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What should be paid attention to when the hard chromium layer is removed and then plated
Hard chromium is removed and then plated. Usually, chromium is not plated or some parts are not plated. The reason is that the parts have been hydrogenated during chromium plating, and a lot of carbon is precipitated after the plating is removed. This phenomenon occurs more on cast iron.
假如遇到退除后再镀时，只见很多析出气体而不见镀层堆积，造成这个成果就是在第一次电镀时渗氢，致 使氢的过电位变小。要想处理这个问题，就要在镀层退除后，加一道除氢工序，小型零件可在烤箱内烘烤，大 型零件可用热油除氢。
别的要合理的挑选退除办法，应尽量防止运用盐酸退除。特别是铸铁件因富含很多的碳，又有很多孔隙、 裂纹、砂眼等，退除后应根据具体情况，一选用相应办法，将外表处理干净。
This article is from:http://www.newstar-china.com/
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