With the development of production technology in the electronic component industry, people have higher requirements for coating quality, and the requirements for product coating thickness, uniformity, hardness and brightness are higher.However, the ordinary tin plating process can not meet the needs of production, and the product performance is difficult to meet the requirements, which requires the use of high-speed tin plating additives.
When high-speed tin-plating additives are used, compared with ordinary tin-plating processes, high current density is required to ensure that the composition of the electrochemical reaction on the electrode surface is carried out.Therefore, the components and process parameters in the plating solution are quite different from the ordinary tin plating process.Taking Bigolly's high-speed tin-plating additives Sn-819 as an example, the parameters of each component of the plating solution mainly include the following four points:
1. Methanesulfonic acid:In the plating solution, it provides a strong acid stable medium for soluble tin salt, and the complexation effect is not obvious. In order to maintain the stability of Sn2+, the plating solution needs to contain a certain amount of free methanesulfonic acid, which is generally controlled at about 140ml/L.
2. Tin methanesulfonate:It is the main salt in the plating solution.When using the Sn-819 process, the lower limit of tin methanesulfonate should be controlled at 50ml/L in order to save costs.
3. Sn-819A softener:It can be used to refine the crystallization of the coating layer, expand the range of bright current density, and improve the conductivity and stability of the plating solution at the same time.Sn-819A softener is mainly consumed by taking out, and the consumption rate is between 0.2~0.3L/1000KAH.
4. Sn-819B brightener: It is the main substance to maintain the brightness of the coating. In the production process, Sn-819B brightener is mainly consumed by electrolysis and take-out, and the consumption is between 0.1~0.2L/1000KAH.
Therefore, in our production process using high-speed tin plating additives, the content of each component of the plating solution will affect the stability of the plating solution and the quality of the product.Controlling the process parameters of each component of the plating solution can maintain the stability of the plating solution and reduce the occurrence of failures.If you are interested in high-speed tinning additives, please contact Bigolly customer service, you can get free samples and detailed technical information!
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