플랜트팜용 3원계 (Zn-Al-Mg) 합금도금 강판의국부손상에 따른 부식 메커니즘
Corrosion Mechanism According to Localized Damage of Zn-Al-Mg Alloy Coated Steel Sheet Used in Plant Farm
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This study aimed to evaluate corrosion resistance of steel coated with GI and Zn-Al-Mg alloy using cycliccorrosion test (CCT) with electrochemical polarization and impedance measurements. Results showed thatthe Zn-Al-Mg alloy coated steel had a much higher corrosion rate than GI coated steel in early stages ofcorrosion. With prolonged immersion, however, the corrosion rate of the Zn-Al-Mg alloy coated steelgreatly decreased, mainly owing to a significant decrease in the cathodic reduction reaction and an increasein polarization resistance at the surface. This was closely associated with the formation of protective corrosionproducts including Zn5(OH)8Cl2·H2O and Zn6Al2(OH)16CO3. Moreover, when the steel substrate waslocally exposed due to mechanical damage, the kinetics of anodic dissolution from the coating layer andthe formation of protective corrosion products on the surface of the Zn-Al-Mg alloy coated steel becamemuch faster compared to the case of GI coated steel. This could provide a longer-lasting corrosion inhibitionfunction for Zn-Al-Mg alloy coated steel used in plant farms.
Abstract
This study aimed to evaluate corrosion resistance of steel coated with GI and Zn-Al-Mg alloy using cycliccorrosion test (CCT) with electrochemical polarization and impedance measurements. Results showed thatthe Zn-Al-Mg alloy coated steel had a much higher corrosion rate than GI coated steel in early stages ofcorrosion. With prolonged immersion, however, the corrosion rate of the Zn-Al-Mg alloy coated steelgreatly decreased, mainly owing to a significant decrease in the cathodic reduction reaction and an increasein polarization resistance at the surface. This was closely associated with the formation of protective corrosionproducts including Zn5(OH)8Cl2·H2O and Zn6Al2(OH)16CO3. Moreover, when the steel substrate waslocally exposed due to mechanical damage, the kinetics of anodic dissolution from the coating layer andthe formation of protective corrosion products on the surface of the Zn-Al-Mg alloy coated steel becamemuch faster compared to the case of GI coated steel. This could provide a longer-lasting corrosion inhibitionfunction for Zn-Al-Mg alloy coated steel used in plant farms.
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