Anodized aluminum: Common problems and Analysis

2024-06-18 16:51:01

Anodized aluminum is aluminum or aluminum alloy electrolyzed in aqueous solutions such as sulfuric acid, oxalic acid, and chromic acid to form an oxide film on the surface (thickness is generally 3-15 microns). Anodized coatings have high adsorption capacity, easy sealing and coloring, corrosion resistance, and beautiful appearance.

Anodized aluminum is widely used in our lives, whether it is aircraft parts, automotive decorative parts, building curtain walls or electronic product shells. It is usually supplied in the form of anodized aluminum sheets or anodized aluminum coils, and processed aluminum parts can also be directly anodized.

There may be some problems in the anodizing process. This article explores the common problems and solutions of aluminum and aluminum alloys in the anodizing process.

Common problems and Analysis

◆Uneven film thickness: It may be caused by uneven current distribution, poor contact between the workpiece and the electrode, etc.

◆Insufficient film hardness: This may be related to improper oxidation process parameter settings, electrolyte composition problems, etc.

◆Spots or flaws on the surface: It may be caused by incomplete pretreatment, electrolyte contamination, etc.

◆Poor adhesion of the oxide film: The reasons may include aluminum material problems, poor pretreatment or inappropriate oxidation process.

◆Uneven dyeing: It may be caused by improper control of dyeing conditions or inconsistent surface conditions of the workpiece.

Common problems of anodized aluminum

The above are common problems of aluminum in the anodizing process. To solve these problems, it is necessary to strictly control the process conditions, ensure the quality of pretreatment, and regularly maintain and test equipment and electrolytes.


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