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铝合金压铸件电镀表面处理办法有哪几种
发布日期:2021-11-19 17:40:28
压铸铝合金含硅 6.5% ~ 7.5%, 硅含量高, 使材料在压铸过程中具有良好的流动性。压铸铝重量轻, 机械强度好, 导电性好, 导热性好, 无磁性, 可用于压铸技术, 具有较高的尺寸精度。但是压铸铝合金层的附着力较差, 耐腐蚀性有待提高。其成分和功能可以看作是电镀彩色锌和铬酸盐的处理。
 
第一,压铸铝合金表面电镀彩色锌
 
铝本身是一种两性金属, 在酸性或碱性溶液中是不稳定的。此外, 压铸铝合金本身结构松散, 存在水泡、毛孔等缺陷, 往往影响镀层质量。经过适当的应用, 压铸零件的电铸变得容易, 镀锌层约 10μm, 然后经过处理, 压铸铝合金的电阻可以加倍, 有机保护膜可以浸渍在以防止有色锌变色。
 
第二,压铸铝合金表面的铬酸盐处理
 
压铸铝合金经过处理后, 可直接进行铬酸盐处理, 从而在表面获得钝化膜。该薄膜可根据需要无色至黄色, 且不影响表面电阻, 以满足产品的三性要求。它可以在铬酸盐处理后喷洒。

 铝合金压铸件 电镀

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