Environmental corrosion resistance of porous TiAl intermetallic compounds  

作　　者：郑治 江垚 董虹星 汤烈明 贺跃辉 黄伯云 

机构地区：[1]State Key Laboratory of Powder Metallurgy, Central South University [2]The Third Xiangya Hospital, Central South University

出　　处：《中国有色金属学会会刊：英文版》2009年第3期581-585,共5页Transactions of Nonferrous Metals Society of China

基　　金：Projects(20636020, 20476106 and 50825102) supported by the National Natural Science Foundation of China;Project(2003CB615707) supported by the National Basic Research Program of China;Project(2006AA03Z511) supported by the Hi-tech Research and Development Program of China;Project(50721003) supported by the Creative Research Group of National Natural Science Foundation of China

摘　　要：Porous TiAl intermetallic compound, as a novel substitute for current inorganic porous material, offsets the shortages of both ceramics and metals. The environmental corrosion resistance of porous TiAl intermetallic compound was investigated. The kinetic equation for the cyclic oxidation of porous TiAl alloy at 600 ℃ is determined to be △m2=1.08×10-5t. After total oxidation of 140 h, porous TiAl intermetallic compound shows more stability of pore structure and the mass gain of TiAl alloy is 0.042 g/m2, which is only 10.6% that of porous 316L stainless steel. The kinetic equation for the cyclic corrosion behavior of porous TiAl alloy in hydrochloric acid with pH=2 at 90 ℃ is determined to be △m2=5.41×10-5t-2.08×10-4. After 50 h exposure, the mass loss of TiAl alloy is 0.049 g/m2, which is only 14.8% and 5.57% that of porous Ti and stainless steel, respectively. The kinetic equation in hydrochloric acid with pH=3 is determined to be △m2=2.63×10-6t-3.72×10-6.Porous TiAl intermetallic compound, as a novel substitute for current inorganic porous material, offsets the shortages of both ceramics and metals. The environmental corrosion resistance of porous TiAl intermctallic compound was investigated. The kinetic equation for the cyclic oxidation of porous TiAl alloy at 600℃ is determined to be Am2 1.08 × 10 st. After total oxidation of 140 h, porous TiAl intermetallic compound shows more stability of pore structure and the mass gain of TiAl alloy is 0.042 g/m^2, which is only 10.6% that of porous 316L stainless steel. The kinetic equation for the cyclic corrosion behavior of porous TiAl alloy in hydrochloric acid with pH 2 at 90℃ is determined to be Am2 5.41 × 10^-5s-2.08× 10^-4. After 50 h exposure, the mass loss of TiAl alloy is 0.049 g/m^2, which is only 14.8% and 5.57% that of porous Ti and stainless steel, respectively. The kinetic equation in hydrochloric acid with pH=3 is determined to be Δm^2=2.63 × 10^-6t-3.72 × 10^-6.

关 键 词：TIAL金属间化合物 多孔材料 环境 TIAL合金 316L不锈钢 耐腐蚀 动力学方程 循环氧化 

分 类 号：TG174[金属学及工艺—金属表面处理]