Aluminum Anodizing Sealing Process

The aluminum oxide film is a porous film. Regardless of whether it is colored or not, it must be sealed before being put into use, so as to improve its corrosion resistance and weather resistance.

There are three types of treatment methods, namely high temperature hydration reaction sealing, inorganic salt sealing and organic sealing.

(1) High temperature water seal

This method uses the hydration reaction of aluminum oxide film and water to change the amorphous film into a hydrated crystalline film:

The hydration reaction can be performed at normal temperature and high temperature, but at high temperature, especially at the boiling point, the resulting hydrated crystalline film is a very stable and irreversible crystalline film. Therefore, the most commonly used aluminum oxide film sealing treatment is boiling water. Process or steam process.

(2) Sealed by inorganic salt

The inorganic salt method can improve the fastness of organic coloring dyes, so it is commonly used in chemical coloring methods.

1. Acetate method
2. Silicate method

(3) Organic closed method

This is to immerse the aluminum oxide film by oil immersion, varnishing, or painting, etc., because the cost is higher and the process is increased, it is not widely used. Most of the two methods are used, and the first high temperature Hydration is mainstream.

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