氧化石墨烯对钛合金微弧氧化膜耐磨损与腐蚀性影响

Effect of Graphene Oxide on Wear and Corrosion Characteristics of Micro Arc Oxidation Coating on Titanium Alloy

为改善Ti-5Al-1V-1Sn-1Zr-0.8Mo合金微弧氧化膜的耐磨和耐腐蚀性,向电解液中添加0~1.00 g/L的氧化石墨烯制备微弧氧化膜。对微弧氧化膜的厚度、粗糙度、微观形貌及组成进行了表征,并对膜层的耐磨性及耐腐蚀性进行了测试分析。结果表明,随着氧化石墨烯加入量增加,氧化膜厚度从102.3μm增加为115.3μm,粗糙度从56.7μm减小为32.9μm;未加入氧化石墨烯时,膜层表面的微孔直径为10~60μm,且有大量微裂纹,随着氧化石墨烯的加入,微孔直径减小,在加入量为0.75和1.00 g/L时,微孔直径稳定于10~20μm;XRD结果显示,加入氧化石墨烯后,膜层中的金红石相TiO2含量略有增加,磨损过程中膜层质量损失较未加入时有了显著的降低;加入0.75 g/L的氧化石墨烯后,膜层与基体合金的结合力最大,达到53.3 N,较未加入氧化石墨烯的膜层增加了6.2 N;经盐雾腐蚀480 h后,氧化石墨烯加入量为0.75和1.00 g/L的膜层具有更好的耐腐蚀性能。

In order to improve the wear and corrosion resistance of micro arc oxidation(MAO)coating on Ti-5Al-1V-1Sn-1Zr-0.8Mo alloy,0-1.00 g/L graphene oxide(GO)was added to the electrolyte to prepare micro arc oxidation coating.The thickness,roughness,micro morphology and composition of MAO coating were characterized,and the wear and corrosion resistance of the coating were tested and analyzed.The results show that with the increase of GO content,the thickness of coating increases from 102.3μm to 115.3μm.The roughness reduces from 56.7μm to 32.9μm.The diameter of micropore on the surface of the coating is about 10-60μm without GO in electrolyte,and it decreases with the addition of GO.With 0.75 and 1.00 g/L GO,the diameter of micropore is stable at 10-20μm.XRD results show that the content of rutile TiO2 in the coating increases slightly with GO in eletrolyte,and the mass loss of the coating during wearing is significantly lower than that without GO.With 0.75 g/L GO,the binding force between coatings and substrate alloy is the largest,reaching to 53.3 N,which is 6.2 N higher than that without GO.After salt spray corrosion for 480 h,the coatings with GO content of 0.75 and 1.00 g/L have better corrosion resistance.