Additive effects on tin electrodepositing in acid sulfate electrolytes  

作　　者：Fa-xin Xiao Xiao-ni Shen Feng-zhang Ren Alex A. Volinsky 

机构地区：[1]School of Materials Science and Engineering,Henan University of Science and Technology [2]Department of Mechanical Engineering,University of South Florida

出　　处：《International Journal of Minerals,Metallurgy and Materials》2013年第5期472-478,共7页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.50904023);the Natural Science Research Project of the Education Department of Henan Province(No.2010B450001);the Innovation Scientists and Technicians Troop Construction Projects of Henan Province(No.104100510005);the Basic and Frontier Technologies Research Projects of Henan Province,China(No.092300410064)

摘　　要：The effects of additives on the stannous reduction of an acid sulfate bath were investigated using cyclic and linear sweep voltammetry, electrochemical impedance spectroscopy （EIS）, and microstructure analysis. In the absence of additives, tin coatings are rough, and the tin electrodepositing is a single-step reduction process accompanied by hydrogen gas evolution. The addition of tartaric acid produces a slight reduction in the peak current of stannous reduction and has an appreciably positive effect on the stability of the acidic tin bath. Both benzylidene acetone and polyoxyethylene octylphenol ether hinder the stannous reduction and greatly suppress the hydrogen gas evolution. Formaldehyde slightly decreases the peak current density of stannous reduction and serves as an auxiliary brightener in the acid sulfate bath. The presence of mixed additives greatly suppresses the stannous reduction and hydrogen gas evolution and consequently produces a significantly smoother and denser tin coating. The （112） crystal face is found to be the dominant and preferred orientation of tin deposits.The effects of additives on the stannous reduction of an acid sulfate bath were investigated using cyclic and linear sweep voltammetry, electrochemical impedance spectroscopy （EIS）, and microstructure analysis. In the absence of additives, tin coatings are rough, and the tin electrodepositing is a single-step reduction process accompanied by hydrogen gas evolution. The addition of tartaric acid produces a slight reduction in the peak current of stannous reduction and has an appreciably positive effect on the stability of the acidic tin bath. Both benzylidene acetone and polyoxyethylene octylphenol ether hinder the stannous reduction and greatly suppress the hydrogen gas evolution. Formaldehyde slightly decreases the peak current density of stannous reduction and serves as an auxiliary brightener in the acid sulfate bath. The presence of mixed additives greatly suppresses the stannous reduction and hydrogen gas evolution and consequently produces a significantly smoother and denser tin coating. The （112） crystal face is found to be the dominant and preferred orientation of tin deposits.

关 键 词：electrodepositing TIN ADDITIVES stannous reductiOn 

分 类 号：O646[理学—物理化学]