Micro-arc oxidation process characteristics:
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 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, and the ceramic film formed is far more functional and superior in 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 formed after micro-arc oxidation exhibits a variety of functions and different application scopes, roughly as follows:
1. High hardness, high layer
The ceramic layer formed by micro-arc oxidation has a hardness and wear resistance that can exceed淬火钢、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. The ceramic layer generated by surface micro-arc oxidation can be applied to the surface of aluminum alloy spindle components in high-speed motion.
2. Abrasion-resistant surface
Due to micro-arc oxidation, the surface of the material can form a ceramic layer with micropores, which can reduce the coefficient of friction to between 0.06 and 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 automotive and motorcycle pistons, or any 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 short periods, thereby increasing the operating temperature of aluminum, magnesium, titanium, and other alloy components. They are suitable for use in rocket and cannon parts that require instantaneous performance.
3. Light Absorption and Light Reflective Surface
Create ceramic layers in various colors and performance levels, such as black or white, capable of absorbing or reflecting over 80% of light energy. They are suitable for solar heat collectors or as 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 shells and the like.
