{"id":10210,"date":"2025-02-21T12:23:19","date_gmt":"2025-02-21T10:23:19","guid":{"rendered":"https:\/\/alufinish.de\/?p=10210"},"modified":"2025-02-21T12:24:41","modified_gmt":"2025-02-21T10:24:41","slug":"influence-of-impurities-on-depth-scattering-during-electrolytical-tin-colouring-of-aluminium","status":"publish","type":"post","link":"https:\/\/alufinish.de\/en\/influence-of-impurities-on-depth-scattering-during-electrolytical-tin-colouring-of-aluminium\/","title":{"rendered":"Influence of impurities on depth scattering during electrolytical tin colouring of aluminium"},"content":{"rendered":"<p>\n<p>Im Rahmen eines Versuchs wurde untersucht, welche Verunreinigungen die Tiefenstreuung beim elektrolytischen Zinnf\u00e4rben von Aluminium st\u00f6ren. Ziel des Versuchs war es, den Einfluss einzelner Fremdionen auf die Homogenit\u00e4t der abgeschiedenen Zinnschicht sowie auf die damit verbundenen optischen Streueigenschaften zu ermitteln.<\/p><p><\/p><\/p>\n<p>\n<h2 class=\"wp-block-heading\">Versuchsablauf<\/h2><p><\/p><\/p>\n<p>\n<p>F\u00fcr den Versuch wurden zun\u00e4chst EN AW 5005 Metallstreifen in gleicher Weise chemisch vorbehandelt und eloxiert. Anschlie\u00dfend wurden 6 Zellen mit Zinnf\u00e4rbebad bef\u00fcllt und jeweils mit verschiedenen Fremdionen verunreinigt, die potenziell den Abscheideprozess st\u00f6ren k\u00f6nnen. Dazu z\u00e4hlten:<\/p><p><\/p><\/p>\n<p>\n<\/p><ul class=\"wp-block-list\"><li style=\"list-style-type: none;\"><ul><li class=\"wp-elements-4ddb70e00f16c1c06468e862d3e04a60\">Ca. 1200 mg\/L Chlorid<\/li><p><\/p><\/p><p><ul class=\"wp-elements-b5a79080f3e9214c80eb238f1c1491b4\"><li style=\"list-style-type: none;\"><ul><li>Ca. 300 mg\/L Nitrat<\/li><\/ul><\/li><\/ul><p><\/p><\/p><p><ul class=\"wp-elements-2241918530e70863e227c5e12ebad34d\"><li style=\"list-style-type: none;\"><ul><li>Ca. 1000 mg\/L Phosphat<\/li><\/ul><\/li><\/ul><p><\/p><\/p><p><ul class=\"wp-elements-d419b89412d4818846cee1ec7cfc0160\"><li style=\"list-style-type: none;\"><ul><li>Ca. 2000 mg\/L Oxals\u00e4ure<\/li><\/ul><\/li><\/ul><p><\/p><\/p><p><ul class=\"wp-elements-e9ab297be35bdd418f090ced99eb6251\"><li style=\"list-style-type: none;\"><ul><li>Ca. 2000 mg\/L Natrium und<\/li><\/ul><\/li><\/ul><p><\/p><\/p><p><ul class=\"wp-elements-da0f6d282dc2779ede3f7b36549f0d90\"><li style=\"list-style-type: none;\"><ul><li>Ca. 2000 mg\/L Aluminium<\/li><\/ul><\/li><\/ul><p><\/p><\/p><p><\/p>\n<p>\n<p>Nach der elektrolytischen F\u00e4rbung der Metallstreifen in den jeweiligen Zellen wurden die Proben optisch hinsichtlich ihrer Tiefenstreuung verglichen. Die gef\u00e4rbten Metallstreifen sind im Bild von links nach rechts zu bewerten. Die Tiefenstreuung ergibt sich aus dem Farbverlust von links nach rechts. Je intensiver die Metallstreifen auf der rechten Seite gef\u00e4rbt sind, desto besser ist die Tiefenstreuung der jeweiligen, pr\u00e4parierten Badl\u00f6sung. Bei noch h\u00f6heren Konzentrationen an Verunreinigungen kann der Einfluss nat\u00fcrlich deutlicher ausfallen.<\/p><p><\/p><\/p>\n<p>\n<h2 class=\"wp-block-heading\">Beobachtung der Ergebnisse<\/h2><p><\/p><\/p>\n<p>\n<p>Die Versuchsdaten zeigen, dass die Zugabe spezifischer Verunreinigungen zu unterschiedlichen St\u00f6rungen im Abscheideprozess f\u00fchrt. Die detaillierten Beobachtungen lauten wie folgt:<\/p><p><\/p><\/p>\n<p>\n<\/p><ul class=\"wp-block-list\"><li style=\"list-style-type: none;\"><ul><li class=\"wp-elements-5e399d9a62c960d7012906f2b3adf9ca\">Verunreinigung durch Chlorid:W\u00e4hrend die Tiefenstreuung nur moderat nachl\u00e4sst, ist stattdessen ein vollst\u00e4ndiger Verlust der gesamten Oxidschicht durch Abplatzen (auf der linken Seite) zu erkennen<\/li><p><\/p><\/p><p><ul class=\"wp-elements-53083ffdcfa2199f10c9956f1169759c\"><li style=\"list-style-type: none;\"><ul><li>Verunreinigung durch Natrium: Im Vergleich zu den anderen Verunreinigungen ist ein deutlicher Verlust an Tiefenstreuung bei dieser Konzentration festzustellen<\/li><\/ul><\/li><\/ul><p><\/p><\/p><p><ul class=\"wp-elements-ecca78c9a1ad1cf8080b37a1347982c1\"><li style=\"list-style-type: none;\"><ul><li>Verunreinigung durch Nitrat:Hier zeigt sich am deutlichsten der negative Einfluss auf die Tiefenstreuung des F\u00e4rbebades. Bereits 300 mg\/L f\u00fchren hier zu einem massiven Farbverlust.<\/li><\/ul><\/li><\/ul><p><\/p><\/p><p><ul class=\"wp-elements-d0e6198955a5e7838ed29abd7dd35fd7\"><li style=\"list-style-type: none;\"><ul><li>Verunreinigung durch Phosphat:Im Versuch ist hier der geringste Einfluss auf die Tiefenstreuung des Bades festzustellen.<\/li><\/ul><\/li><\/ul><p><\/p><\/p><p><ul class=\"wp-elements-76624d813b4ce0fb109b6e1853da7952\"><li style=\"list-style-type: none;\"><ul><li>Oxals\u00e4ure bzw. AluminiumHier zeigt sich ein leichter Einfluss auf die Tiefenstreuung des Bades, der aber geringer als beim Natrium ausf\u00e4llt.<\/li><\/ul><\/li><\/ul><p><\/p><\/p><p><\/p>\n<p>\n<h2 class=\"wp-block-heading\">Bewertung der Ergebnisse<\/h2><p><\/p><\/p>\n<p>\n<p>Nitrate st\u00f6ren am st\u00e4rksten die Tiefenstreuung des elektrolytischen Zinnf\u00e4rbebades. Bereits geringe Mengen reichen aus, um eine korrekte F\u00e4rbung zu verhindern. Nitrate k\u00f6nnen z.B. bei Verwendung einer Salpeters\u00e4ure-Dekapierung \u00fcber den Warentransport im Laufe der Zeit in das F\u00e4rbebad gelangen und so allm\u00e4hlich St\u00f6rungen verursachen. Die gute Nachricht: Nitratst\u00f6rungen k\u00f6nnen durch Zugabe von Korrekturl\u00f6sung 600 wirksam beseitigt werden. Dadurch l\u00e4sst sich in den meisten F\u00e4llen die urspr\u00fcngliche F\u00e4rbeleistung des Bades wieder herstellen.<\/p><p><\/p><\/p>\n<p>\n<p><\/p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Im Rahmen eines Versuchs wurde untersucht, welche Verunreinigungen die Tiefenstreuung beim elektrolytischen Zinnf\u00e4rben von Aluminium st\u00f6ren. Ziel des Versuchs war es, den Einfluss einzelner Fremdionen auf die Homogenit\u00e4t der abgeschiedenen Zinnschicht sowie auf die damit verbundenen optischen Streueigenschaften zu ermitteln. Versuchsablauf F\u00fcr den Versuch wurden zun\u00e4chst EN AW 5005 Metallstreifen in gleicher Weise chemisch vorbehandelt [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":10220,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57],"tags":[],"class_list":["post-10210","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-error-patterns","post-wrapper","thrv_wrapper"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Influence of impurities on depth scattering during electrolytical tin colouring of aluminium - Alufinish<\/title>\n<meta name=\"description\" content=\"Investigation of depth scattering and colour loss after targeted contamination during electrolytic tin colouring\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/alufinish.de\/en\/influence-of-impurities-on-depth-scattering-during-electrolytical-tin-colouring-of-aluminium\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Influence of impurities on depth scattering during electrolytical tin colouring of aluminium - 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