Abstract: The NiTi-based intermetallic compounds composite coating was produced on Ti-6Al-4V surface by laser in-situ synthesis. To investigate the microstructure of coating, the composition of oxide formed on the surface of the coating and the effect of the corrosion resistance of the coating after soaking. The results showed that the main components of the composite coating were NiTi, NiTi2 and a small amount of M3C2. Al2O3 and TiO oxides were formed on the surface of the coating after soaking for 3 d. TiO2 was formed on the surface of the coating after soaking for 5 d. The polarization curves and EIS were measured in 3.5wt% NaCl solution. It was found that the corrosion resistance of the coating and the TC4 alloy was increased with the increase of immersion time, and the composite coating soaked for 5 d had the best corrosion resistance.
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2020, Vol. 34 
