Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 11 No. 5 October 2001|
Ni-B-SiC composite coatings
（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