PROCESS OF SULFATE ACIDIC BRIGHT Sn-Bi ALLOY ELECTROPLATING

The process of acidic Sn-Bi alloy electroplating was developed by Hull cell tests.For improving bright appearance of the electroplated film and stability of the plating solution,the effect of the composition and operating condition on properties of the film and solution was discussed,and properties of the film were tested.The corrosion resistance,welding ability of the alloy coating obtained by adding stabilizer and brighter were excellent and the content of Bi in the coating was 2.5%.The throwing power,covering ability and stability of the bath were good.