Feasibility study on environment-friendly cadmium plating technology without cyanide
The experiment showed that the dispersing ability and deep plating ability of the cyanide-free cadmium plating solution were excellent.When the current density was 1.16-1.37 A/dm2 and the bath temperature was 22-35 ℃,the deposition rate of cadmium layer was 10.00-16.23 μm/h.The initial appearance of the cadmium layer was tile gray with metallic luster,and when the amount of electricity in the plating solution gradually increased,the appearance of the cadmium layer gradually became silver gray and silver white,and the appearance of the cadmium layer after passivation was rainbow color.The binding force,corrosion resistance and hydrogen brittleness of the cadmium layer met the requirements of HB5036-1992.The appearance and deposition rate of cadmium layer can be guaranteed by adding main salt,conductive salt and additives according to hall chamber test,empirical data and appearance of the cadmium layer.The oxidation phosphating film was prepared on cadmium layer,and the appearance and corrosion resistance of the film met the technological requirements.The test plating effect of small parts was good and met the delivery standard.
cadmium plating without cyanidebath performancecoating propertybath stability
万方数据
维普
