Process characteristics of micro-arc oxidation:

Micro-arc oxidation evolved from anodic oxidation but possesses many advantages not found in anodic oxidation. The micro-arc oxidation apparatus is simpler, with the electrolyte mostly alkaline and having minimal environmental impact. The temperature range of the solution can vary widely. The process of micro-arc oxidation is relatively simple and versatile in material application.

Properties and characteristics of micro-arc oxidation ceramic film:

Micro-arc oxidation surface treatment technology differs from anodizing surface oxidation technology, and the resulting ceramic coating also boasts more functions and superior performance compared to anodized coatings. Depending on the material composition of the workpiece, the composition of the working liquid, the pulse waveform, and process parameters, the ceramic layer on the surface after micro-arc oxidation has various functions and different application scopes, roughly as follows:

1. High hardness, high strength

Ceramic thin layers formed by micro-arc oxidation have hardness and wear resistance that can exceed淬火钢 and hard alloys. Therefore, in aerospace, aviation, or applications requiring lightweight products, aluminum alloy can be used to manufacture valve sleeves, cores, and cylinders for pneumatic and hydraulic servo valves. On the surface of aluminum alloy spindle components in high-speed motion, ceramic layers generated by surface micro-arc oxidation can be applied.

2. Wear-Reducing Surface

Due to the micro-arc oxidation process, the material surface forms a ceramic layer with micro-pores, which can reduce the friction coefficient to 0.06~0.12 when using traditional lubricants. Filling solid lubricants in the micro-pores further enhances the friction and wear reduction, making it suitable for applications such as automotive and motorcycle pistons, or any other scenarios requiring a low friction coefficient.

Due to the ceramic coating on the surface, aluminum alloys can withstand high temperatures of up to 800~900°C, even 2000°C in short periods, thus increasing the working temperature for alloy components like aluminum, magnesium, and titanium. They are suitable for instantaneous parts in rockets, cannons, and similar applications.

3. Light Absorption and Light Reflective Surface

Create ceramic layers with varying performance and colors, such as black or white, capable of absorbing or reflecting over 80% of light energy. They are suitable for solar heat absorbers or heat sinks for electronic components. Colored ceramic surfaces made from aluminum, magnesium, titanium, and their alloys can serve as high-end decorative materials for phone shells and the like.