多孔TiAl金属间化合物的抗热盐酸腐蚀性能  

Corrosion resistance of porous TiAl alloy in hot hydrochloric acid solution

作　　者：武治锋[1] 贺跃辉[1] 江垚[1] 汤烈明[1] 黄伯云[1] 徐南平[2] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]南京工业大学膜科学技术研究所,南京210009

出　　处：《粉末冶金材料科学与工程》2007年第5期310-315,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划(973计划)资助项目(2003CB615707);国家自然科学基金资助项目(20476106);国家自然科学基金重点项目(20636020)

摘　　要：以Ti、Al元素粉末为原料,用粉末冶金法制备Al含量为35%(质量分数)的多孔TiAl金属间化合物。通过腐蚀动力学曲线、孔结构参数与表面形貌变化来研究在90℃恒温条件下,多孔TiAl在pH为2和3的盐酸溶液中的耐腐蚀性能,并对多孔TiAl与多孔钛、多孔镍以及多孔不锈钢在pH=2时的耐腐蚀性能进行比较。结果表明,当pH值由3减小到2时,多孔TiAl的耐腐蚀性能略有下降,但仍明显优于其他3种多孔材料。分析认为,多孔TiAl的优良耐蚀性能主要归因于钛铝金属间化合物特殊的键合特征以及Ti、Al元素的强钝化能力。Porous TiAl alloy （35%A1） was fabricated with titanium and aluminum powders by P/M technique. Influence of acidity on corrosion resistance of porous TiAI alloy was studied in hydrochloric acid solution when pH value changed from 2 to 3 at 90 ℃. Corrosion resistance of porous TiAI alloy was compared with that of porous titanium, porous nickel and porous stainless steel when pH=2. Corrosion resistance of porous material was characterized by corrosion kinetic curves, change of pore structure and surface morphology. Results showed that corrosion resistance of porous TiAI alloy is descended a little when pH value is adjusted from 3 to 2, but is superior to the others. It was analysed that the well corrosion resistance of porous TiAI alloy was due to the particular bonding character of TiAI intermetallics and the obvious passivity of titanium and aluminum element.

关 键 词：TiAI金属问化合物 多孔材料 盐酸腐蚀 

分 类 号：TG172.6[金属学及工艺—金属表面处理]