Sherif El-Sayed M, Bahri Yassir A, Alharbi Hamad F, Ijaz Muhammad Farzik
Center of Excellence for Research in Engineering Materials (CEREM), Deanship of Scientific Research, King Saud University, Riyadh 11421, Saudi Arabia.
Mechanical Engineering Department, Collage of Engineering, King Saud University, Al-Riyadh 11421, Saudi Arabia.
Materials (Basel). 2023 Jun 26;16(13):4603. doi: 10.3390/ma16134603.
The powder metallurgy method was used to manufacture three Ti-based alloys: Ti-15%Zr-2%Ta-4%Sn (Ti-Zr-Ta-4Sn), Ti-15%Zr-2%Ta-6%Sn (Ti-Zr-Ta-6Sn), and Ti-15%Zr-2%Ta-8%Sn (Ti-Zr-Ta-8Sn). Electrochemical measurements and surface analyses were used to determine the effect of Sn concentration on the corrosion of these alloys after exposure to a simulated body fluid (SBF) solution for 1 h and 72 h. It was found that the passivation of the alloy surface significantly increased when the Sn content increased from 4% to 6% and then to 8%, which led to a significant reduction in corrosion. The impedance spectra derived from the Nyquist graphs also explained how the addition of Sn significantly improved the alloys' polarization resistances. According to the change in the chronoamperometric current at an applied anodic potential over time, the increase in Sn content within the alloy significantly reduced the currents over time, indicating that the uniform and pitting corrosion were greatly decreased. The formation of an oxide layer (TiO), which was demonstrated by the surface morphology of the alloys after exposure to SBF solution for 72 h and corrosion at 400 mV (Ag/AgCl) for 60 min, was supported by the profile analysis obtained by an X-ray spectroscopy analyzer. It was clear from all of the findings that the tested alloys have a remarkable improvement in resistance to corrosivity when the Sn content was increased to 8%.
Ti-15%Zr-2%Ta-4%Sn（Ti-Zr-Ta-4Sn）、Ti-15%Zr-2%Ta-6%Sn（Ti-Zr-Ta-6Sn）和Ti-15%Zr-2%Ta-8%Sn（Ti-Zr-Ta-8Sn）。通过电化学测量和表面分析，确定了在模拟体液（SBF）溶液中暴露1小时和72小时后，锡浓度对这些合金腐蚀的影响。结果发现，当锡含量从4%增加到6%，再增加到8%时，合金表面的钝化作用显著增强，从而导致腐蚀显著降低。从奈奎斯特图得到的阻抗谱也解释了锡的添加如何显著提高合金的极化电阻。根据施加阳极电位下计时电流随时间的变化，合金中锡含量的增加显著降低了电流随时间的变化，表明均匀腐蚀和点蚀大大减少。X射线光谱分析仪的轮廓分析证实，在SBF溶液中暴露72小时并在400 mV（Ag/AgCl）下腐蚀60分钟后，合金的表面形态证明了氧化层（TiO）的形成。从所有研究结果可以清楚地看出，当锡含量增加到8%时，测试合金的耐腐蚀性有显著提高。
