Process characteristics of micro-arc oxidation:
Micro-arc oxidation is a development from anodic oxidation, but it boasts many advantages not present in anodic oxidation. The micro-arc oxidation setup is relatively simple, with electrolytes typically alkaline, resulting in minimal environmental pollution. The temperature range for the solution is wide. The process of micro-arc oxidation is straightforward and versatile for various materials.
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 composition of the workpiece material, working fluid, pulse waveform, and process parameters, the ceramic layer on the surface after micro-arc oxidation boasts a variety of functions and different application scopes, generally as follows:
1. High hardness, high strength
The ceramic layer formed by micro-arc oxidation has a hardness and wear resistance that can exceed淬火钢、hard alloys, thus, 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, the ceramic layer generated by surface micro-arc oxidation can be utilized.
2. Reduced friction surface
Due to micro-arc oxidation, a ceramic layer with micropores forms on the material surface, which can reduce the coefficient of friction to 0.06~0.12 when using traditional 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 other scenarios requiring low friction coefficients.
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. They are suitable for instantaneous parts in applications such as rockets and cannons.
3. Light Absorption and Light Reflective Surface
Create ceramic layers in various performance levels and colors, such as black or white, which can absorb or reflect 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-end decorative materials for mobile phone shells.
