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.
出处
《腐蚀科学与防护技术》
CAS
CSCD
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
