2024 Volume 64 Issue 10 Pages 1548-1556
Vanadium composite electrogalvanized (Zn–V hydroxide) steel sheets were prepared by electroplating using a horizontal flow cell. The structure of the Zn–V plating layer depended on the flow rate of electrolyte and the current density, and the performance of Zn–V steel sheets depended on the structure of plating films. The Zn–V plating films composed of two-phase structure without cracks showed the high corrosion resistance and high adhesion. The two-phase layer consisted of the field-oriented fiber and non-field oriented texture. The field oriented fiber phase was mainly formed from the amorphous V compound. The V compound in the non-field oriented phase seems to be formed by hydrogen evolution during Zn–V composite plating. The Zn–V steel sheets had a black and low-gloss appearance compared to the conventional electrogalvanized steel sheet (EG). Since the V compound in the non-field oriented texture was black and the field oriented texture formed the surface roughness, the lightness and gloss of the Zn–V steel sheets decreased with increasing V content in plating films.
