일상 생활용수 내 Zn-Al-Mg계 합금도금강재의 부식거동
Corrosion Behavior of Zn-Al-Mg Alloy Coated Steel Exposed to Residential Water
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초록
The objective of this study was to evaluate corrosion resistance of Zn-Al-Mg alloy coated steel in residential water with trace quantities of Cl - . Comparative evaluations were performed using two commercial coated steel products, GI and Galvalume, as reference samples. Examination of corrosion morphology and measurement of weight loss revealed that the Zn-Al-Mg alloy coated steel exhibited higher corrosion resistance than reference samples. This finding suggests that the alloy coated steel possesses long-term corrosion resistance not only in highly Cl - concentrated environments such as seawater, but also in environments with extremely low levels of Cl - found in residential water. The primary factor contributing to the superior corrosion resistance of the Zn-Al-Mg alloy coated steel in residential water is the formation of an inhib-iting corrosion product composed primarily of two phases: Zn 5 (OH) 6 (CO 3 ) 2 and Zn 5 (OH) 8 Cl 2 ·H 2 O. Thepreferential dissolution of Mg from the corroded coating layer can increase alkalinity, which mightenhance the thermodynamical stability of Zn 5 (OH) 6 (CO 3 ) 2 .
Abstract
The objective of this study was to evaluate corrosion resistance of Zn-Al-Mg alloy coated steel in residential water with trace quantities of Cl - . Comparative evaluations were performed using two commercial coated steel products, GI and Galvalume, as reference samples. Examination of corrosion morphology and measurement of weight loss revealed that the Zn-Al-Mg alloy coated steel exhibited higher corrosion resistance than reference samples. This finding suggests that the alloy coated steel possesses long-term corrosion resistance not only in highly Cl - concentrated environments such as seawater, but also in environments with extremely low levels of Cl - found in residential water. The primary factor contributing to the superior corrosion resistance of the Zn-Al-Mg alloy coated steel in residential water is the formation of an inhib-iting corrosion product composed primarily of two phases: Zn 5 (OH) 6 (CO 3 ) 2 and Zn 5 (OH) 8 Cl 2 ·H 2 O. Thepreferential dissolution of Mg from the corroded coating layer can increase alkalinity, which mightenhance the thermodynamical stability of Zn 5 (OH) 6 (CO 3 ) 2 .
참고문헌 (12)
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