10 Mar , 2025
Blog
Causes and solutions to the problem of color spots on anodized aluminum plates
As the core material for building curtain walls, electronic equipment and high-end home furnishings, anodized aluminum plates are favored for their advantages such as lightweight and corrosion resistance. However, the problem of color spots has long plagued the industry – uneven oxide film, local corrosion, sealing defects, etc., directly lowering the product grade and even causing customer complaints. The formation of color spots on anodized aluminum plates may involve multiple aspects such as materials, processes, equipment and environment. ◆ First, in terms of materials, uneven aluminum alloy composition will lead to different oxidation reaction rates in different areas, resulting in color spots. ◆ Secondly, incomplete surface pretreatment, such as oil, oxide scale, dust, etc., will cause uneven growth of the oxide film and form color spots. ◆ In addition, improper control of process parameters such as oxidation tank liquid composition, temperature, current density, oxidation time, etc. will also lead to the appearance of color spots. What should be paid attention to when selecting and processing aluminum alloy materials? First of all, aluminum alloy materials with uniform composition should be selected. When purchasing, the quality inspection report of aluminum plates and aluminum coils should be checked to ensure uniform distribution of...
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