1. Influence of annealing temperatures on corrosion resistance of magnesium thin film-coated electro-galvanized steel.
- Author
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Myeong-Hoon Lee, Yeon-Won Kim, Seul-Gee Lee, Jae-Wook Kang, Jun-Mu Park, Kyung-Man Moon, and Yun-Hae Kim
- Subjects
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MAGNESIUM films , *ANNEALING of metals , *EFFECT of temperature on metals , *CORROSION & anti-corrosives , *METALLIC thin films , *METAL coating , *ZINC plating , *STEEL - Abstract
To improve the corrosion resistance of an electro-galvanized steel sheet, we deposited magnesium film on it using a vacuum evaporation method and annealed the films at 250-330°C. The zinc-magnesium alloy is consequently formed by diffusion of magnesium into the zinc coating. From the anodic polarization test in 3% solution, the films annealed at 270-290°C showed better corrosion resistance than others. In X-ray diffraction analysis, ZnMg2 was detected throughout the temperature range, whereas Mg2Zn11 and FeZn13 were detected only in the film annealed at 310°C. The depth composition profile showed that the compositions of at 270-290°C are evenly and deeply distributed in the film surface layer. These results demonstrate that 270-290°C is a proper temperature range to produce a layer of MgZn2 intermetallic compound to act as a homogenous passive layer. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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