用双层辉光等离子法在钛表面制备的Ti-Pd合金层性能研究

Performances of Ti-Pd Coating on Titanium Surface Prepared by Double Glow Plasma Technology

采用双层辉光等离子冶金技术在纯钛表面制备了Ti-Pd合金层。其深度大约为90μm,Pd含量呈梯度变化,并出现了TiPd3,TiPd2,Ti2Pd3,Ti3Pd5,TiPd,Ti4Pd等6种化合物相和Pd相。合金层在100℃的NaCl饱和溶液+HCl溶液以及40℃的8.6%H2SO4溶液中的耐缝隙腐蚀性能优于Ti0.2Pd合金;在室温80%H2SO4的溶液中,腐蚀速率仅为0.682mm/a,是Ti0.2Pd合金的18.2%;在室温30%HCl的溶液中,表面Ti-Pd的腐蚀速率仅为0.004mm/a,是Ti0.2Pd合金的12.5%。

Ti-Pd alloy coating was prepared on pure Titanium surface by double glow plasma alloy technology. TiPd3, TiPd2, Ti2Pd3, Ti3Pds, Ti Pd, Ti4Pd compound phases and Pd phase were observed on the alloyed surface layer with about 90 p.m thickness in which the content of Pd gradually changes along the depth direction. Compared with Ti0.2Pd, the alloy coating has better crevice corrosion resistance in NaCI saturated solution at 100℃ or in 8.6%H2SO4 solution at 40℃. Its corrosion rate is only 0.682 mm/a in 80%H2SO4 solution and 0.004 mm/a in 30%HCI solution at room temperature, which is only 18.2% and 12.5% of Ti0.2Pd corrosion rate at the same condition, respectively.