Corrosion behavior of Zn, Zn-Mg-Al, and Al-Si alloy coated steel sheet in a simulated marine environment
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In this study, we investigated the corrosion behaviors of Zn, Zn-Mg-Al, and Al-Si alloy coatings in a simulated marine environment. Through a combination of electrochemical testing, immersion corrosion experiments, and salt spray tests, it was found that the Zn coatings exhibited inferior corrosion resistance owing to the formation of a porous corrosion layer predominantly composed of ZnO corrosion products, whereas the Al-Si coatings demonstrated superior protective properties, which was attributed to the development of a more effective barrier layer consisting of large, plate-like Al-based oxides. The results showed that the corrosion products formed on each coating significantly influenced the corrosion behavior. Notably, although the corrosion products formed on both Znbased coating systems, such as the Zn and Zn-Mg-Al coatings, were almost similar, they exhibited markedly different corrosion rates, which can be attributed to variations in the time and quantity of ZnO corrosion product formation. The presence of ZnO appears to inhibit the formation of the dense protective corrosion product, Zn5(OH)6(CO3)2, gradually making the corrosion-product layer more porous. In contrast, the superior corrosion resistance exhibited by the Al-Si coating can be attributed to the formation of large plateshaped Al-based oxides, which provide a more effective barrier against corrosive environments.
Abstract
In this study, we investigated the corrosion behaviors of Zn, Zn-Mg-Al, and Al-Si alloy coatings in a simulated marine environment. Through a combination of electrochemical testing, immersion corrosion experiments, and salt spray tests, it was found that the Zn coatings exhibited inferior corrosion resistance owing to the formation of a porous corrosion layer predominantly composed of ZnO corrosion products, whereas the Al-Si coatings demonstrated superior protective properties, which was attributed to the development of a more effective barrier layer consisting of large, plate-like Al-based oxides. The results showed that the corrosion products formed on each coating significantly influenced the corrosion behavior. Notably, although the corrosion products formed on both Znbased coating systems, such as the Zn and Zn-Mg-Al coatings, were almost similar, they exhibited markedly different corrosion rates, which can be attributed to variations in the time and quantity of ZnO corrosion product formation. The presence of ZnO appears to inhibit the formation of the dense protective corrosion product, Zn5(OH)6(CO3)2, gradually making the corrosion-product layer more porous. In contrast, the superior corrosion resistance exhibited by the Al-Si coating can be attributed to the formation of large plateshaped Al-based oxides, which provide a more effective barrier against corrosive environments.
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