Study On Process Of Producing Stannous Methanesulfonate By Electrolytic Method And Its Performance

With the rapid development of industry, there is a growing concern about the safety, stability and environmental protection of electroplating solution. In recent tin plating industry, the methanesulfonate system has opened up a new area. This bath is stable, low toxicity, low corrosion, high-quality coatings and can be used at a high current density edge. It is environment-friendly due to its bildegradability, so the stannous methanesulfonate has a great potential in the future industry development.The current preparation methods of stannous methanesulfonate show some disadvantages, such as low yield, poor product quality, environmental pollution, and the developing of new synthetic method will make.great.significant contributions.to.the. production application of stannous.methanesulfonate. Electrolysis as an efficient environment-friendly preparation method is widely used in modern industry. The method presents some advantages, such as less pollution, less investment and high efficiency, etc., and a very high market competitiveness. The aim of the paper is to prepare stannous methanesulfonate by electrolysis and study its performances.In this paper based on the basic reaction theory a pilot program was developed. To examine the current density the single factor experiment was carried, and MSA concentration, system temperature, stirring rate and dosage of anti-oxidant had effects on the synthesis reaction. The better synthesis conditions were further optimized by a uniform testing, from which the regression equation was established to reveal the main synthesis conditions and provide a theoretical basis for the preparation of high purity stannous methanesulfonate by electrolytsis. The IR analysis confirmed that the product of this synthesis process is stannous methanesulfonate, and the product yield can reach 99.4% when optimial process conditions were adopted.Based on the synthesis conditions the thermal stability and oxidation resistance of stannous methanesulfonate were investigated. Compared with the stannous methanesulfonate prepared by traditional chemical method, the one prepared by the electrolysis presented better thermal stability and higher resistance to oxidation. Because the stannous methanesulfonate solution is easily oxidized with a silghtly yellow or yellow color, the minimum dosage of antioxidants can be determined to analyst the oxidation and hydrolysis behavior of stannous methanesulfonate. The results of our experiment has an important guide to preservation correctly.Under optimial process conditions the apparent kinetics of the reaction was preliminarily studied, and through electrochemical experiments the affecting factors of the anodic dissolution rate at different concentrations of MSA, including system temperature and stirring rate, were investigated. By the Arrhenius equation the pre-exponential factor and the apparent activation energy of the reaction were calculated; and by Tafel formula the apparent mass transfer coefficient(β=0.22) and exchange current density (i0=1.012×10-3A·cm-2 ) of electrochemical kinetic parameters were also calculated.