Anodizing

  • Alkaline washing flow defect of aluminum alloy anodizing
    Alkaline washing flow defect of aluminum alloy anodizing

    After the alkali washing, the corrosion mark of the flowing alkali solution after drying is seen on the profile, which is easier to see after anodization. The reason is that the concentration of the alkali solution is too high, the temperature of the alkali solution is too high, and the transfer fro

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  • Powdering defects of anodizing of aluminum alloy
    Powdering defects of anodizing of aluminum alloy

    A white powder cream formed on the surface after anodization is called "pulverized". The frost on the surface of the aluminum profile after sealing may be caused by "pulverization" or may occur during the sealing process (heat sealing and cold sealing holes may occur) and should be distinguished. Th

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  • Burning defect of anodizing of aluminum alloy
    Burning defect of anodizing of aluminum alloy

    'Burning' is the appearance of scorching due to excessive current density (possibly local) during anodization. This is a result of local or widespread catastrophic dissolution of the anodized film, and partial or total dissolution of the underlying metal may occur. This is due to the inability to di

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  • Galvanic corrosion defects of aluminum alloy anodizing
    Galvanic corrosion defects of aluminum alloy anodizing

    In the energized tank (anodized or electrolytically colored), due to the galvanic action of the workpiece and the trough (steel trough), or in the non-energized trough (washing or sealing), due to the action of stray current, it will be due to electricity Even corrosion produces or adds a key eclips

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  • Aluminum oxide anodized chloride corrosion defect
    Aluminum oxide anodized chloride corrosion defect

    The presence of a small amount of chloride in the sulfuric acid anodizing bath is also liable to cause pitting, and its appearance is characterized by deep star-shaped black spots, which are denser at the corners of the workpiece or other high current density regions. There is no anodized film at th

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  • Aluminum alloy anodized paper corrosion
    Aluminum alloy anodized paper corrosion

    Paper or cardboard is used to place aluminum or to wrap aluminum to avoid scratches. At this time, if the paper is wet, corrosion spots appear on the surface of the aluminum. When corrugated cardboard is used, a strip of corrosion spots regularly appears at the position where the corrugated board is

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