Method of oxidation on the surface of aluminum profiles

1. Natural oxidation.

Aluminum alloy profiles in the natural environment and oxygen in the air will react, the surface forms a layer of alumina protection layer, organized the internal substrate and oxygen continue to react. And this layer of protection is transparent, we call it the oxide film. Natural oxidation of the film is uneven, color is not good, corrosion resistance is not strong.

2. Chemical oxidation.

The surface degreasing aluminum alloy profile into the oxidant and active agent oxidation solution to react, the role of the active agent is to make the oxidation film in the production process partially dissolved, creating pores, so that oxidation continues, oxidation film can be thickened. There are many kinds of oxidation solutions, often with chromate as oxidant and carbonate as active agent. The advantages of chemical oxidation are easy to control and easy to operate. The disadvantage is that the cost is higher, will cause environmental pollution, and through chemical oxidation of the oxide film is thinner, low production capacity.

3. Anodized oxidation.

Put the aluminum profile in an acidic electrolyte solution, as an anode, through high-voltage direct current, so that anions move to the anode, and in the anode to produce fresh oxygen and anode aluminum alloy to produce an oxidation film. Acids in electrolytes can partially dissolve the oxidation film, creating pores, so that the oxidation reaction can develop in depth. This method makes the surface of aluminum a porous structure, can be a variety of coloring treatment, and can be used as a spray-painted bottom layer. The advantages of anode oxidation are the thickness of the oxidation film, more resistant to corrosion, and can be processed in bulk. The disadvantage is still pollution of the environment. Therefore, oxidation enterprises must set up sewage treatment tanks, to meet the standards of emissions.