Ti6Al4V合金渗镀Mo-N表面改性层在不同腐蚀环境下的抗磨损行为研究

Corrosion-Wear Behavior of Molybdenum Nitride Layer on Ti6Al4V Alloy

采用等离子渗镀技术在钛合金(Ti6Al4V)表面形成均匀致密的钼氮合金渗镀层。在3.5%NaCl溶液、0.5mol/L的H2SO4溶液、0.02mol/L的Na3PO4溶液和亨氏溶液中,对比研究了Ti6Al4V合金及其钼氮改性层的抗腐蚀磨损性能。20000周次腐蚀环境下的微动磨损试验结果表明,渗镀的Mo-N改性层显著提高了Ti6Al4V合金的抗腐蚀磨损能力。电化学噪音测量结果证明,Mo-N改性层削弱了Ti6Al4V合金腐蚀和磨损相互耦合增幅的作用。

A molybdenum nitride layer on the surface of Ti-6A1-4V alloy was fabricated by a plasma planting process. The corrosion-wear behaviors and mechanisms for Ti-6A1-4V alloy with and without nitride layer were comparatively investigated in 3.5 wt.% NaC1, 0.5 mol/L H2SO4, 0.02 mol/L Na3PO4 and Hanks＇ solutions. Mo-N modification layer shows smaller friction coefficients and higher wear resistance than that of Ti6A14V substrate. The excellent corrosion-wear performances of Mo-N modification layer come from their strong corrosion resistance and wear resistance. Electrochemistry tests show that the current noise levels for the Mo-N modified titanium alloy are much smaller than that measured on untreated titanium alloy in the same solution.