导电炭黑对5A06铝合金微弧氧化膜层耐磨性的影响

Influence of Conductive Carbon Black on Tribological Properties of Micro-arc Oxidation Ceramic Coating on 5A06 Aluminum Alloy

为进一步提高铝合金表面微弧氧化陶瓷层的摩擦磨损性能,在硅酸盐体系的电解液中加入一定量的导电炭黑,对5A06铝合金试样进行不同时间的微弧氧化处理。利用X射线衍射仪、扫描电子显微镜、显微硬度仪等分析5A06铝合金微弧氧化陶瓷层的物相组成、显微组织及显微硬度,并用摩擦磨损试验机对不同微弧氧化时间的陶瓷层进行磨损性能研究。结果表明,在微弧氧化电解液中加入少量导电炭黑后,制备的陶瓷层中含有一定量的碳元素,且随微弧氧化时间增加,陶瓷层中的含碳量先增后减,在干摩擦磨损条件下,其摩擦因数逐渐减小,陶瓷层的减摩、耐磨性得到有效提高。

The micro-arc oxidation coatings were prepared on 5A06 aluminum alloy by micro-arc oxidation （MAO） in NaESiO3-NaF-KOH-NaECO3 electrolyte with a certain amount of conductive carbon black with different MAO time to improve the friction and wear properties of the ceramic coatings. The phase composition, microstructure and microhardness were analyzed by XRD, SEM and microhardness tester. The friction and wear properties of micro-arc oxidation coatings treated with different MAO time were investigated using a friction and wear tester. The results show that a certain amount of carbon is contained in ceramic coating prepared by micro arc oxidation with adding a small amount of conductive carbon black in micro arc oxidation electrolytic. With the time increasing, the carbon content in the ceramic layer increase, the friction coefficient decreases and the and wear resistance improve effectively under the dry fiiction and wear conditions.