In the production process of using sulfate tin plating brightener, sometimes iron impurities will be produced in the plating solution, so what effect does iron impurities have on the plating solution?
Bigolly Technology made an analysis based on the field experience and the characteristics of the product's sulfate tin plating brightener Sn-807,due to the corrosive effect of strong acid bath and pickling solution on steel substrate, ferrous ions will be generated in the bath and accumulated in the plating solution.
When there are more iron ions in the plating solution, the corrosion resistance, weldability and gloss of the coating will be greatly reduced.At the same time, iron ions catalyze the conversion of divalent tin ions in the plating solution to tetravalent tin ions, which makes the plating solution turbid, greatly reduces the performance of the plating solution, and causes pinholes and roughness on the surface of the plating layer.
Therefore, it is very important to effectively remove the interference of iron ions in the plating solution to ensure the quality of the tin plating layer.The methods of removing iron ion impurities from tin plating solutions include electrolysis, precipitation, redox, ion exchange resin and selective adsorption.Since iron and tin are adjacent in the metal activity sequence table, the solubility product constants of the divalent and tetravalent hydroxides of tin are much smaller than those of the corresponding iron divalent and trivalent hydroxides.Therefore, some tin ions are also lost while processing iron impurities.
Therefore, in the production process of using sulfate tin plating brightener, we should regularly remove iron impurities in the plating solution to ensure the stable performance of the plating solution and effectively reduce the occurrence of failures.If you are interested in sulfate tin plating brightener, please contact Bigolly customer service to get free samples and detailed technical information!
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