During the application of tin plating brightener, the plating layer is always rough, which not only affects the delivery pass rate, but also delays the production schedule. So why does this failure occur? In general there are 6 possibilities, this article we first analyze 2 of the reasons.
High solid impurities in the plating solution
Accumulation of solid impurities in the solution using tin plating brightener can cause rough crystallization and poor brightness of the plated layer, and if the problem is serious, blackening of the plated layer, brittleness, and poor bonding of the plated layer can also occur.
The introduction of solid impurities is mainly through the following ways: dust landing in the workshop; imperfect pre-treatment; anode sludge slag dissolved down from the tin plate and other solid insoluble matter falling into the plating bath. These solid impurities, in the plating process, deposited on the surface of the workpiece and form a rough plating layer
Excessive metal impurities
Copper impurities, iron impurities, arsenic impurities, antimony impurities are harmful impurities in the acid tin plating solution, when it is too much, it will cause the tin plating solution to appear turbid phenomenon, at the same time, the plating layer is rough crystallization, and dark, porous. So where do these metallic impurities come from when using tin brighteners? According to the production experience of Bigelow engineers, there are several sources: corrosion of the workpiece, anodic dissolution, the introduction of chemical materials and so on. If you want to solve the problem, you can use low-current electrolysis to remove them.
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Guangdong Bigely Technology Co., Ltd. ,founded in 2003, is a high-tech enterprise integrating R & D，production, sales and service, specializing in the production of electroplating additives. As a famous electroplating additives source manufacturer in China, our products are widely used to meet the plating needs of different industries and exported to many countries from all over the world. They can meet the environmental protection standard after use, mainly used in automobile parts, sanitary ware, electronic products, hardware, furniture, building accessories and other fields.
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