Low-temperature alkali corrosion induced growth of nanosheet layers on NiTi alloy and their corrosion behavior and biological responses

We report on a reliable and cost-effective method (alkali corrosion) to construct nanosheet layers on nearly equiatomic nickel-titanium (NiTi) alloy, which only needs to immerse it in 1- 15 M NaOH solution at low temperature (4-80 square). The layers are mainly composed of TiO2, Na4TiO4, and Ni(OH)(2), and Ni content increases with NaOH concentration. The layers exhibit potent antibacterial ability and can promote endothelial spreading and proliferation, although the corrosion resistance is slightly decreased due to significantly increased specific surface area. Good corrosion resistance, antibacterial ability, and cytocompatibility render the nanosheet layers promising as biomedical coatings of the NiTi alloy.

Automated summary

A reliable and cost-effective method, alkali corrosion, is used to construct nanosheet layers on a nearly equiatomic nickel-titanium (NiTi) alloy. The layers are mainly composed of TiO2, Na4TiO4, and Ni(OH)(2), with Ni content increasing with NaOH concentration. Despite slightly decreased corrosion resistance due to increased specific surface area, the nanosheet layers exhibit potent antibacterial ability and can promote endothelial spreading and proliferation. The combination of good corrosion resistance, antibacterial ability, and cytocompatibility makes the nanosheet layers promising as biomedical coatings for the NiTi alloy.