Process characteristics of micro-arc oxidation:
Micro-arc oxidation evolved from anodizing but offers many advantages not found in traditional anodizing. The micro-arc oxidation equipment is simpler, the electrolyte is mostly alkaline, and it has a minimal environmental impact. The solution temperature can vary over a wide range. The process of micro-arc oxidation is simpler and more 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 fluid, the pulse waveform, and process parameters, the ceramic layer formed after micro-arc oxidation exhibits various functions and different application scopes, generally as follows:
1. High hardness, high layer
The ceramic thin layer formed after micro-arc oxidation has a 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, valve cores, and cylinders for pneumatic and hydraulic servo valves. On the surface of aluminum alloy spindle components in high-speed motion, a ceramic layer 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 is formed on the material surface, which can reduce the friction coefficient to 0.06~0.12 when using traditional lubricants. Filling solid lubricants into 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 friction coefficient.
Due to the ceramic coating on its surface, the aluminum alloy can withstand high temperatures of up to 800~900°C, even 2000°C, in a short period, thereby enhancing the operating temperatures of alloy components like aluminum, magnesium, and titanium. It is suitable for instantaneous parts in rockets, cannons, and other 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. Colored ceramic surfaces made from aluminum, magnesium, titanium, and their alloys can serve as high-end decorative materials for phone casings and the like.
