Ti-6Al-4V合金渗氮层的生物腐蚀行为

采用真空感应快速渗氮技术对Ti-6Al-4V合金进行表面渗氮,将渗氮前后的试样置于SBF溶液中探究其耐蚀性。利用维氏硬度计、光学显微镜、电化学工作站、光学3D表面轮廓仪、扫描电镜(SEM)和X射线衍射(XRD)等技术对渗氮层进行测量和观察。试验结果表明:820 ℃下对Ti-6Al-4V钛合金进行真空感应渗氮处理后,渗氮层厚度达20 μm,其氮化物层硬度得到明显提高。同时,经过感应渗氮处理后样品的表面粗糙度增加。电化学试验表明经感应渗氮后Ti-6Al-4V钛合金的耐蚀性明显增强。

Biological corrosion behavior of nitriding layer of Ti-6Al-4V alloy

Surface nitriding of the Ti-6Al-4V alloy was carried out by vacuum induction rapid nitriding technology, and the specimens before and after nitriding were placed in SBF solution to explore its corrosion resistance. The nitriding layer was characterized by means of Vickers hardness tester, metallographic microscope, electrochemical workstation, optical 3D surface profilometer, scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the thickness of nitriding layer in Ti-6Al-4V alloy reaches 20 μm after vacuum induction nitriding treatment at 820 ℃. And the hardness of nitriding layer is obviously improved. Meanwhile, the surface roughness of the sample increases after induction nitriding. Electrochemical tests show that the corrosion resistance of the Ti-6Al-4V titanium alloy is enhanced obviously after induction nitriding.