아연 코팅과 열처리에 따른 알루미늄 열교환기 소재의 부식
Effects of Zn Coating and Heat Treatment on the Corrosion of Aluminum Heat Exchanger Tubes
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The effects of zinc coating and heat treatment on the corrosion resistance of aluminum alloys includingA1100 and the modified A3003, used as heat exchanger tube were investigated in this study. Thegrain size of the heat-treated specimen is larger than that of the specimen without heat treatment,but the grain size did not significantly affect the corrosion behavior. The concentration of zinc wasnoted at 11.3 ~ 31.4 at.% for the as-received Zn-coated samples and reduced to 1.2 ~ 2.4 at.% afterthe heat treatment, as measured by the scanning electron microscopy (SEM) with an energy dispersivespectrometer (EDS) on the surface. The concentration of oxygen is 22 ~ 46 at.% for the zinc coatedspecimens while noted at 7.4 ~ 12.8 at.% for the specimens after the removal of the coating. Thecorrosion behavior depended largely on the concentrations of zinc, aluminum, and oxygen on the specimensurface, but not on the Mo content. The corrosion potential was high and the corrosion rate was lowfor a specimen with a low zinc content, a high aluminum content, and a high oxygen content.
Abstract
The effects of zinc coating and heat treatment on the corrosion resistance of aluminum alloys includingA1100 and the modified A3003, used as heat exchanger tube were investigated in this study. Thegrain size of the heat-treated specimen is larger than that of the specimen without heat treatment,but the grain size did not significantly affect the corrosion behavior. The concentration of zinc wasnoted at 11.3 ~ 31.4 at.% for the as-received Zn-coated samples and reduced to 1.2 ~ 2.4 at.% afterthe heat treatment, as measured by the scanning electron microscopy (SEM) with an energy dispersivespectrometer (EDS) on the surface. The concentration of oxygen is 22 ~ 46 at.% for the zinc coatedspecimens while noted at 7.4 ~ 12.8 at.% for the specimens after the removal of the coating. Thecorrosion behavior depended largely on the concentrations of zinc, aluminum, and oxygen on the specimensurface, but not on the Mo content. The corrosion potential was high and the corrosion rate was lowfor a specimen with a low zinc content, a high aluminum content, and a high oxygen content.
참고문헌 (5)
- R. Davis, "Corrosion of Aluminum and Aluminum Alloys", pp.19~22 (1999), ASM international
- H. S. Kim, "Automotive Materials", pp.89~119 (2000), Wonchang Publishing Co
- M. Zamin, , Corrosion, 37, pp.627~ (1981)
- D. A. Jones, "Principles and Prevention of Corrosion", pp.398~401 (1991), Macmillan Publishing Company
- W. J. Lim, "Corrosion and Corrosion Control of Air Conditioning Eequipment", pp.1~5 (2002), Taehoon Publishing Co