Influence of Micro-Nano α-Al₂O₃ Modified Acrylic Resin-Organosilane Composite Passivation Solution on Hardness and Corrosion Resistance of Stainless Steel

Abstract

The chromium-free passivation liquid composed of micro-nano α-Al2O3 modified acrylic resin-organosilane was applied to the surface of the stainless steel substrate, for exploring the impact of the micro-nano α-Al2O3 passivation film formed on the surface of the stainless steel on the surface properties of the stainless steel. The surface characteristics of the substrate through surface hardness testing and scanning electron microscopy testing were analyzed. Meanwhile, the bonding strength of the coating and the corrosion resistance of the substrate were explored through coating adhesion test and electrochemical test. Results showed that the chromium-free passivation liquid modified by micro-nano α-Al2O3 significantly improved the corrosion resistance of stainless steel plates, and the surface hardness was increased by 80%.

Keywords

• micro-nano α-al₂o₃; chromium-free passivation; modified acrylic resin-organosilane; stainless steel substrate; hardness; corrosion resistance