The research and development process of cyanide-free potassium chloride cadmium plating was introduced.The boundary conditions of the process were established according to laboratory experiment and production practice.Cadmium chloride is 25 g/L-35 g/L,potassium chloride 8 g/L-140 g/L,PULIZIER NCC-617 AC complexing agent 100-140 g/L,PULIZIER NCC-617 Base adjuvant 25 mL/L-30 mL/L,PULIZIER NCC-617 Bri brightener 1.5-2.5 mL/L,PULIZIER NCC-617 HCD high zone brightener 5 mL/L-10 mL/L,plating bath temperature is 20 ℃-35 ℃,range of pH is 7-9,the cathode current density 0.5 A/dm2-1.5 A/dm2(can be relaxed to 0.5 A/dm2-2.0 A/dm2),the cathode moves 2-4 m/min,and the anode adopts cadmium plate with cadmium mass fraction ≥ 99.97％.The samples of cyanide-free cadmium plating and chromium-hexavalent color passivation on the surface of steel were prepared in the laboratory,and no white rust was found on the surface of the samples after the neutral salt spray test 20064 h.This process has made great progress in the corrosion resistance of the coating and has a good application prospect.
关键词
无氰镀镉/氯化镉/氯化钾/络合剂/光亮剂/辅助剂/边界条件/镀层耐蚀性
Key words
cyanide-free cadmium plating/cadmium chloride/potassium chloride/complexing agent/brightener/adjuvant/boundary conditions/corrosion resistance of coating
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