The Comparison of Brass-Electrodeposition Techniques between Direct and Pulse Current Without Cyanide
Keywords:
Electroplating, Cyanide, Brass, Pulse Current, Corrosion resistanceAbstract
Generally, the electrodeposition of Cu-Zn alloy or brass coating mostly uses a cyanide electrolyte in the manufacturing process. As the coating surface of the product is good quality by cyanide solution, it has led to being popular in the industries. The cyanide-containing electrolyte solution is not only dangerous to human health and the environment but also includes the cost increasing from machine maintenance. It stems from the cyanide toxicity. Therefore, this work aims to study the brass-electrodeposition technique with the cyanide-free solution. The comparison between direct current (DC) and pulse current (PC) is investigated in the plating process that the duty cycle of PC is determined as 33%, 50% and 67% respectively. The results of studies and comparisons of electrodeposition technique pulse current at 33% of duty cycle resulted in the smallest coating layer grain size. The hardness of the coating layer is the highest. It also results in the highest corrosion resistance of the coating layer.
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