Research on the growth behavior of scanning microarc oxide film.

Micro-arc oxidation (MAO) is one of the most effective techniques for producing ceramic coatings on metal surfaces and is widely used for metal surface modification. However, energy is wasted due to the dispersion of energy when handling large workpieces. Scanning micro-arc oxidation (SMAO) is a coating process developed based on conventional micro-arc oxidation, where electrode confinement is carried out during the scanning process thus saving energy. In this paper, SMAO is further investigated and simulated using simulation software, which greatly saves the experimental cost. The results show that increasing the number of scans increases the thickness of the micro-arc oxidized film, while the scanning speed is the opposite. Both anodic oxidation and passivation zones exist at the periphery of the SMAO region, the roughness of the SMAO film layer decreases from the center to the edge, and the anodic oxidation reaction mainly occurs at the edge zone of the discharge region. The thickness of the film layer is about 17 um in a single scan, and the thickness of the film layer can reach 50 um after several scans, and there is a porous structure on its surface, which is favorable for the adsorption and diffusion of gas molecules. The results show that SMAO is suitable for producing large-volume and large-area metal surface coating, and it is a feasible metal surface coating process. [ABSTRACT FROM AUTHOR]