水管用Q235碳钢微弧氧化膜氧化动态性能表征

研究了不同氧化时间下水管用Q235碳钢MAO膜的孔隙率与孔径分布状态并利测试了膜的摩擦性能。研究结果表明:在Q235碳钢MAO膜的表面形成了具有明显“火山口”外形的微观形态。当氧化时间增加后,在MAO膜表面形成的孔隙数量也不断降低,膜表面孔隙率不断减小。当氧化时间增加后,粗糙度也不断增大,膜厚度也不断增大,但增长速率不断降低。所有MAO膜试样都达到了比碳钢基体更大的摩擦系数,摩擦系数表现为随氧化时间增加而升高。在碳钢表面生长一层MAO膜可以显著减小磨损率。当氧化时间增加后,MAO膜磨损率先增大后降低。当氧化时间增加后,磨痕深度先增大后减小。

Tribological Characteristics of Q235 Steel Modified with Micro Arc Oxidized Coating:An Experimental Study

The surfaces of Q235 steel,a water pipe material,were modified by micro arc oxidation(MAO).The influence of the oxidation time on the microstructures and tribological behavior of MAO coatings was investigated with X-ray diffraction(XRD),scanning electron microscopy(SEM) and conventional mechanical probes.The results show that the oxidation time had a major impact.To be specific,as the oxidation time increased,the thickness,compactness,surface roughness and friction coefficient of the MAO coatings increased,the growth-rate and surface porosity decreased,accompanied by an increase of the corrosion-resistance,however,the wear-rate and wear-track depth changed in a decrease-increase-decrease mode.The friction coefficient of MAO coating was large than that of Q235 steel,and the crater-shaped pores,with a fairly big size distribution,dominated the MAO coatings.Possible mechanisms were also tentatively discussed.