介绍了三价铬电镀的工艺特点,重点介绍了三价铬电镀中杂质的去除和镀硬(厚)铬工艺.三价铬电镀对杂质非常敏感,极少量的杂质就会大大恶化镀层质量.常采用沉淀法、离子交换树脂、螯合剂等方法来除去杂质;另外,三价铬不能镀厚铬也是目前面临的一大难题,原因之一是因为阴极上有大量的氢气析出,pH升高,从而Cr3+形成氢氧化物,附着在镀件表面,致使镀层不致密,易脱落而无法增厚;此外,Cr3+氧化产物Cr6+还会毒化镀液.因此,要镀上厚铬,就必须对镀液进行调整,如降低pH,或选择更好的缓冲剂等方法.
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