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http://dx.doi.org/10.9726/kspse.2017.21.2.014

High Temperature Corrosion Characteristics of Al-Si-Mg Alloy in O2 and H2S/H2 Environments  

Lee, Yeong-Hwan (Department of Material System Engineering, Graduate School, Pukyong University)
Son, Young-Jin (AMC Co., Ltd.)
Lee, Byung-Woo (Department of Material System Engineering, Pukyong University)
Publication Information
Journal of Power System Engineering / v.21, no.2, 2017 , pp. 14-19 More about this Journal
Abstract
The corrosion characteristics of Al-Si-Mg alloy were investigated in $O_2$ and $H_2S/H_2$ environments at high temperature. The weight gain and the reaction rate constant of the Al-Si-Mg alloy were measured in the oxygen and hydrogen sulfide environments at 773K. The weight gain of Al-Si-Mg alloy was showed parabolic increase in the oxygen and hydrogen sulfide environments. The reaction rate constants were confirmed to be $1.45{\times}10^{-4}mg^2cm^{-4}sec^{-2}$ in the oxygen environment and $6.19{\times}10^{-4}mg^2cm^{-4}sec^{-2}$ in the hydrogen sulfide environment respectively. As a result of XPS analysis on the specimen surface, $Al_2O_3$ and MgO compounds were detected in oxygen environment and $Al_2(SO_4)_3$ sulfate was detected in the hydrogen sulfide environment. Corrosion rate of Al-Si-Mg alloy was about 4.3 times faster in hydrogen sulfide environment than oxygen environment.
Keywords
Corrosion characteristic; Al-Si-Mg alloy; Weight gain; Reaction rate constant; $Al_2(SO_4)_3$ sulfate;
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