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

Abstract:

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.

Key words:plasma immersion ion implantation (PIII); Ti-6Al-4V alloy; Ag; frictional wear resistance; corrosion resistance