Process characteristics of micro-arc oxidation:
Micro-arc oxidation evolved from anodizing but 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 of micro-arc oxidation is simple and versatile for 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 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 thin layer formed by micro-arc oxidation has a hardness and wear resistance that can exceed quenched steel and hard alloy, hence, 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. The ceramic layer generated by surface micro-arc oxidation can be applied to the surface of aluminum alloy components subject to high-speed movement.
2. Abrasion-Reduced Surface
After micro-arc oxidation, the material surface can form a ceramic layer with micropores, which can reduce the friction coefficient to 0.06~0.12 when using traditional lubricants. Filling solid lubricants into the micropores further enhances the friction and wear reduction effects, making it suitable for applications like automotive and motorcycle pistons, or any situation requiring a low friction coefficient.
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 components that require 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, capable of absorbing or reflecting over 80% of light energy, suitable for solar heat collectors or heat sinks for electronic components. Aluminum, magnesium, titanium, and their alloys can be used to form colored ceramic surfaces, which can serve as high-end decorative materials for phone cases and the like.
