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Ways to improve the adhesion of cyanide free alkaline copper plating on Zn alloy sf-628
Sf-628 cyanide free alkaline copper plating has excellent dispersion ability and deep plating ability. It can easily perform pre plating and thickening plating on various substrates. The coating is beautiful and semi bright. It is an ideal alternative process to traditional cyanide copper plating. It has been used industrially in Europe and America for several years.
在我国，由于行政上的原因，无氰碱性镀铜工艺以往都会集在单一镀种的研究开发上，而环绕其大规模出产运用的相关工艺支撑却甚少，从而限制了它的推行使用。特别锌压铸件无氰碱性镀铜后的结合力问题一直得不到有用处理。咱们通过试验和出产使用，在锌合金压铸件上选用SF-628无氰碱性镀铜工艺和本公司的镀前处理工艺，取得了优良的附着力，为进一步推行无氰碱铜工艺积累了有益的经历。
咱们知道，氰化镀铜液中所含氰化物是一种很强的络合剂，同时又是一种很有用的去垢活化剂，它能在相当程度上弥补锌合金压铸件前处理中的不良施行，电镀时氰化镀铜液甚至能渗镀到基材外表很纤细的缩孔、晶间空隙中，相比之下，SF-628无氰碱铜不含强螯合剂，因而更容易导致锌压铸件结合力不良现象发生。而要进步其结合力，结合国内的成功经历咱们认为从以下几个方面入手：
1、进步锌压铸件基材的电镀适用性：这包括选用合格优良合金成份的锌铝铸料，先进的模具制造及铸造工艺，可靠的磨抛光工艺等外表致密光洁度高的工件，可有用进步锌铝铸件外表镀层的结合力。
2、选用有效的镀前活化处理工艺：优先选用对锌合金铸件温和、有效的化学电解脱脂去垢工艺。恰当引进阳极电免除油，对进步其结合力有很大的帮助，选用阳极电免除油可有用消除以往阴极电免除油因析氢形成的锌压铸件镀层起泡。其次，合适的阳极电免除油对零件外表积垢、挂灰等有很佳的去除才能，也能大大进步铜镀层在锌铸件外表的结合力。
3、实行严厉的工艺办理、工艺控制：SF-628无氰碱性镀铜液对杂质较敏感，过量积累的无机、有机杂质都易形成镀层结合力不良。因而，操作中减少杂质带入量及经常性的除杂操作都是不行忽视的。此外镀液的工艺参数都应定时分析调整至适合范围。
文章源自：无氰碱铜 http://www.newstar-china.com
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