铝合金表面阳极氧化膜的制备及其摩擦性能  

Preparation and Friction Behavior of Anodic Oxidation Coating on the Surface of Aluminum Alloy

作　　者：张栋[1] 张文静[1] 乐永康[1] 李炼[1] 

机构地区：[1]苏州有色金属研究院有限公司,江苏苏州215026

出　　处：《材料保护》2009年第3期9-11,14,共4页Materials Protection

摘　　要：为了提高铝合金表面耐磨性能并降低摩擦系数,对其进行自润滑表面处理。利用铝合金阳极氧化膜耐磨的特性及多孔的形貌,研究制备既具备高耐磨性又具有大孔径的阳极氧化膜工艺,并采用超声处理结合热浸渍的方法向纳米孔中填充聚四氟乙烯(PTFE)润滑颗粒。通过对草酸、磷酸+有机酸和草酸+磷酸+柠檬酸3种体系的氧化液制备出的氧化膜性能的比较,选用草酸、磷酸、柠檬酸的混合酸对铝合金进行阳极氧化,形成了厚为28.2μm,维氏硬度为236.4的硬质氧化膜,其氧化膜孔径大小约为90nm。经过润滑颗粒填充处理和热处理之后在铝合金表面制备出了结合良好的自润滑膜,其表面摩擦系数为0.135。该表面处理方法实现了铝合金表面的自润滑。Anodic oxi-dation coatings with good wear resistance and large size pores were fabricated on the surface of Al alloy by anodizing in oxalic acid e-lectrolyte containing phosphoric acid. Polytetrafluoroethylene ( PT-FE) particulates were incorporated into the pores of the anodic ox-idaiton coatings by ultrasonic vibration and hot-dip impregnation so as to endow the coatings with self-lubricity and improve the friction -reducing and antiwear properties. The morphologies and friction behavior of the anodic oxidation coatings were investigated. Resultsindicate that the anodic oxidation film had a thickness of 28.2 μm,Vickers-hardness of 236. 4,and pore size of about 90 nm After introduction of PTFE particulates into the pores of the anodic oxide coatings,the resulting self-lubricating film was well adhered to Al substrate and had a friction coefficient of 0.135,showing good self-lubricity for Al and its alloys.

关 键 词：阳极氧化膜 铝合金 纳米孔 热浸渍 填充 自润滑 摩擦性能 

分 类 号：TG174.451[金属学及工艺—金属表面处理]