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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 5    October 2001

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Thermodynamics of electrodeposited
Ni-B-SiC composite coatings
GUO Zhong-cheng(郭忠诚),  ZHU Xiao-yun(朱晓云),  YANG Xian-wan(杨显万)

School of Material and Metallurgy Engineering,
Kunming University of Science and Technology,Kunming 650093, P.R.China

Abstract: The φ-pH diagram of Ni-B-H2O system was drawn, and the mechanism of electrodepositing Ni-B-SiC composite coatings was discussed. The results show that the deposition of Ni and B occurs prior to that of H2 because of the over-potential of H2 evolution on the Fe substrate. Boron can not singly deposit in aqueous solution. Nickel and boron can co-deposit in the form of Ni4B3 without evolution of hydrogen when the cathodical potential is kept to be -1.415~-1.700V.

 

Key words:  Ni-B-SiC composite coating; φ-pH diagram; electrodeposition

ISSN 1672-7029
CN 43-1423/U

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