Process characteristics of micro-arc oxidation:
Micro-arc oxidation is a development from anodization, but it offers many advantages not present in anodization. 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 process of micro-arc oxidation is straightforward and versatile for material treatment.
Properties and characteristics of micro-arc oxidation ceramic film:
Micro-arc oxidation surface treatment technology differs from anodic surface oxidation technology, and the ceramic coating formed is far superior in terms of functionality and performance compared to anodic oxidation coatings. Depending on the material composition of the workpiece, the composition of the working fluid, the pulse waveform, and process parameters, the ceramic layer on the surface after micro-arc oxidation exhibits a variety of functions and different application ranges, generally as follows:
1. High hardness, high strength
The ceramic thin layer formed by micro-arc oxidation has hardness and wear resistance that can exceed quenched steel and hard alloys. Therefore, in aerospace, aviation, or products requiring lightweight, aluminum alloys can be used to manufacture valve sleeves, cores, and cylinders for pneumatic and hydraulic servo valves. On the surface of aluminum alloy spool components in high-speed motion, the ceramic layer generated by surface micro-arc oxidation can be used.
2. Abrasion-resistant surface
Due to micro-arc oxidation, the surface of the material can form a ceramic layer with micropores, reducing the coefficient of friction to 0.06~0.12 when using traditional lubricants. Filling solid lubricant in the micropores 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 coefficient of friction.
Due to the ceramic coating on the surface, the aluminum alloy can withstand high temperatures of up to 800~900°C, even 2000°C, in a short period, thereby enhancing the working temperature of aluminum, magnesium, titanium, and other alloy components. It is suitable for components that require instant heat resistance, such as rocket and cannon parts.
3. Light Absorption and Light Reflective Surface
Create ceramic layers in various colors and performance levels, such as black or white, with energy absorption or reflection rates exceeding 80%. These can be used for solar heat collectors or as heat sinks for electronic components. Colored ceramic surfaces made of aluminum, magnesium, titanium, and their alloys can serve as high-end decorative materials for mobile phone shells and similar applications.
