电流密度对Ti 6Al 4V微弧氧化膜形貌和性能的影响

采用NaAlO2-Na3PO4-NaF溶液体系,研究了电流密度对Ti 6Al 4V合金微弧氧化膜厚度、生长速率、表面形貌、粗糙度、组成相以及氧化膜耐蚀性、耐磨性等影响.结果表明,(1)在试验的电流密度范围内,氧化膜的厚度随电流密度的增大呈线性增大,但氧化膜的粗糙度却几乎呈指数增大,表面质量变差;(2)在质量分数为3.5%的NaCl溶液中显示了比Ti 6Al 4V钛合金更好的耐蚀性;(3)在干摩擦条件下,氧化膜的摩擦系数高于基体的,氧化膜的磨损机制为脆性断裂.

Effects of Current Density on the Growth, Morphology and Performance of Microarc Oxidation Films on Ti 6Al 4V Titanium Alloy

The effects of current density on the films thickness,growth rate,surface morphology,roughness,phases,corrosion resistance and wear resistance of the microarc oxidation films on Ti 6Al 4V titanium alloy are investigated by using NaAlO_2-Na_3PO_4-NaF aqueous solution at different current density. The results show that:(1) The films thickness increases in proportion to the current density,while the roughness increases exponentially,and the surface quality becomes worse within the trial current density range;(2) The film shows better corrosion resistance than Ti 6Al 4V substrate in mass fraction of 3.5% NaCl aqueous solution;(3) The friction coefficient of the film is higher than that of Ti 6Al 4V substrate without lubrication,and the wear mechanism of the film is primarily brittle crack.