Mechanism of zinc electroplating in alkaline zincate solution
来源期刊：中南大学学报(英文版)2007年第1期
论文作者：彭文杰 王云燕
文章页码：37 - 37
Key words：Zn electroplating; mechanism; alkaline; zincate
Abstract: The cathodic deposition properties and mechanism of Zn in alkaline zincate solution were studied by electrochemical techniques. The results show that Zn2+ exists in the alkaline solution in the form of Zn(OH)42－. The apparent activation energy of the electrode reaction is 38.93 kJ/mol, which indicates that the discharge of Zn(OH)42－ on cathode is controlled by electrochemical polarization, and accompanied by a preceding chemical reaction. The diffusion coefficient of Zn(OH)42－ is 2.452×10－6 cm2/s. Zn(OH)2 is the species directly discharged on the cathode surface. Based on the above results the mechanism of zinc electroplating in alkaline zincate solution was put forward. The discharged species is Zn(OH)2 formed from the preceding chemical reaction, which becomes Zn(OH)ad when gaining one electron, and then gaining the second electron to become Zn. The first electron gaining step is rate determining one.
基金信息：the National Natural Science Foundation of China
