Abstract In this research, a ceramic combination of Hydroxyapatite and ZnO with a weight ratio of ‎‎50:50 was deposited on NiTi shape memory alloy by Electrophoretic Deposition Process ‎‎(EPD). Deposition of the Hydroxyapatite-ZnO on NiTi alloy was performed by applying 50 ‎volts for 100 s. The sintering operation was then conducted for 2 h in a furnace ‎under an argon atmosphere at 500 °C. In the next step, the morphology and thickness of the ‎coating were studied by Field Emission Scanning Electron Microscopy (FE-SEM). In addition, ‎bioactivity behavior and corrosion resistance of the coating were evaluated using ‎electrochemical tests, and the rate of the Ni ion release has been investigated in ‎Simulated Body Fluids (SBF) solution. The FE-SEM observations on the morphology of the ‎Hydroxyapatite-ZnO ceramic nanostructured coating revealed that a non-crack coating with ‎approximate 135 µm thickness was deposited on the NiTi alloy. The results also ‎showed that the Hydroxyapatite-ZnO nanostructured coating leads to the formation of ‎ion exchange barrier on the NiTi alloy surface which acts well as a barrier to penetrating ‎nickel ions in the body fluid, in such a way that the corrosion resistances of NiTi alloy has been ‎increased significantly in the presence of Hydroxyapatite-ZnO coating. Also, the adhesion ‎strength of the Hydroxyapatite-ZnO ceramic nanostructured coating on NiTi shape memory ‎alloy was highly desirable (about 25.4 ± 0.1 MPa).‎

中文翻译：

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沉积在 NiTi 形状记忆合金上的羟基磷灰石-ZnO 纳米结构涂层的生物活性行为和腐蚀响应表征

摘要 在这项研究中，羟基磷灰石和氧化锌的陶瓷组合，重量比为 50:50，通过电泳沉积工艺（EPD）沉积在 NiTi 形状记忆合金上。通过施加 50 伏电压 100 秒，在 NiTi 合金上沉积羟基磷灰石-ZnO。然后在 500°C 的氩气气氛下在熔炉中进行 2 小时的烧结操作。在下一步中，通过场发射扫描电子显微镜 (FE-SEM) 研究涂层的形态和厚度。此外，使用电化学测试评估了涂层的生物活性行为和耐腐蚀性，并在模拟体液 (SBF) 溶液中研究了 Ni 离子释放的速率。FE-SEM 对羟基磷灰石-ZnO 陶瓷纳米结构涂层形态的观察表明，在 NiTi 合金上沉积了约 135 µm 厚的无裂纹涂层。结果还表明，羟基磷灰石-ZnO 纳米结构涂层导致在 NiTi 合金表面形成离子交换屏障，作为渗透体液中镍离子的屏障，从而使耐腐蚀性能在羟基磷灰石-ZnO 涂层的存在下，NiTi 合金的显着增加。此外，NiTi 形状记忆合金上羟基磷灰石-ZnO 陶瓷纳米结构涂层的粘附强度非常理想（约 25.4 ± 0.1 MPa）。结果还表明，羟基磷灰石-ZnO 纳米结构涂层导致在 NiTi 合金表面形成离子交换屏障，作为渗透体液中镍离子的屏障，从而使耐腐蚀性能在羟基磷灰石-ZnO 涂层的存在下，NiTi 合金的显着增加。此外，NiTi 形状记忆合金上羟基磷灰石-ZnO 陶瓷纳米结构涂层的粘附强度非常理想（约 25.4 ± 0.1 MPa）。结果还表明，羟基磷灰石-ZnO 纳米结构涂层导致在 NiTi 合金表面形成离子交换屏障，作为渗透体液中镍离子的屏障，从而使耐腐蚀性能在羟基磷灰石-ZnO 涂层的存在下，NiTi 合金的显着增加。此外，NiTi 形状记忆合金上羟基磷灰石-ZnO 陶瓷纳米结构涂层的粘附强度非常理想（约 25.4 ± 0.1 MPa）。