金属间化合物NiAlFe在O_2/SO_2/SO_3气氛中的低温热腐蚀行为研究  

LOW TEMPERATURE HOT CORROSION OF NiAlFe INTERMETALLIC COMPOUND IN O_2/SO_2/SO_3 ATMOSPHERE

作　　者：沈华清[1] 曾潮流[1] 楼翰一[1] 王福会[1] 郭建亭[2] 吴维 

机构地区：[1]中国科学院金属腐蚀与防护研究所腐蚀科学开放研究实验室,沈阳110015 [2]中国科学院金属研究所,沈阳110015

出　　处：《腐蚀科学与防护技术》1993年第3期181-186,共6页Corrosion Science and Protection Technology

基　　金：国家自然科学基金;国家高技术结构材料专家委员会联合资助

摘　　要：本文运用热重法对NiAlFe金属间化合物在O_2-0.5%(SO_2+SO_3)气氛中于600-750℃的温度范围内由(Na,K)+2SO_4引起的低温热腐蚀进行了动力学研究。采用扫描电镜、化学分析、金相、电子探针及X射线衍射等传统方法对腐蚀产物进行了分析。结果表明,NiAlFe发生了严重的低温热腐蚀,随温度升高腐蚀速度加快。热腐蚀的发生主要归因于多元共晶盐液相的形成。CoCrAlY涂层能改善合金的耐蚀性能。The hot corrosion kinetics of NiAlFe (4at%Mo) in the presence of a film of 2mg/cm^2 of (Na,K)_2SO_4 (molar ratio, 2:1) in latm O_2 / SO_2/SO_3 atmosphere over the temperature range 600℃～750℃ has been studied. The products were examined with SEM, chemical analysis, metallography, electron microprobe and X-ray diffraction techniques. In general, rapid corrosion occurs by formation of eutectic of Ni-Fe-Na-K sulfates melt of MoO_3-(Na,K)_2MoO_4 melt. The higher the test temperature is the heavier corrosion occurred . Moreover, CoCrAlY coating is effective to improve the hot corrosion resistance of NiAlFe intermetallic compound, though it still suffers from low temperature hot corrosion.

关 键 词：NiAlFe 热腐蚀 硫酸盐 金属互化物 

分 类 号：TG172.82[金属学及工艺—金属表面处理]