Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


한국표면공학회지 (33권1호 17-24)

Microstructure and Corrosion Characteristics of Al-Si Coated PWA1426 and PWA658 Alloy

Al-Si 코팅된 PWA1426과 PWA658 합금의 미세조직과 고온부식 특성


한려대학교 신소재공학과;국방과학연구소;광주·전남지방 중소기업청;
한려대학교 신소재공학과;국방과학연구소;광주·전남지방 중소기업청;


The microstructures and corrosion properties of Al-Si diffusion coated PWA1426 and PWA658 alloys have been investigated. The coated layer and corrosion properties were analysed by SEM, EDS and hot corrosion test. According to the results of SEM, it is supposed that the coated layers were composed of mixed, denuded and inter-diffusion layer. The coated PWA1426 alloy improved corrosion properties, compared to the PWA658 alloy. Corrosion debris generated during hot corrosion test of PWA658 alloy are identified as NiO, $TiO_2$and $NiAl_2$$O_4$from coated layer which increase oxidation rate and decrease adhesion. The PWA1426 alloy heat treated at $1080^{circ}C$ showed that NiAl and $Al_2$$O_3$formed on coated layer.