Mechanism of current efficiency improvement of Zn-Fe alloy electroplating by hydrogen inhibitor  

作　　者：王云燕 柴立元 

机构地区：[1]School of Metallurgical Science and Engineering,Central South University

出　　处：《Journal of Central South University of Technology》2007年第3期336-339,共4页中南工业大学学报（英文版）

基　　金：Projects(50274073) supported by the National Natural Science Foundation of China

摘　　要：The effect of hydrogen inhibitor on partial current densities ofZn, Fe and differential capacitance of electrode/electrolyte interface, and adsorbing type of hydrogen inhibitor were studied by the methods of electrochemistry. The mechanism of current efficiency improvement were explained from the point of valence electron theory. The results indicate that the partial current density of Fe increases in addition of hydrogen inhibitor, which reaches the maximum of 0.14 A/dm^2 when current density is 0.2 A/din〈 Differential capacitance of electrode/electrolyte interface decreases obviously from 20.3μF/cm^2 to 7 μF/cm^2 rapidly with the concentration varying from 0 to 20 mL/L, because hydrogen inhibitor chemically adsorbs on active points of Fe electrode surface selectively. Element S in hydrogen inhibitor with negative electricity and strong capacity of offering electron shares isolated electrons with Fe. The adsorption of H atom is inhibited when adsorbing on active points of Fe electrode surface firstly, and then current efficiency of Zn-Fe alloy electroplating is improved accordingly.The effect of hydrogen inhibitor on partial current densities of Zn, Fe and differential capacitance of electrodeelectrolyte interface, and adsorbing type of hydrogen inhibitor were studied by the methods of electrochemistry. The mechanism of current efficiency improvement were explained from the point of valence electron theory. The results indicate that the partial current density of Fe increases in addition of hydrogen inhibitor, which reaches the maximum of 0.14 Adm2 when current density is 0.2 Adm2. Differential capacitance of electrodeelectrolyte interface decreases obviously from 20.3 μFcm2 to 7 μFcm2 rapidly with the concentration varying from 0 to 20 mLL, because hydrogen inhibitor chemically adsorbs on active points of Fe electrode surface selectively. Element S in hydrogen inhibitor with negative electricity and strong capacity of offering electron shares isolated electrons with Fe. The adsorption of H atom is inhibited when adsorbing on active points of Fe electrode surface firstly, and then current efficiency of Zn-Fe alloy electroplating is improved accordingly.

关 键 词：Zn-Fe alloy electroplating current efficiency hydrogen inhibitor MECHANISM 

分 类 号：TG174.441[金属学及工艺—金属表面处理]