Effect of Ce and Mg on the Corrosion Resistance of Hot-Dip Aluminizing Coating

The corrosion resistance of hot-dip aluminizing coating doped with cerium and magnesium was evaluated by conducting corrosion tests in various fluids. The microstructure , elemental composition and phase composition of the corroded aluminizing coating were analyzed using a scanning electron microscope, an energy dispersive spectrometer, and an X-ray diffractometer. Results showed that adding 0. 5 % cerium helped to improve the corrosion resistance of the aluminizing coatingin strong aqueous acids, saline water, and tap water. The additionof 0.5% cerium and 1.0% Magnesium further contributed to improve the corrosion resistance of the aluminizing coating in diifferent fluids. However, the addition of cerium and magnesium had no significant effect on the corrosion resistance of the alumi-nizing coating in strong alkaline solution.