Effect of borate coating on corrosion resistance of
pure nickel in molten LiCl-Li2O①
pure nickel in molten LiCl-Li2O①
(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