The poor solderability of the tin plating layer is not only related to the thickness of the coating, but also due to the acid tin plating brightener.
The influence of the surface finish of the workpiece
One of the most significant factors affecting the weldability of coatings is the surface finish of the workpiece. That is to say, a surface with good finish has better weldability than one with a rough surface. Why is it like this?
This is because the better the smoothness of the base metal, the finer and tighter the crystallization of the coating will be. In addition, the surface of the coating is not clean and is prone to white fog. After high-temperature aging, the weldability of the coating deteriorates.
Treatment method: If the surface of the workpiece is found to be rough upon receiving the material, it needs to be polished before electroplating.
The influence of aging plating solution
The solderability of the tin coatings plated by the old plating solution and the newly prepared plating solution was compared and tested. The results showed that the workpieces plated by the newly prepared plating solution had better solderability.
The reason lies in the fact that there are many decomposition products in the old plating solution (caused by poor quality of tin plating brightener). When the plating layer contains too many decomposition products, it will affect its solderability.
The influence of brightener performance
Although different brighteners can all produce tin coatings with the same brightness, their soldering properties vary greatly. Therefore, brighteners should be selected reasonably.
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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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