Abstract
As a medical implant material, NiTi must have good corrosion resistance in order to adapt to the complex environment in the human body. However, the impact of heat treatment on the corrosion resistance of NiTi alloys prepared by selective laser melting (SLM) remains unclear. This work investigates the effect of heat treatment on the microstructure and corrosion behavior of SLM-NiTi alloys through in-situ corrosion methods. The results indicate that the overall corrosion resistance of SLM-alloy is enhanced after heat treatment. This enhancement is attributed to the gradual transformation of HAGBs to LAGBs, reduction in dislocation density. Combined with electrochemical tests, the passivation film Rf increased, the passivation film on the alloy surface was denser, so the grain boundaries were more stable. Furthermore, the B19’ phase content increased significantly and was concentrated in the grains with GOS < 1. Pitting sources can form within these grains, leading to pitting corrosion. This work provides a theoretical basis for the preparation of high corrosion resistance SLM-NiTi alloys.
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