8407钢渗铝氧化处理形成的氧化膜组织与结构

对渗铝后的8407钢试样进行常温硬质阳极氧化处理,使其表面形成氧化膜。通过金相显微镜观察氧化膜横截面组织,并探讨了氧化膜的形成机制;采用扫描电镜观察氧化膜表面形貌,并检测氧化膜沿厚度方向的化学成分及其分布;利用X射线衍射仪对氧化膜相组成进行分析。结果表明,渗铝8407钢经过常温硬质阳极氧化后,试样表面分为3层,从基体向外侧依次为基体、渗层、氧化膜。氧化膜连续致密,厚度均匀,与基体结合紧密,其主要成分为O、Al和Fe,且各元素分布均匀,主要相组成为Fe3O4和Al2O3。

Microstructure and texture of oxide film on 8407 steel formed by aluminization and oxidation treatment

Room-temperature hard anodization treatment was carried out for aluminized 8407 steel sample in order to form an oxide film on the surface.The sectional microstructure was observed by means of OM to explore the formation mechanism of the oxide film.The surface morphology of the film was observed under SEM,chemical compositions and their distribution along the direction of thickness were also examined.The phase component in the film was analyzed by using XRD.The results show that,after room-temperature hard anodizing for the aluminized 8407 steel,the sample surface is divided into three layers,which followed by substrate,aluminization layer and oxide film from the substrate to the outer surface.The uniform,compact and tightly united film mainly consists of O,Al and Fe elements which distribute homogeneously in the film,and its phases are mainly composed of Fe3O4,Al2O3.