Mechanistic study on the cut-edge corrosion behaviors of Zn-Al-Mg alloy coated steel sheets in chloride containing environments
By Lee, Jae-Won; Park, Bo Ra; Oh, Se-Young; Yun, Dae Won; Hwang, Joong Ki; Oh, Min-Suk; Kim, Sung Jin
Published in Corrosion Science
2019
Abstract
To understand the cut-edge corrosion behaviors of Zn-Al-Mg alloy-coated steel better, mechanistic studies with a Zn-MgZn2 eutectic specimen fabricated by a hot-pressing process were conducted using various electrochemical methods, such as the scanning vibrating electrode technique and galvanic corrosion measurements. The results showed that the MgZn2 phase dissolved preferentially with the galvanic current flowing from the phase to Zn. Mg/Zn cations from the dissolving MgZn2 phase were reduced effectively, facilitating the co-precipitation of Mg(OH)2, Zn5(CO3)2(OH)6, and Zn5(OH)8Cl2
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