Preparation and properties of Mg-Nd binary alloy MAO/SiO2@α-Fe2O3 organic composite coating

Abstract

An organic coating of about 40 mm was sprayed on the MAO coating containing Yb₂O₃. The main components of the organic coating are a mixture of SiO₂ and α-Fe₂O₃ with mass ratios of 20%, 22.5% and 25%, and three different MAO/SiO₂ @ α-Fe₂O₃ organic composite coatings are prepared. The morphology, roughness, microstructure and chemical composition of the organic composite coating are characterized. The results show that after coating the organic composite coating, the roughness of the coating is significantly reduced, and the compactness and interlayer adhesion of the coating are significantly improved. The electrochemical test and SKPFM test of the organic composite coating were carried out. The results showed that with the increase of the mass ratio of SiO₂ and α-Fe₂O₃, the corrosion resistance and stability of the organic composite coating increased, and the Volta potential also gradually moved up. The microwave absorbing properties of organic composite coatings were studied by vector network analyzer. The results show that the microwave absorbing properties of the coatings are positively correlated with the mass ratio of SiO₂ and α-Fe₂O₃.