Effect of Mg2+ on the microstructure and corrosion resistance of the phosphate conversion coating on hot-dip galvanized sheet steel |
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| Authors: | Cheng-Yang Tsai Jen-Shou Liu Pei-Li Chen Chao-Sung Lin |
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| Affiliation: | 1. Department of Materials Science and Engineering, National Taiwan University, 1 Roosevelt Road, Section 4, Taipei 106, Taiwan;2. New Materials R&D Department, China Steel Corporation, 1 Chung Kang Road, Hsiao Kang, Kaohsiung 802, Taiwan |
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| Abstract: | The effect of Mg2+ in the phosphate solution on the microstructural evolution and corrosion resistance of the coating on hot-dip galvanized steel has been explored. Surface morphology observations reveal that increasing the solution Mg2+ concentration increases the population density and refines the grain size of the phosphate grains. In the presence of Mg2+, the phosphate coating is composed of mixed Zn phosphate hydrate and (Zn, Mg) phosphate hydrate. Furthermore, elevating Mg2+ in the solution reduces the porosity of the phosphate coating. As a result, the corrosion resistance of the phosphate coating is improved. |
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