Micro-arc oxidation process characteristics:

Micro-arc oxidation originated from anodization but has many advantages not found in anodization, with a simpler process, mostly alkaline electrolytes, and minimal environmental pollution. The solution temperature can vary over a wide range. The process of micro-arc oxidation is simple and versatile for 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 ceramic film formed is far more functional and superior in performance compared to the anodizing film. Depending on the composition of the workpiece material, working liquid, pulse waveform, and process parameters, the ceramic layer on the surface after micro-arc oxidation exhibits various functions and different application ranges, generally as follows:

1. High hardness, high strength

Ceramic thin layers formed by micro-arc oxidation have hardness and wear resistance that can exceed quenched steel 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 components subjected to high-speed movement, ceramic layers generated by surface micro-arc oxidation can be applied.

2. Abrasion-Reduced Surface

Due to the micro-arc oxidation process, a ceramic layer with micropores forms on the material surface, reducing the coefficient of friction to between 0.06 and 0.12 when using conventional lubricants. Filling solid lubricants in the micropores further enhances the friction and wear reduction, making it suitable for applications such as car and motorcycle pistons, or any scenario requiring a low coefficient of friction.

Due to the ceramic coating on the surface, aluminum alloys can withstand high temperatures of up to 800-900°C, even 2000°C in a short period, thus enhancing the operating temperature of aluminum, magnesium, titanium, and other alloy components. They are suitable for rocket, cannon, and other components requiring instantaneous performance.

3. Light Absorption and Light Reflective Surface

Create ceramic layers in various performance levels and colors, such as black or white, capable of absorbing or reflecting over 80% of light energy, suitable for solar heat absorbers or heat sinks for electronic components. Colored ceramic surfaces made of aluminum, magnesium, titanium, and their alloys can serve as high-decorative materials for phone casings and similar applications.