Influence of Fine Particle Peening on Corrosion Resistance of Coating Materials

Abstract

When a plated steel sheet is welded, it is repaired by coating or spraying as the plating layer is damaged. In order to ensure corrosion resistance after painting, pre-treatment before painting is important. Therefore, in this study, we investigated the influence of each pre-treatment for painting repair on corrosion resistance after painting. Our research also focused on the surface modification effect by fine particle peening treatment for each pre-treatment. Then, we considered the difference in corrosion resistance of each sample from a histological viewpoint by X-ray diffraction and an electrochemical viewpoint by cathode polarization. Our results indicated that Ni could be attached to the surface of the material to be treated by fine particle peening treatment, using Ni powder. They also indicated that the samples coated after the fine particle peening treatment, using the Ni powder, had a smaller red rust generation area and had superior corrosion resistance than the other samples. The results suggested that this factor is attributed to the formation of corrosion products with high inhibitory effect on oxygen reduction reaction on the surface of the material to be treated, because Ni had become attached to the surface of the same.