Lead a green gray metal, standard REDOX potential E ° (Pb/pb2 +) = 0.126 V. Tin is silvery white metal, the standard REDOX potential E ° (sn/Sn2 +) = 0.136 V, in simple and complex ions in acidic electrolyte, lead tin alloy under the low current density can produce codeposition. Lead tin alloy plating than also lead the thickness of the coating and the tin coating porosity is low. Containing tin, lead 40% 60% lead tin alloy has the lowest melting point 183 ci =, its welding performance than pure tin plating. Therefore, in the aerospace, electronics industry has been widely used.

2 process (brass)

Chemical degreasing a hot wash cold water washing, acid pickling, cold water wash a bright pickling, cold water wash a lead-tin alloy plating - cold water wash a chemical passivation a cold water to wash a hot water wash a ?