ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 16    No. 3    June 2006

    
Effect of nanocrystallization on hot corrosion resistance of Ti-48Al-8Cr-2Ag alloy in molten salts
XI Yan-jun(席艳君)1, 2, LU Jin-bin(卢金斌)1, WANG Zhi-xin(王志新)1,
HE Lian-long(贺连龙)3, WANG Fu-hui(王福会)2
(1. Department of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China;
2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research,Chinese Academy of Sciences, Shenyang 110016,China;
3. Shenyang National Laboratory for Materials Sciences,Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
)
Abstract: Magnetron-sputter deposition was used to produce Ti-48Al-8Cr-2Ag coating on a cast alloy substrate with the same composition. Hot corrosion was carried out in molten (Na,K)2SO4 and Na2SO4+NaCl at 900 ℃. The sputtered nanocrystalline coating shows much better hot-corrosion resistance in molten (Na,K)2SO4 as a result of the formation of a continuous and compact Al2O3 scale. The nanocrystallization of TiAlCrAg alloy prolongs the incubation of breakaway corrosion and improves the hot-corrosion resistance of TiAlCrAg alloy in molten Na2SO4+NaCl. The relevant corrosion mechanism was discussed.
Key words: Ti-48Al-8Cr-2Ag alloy; magnetron sputter; nanocrystallization; hot corrosion; oxide scale
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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