Research On Corrosion And Wear Behavior Of Medical TLM Titanium Alloys In Simulated Boby Fluids Containing Protein

Titanium and its alloys are one of the most widely used biomedical materials for many surgical applications due to their excellent corrosion resistance, mechanical stability and biocompatibility. Moreover, α+β-type titanium alloys, particularly the P-type titanium alloys have received considerable attention as a preferable candidate of Ti-based biomaterial owing to their lower elasticity modulus and better biocompatibility compared with the traditional titanium and its alloys. Hereinto, TLM titanium alloy has of late years developed rapidly as promising joint prosthesis. However, the operating environment of artificial joints is quite complicated so that it is still difficult to understand the corrosion and wear behaviour of titanium alloy joint under physiological environment profoundly. For this reason, the study on the bio-corrosion and wear behaviour of TLM titanium alloy in the simulated body fluids containing proteins and hyaluronic acid has been carried out, and the primary experimental results are exhibited as follows:From the corrosion tests, TLM titanium alloy has shown a enhanced corrosion resistance in the presence of albumin, y-IgG and hyaluronic acid. Especially in the solution with 2.5g/L hyaluronic acid, TLM titanium alloy exhibits the best corrosion resistance. Additionally, the surface morphologies of TLM titanium alloy in any testing fluids are characterized by local corrosion.Based on the wear tests, the presence of albumin, y-IgG and hyaluronic acid can reduce the friction coefficient and wear rate, which reflects the better wear resistance of TLM titanium alloy under organic environment.Under coexist condition of both corrosion and wear, TLM alloy suffers severe corrosion. However, the addition of albumin, y-IgG and hyaluronic acid in PBS together can effectively alleviate the corrosion of TLM alloy.Compared with TZNT titanium alloy, similarly is that the corrosion resistance as well as wear resistance of the two type of titanium alloys has strengthened in the presence of proteins and hyaluronic acid. Hereinto, the inhibitory effect of hyaluronic acid on the corrosion of titanium alloys is significant. Generally, on the one hand, TZNT titanium alloy has a better corrosion resistance than TLM titanium alloy. On the other hand, the friction coefficient of TLM titanium alloy is higher than TZNT titanium alloy while its wear rate is lower than the latter.