Analysis of Microstructure and Properties of Micro-Arc Oxidation Coatings on 2A12 Aluminum Alloys for Marine Applications

摘要

There has been widespread use of 2A12 aluminum alloys in marine industry applications with exposure to harsh and complex environments. Ceramic oxide coatings were carried out on the surface of 2A12 aluminum alloys by a micro-arc oxidation (MAO) process. The microstructure, phase composition, wear resistance, and corrosion behavior of the MAO coatings were investigated experimentally. This paper mainly focuses on the experimental work to determine the effect of MoS2 concentration in the base electrolyte on the properties of MAO coatings. The results show that the MoS2 concentration greatly affects the preparation of MAO coating during the process. The coating becomes compact, smooth, and of the highest thickness on the surface when the concentration of nano-MoS2 particles is at 2.0 g/L. Furthermore, incorporation of nano-MoS2 particles significantly improves the wear resistance of MAO coatings when compared to the case without MoS2 particles. In addition, the best anticorrosion performance can be obtained among all coated samples by adding 2.0 g/L MoS2 nanoparticles in electrolyte.