Process characteristics of micro-arc oxidation:
Micro-arc oxidation evolved from anodizing but possesses 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.
Micro-arc oxidation ceramic film performance and features:
Micro-arc oxidation surface treatment technology differs from anodizing, and the ceramic film formed is far superior in terms of functionality and performance to the anodized film. Depending on the composition of the workpiece material, the composition of the working fluid, the pulse waveform, and the process parameters, the ceramic layer on the surface after micro-arc oxidation possesses a variety of functions and different application scopes, generally as follows:
1. High hardness, high layer
The ceramic layer formed after micro-arc oxidation has a hardness and wear resistance that can exceed hardened 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. 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. Reduced friction surface
Due to micro-arc oxidation, a ceramic layer with micropores can form on the material surface, reducing the friction coefficient to 0.06~0.12 when using traditional lubricants. Filling solid lubricants in the micropores further enhances the friction and wear reduction, suitable for applications like automotive and motorcycle pistons, or any situation requiring a low friction coefficient.
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 requiring instantaneous performance, such as in rockets and cannons.
3. Light Absorption and Light Reflective Surface
Create ceramic layers in various colors and performance levels, such as black or white, with over 80% light absorption or reflection capability. Suitable for solar heat absorbers or heat sinks for electronic components. Aluminum, magnesium, titanium, and their alloys can be used to form colorful ceramic coatings, which can serve as high-end decorative materials for mobile phone shells and the like.
