... free Black Tin Alloy Plating 10% Cobalt containing of the previous tech ... . Pure black, without blue or yellow 707(2x) Nickel-free Black Tin Alloy plating ... electroplating processing, such as high content of cobalt, unsteadiness, leaded and the shortcoming of ... current efficiency and completes plating quickly, for example, barrel plating usually just needs 5-6minutes ...