碳钢表面微弧氧化膜的制备及摩擦磨损性能研究

在碳钢表面利用微弧氧化技术分别在以铝酸盐和硅酸盐为主的电解液体系中制备了氧化膜.用扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)研究了两种氧化膜的结构、元素含量及分布和相组成;用往复摩擦试验机评价了氧化膜的摩擦磨损性能,并对膜层和对偶表面的磨痕进行了表征.结果表明:铝酸盐体系中制得的微弧氧化膜主要由Fe3O4和铁铝尖晶石(Fe Al2O4)组成,而硅酸盐体系制得的微弧氧化膜成膜元素为Fe、Si和O,并且以非晶态存在.干摩擦条件下,铝酸盐体系中制备的微弧氧化膜具有比硅酸盐体系中制备的微弧氧化膜更低的摩擦系数和磨损率,这是由于铝酸盐中制备的氧化膜含有的Fe3O4在摩擦过程中向对偶发生了一定程度的转移,起到了减摩抗磨的作用.

Preparation and Tribological Properties of Plasma Electrolytic Oxidation Coatings on Carbon Steel

In this paper,oxide coatings on carbon steel were prepared from aluminate and silicate-based electrolytes by plasma electrolytic oxidation (PEO) technique. The microstructure,element content/distribution and phase composition were examined by scanning electron microscope,energy dispersive spectrometer and X-ray diffraction. A reciprocating friction and wear test-rig was used to evaluate the tribological properties of PEO coatings. The wear tracks on PEO coatings and counterpart balls were observed. The results indicate that the PEO coating prepared from aluminate-based electrolyte was mainly composed of Fe₃O₄ and spinel FeAl₂O₄ while the PEO coating prepared from silicate-based electrolyte consisted of amorphous Fe,Si and O. The PEO coating prepared from aluminate-based electrolyte exhibited lower frictional coefficient and wear rate than that of PEO coating prepared from silicate-based electrolyte under dry sliding condition. This is because the Fe₃O₄ in the PEO coating prepared from aluminate-based electrolyte transferred to the counterpart ball and had lubrication and anti-wear function.