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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 1    February 2004

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Effect of borate coating on corrosion resistance of
pure nickel in molten LiCl-Li2O
LIU Rui-yan(刘瑞岩), WANG Xu(王 旭), ZHANG Jun-shan(张俊善),
WANG Xiu-min(王秀敏), ZHU Mei-Li(祝美丽)

Department of Materials Engineering, Dalian University of Technology, Dalian 116024, China

Abstract:The pack boriding process was used to treat pure nickel at a boriding temperature of 950℃for a boriding time of 5 h. A dense and continuous borided layer with 40μm thickness was obtained on pure nickel. Corrosion behavior of the borided layer was investigated in molten LiCl-10%Li2O(mass fraction) at 750℃in air. The mass loss of the boriding coating was 8.4 mg·cm-2after being corroded for 50 h in the melt, which is about three times lower than that of unborided pure nickel. The preferential corrosion of B in borided layer effectively prevents the corrosion of nickel, which improves the corrosion resistance of pure nickel in molten LiCl-Li2O.

 

Key words: pure nickel; borided nickel; molten LiCl-Li2O; corrosion

ISSN 1672-7029
CN 43-1423/U

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