{"id":33577,"date":"2025-04-23T16:50:20","date_gmt":"2025-04-23T08:50:20","guid":{"rendered":"https:\/\/www.ray-tron.com\/?p=33577"},"modified":"2025-04-23T16:50:27","modified_gmt":"2025-04-23T08:50:27","slug":"202502-2","status":"publish","type":"post","link":"https:\/\/www.ray-tron.com\/en\/202502-2\/","title":{"rendered":"Technical Analysis of Tinning of Copper Clad Aluminum Rectangular Wire"},"content":{"rendered":"<p>Tinning of copper-clad aluminum strip is an important step to improve its conductivity, weldability and oxidation resistance, especially in<strong><a href=\"https:\/\/www.ray-tron.com\/en\/pvribbon\/\" data-internallinksmanager029f6b8e52c=\"43\" title=\"Photovoltaic welding ribbon\">Photovoltaic welding ribbon<\/a>, battery leads, BMS connectors, etc.<\/strong>Due to the special structure of copper-clad aluminum materials, the tinning process is significantly different from that of pure copper or pure aluminum, and must be specially designed and controlled.<\/p><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h3 class=\"wp-block-heading\">1. Why do we need to tin copper-clad aluminum flat wire?<\/h3><ol class=\"wp-block-list\"><li><strong>Improve welding performance<\/strong><ul class=\"wp-block-list\"><li>After tin plating, the tin layer and solder are easily combined, which improves the reliability and speed of welding.<\/li><\/ul><\/li>\n\n<li><strong>Prevent oxidation corrosion<\/strong><ul class=\"wp-block-list\"><li>Bare copper is easily oxidized, especially in a humid or acidic environment, and the tin layer can provide protection.<\/li><\/ul><\/li>\n\n<li><strong>Enhance contact conductivity<\/strong><ul class=\"wp-block-list\"><li>Tin&#039;s low contact resistance improves the conductive stability of the connection point.<\/li><\/ul><\/li>\n\n<li><strong>Extend service life<\/strong><ul class=\"wp-block-list\"><li>The tin coating can delay the aging and surface degradation of copper-clad aluminum solder strips.<\/li><\/ul><\/li><\/ol><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h3 class=\"wp-block-heading\">2. Technical difficulties before tinning<\/h3><p>The core of copper clad aluminum strip is &quot;copper clad aluminum&quot;, which means that only the copper layer can be tinned. Therefore:<\/p><ul class=\"wp-block-list\"><li><strong>The copper layer thickness must be \u22655\u03bcm<\/strong>If the surface is too thin, aluminum may be exposed during tinning or subsequent welding.<\/li>\n\n<li><strong>The copper layer must be dense and crack-free<\/strong>Otherwise, the penetration of tin liquid will cause peeling or bubbles.<\/li>\n\n<li><strong>The aluminum core must be completely covered<\/strong>, otherwise once the aluminum is exposed, the tin plating will fail and electrochemical corrosion will occur easily.<\/li><\/ul><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h3 class=\"wp-block-heading\">3. Mainstream tinning methods<\/h3><h4 class=\"wp-block-heading\">1. <strong>Hot-Dip Tinning<\/strong><\/h4><ul class=\"wp-block-list\"><li>Process: Pass the copper-clad aluminum strip through a high-temperature molten tin bath.<\/li>\n\n<li>Advantages: Uniform tin layer, strong adhesion, suitable for continuous large-scale production.<\/li>\n\n<li>Application: Mainstream photovoltaic ribbons such as<a href=\"https:\/\/www.ray-tron.com\/en\/\" data-internallinksmanager029f6b8e52c=\"19\" title=\"Ruichuang 2\">Raytron<\/a>This method is widely used in products.<\/li><\/ul><h4 class=\"wp-block-heading\">2. <strong>Electroplating Tinning<\/strong><\/h4><ul class=\"wp-block-list\"><li>Process: Tin is attached to the surface copper by electrolysis.<\/li>\n\n<li>Advantages: The tin layer is thinner and more uniform, highly controllable, and suitable for high-precision requirements.<\/li>\n\n<li>Disadvantages: It requires higher bonding strength of the copper layer and is not suitable for flat wires with too thin copper layers.<\/li><\/ul><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h3 class=\"wp-block-heading\">4. Performance requirements after tinning<\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>project<\/th><th>Technical requirements<\/th><\/tr><\/thead><tbody><tr><td>Surface tin layer thickness<\/td><td>\u2265 5\u03bcm (usually up to 8~12\u03bcm)<\/td><\/tr><tr><td>Tin layer uniformity<\/td><td>No obvious ripples, delamination or tin nodules on the surface<\/td><\/tr><tr><td>Adhesion<\/td><td>95% and above pass the tape peeling test<\/td><\/tr><tr><td>Weldability<\/td><td>Tin wetting time &lt; 2 seconds, no false solder joints or leaks<\/td><\/tr><tr><td>Changes in conductivity<\/td><td>Resistivity change before and after tinning \u22645%<\/td><\/tr><\/tbody><\/table><\/figure><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h3 class=\"wp-block-heading\">5. Ruichuang&#039;s advantages in flat wire tinning<\/h3><p>Ruichuang is a leading<strong>Small size copper clad aluminum flat wire manufacturer<\/strong>, has the following technical advantages in tinning:<\/p><ul class=\"wp-block-list\"><li>High-speed hot-dip tinning line ensures uniform tin layer thickness per meter of strip;<\/li>\n\n<li>Multi-stage annealing + cleaning + anti-oxidation treatment to ensure the cleanliness of the solder strip;<\/li>\n\n<li>Customize the thickness of the tin layer to meet the welding needs of different customers;<\/li>\n\n<li>Precision straightening treatment to avoid cracking of the tin layer due to bending.<\/li><\/ul><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h3 class=\"wp-block-heading\">Summarize<\/h3><p>Tinning of copper-clad aluminum flat wire is a key link to improve its comprehensive performance, which must rely on high-quality copper layer structure and stable tinning process.<a href=\"https:\/\/www.ray-tron.com\/en\/tongbaolvdai\/\" data-internallinksmanager029f6b8e52c=\"178\" title=\"Copper clad aluminum strip manufacturer_Copper clad aluminum wire supplier_Copper clad aluminum strip wholesaler manufacturer\">Copper clad aluminum strip<\/a>It can not only replace traditional pure copper welding strips, but also achieve higher cost performance, making it an ideal choice for the photovoltaic industry.<\/p><p><\/p>","protected":false},"excerpt":{"rendered":"<p>Tinning of copper-clad aluminum strip is an important step to improve its conductivity, weldability and anti-oxidation performance, especially in the fields of photovoltaic welding strips, battery leads, BMS connectors, etc.<\/p>","protected":false},"author":1,"featured_media":9053,"comment_status":"closed","ping_status":"closed","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":"","background-image":"","background-repeat":"repeat","background-position":"center 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