钛表面辉光无氢渗碳动力学与耐蚀性能研究

Study on Kinetics and Corrosion Resistance of Plasma Non-hydrogen Carburizing on Titanium Surface

采用辉光无氢渗碳方法,在工业纯钛TA2表面制备渗碳层,研究辉光无氢渗碳动力学以及渗碳试样在25℃、3.5% NaCl水溶液和25℃、80% H2SO4水溶液中的耐蚀性能。结果表明,渗碳层厚度随渗碳温度与时间的增加而增加,碳在渗碳层中的扩散系数与绝对温度之间符合Arrhenius关系式,扩散活化能为13.6kJ/mol(0.14eV)。渗碳试样在25℃ 3.5% NaCl、80% H2SO4水溶液中的腐蚀速率分别为0.00048mm/a、2.118mm/a,分别是Ti-0.2Pd的77%、50%,分别是TA2的13%、11%,耐蚀性能得到显著提高。

C.P.Ti TA2 was carburized by double-glow plasma non-hydrogen carburizing technique. The carburizing kinetics was studied. The corrosion resistance of the carburized samples was evaluated in 3.5% NaCl and 80% H2SO4 water solution at 25 ℃. The results show that the thickness of carburized layer increases with increasing carburizing temperature and time. The relationship between the diffusion coefficient of carbon in carburized layer and the carburizing temperature accords with the Arrhenius manner. The value of diffusion activation energy is 13.6 kJ/mol （0.14 eV）. The carburized sample has better corrosion resistance than Ti-0.2Pd and C.P.Ti. The corrosion rate of carburized layer is 0.00048 and 2.118 mm/a in 3.5% NaCl and 80% H2SO4 water solution, which is 77% and 50% of that of Ti-0.2Pd and 13% and 11% of that of C.P.Ti under the same condition, respectively.