Abstract
Al–Mg–Si alloy films were formed with various intermetallic compounds of Mg, Al, and Si element by coating Mg films on a hot-dip aluminized steel plate and applying heat treatment. Various corrosion resistance evaluations were also conducted. The heat-treated Mg films showed excellent corrosion resistance compared to the non heat-treated Mg films and the hot-dip aluminized steel plate. This resulted from a delayed dissolution of the metal atoms by the potential difference between the intermetallic compounds and single metals. The heat-treated Mg film had excellent corrosion resistance with a lower corrosion current density and higher corrosion potentials compared to the non heat-treated Mg film. In particular, the corrosion delay effect was clearly confirmed in the heat-treated Mg films in the galvanic corrosion test. Based on the above results, the corrosion mechanism of the heat-treated Mg films was verified.
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