Effect of nanocrystallization on hot corrosion resistance of Ti-48Al-8Cr-2Ag alloy in molten salts  

作　　者：席艳君 卢金斌 王志新 贺连龙 王福会 

机构地区：[1]Department of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016,China [2]Department of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China [3]Shenyang National Laboratory for Materials Sciences, Institute of Metal Research, Chinese Acade my of Sciences, Shenyang 110016, China [4]State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016,China

出　　处：《中国有色金属学会会刊：英文版》2006年第3期511-516,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(59971052) supported by the National Natural Science Foundation of China

摘　　要：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.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.

关 键 词：Ti-48Al-8Cr-2Ag 铝合金 磁控溅射 晶化 热腐蚀 熔盐腐蚀 

分 类 号：TB383.1[一般工业技术—材料科学与工程]