Ti2Ni3Si/NiTi金属间化合物合金在H2SO4溶液中的腐蚀行为

Corrosion Behavior of Ti2Ni3Si/NiTi Intermetallic Alloys in H2SO4 Solution

摘要:

利用激光熔炼材料制备技术，制得了由三元金属硅化物Ti2Ni3Si初生枝晶和枝晶间Ti2Ni3Si/NiTi共晶组成的金属间化合物耐磨耐蚀合金；采用极化曲线、塔菲尔图(Tafel Plot)和交流阻抗(EIS)等技术，研究了合金在1 mol/L H2SO4溶液中的电化学腐蚀行为以及Ti含量对合金组织与耐蚀性的影响。结果表明：由于表面形成的稳定钝化膜及Ti2Ni3Si和NiTi的高化学稳定性，使合金在1 mol/L H2SO4溶液中具有优异的耐蚀性，且随着Ti含量的升高，合金的耐蚀性略有提高。

Abstract:

Novel corrosive wear resistant alloys with the microstructure consisting of ternary metal silicide Ti2Ni3Si primary dendrites and Ti2Ni3Si/NiTi eutectic matrix were designed and fabricated by the laser melting process. Both the corrosion behavior of Ti2Ni3Si/NiTi intermetallic alloys and the effect of Ti content in alloys on the corrosion resistance of alloys were investigated by polarization curve, Tafel plot, EIS in 1 mol/L H2SO4 solution. Results show that the alloys have excellent corrosion resistance in 1 mol/L H2SO4 solution owing to the formation of stable passivation film and the high chemical stability of Ti2Ni3Si and NiTi intermetallic. With increasing of Ti content, the corrosion resistances of the alloys are improved slightly.