海洋工程用铝合金表面微弧氧化膜的耐腐蚀性能

Corrosion Resistance Property of Micro-arc Oxidation Coating of Aluminum Alloys for Offshore Engineering

为了制备性能良好的微弧氧化膜层,以提高海洋平台用2Al2铝合金的腐蚀性能。试验采用微弧氧化技术,将不同浓度的MoS_2颗粒(0 g/L、1 g/L、2 g/L、4 g/L、6 g/L和8 g/L)添加到电解液中,在2Al2铝合金表面制备微弧氧化膜层。通过扫描电子显微镜和光学显微镜,对复合镀层的微观形貌和组织结构进行分析;采用摩擦磨损试验、电化学腐蚀试验等试验方法,分析镀层的摩擦系数和耐腐蚀性能。试验结果表明:随着纳米MoS_2颗粒含量的增加,陶瓷层表面微孔尺寸减小,数量增加,分布更加均匀,致密度得到很大提高,且膜层厚度随着纳米MoS_2颗粒含量的增加先增后减;添加纳米MoS_2颗粒后,膜层摩擦系数降低,基本稳定在0.45左右;当纳米MoS_2颗粒含量为4g/L时,陶瓷层的耐腐蚀性能最好。

In order to produce and prepare micro-arc oxidation(MAO) coatings with good performance, for raising the corrosion property of 2 A12 aluminum alloy for offshore engineering, the test uses adding different concentrations of nano-MoS2 particles(0 g/L, 1 g/L, 2 g/L, 4 g/L, 6 g/L, and 8 g/L) by MAO technology. The microstructure of the MAO coatings are observed by scanning electron microscopy. The wear resistance and corrosion resistance of the coatings are analyzed by wear and electrochemical corrosion tests. The size of micropores on the coating surface is reduced and the amount of micropores increases with the increase of MoS2 particle content. The micropores are distributed evenly and the density of the coating was been greatly improved. Further, the thickness of the coating is first increased and then decreased with the increasing of MoS2 particles. The friction coefficient of the MAO coating decreases. The coefficient of friction of the coating is stable at 0.45 or so. When the particle content of MoS2 is 4 g/L, the corrosion and wears resistance of the coating is the best.