目的 研究恒流模式下阴极电流密度对6061铝合金在含Na2WO4的电解液中制备的微弧氧化膜厚度、形貌、相组成及耐磨性能的影响。方法 固定阳极电流密度为5.0 A/dm²，阴极电流密度分别为0、1.25、2.5、3.75、5.0 A/dm²，对6061铝合金进行微弧氧化40 min。用涡流测厚仪测量了氧化膜的厚度，用扫描电镜观察了微弧氧化膜的表面形貌和截面形貌，用能谱分析仪分析了氧化膜的表面成分，用X射线衍射分析仪分析了微弧氧化膜的相组成，用往复式摩擦磨损试验机测试了氧化膜的耐磨性能。结果 随着阴极电流密度的增加，氧化膜内的W含量逐渐减少，氧化膜颜色逐渐变浅，氧化膜厚度逐渐增加。微弧氧化膜的主要组成相为α-Al2O3和γ-Al2O3。当阴极电流密度从0 A/dm²增加到3.75 A/dm²时，氧化膜内孔洞的数量和尺寸逐渐减少，孔洞到氧化膜/基体界面的距离逐渐增加，氧化膜的耐磨性能逐渐提升。当阴极电流密度为3.75 A/dm²时，氧化膜的磨损率最低，仅为1.07×10^?4 mm³/(N.m)。但阴极电流密度增加到5.0 A/dm²时，氧化膜表层出现孔洞和剥落，耐磨性能下降。结论 阴极电流的加入有助于增加6061铝合金微弧氧化膜的厚度，提高氧化膜的致密性和耐磨性能，但过高的阴极电流会导致氧化膜表层出现孔洞，降低耐磨性能。

Plasma electrolytic oxidation (PEO) is one of the promising methods for creating wear resistance coatings on aluminum alloy. The qualities of PEO coatings are determined by many factors, such as substrate materials, power supply modes, electrolyte composition, oxidation time and additives. In the bipolar power supply mode, the cathodic current density plays an important role in the PEO process. Previous results showed that the increase of cathodic current density could reduce the strong plasma discharges which made the coatings more compact and have better wear resistance. The composition of electrolyte is another key factor affecting the structure and performance of PEO coating. The use of Na2WO4 containing electrolytes has emerged in recent years due to the wear and corrosion resistant properties of the resulted coatings. However, there is no research on the effect of cathodic current density on the structure and wear resistance of PEO film prepared in Na2WO4 containing electrolyte. In this work, PEO films were prepared on 6061 aluminum alloy under different cathodic current densities in electrolyte composed of Na2SiO3, Na2WO4 and KOH. The effect of cathodic current density on the thickness, composition, structure and wear resistance of the PEO films was studied.