High Hardness and Wear Resistance:
The micro-arc oxidation coating is a ceramic layer composed primarily of oxides derived from the metal substrate. For instance, the micro-hardness of a ceramic layer on an aluminum alloy surface can exceed 1200 HV, significantly higher than the substrate's hardness of 150 HV.
Excellent Corrosion Resistance:
The metal-oxide ceramic phase remains stable in corrosive environments. The coating consists of a porous outer layer and a dense inner layer; by controlling the state of the porous layer and applying a subsequent sealing treatment, superior corrosion resistance can be achieved.
Strong Bonding with the Substrate:
The ceramic layer is formed *in situ* on the substrate surface, bonding tightly via metallurgical integration. Subsequent coating treatments further enhance the adhesion of the composite layer, ensuring it does not easily peel off.
Thermal and Electrical Properties:
The primary component of the ceramic layer-aluminum oxide-possesses high thermal conductivity and electrical resistivity, making this process a promising surface treatment for components requiring thermal management and electrical insulation.
Simple and Efficient Process:
The micro-arc oxidation process is straightforward and easy to control. In actual production, electrolyte loss is minimal and the solution is reusable, leading to reduced costs.
Low Requirements for Workpieces and Broad Applicability:
The technology is suitable for substrates with varying surface roughness, structures, and shapes, offering a wide range of applications.
Environmentally Friendly and Sustainable:
The electrolytes used are primarily neutral or weakly alkaline and are free from heavy metals or toxic substances. Most base electrolytes offer a long service life, and wastewater treatment costs are low.
