Microstructure and properties of micro-arc oxidation ceramic films on AerMet100 steel

Abstract

In order to improve the service life of AerMet100 steel in complex environment, the structure and properties of AerMet100 steel coating film fabricated by micro-arc oxidation were investigated, and the differences between hot-dip micro-arc oxidation (HMAO) and in situ micro-arc oxidation (IMAO) coating films prepared by two different preparation methods were also clarified. The findings reveal that the IMAO film was mainly composed of Al2O3 and FeAl2O4 phases. The bonding strength between the film and the substrate was higher, and the structure of the film was compact. The ceramic film can effectively reduce the impact stress overload and improve the impact resistance of the substrate. The wear rate of IMAO film was 43% lower than that of HMAO film and the ceramic film had the characteristics of capacitance, which can significantly improve the corrosion performance of the substrate, but the defects of the film on the surface had a great effect on the corrosion resistance.

Keywords

• Microstructure
• Properties
• AerMet100 steel
• Micro-arc oxidation