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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 1    February 2002

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Properties of electrodeposited Ni-S(La) coatings
HAN Qing(韩  庆),WEI Xu-jun(魏绪钧),CHEN Jian-she(陈建设)

School of Materials & Metallurgy,Northeastern University,
Shenyang 110004,China

Abstract:Ni-S(La) coatings were obtained by electrodeposition in a typical Watt bath by adding CS(NH2)2 and LaCl3. The minimum HER overpotential is 75mV. The corresponding electrochemical parameters (Tafelslope b,exchanging current density J0) were obtained by measuring the steady-state polarization curves. The content of S, La in the coating and its structure were measured by EPMA and XRD. The results show that there is no lanthanum in such coating and its structureis amorphous. From the anodic polarization curves, it is shown that the corrosion resistance of coating is very good. Based on the cathodic polarizatio n curves during electrodeposition, it is found that LaCl3 is benefit for amorphous coating structure to form.

 

Key words: rare earth; electrodeposition; Ni-S alloy; HER

ISSN 1672-7029
CN 43-1423/U

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