TC4合金表面全方位离子注入Ag的耐摩擦磨损和抗腐蚀性能

为改善TC4合金表面的耐磨性能和抗腐蚀性能,用等离子体浸没离子注入(PIII)技术在合金表面注入不同剂量的金属银.采用XRD、XPS、AES等方法分析改性层的元素浓度分布和化学组成,研究Ag离子注入后试样表面的耐摩擦磨损性能、抗腐蚀性能、纳米硬度和弹性模量.结果表明,表面改性层中主要存在Ag相,同时含有少量的TiAg;处理后注入剂量为1×10~(17) ions/cm~2试样的纳米硬度和弹性模量分别提高62.5%和54.5%;磨损面积减小57.6%;摩擦系数由基体合金的0.78下降到0.2.在3.5%NaCl溶液中的腐蚀电位升高,腐蚀电流密度明显减小,耐蚀性得到了显著改善.

Frictional Wear Resistance and Corrosion Resistance of Ag/Ti-6Al-4V Alloy System Treated by Plasma Immersion Ion Implantation Technique (PIII)

In order to improve the frictional wear resistance and corrosion resistance of Ti-6Al-4V alloy surface, argentine(Ag) ions with different dose were implanted into the polished alloy sample surface by plasma immersion ion implantation (PIII) technique. The chemical composition and element concentration distribution of the modified layer were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectrum (XPS), and Auger electron spectrum (AES). Frictional wear resistance, corrosion resistance, microhardness and elastic modulus of sample alloy surface were studied after argentine ions implantation. Results show that the modified layer consists of Ag phase mainly and a few TiAg phase. The microhardness and elastic modulus increases by 62.5% and 54.5%, respectively, for the sample with 1× 1017 ions/cm2 argentine ions dose. The wear area decreases by 57.6%, and the friction coefficient reduces to 0.2 from 0.78 of the matrix alloy. In addition, the corrosion resistance of treated alloys in 3.5% NaCl solution is also improved significantly, with increasing corrosion potential and remarkably decreasing corrosion current density.