Abstract
A protective coating is essential for hot stamping steel, which tends to suffer severe oxidation during the manufacturing process to form automotive parts. In this study, chromium (Cr) coating was electroplated on 22MnB5 hot stamping steel in a trivalent Cr bath, and its oxidation resistance during austenitizing was studied. High-speed electroplating was employed, which is in line with the continuous electrogalvanizing process of the steel mill. Experimental results show that the as-electroplated coating was amorphous and composed of Cr, C, and O species. Cracks were present on the Cr coating and their effect on the oxidation resistance was ameliorated when the thickness of the coating was less than 1 μm. Specifically, a compact Cr 2 O 3 layer formed not only on the surface of Cr coating but also in the cracks, which effectively protected the underlying 22MnB5 steel from oxidation during austenitizing at 900℃.
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