Effect Of Cu And Ag On The Corrosion Resistance And Friction And Wear Properties Of TC4 Alloy

The alloy of titanium is widely applied in the field of aviation, aerospace and navigation today. In the sea water or other corrosive media, mechanical structure, service life and operational reliability of materials would be markedly affected by corrosion resistance and friction behavior. So the corrosion resistance and friction behavior were research for the alloy of TC4 with Cu and Ag which is in the morphology of as-cast.The TC4 alloy with different contents of Cu and Ag was obtained by the method of self-consumable vacuum arc melting (VAR) and three kinds of TC4-1%Cu, TC4-2%Cu, TC4-1%Ag would be have. The electrochemical behavior of the four kinds of titanium alloy in artificial seawater was researched by electrochemical, the surface morphology that treated by corrosion in artificial seawater was observed by scanning electron microscopy (SEM). The results show that the corrosion potential is raised and corrosion current is decreased when TC4 alloy was added Cu and Ag. TC4 surface is significantly much rough than the other three kinds of alloy after treatment by artificial seawater corrosion. And the loss of quality by corrosion of TC4 alloy is larger than the other three kinds of alloy, indicating that the corrosion resistance of TC4 has improvement when Cu and Ag have added in it.At the performances of corrosive wear, Gr15 ball as Friction material was used to study the changes of friction coefficient and wear loss in different loads and friction velocity for the three kinds of alloys which was in three different corrosive media. And the surface morphology of wear scars was observed by scanning electron microscopy. The result shows that Load is more important than frequency for the friction coefficient of the three alloys in the three frictional media. The friction coefficient is more in normal temperature air than in the two corrosive media, and in the two corrosive media, the wear loss of TC4 could be reduced by Cu and Ag, but the friction coefficient has increased. By the surface morphology of wear scars which was observed by SEM, we can found that the wear mechanism of TC4-Ag and TC4-Cu is mainly as cutting wear with fatigue wear when the wear load increased. When load is constant, the wear mechanism of TC4-Ag and TC4-Cu is fatigue wear. The wear mechanism of TC4 is cutting wear in solution of NaCl, and in Artificial Seawater. In normal temperature air of the media, the wear mechanism of TC4 is mainly as fatigue wear in different frequency. When the frequency is constant, the wear mechanism of TC4 is fatigue wear change to cutting wear by the wear load increased.