氨基磺酸体系Co-Ni 合金电化学共沉积行为及动力学机理.PDF

19 1 No.1 Vol.19 2005 2 Journal of Chemical Engineering of Chinese Universities Feb. 2005 : 1003-9015(2005)01-0048-06 Co-Ni , , ( 150001) (EIS), Co-Ni Co-Ni Co2+ Ni NH SO − 2 3 Co2+ NH SO -Ni2+ 2 3 (CFSE), Co2+ Ni2+ Co2+ , EIS Co-Ni Co-Ni ; ; ; TF111.521 TG146.16 A Electrochemical Anomalous Codeposition of Co-Ni Alloys from Sulfamate Electrolytes and its Mechanism WU Gang, LI Ning, ZHOU De-rui (Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China) Abstract: The anomalous codeposition behavior of Co-Ni alloys from sulfamate electrolytes containing various Co2+/Ni2+ ratios was investigated by steady polarization curves and electrochemistry impedance spectroscopy (EIS) measurements. It was demonstrated that the electrochemical behavior of Co-Ni alloy deposition from sulfamate electrolytes was different significantly from that of from other electrolytes such as chloride or sulfate solutions. It is believed that the codeposition of CO-Ni alloys is inhibited by the adsorption of heteronuclear complexes on the electrode surface and the complexes are formed by the sulfamate anion as the bidentate ligand. From the standpoint of crystal-field theory, high-spin cobalt complexes with higher energy are less stable than that of nickel. Therefore the inhibition of sulfamate anion t