In the production process of using sulfate mist tin additives, sometimes there may be poor coverage of the coating, which affects the quality of the coating. What is the reason for this?
Bigely Technology has conducted an analysis based on on-site experience and product characteristics, mainly for the following four reasons:
1.The concentration of stannous sulfate is too high. Tin sulfate is the main salt of the plating solution, which can increase the cathode current density and accelerate the deposition rate within the allowable range. But if the concentration is too high, the coverage ability of the plating solution will decrease, the coating color will be darker, the crystallization will be rough, and the bright area will shrink.
2.The concentration of sulfuric acid is too low. Sulfuric acid has the functions of preventing stannous hydrolysis, reducing stannous ion activity, improving plating solution conductivity, and enhancing anode current efficiency. When the concentration of sulfuric acid is too low, stannous ions are prone to oxidation into tetravalent tin, which prevents the plating solution from becoming turbid and reduces the coverage of the coating.
3.The concentration of fog tin additive is too low. Mist tin additives have the effect of improving cathodic polarization, refining coating crystallization, and enhancing the dispersion ability of plating solution. When the concentration of fog tin additive is too low, the dispersion ability of the plating solution is poor, and the coverage ability of the coating will deteriorate.
4.The temperature of the plating solution is too high. During production, the temperature of the plating solution should be controlled within the process range. When the temperature is too high, the plating solution is prone to turbidity and precipitation, the coating is rough, the coating coverage is poor, and problems such as darkening, flower formation, and decreased weldability may occur.
So, we need to pay attention to the above four points in the production process, which can prevent the problem of poor coating coverage and better use of sulfate mist tin additives. If you are interested in sulfate mist tin additives, please contact Bigely customer service for free samples and detailed technical information!
