Process characteristics of micro-arc oxidation:
Micro-arc oxidation is derived from anodizing, but it has many advantages not possessed by anodizing in terms of process. The micro-arc oxidation equipment is relatively simple, the electrolyte is mostly alkaline, and it has minimal environmental impact. The solution temperature can vary over a wide range. The process flow of micro-arc oxidation is simple and 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 ceramic film formed is far superior in terms of functionality and performance compared to anodized films. 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 offers a variety of functionalities 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 in high-speed motion, the ceramic layer generated by surface micro-arc oxidation can be utilized.
2. Abrasion-resistant surface
Due to the micro-arc oxidation process, a ceramic layer with micro-pores forms on the material surface, reducing the coefficient of friction to between 0.06 and 0.12 when using traditional lubricants. Filling solid lubricants in the micro-pores 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 working temperature of alloy components like aluminum, magnesium, and titanium. They are suitable for parts requiring instantaneous operation, such as in rockets and cannons.
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. They can be used in solar heat collectors or as heat sinks for electronic components. Colorful ceramic surfaces made from aluminum, magnesium, titanium, and their alloys can serve as high-end decorative materials for phone cases and the like.
