Ni_3Al材料在O_2/SO_2/SO_3气氛中的低温热腐蚀行为  

SULPHATES-INDUCED HOT CORROSION OF Ni_3Al INO_2/SO_2/SO_3 ATMOSPHERE

作　　者：沈华清[1] 曾潮流[1] 吴维 郭建亭[2] 

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 [2]中国科学院金属研究所

出　　处：《金属学报》1993年第10期B450-B454,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金委员会和高技术新材料专家委员会联合资助项目

摘　　要：用涂盐法并借助扫描电镜、光谱分析,金相,电子探针及X射线衍射等技术研究了Ni_3Al金属间化合物在O_2/SO_2/SO_3气氛中600-800℃温度范围内(Na,K)_2SO_4引起的低温热腐蚀行为结果表明,Ni_3/Al发生了低温热腐蚀。The short-time hot corrosion kinetics of Ni_3Al in the presence of a salt film (about 2mg/cm^2 (Na,K)_2SO_4) in O_2-0.5%(SO_2+SO_3) atmosphere at temperature range of 600--850℃ has been studied by thermal gravimetry, chemical analysis, X-ray diffraction, metallography and SEM. Low temperature hot corrosion occured in Ni_3Al due to the forma- tion of liquidNi-Na-K sulphate eutectic phase. The corrosion rates reached maximum at 750℃ in the condition mentioned above. Moreover, the effects of O_2/SO_2/SO_3 gas, salt film and CoCrAlY coating on the hot corrosion behavior of Ni_3Al have also been investigated. The salt film may accelerate the oxidation of Ni_3Al in air, and CoCrAlY coating may improve the corrosion resistance of Ni_3Al in same environment.

关 键 词：金属互化物 NI3AL 腐蚀 

分 类 号：TG111[金属学及工艺—物理冶金]