在我国，由于行政上的原因，无氰碱性镀铜工艺以往都集中在单一镀种的研究开发上，而围绕其大规模生产运用的相关工艺支持却甚少，从而限制了它的推广 应用。尤其锌压铸件无氰碱性镀铜后的结合力问题一直得不到有效解决。我们通过实验和生产应用，在锌合金压铸件上采用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，为进一步推广无氰碱铜工艺积累了有益的经验。
In our country, due to administrative reasons, cyanide free alkaline copper plating process has always been focused on the research and development of a single plating species, but there is little support for its large-scale production and application, which limits its popularization and application. In particular, the binding force of zinc die casting after cyanide free alkaline copper plating has not been effectively solved. Through experiments and production application, sf-628 cyanide free alkaline copper plating process and our company's pre-treatment process are adopted in zinc alloy die casting, and excellent adhesion is obtained, which has accumulated useful experience for further promotion of cyanide free alkaline copper plating process.
The way to improve the adhesion of sf-628 cyanide free alkaline copper plating
我们知道，氰化镀铜液中所含氰化物是一种极强的络合剂，同时又是一种极有效的去垢活化剂，它能在相当程度上弥补锌合金压铸件前处理中的不良实施，电镀时氰 化镀铜液甚至能渗镀到基材表面极细微的缩孔、晶间间隙中，相比之下，SF-628无氰碱铜不含强螯合剂，因此更容易导致锌压铸件结合力不良现象发生。而要 提高其结合力，结合国内的成功经验我们认为从以下几个方面入手：
We know that cyanide contained in cyanide copper plating solution is a very strong complexing agent, and also a very effective detergent activator, which can compensate for the poor implementation of pretreatment of zinc alloy die casting to a certain extent. Cyanide is used in electroplating In contrast, sf-628 cyanide free alkaline copper does not contain strong chelator, so it is more likely to lead to poor adhesion of zinc die casting. In order to improve its combining ability, we should start from the following aspects in combination with domestic successful experience:
1. Improve the electroplating applicability of zinc die casting substrate: This includes the selection of qualified high-quality alloy composition of zinc aluminum casting, advanced mold manufacturing and casting process, reliable grinding and polishing process and other high-density surface finish workpieces, which can effectively improve the adhesion of zinc aluminum casting surface coating.
2、采用的镀前活化处理工艺：优先选用对锌合金铸件温和、的化学电解脱脂去垢工艺。适当引入阳极电解除油，对提高其结合力有很大的帮助，采用阳极 电解除油可有效消除以往阴极电解除油因析氢造成的锌压铸件镀层起泡。其次，合适的阳极电解除油对零件表面积垢、挂灰等有极佳的去除能力，也能大大提高铜镀 层在锌铸件表面的结合力。
2. High efficient activation treatment process before plating: mild and efficient chemical electrolytic degreasing and descaling process for zinc alloy casting is preferred. The proper introduction of anode electrolytic degreasing is of great help to improve the bonding force. The use of anode electrolytic degreasing can effectively eliminate the blistering of zinc die casting coating caused by hydrogen evolution caused by the former cathodic electrolytic degreasing. Secondly, the proper anode electrolytic degreasing can remove the scale and ash on the surface of the parts, and also can greatly improve the adhesion of the copper coating on the surface of the zinc casting.
3. Strict process management and process control: sf-628 cyanide free alkaline copper plating solution is sensitive to impurities, and excessive accumulation of inorganic and organic impurities are easy to cause poor coating adhesion. Therefore, reducing the amount of impurities in the operation and regular impurity removal operations are not to be ignored. In addition, the technological parameters of the plating solution should be regularly analyzed and adjusted to the best range