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What are the methods for surface oxidation of decorative aluminum profiles?

Update time : 2023-06-19 11:10:27

Sometimes it is found that there are different degrees of spotty dark gray corrosion points on the surface of decorative aluminum profiles, which are completely different from the corrosion points caused by zinc elements, and are intermittent in the production process of decorative aluminum profiles. Then there are a variety of surface treatment methods for such aluminum profiles, currently using high-temperature wood grain transfer printing, spray oxidation, coating and other methods. Aluminum oxide film can protect aluminum profiles from corrosion, which is the main reason for the corrosion resistance of aluminum profiles. Let us look at the methods of surface oxidation of decorative aluminum profiles.

1. Natural oxidation

Natural oxidation refers to the decorative aluminum profiles which react with oxygen in the air in the natural environment, forming a protective layer of alumina on the surface and allowing the internal substrate to continue to react with oxygen - the formation of the protective layer is transparent, i.e. an oxide film. The naturally oxidized oxide film is not uniform, the color is not good, the corrosion resistance is not strong, and it is rarely used now.

2. Anodizing

Anodization is the placement of decorative aluminum profiles as an anode in an acidic electrolyte, which, through high voltage direct current, migrates negative ions to the anode and produces a new oxygen and aluminum oxide film on the anode. In the electrolyte, the acid can dissolve the oxide film locally, and create pores, so that the oxidation reaction can be further developed. The method makes the aluminum surface form a porous structure, which can be treated with various coloring and can be used as the bottom layer of spraying coating. The advantages of anodic oxidation are large oxide film thickness, good corrosion resistance, higher grade, and batch processing.

3. Chemical oxidation

Chemical oxidation refers to the decorative aluminum profiles after the deoiling and ash removal on the surface of the aluminum alloy into the oxidation solution of the oxidant and active agent to form an artificial oxide film, its role is to partially dissolve the oxide film during the formation process, resulting in pores, so that the oxidation continues, and the oxide film becomes thicker. There are many kinds of oxidizing fluids, which usually use chromate as oxidant and carbonate as activator. The chemical oxidation method has the advantages of easy control and convenient operation, but the disadvantages are high cost, environmental pollution, thin oxide film produced by chemical oxidation and low production capacity.

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