Corrosion resistance of Ti-Cu alloy
10.3760/cma.j.issn.1002-0098.2010.09.014
- VernacularTitle:新型钛铜合金的耐蚀性初探
- Author:
Yu-Xuan SONG
1
;
Shi-Ming WANG
Author Information
1. 北京大学口腔医学院口腔医院
- Keywords:
Titanium;
Alloys;
Electrochemistry;
Corrosion resistance
- From:
Chinese Journal of Stomatology
2010;45(9):565-568
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the corrosion behavior of Ti-Cu alloy in 0. 9% NaCl solution and in acidified 0. 9% NaCl solution. Methods The microstructure of Ti-Cu alloys were characterized by means of X-ray diffraction (XRD). The electrochemical behavior of Ti-Cu alloy in two solutions (namely 0.9% NaCl solution and acidified 0. 9% NaCl solution) was tested. Commercial pure Ti and 316L stainless steel were used as control. Results Ti-Cu alloys were composed by a-Ti and Ti2Cu intermetallic compound. After 3500 s immersion, the open circuit potential(OCP) values of pure Ti, Ti-5Cu alloy and Ti-10Cu alloy in 0.9% NaCl solution were -188, -181 and -173 mV, respectively. In 0. 9% NaCl solution with lactic acid added, the OCP values were - 143, - 158 and - 109 mV, respectively. In potentiodynamic polarization tests, the passive current densities of pure Ti and Ti-5Cu alloys were about 20 μA/cm2. However, 316L stainless steel experienced pitting corrosion . Conclusions It was possible to establish the following relation for their corrosion resistances: pure Ti ≈ Ti-5Cu >Ti-10Cu >316L stainless steel. The addition of lactic acid in the solution did not compromise the corrosion resistance of Ti-Cu alloys.
