"><strong>Class<\/strong><\/td>\n<td width=\"135\"><strong>Min. average thickness (<\/strong><strong>m<\/strong><strong>m)<\/strong><\/td>\n<td width=\"104\"><strong>Min. local thickness (<\/strong><strong>m<\/strong><strong>m)<\/strong><\/td>\n<td width=\"369\"><strong>Applications<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"45\">AA5<\/td>\n<td width=\"135\">5<\/td>\n<td width=\"104\">4<\/td>\n<td rowspan=\"2\" width=\"369\">General internal application. This coating is used where somewhat limited protection from corrosion and abrasion is suitable.<\/td>\n<\/tr>\n<tr>\n<td width=\"45\">AA10<\/td>\n<td width=\"135\">10<\/td>\n<td width=\"104\">8<\/td>\n<\/tr>\n<tr>\n<td width=\"45\"><strong>AA15<\/strong><\/td>\n<td width=\"135\"><strong>15<\/strong><\/td>\n<td width=\"104\"><strong>12<\/strong><\/td>\n<td width=\"369\"><strong>Internal and external applications without particular pollution conditions.<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"45\">AA20<\/td>\n<td width=\"135\">20<\/td>\n<td width=\"104\">16<\/td>\n<td width=\"369\">External applications in locations where industrial pollution is high or in industrial marine situations.<\/td>\n<\/tr>\n<tr>\n<td width=\"45\">AA25<\/td>\n<td width=\"135\">25<\/td>\n<td width=\"104\">20<\/td>\n<td width=\"369\">Special applications: especially aggressive atmosphere.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><u>Process and specifications<\/u><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2228 size-medium aligncenter\" src=\"https:\/\/priatherm.com\/wp-content\/uploads\/2019\/06\/Picture6-300x172.png\" alt=\"\" width=\"300\" height=\"172\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Priatherm products are anodized using SULPHURICS ANODIZING. Colorization process can be done by:<\/p>\n<ul>\n<li>Colorization with organic pigments<\/li>\n<li>Electro-colorization<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Regarding the thickness of the layer, parameters for selection are:<\/p>\n<ul>\n<li>Internal-external applications without particularly aggressive conditions:\n<ul>\n<li>Class AA10 \u2013 UNI EN ISO 7599 (min. average thickness 10 \u00b5m)<\/li>\n<\/ul>\n<\/li>\n<li>External applications with aggressive conditions (e.g. solar applications, sea environmental, etc.):\n<ul>\n<li>Class AA15 \u2013 UNI EN ISO 7599 (min. average thickness 15 \u00b5m)<\/li>\n<\/ul>\n<\/li>\n<li>Special applications \/ specific requirements:\n<ul>\n<li>Class AA20 UNI EN ISO 7599 (min. average thickness 20 \u00b5m)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>It is important to specify where signs of jigging on the anodized part are allowed, because electrical contact of the process is maintained by at least 2 \u201cfixing points\u201d on the piece, which remain uncolored and can leave some marks on the surfaces. Usually clips, hooks in drilled holes, and jigs are used and, without particular specification, the fixing method is chosen based on its economical benefits. Customers must underline in the preliminary stage of the request whether there are critical aspects linked to the \u201cfixing marks\u201d: necessary actions have to be agreed and specified.<\/p>\n<p>Acceptable limits of variation of final surface finish are identified preferably by agreed limit samples.<\/p>\n<p>Every additional requirement (e.g. color, corrosion resistance, aesthetical) shall be specified and agreed between customer and supplier at the very beginning of the project to reach the best result!<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #ff9900;\">Click on the picture and download our free e-book<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 20px;\">&#8220;Four Common Mistakes To Avoid When Selecting a Heat Sink&#8221;<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1924 size-medium aligncenter\" src=\"https:\/\/priatherm.com\/wp-content\/uploads\/2018\/07\/mockup-e-book-255-212x300.jpg\" alt=\"\" width=\"212\" height=\"300\" srcset=\"https:\/\/priatherm.com\/wp-content\/uploads\/2018\/07\/mockup-e-book-255-212x300.jpg 212w, https:\/\/priatherm.com\/wp-content\/uploads\/2018\/07\/mockup-e-book-255.jpg 255w\" sizes=\"(max-width: 212px) 100vw, 212px\" \/><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Anodization of heat sink In some cases, a surface treatment on the aluminum heat sink is required by the application. This article will focus on the most common treatment used in thermal management: anodization. Following a list of different solutions, we will talk about the characteristics of anodization, some theory, norms and the manufacturing process. [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2223,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[15],"tags":[],"class_list":["post-2221","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-priatherm-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The anodization of a heat sink - Priatherm<\/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:\/\/priatherm.com\/en\/the-anodization-of-a-heat-sink\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The anodization of a heat sink - Priatherm\" \/>\n<meta property=\"og:description\" content=\"Anodization of heat sink In some cases, a surface treatment on the aluminum heat sink is required by the application. 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This article will focus on the most common treatment used in thermal management: anodization. Following a list of different solutions, we will talk about the characteristics of anodization, some theory, norms and the manufacturing process. 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