Sealing Process For Anodizing Aluminum

Aluminum oxide film is porous film, whether there is no coloring treatment, before being put into use should be closed treatment, so as to improve its corrosion resistance and weather resistance. There are three kinds of treatment methods, namely high temperature hydration reaction sealing, inorganic salt sealing and organic sealing.

(1) High temperature water closure

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

Hydration reaction can be carried out at room temperature and high temperature, but at high temperature, especially at the boiling point, the hydration crystallization film generated is a very stable and irreversible crystallization film, therefore, the most commonly used closed treatment of aluminum oxide film is boiling water or steam treatment.

(2), inorganic salt closed

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 closure method

This is the aluminum oxide film for oil immersion, paint immersion or coating, due to the high cost and increased process flow, so it is not used, more or the above two types of methods, and the first kind of high temperature water method as the mainstream.

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