{"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":"","tve_updated_post":"<div class=\"thrv_wrapper tve_wp_shortcode\"><div class=\"tve_shortcode_raw\" style=\"display: none\">___TVE_SHORTCODE_RAW__&lt;p&gt;&lt;!-- wp:paragraph --&gt;&lt;\/p&gt;\n&lt;p&gt;An experiment was conducted to investigate which impurities interfere with depth scattering during electrolytical tin colouring. The aim of the experiment was to determine the influence of individual foreign ions on the homogeneity of the deposited tin layer and the associated optical scattering properties.&lt;\/p&gt;\n&lt;p&gt;&lt;!-- \/wp:paragraph --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:heading --&gt;&lt;\/p&gt;\n&lt;h2 class=\"wp-block-heading\"&gt;Experimental procedure&lt;\/h2&gt;\n&lt;p&gt;&lt;!-- \/wp:heading --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:paragraph {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\"} --&gt;&lt;\/p&gt;\n&lt;p class=\"has-black-color has-text-color has-link-color\"&gt;For the experiment, EN AW 5005 metal strips were first chemically pretreated and anodised in the same way. Then 6 cells were filled with tin colouring bath and each was contaminated with different foreign ions that could potentially interfere with the deposition process. These included:&lt;\/p&gt;\n&lt;p&gt;&lt;!-- \/wp:paragraph --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:list --&gt;&lt;\/p&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li style=\"list-style-type: none;\"&gt;\n&lt;ul class=\"wp-block-list\"&gt;&lt;!-- wp:list-item {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\"} --&gt;\n&lt;li class=\"has-black-color has-text-color has-link-color\"&gt;Approx. 1200 mg\/L chloride&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;p&gt;&lt;!-- \/wp:list-item --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:list-item {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\"} --&gt;&lt;\/p&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li style=\"list-style-type: none;\"&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li class=\"has-black-color has-text-color has-link-color\"&gt;Approx. 300 mg\/L nitrate&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;p&gt;&lt;!-- \/wp:list-item --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:list-item {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\"} --&gt;&lt;\/p&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li style=\"list-style-type: none;\"&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li class=\"has-black-color has-text-color has-link-color\"&gt;Approx. 1000 mg\/L phosphate&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;p&gt;&lt;!-- \/wp:list-item --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:list-item {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\"} --&gt;&lt;\/p&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li style=\"list-style-type: none;\"&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li class=\"has-black-color has-text-color has-link-color\"&gt;Approx. 2000 mg\/L oxalic acid&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;p&gt;&lt;!-- \/wp:list-item --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:list-item {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\"} --&gt;&lt;\/p&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li style=\"list-style-type: none;\"&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li class=\"has-black-color has-text-color has-link-color\"&gt;Approx. 2000 mg\/L sodium and&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;p&gt;&lt;!-- \/wp:list-item --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:list-item {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\"} --&gt;&lt;\/p&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li style=\"list-style-type: none;\"&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li class=\"has-black-color has-text-color has-link-color\"&gt;Approx. 2000 mg\/L aluminium&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;p&gt;&lt;!-- \/wp:list-item --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- \/wp:list --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:paragraph --&gt;&lt;\/p&gt;\n&lt;p&gt;After electrolytical colouring of the metal strips in the respective cells, the samples were compared optically with regard to their depth scattering. The coloured metal strips are shown in the figure from left to right. The depth scattering results from the loss of colour from left to right. The more intense the colouring of the metal strips on the right-hand side, the better the depth scattering of the bath solution prepared. Of course, the effect can be more pronounced with higher concentrations of impurities.&lt;\/p&gt;\n&lt;p&gt;&lt;!-- \/wp:paragraph --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:heading --&gt;&lt;\/p&gt;\n&lt;h2 class=\"wp-block-heading\"&gt;Observation of the results&lt;\/h2&gt;\n&lt;p&gt;&lt;!-- \/wp:heading --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:paragraph --&gt;&lt;\/p&gt;\n&lt;p&gt;The test data show that the addition of specific impurities leads to different disturbances in the deposition process. The detailed observations are as follows:&lt;\/p&gt;\n&lt;p&gt;&lt;!-- \/wp:paragraph --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:list --&gt;&lt;\/p&gt;\n&lt;ul class=\"wp-block-list\"&gt;\n&lt;li style=\"list-style-type: none;\"&gt;\n&lt;ul class=\"wp-block-list\"&gt;&lt;!-- wp:list-item {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\"} --&gt;\n&lt;li class=\"has-black-color has-text-color has-link-color\"&gt;Contamination by chloride:&lt;br \/&gt;While there is only a moderate decrease in depth scattering, there is a complete loss of the entire oxide layer due to spalling (left).&lt;br \/&gt;&lt;br \/&gt;&lt;\/li&gt;\n&lt;li class=\"has-black-color has-text-color has-link-color\"&gt;Sodium contamination:&lt;br \/&gt;Compared to the other contaminants, there is a significant loss of depth scattering at this concentration.&lt;br \/&gt;&lt;br \/&gt;&lt;\/li&gt;\n&lt;li class=\"has-black-color has-text-color has-link-color\"&gt;Nitrate contamination:&lt;br \/&gt;The negative effect on the depth scatter of the dye bath is most evident here. Even 300 mg\/L leads to a massive loss of colour.&lt;br \/&gt;&lt;br \/&gt;&lt;\/li&gt;\n&lt;li class=\"has-black-color has-text-color has-link-color\"&gt;&lt;span style=\"color: #000000;\"&gt;Contamination by phosphate:&lt;\/span&gt;&lt;br \/&gt;&lt;span style=\"color: #000000;\"&gt;In the experiment, the least influence on the depth scattering of the bath can be seen here.&lt;br \/&gt;&lt;br \/&gt;&lt;\/span&gt;&lt;\/li&gt;\n&lt;li class=\"has-black-color has-text-color has-link-color\"&gt;Oxalic acid or aluminium&lt;br \/&gt;Here there is a slight influence on the depth scattering of the bath, but this is less pronounced than with sodium.&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;p&gt;&lt;!-- \/wp:list-item --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:list-item {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\"} --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- \/wp:list-item --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:list-item {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\"} --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;span style=\"color: #000000;\"&gt;&lt;!-- \/wp:list-item --&gt;&lt;\/span&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;span style=\"color: #000000;\"&gt;&lt;!-- wp:list-item {\"style\":{\"elements\":{\"link\":{\"color\":{\"text\":\"var:preset|color|black\"}}}},\"textColor\":\"black\"} --&gt;&lt;\/span&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- \/wp:list-item --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- \/wp:list --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:heading --&gt;&lt;\/p&gt;\n&lt;h2 class=\"wp-block-heading\"&gt;Evaluation of the results&lt;\/h2&gt;\n&lt;p&gt;&lt;!-- \/wp:heading --&gt;&lt;\/p&gt;\n&lt;p&gt;&lt;!-- wp:paragraph --&gt;&lt;\/p&gt;\n&lt;p&gt;Nitrates interfere most strongly with the depth scattering of the electrolytical tin colouring bath. Even small quantities are sufficient to prevent correct colouring. Nitrates can, for example, enter the colouring bath over time via the transport of goods when using a nitric acid desmutting and thus gradually cause disturbances. The good news is that nitrate interference can be effectively eliminated by adding Correction solution 600. In most cases, the original colouring performance of the bath can be restored.&lt;\/p&gt;\n&lt;p&gt;&lt;!-- \/wp:paragraph --&gt;&lt;\/p&gt;__TVE_SHORTCODE_RAW___<\/div><\/div>","tve_custom_css":"@media (min-width: 300px){.tcb-post-list[data-css=\"tve-u-16ecb5f152b\"] .post-wrapper.thrv_wrapper { width: calc(50% - 20px); }.tcb-post-list[data-css=\"tve-u-16ecb5f152b\"] .post-wrapper.thrv_wrapper:nth-child(n+3) { margin-top: 40px !important; }.tcb-post-list[data-css=\"tve-u-16ecb5f152b\"] .post-wrapper.thrv_wrapper:not(:nth-child(n+3)) { margin-top: 0px !important; }.tcb-post-list[data-css=\"tve-u-16ecb5f152b\"] .post-wrapper.thrv_wrapper:not(:nth-child(2n)) { margin-right: 40px !important; }.tcb-post-list[data-css=\"tve-u-16ecb5f152b\"] .post-wrapper.thrv_wrapper:nth-child(2n) { margin-right: 0px !important; }}","tve_user_custom_css":"","tve_globals":{"e":"1","font_cls":[]},"tcb2_ready":1,"tcb_editor_enabled":1,"tve_landing_page":"","_tve_header":"","_tve_footer":""},"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 v27.5 - 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