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How to improve the quality of hard chromium electroplating products is the key
Mechanical pretreatment & rarr; Pre degreasing & rarr; Upper hanger & rarr; Device shield & rarr; Degreasing & rarr; Water washing & rarr; Rust removal & rarr; Water washing & rarr; Anodic corrosion & rarr; Hard chromium plating & rarr; Water washing & rarr; Removing shields and hangers
1、 机械预处理：
机械精加工：最终一道磨痕要细，是它很简单抛光掉（否则磨痕会在镀铬时导致麻点和气痕）。
2、 预除油：
三氯乙烯或过氯乙烯除油。
3、 上挂具：
选择或制作合适的挂具装置。
4、 装置屏蔽物：
装置辅佐阴极和辅佐阳极、在不要镀铬的部位涂漆和蜡或包裹塑料薄膜。
5、 除油：
用专用除蜡水除油。
6、 水洗：
水洗需完全：零件潮湿需均匀。
7、 除锈：
用15%-20%的稀硫酸溶液除锈。
8、 阳极腐蚀：
阳极腐蚀技术：铬酐120-350 g/l，硫酸：10 g/l，阴极：与镀铬阳极同，温度：与镀铬温度一样，电流：30-50A//dm2，时间：视基体而定。
9、 镀铬：
给电前预热：使零件温度挨近或等于镀液温度。
给电方法：铸铁件镀铬先用冲击电流电镀，然后再康复到正常电流密度；合金钢件镀铬选用阶梯式给电；铬上镀铬先进行阳极浸蚀然后阶梯式给电。
This article is from:http://www.newstar-china.com/
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