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Why is the method of treating metal casings using micro-arc oxidation not widely used?

Anebon Metal Products Co.,Ltd | Updated: Sep 30, 2018

Why is the method of treating metal casings using micro-arc oxidation not widely used?

brass CNC part,Die Casting,Heat sink,Machining part,Metal stamping,Milling part,Turning part

I am doing my own anodization, and I am working with lab friends on micro-arc oxidation. We are all engaged in aerospace grade aluminum alloys. He sometimes uses magnesium alloys.

Micro-arc oxidation requires a special power supply to control buck - boost rate, voltage and waveform. (The circuit diagram of the power supply has been shown to me. As a material, I vomit blood, I don't want to see it again. I don't know about it!), by contrast. Anodizing can be used for DC or AC and has a transformer. His power is the size of a small freezer, my printer is so big...

He uses 300~500 V, I usually 15V...

It is necessary to know that each technology has its own advantages and disadvantages. Although micro-arc oxidation can obtain a hard oxide film layer, power consumption and violent reaction are very intense.

Micro-arc oxidation is very beautiful. After power-on, reach a certain stage. The surface of the aluminum alloy is fired with silver and silver, and some beautiful sparks are ejected, accompanied by an increase in temperature. Without control, material structure and performance are severely affected.

The entire reaction process requires many control conditions such as elevated pressure, temperature, oxidizing bath composition and uniformity. Of course, anodizing should also consider these issues, but because the micro-arc oxidation reaction is very serious, it is more difficult to control. .

This violent reaction process is not easy to carry out, and it is extremely troublesome. At present, it is difficult to produce large parts, a large amount, and a high cost.

Micro-arc oxidation forms a high-strength protective film on the surface of the substrate, which can greatly improve the corrosion resistance and wear resistance of the aluminum alloy. At the same time, this violent reaction process will greatly affect the matrix. Mechanical properties, especially fatigue properties. - That is to say, even if this technique can obtain a surface with good texture, it does not mean that it has an inevitable advantage over anodization, and it depends on the occasion of use.

For example, aluminum alloy structural members do not use such excellent corrosion resistance, but they are never used due to fatigue properties.

Specific to the phone, probably because it is expensive.

In fact, in the lab, you can't see the world outside. In general, the field of scientific research is far from industrialized. Micro-arc oxidation is a research hotspot and has not been widely used.

In fact, there is a trade-off between anodization and micro-arc oxidation. The so-called hard anodization should be cheaper, more suitable, and the technology is not expensive.

Finally, I like that my phone case is made of engineering plastic. I don't like aluminum alloy. The metal is prone to plastic deformation and is not aesthetically pleasing when it falls into the pit. The surface wear resistance is good, I don't think it matters.