Corrosion resistance of MoS2-modified titanium alloy micro-arc oxidation coating

To improve the corrosion resistance of the Ti-6Al-4V alloy treated by micro-arc oxidation (MAO), molybdenum disulfide (MoS2) particles were added into the electrolyte and a composite oxide coating was formed with different MoS2 contents on the surface of Ti-6Al-4V alloy. A scanning electron microscope and a handheld roughness meter were used to analyze the surface morphology and roughness of the coating, and the corrosion performance of the MAO-treated Ti-6Al-4V alloy was analyzed by galvanic corrosion meter and electrochemical workstation. The results show that MoS2 can be successfully incorperated into the coating and block the micropores during the process of micro-arc oxidation. Electrochemical experiments showed that the coating has a higher resistance and a lower corrosion rate, while in the galvanic experiment, the galvanic potential and galvanic current of the coating also decreased. Under the experimental conditions, the addition of MoS2 can significantly improve the corrosion resistance of the MAO coating, and the best corrosion resistance is obtained when the addition amount is 4g/L, this will expand the marine applications of Ti-6Al-4V alloy.