In recent years, selective laser melting (SLM)-NiTi alloy has attracted widespread interest due to its ability to prepare medical implant materials with complex shapes and high dimensional accuracy. However, SLM-NiTi biomedical materials still face the problems of Ni ion release, poor corrosion performance, and biological inertness. This study is the first to report that the preparation of graphene oxide (GO) coatings on the SLM-NiTi alloy via the electrodeposition method. By changing the deposition time, the effect on coating morphology, corrosion resistance, biomineralization, and biocompatibility was studied. The result showed that GO coating could effectively enhance the corrosion resistance of SLM-NiTi alloy and inhibit the Ni ions release. The GO coating obtained when the deposition time was 20 min possessed the best corrosion resistance, which corrosion current density was about two orders of magnitude lower than that of SLM-NiTi alloy. Moreover, GO coating can effectively promote the adhesion, growth, and proliferation of osteoblasts. Therefore, the GO coated SLM-NiTi alloy is promising for clinical application.

近年来，选择性激光熔化（SLM）-NiTi合金因其能够制备形状复杂、尺寸精度高的医用植入材料而引起广泛关注。然而，SLM-NiTi生物医用材料仍面临Ni离子释放、腐蚀性能差、生物惰性等问题。本研究首次报道了通过电沉积法在 SLM-NiTi 合金上制备氧化石墨烯 (GO) 涂层。通过改变沉积时间，研究了对涂层形貌、耐腐蚀性、生物矿化和生物相容性的影响。结果表明，GO涂层能有效提高SLM-NiTi合金的耐腐蚀性能，抑制Ni离子的释放。沉积时间为 20 min 时获得的 GO 涂层具有最好的耐腐蚀性，其腐蚀电流密度比 SLM-NiTi 合金低两个数量级左右。此外，GO涂层可以有效促进成骨细胞的粘附、生长和增殖。因此，GO包覆的SLM-NiTi合金具有临床应用前景。