Micro-arc oxidation process characteristics:

Micro-arc oxidation evolved from anodizing but offers many advantages not found in traditional anodizing processes. The micro-arc oxidation equipment is simpler, the electrolyte is mostly alkaline, and it has minimal environmental impact. The solution temperature can vary over a wide range. The micro-arc oxidation process is straightforward and versatile for various materials.

Properties and characteristics of micro-arc oxidation ceramic film:

Micro-arc oxidation surface treatment technology differs from anodizing surface oxidation technology, and the ceramic coatings formed are far more functional and superior in performance compared to anodized coatings. Depending on the composition of the workpiece material, the working fluid, pulse waveform, and process parameters, the ceramic layer formed after micro-arc oxidation possesses various functions and different application scopes, generally as follows:

1. High hardness, high density

The ceramic thin layer formed by micro-arc oxidation has a hardness and wear resistance that can exceed hardened 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. The ceramic layer generated by surface micro-arc oxidation can be applied to the surface of aluminum alloy components in high-speed motion.

2. Abrasion-resistant surface

Due to the micro-arc oxidation, the material surface forms a ceramic layer with micro-pores, reducing the coefficient of friction to 0.06~0.12 when using traditional lubricants. Filling solid lubricant in the micro-pores further enhances the friction and wear reduction, suitable for applications like 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 alloy components like aluminum, magnesium, and titanium. Suitable for instantaneous parts in rockets, cannons, and similar applications.

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. These can be used for solar heat absorbers or heat sinks for electronic components. Aluminum, magnesium, titanium, and their alloys can be made into colored ceramic surfaces, serving as high-end decorative materials for phone casings and more.