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How to reduce coloring defects in aluminum anodic oxidation

Release time:

2022-05-16 16:12

With the vigorous development of the aluminum processing industry, aluminum oxidation has become an indispensable and important production link in the aluminum processing process. The generation of color difference in electrolytic coloring of aluminum is directly related to the coloring mechanism, the uniformity and structure of the thickness of the oxide film and the speed of electrolytic coloring.

The defects of aluminum coloring generally have the following situations: light color, color difference, no color, white spots, white, dyed hair, color escape, etc. How to solve this problem, which requires aluminum oxidation treatment plant, in the electrolytic coloring surface treatment of profiles, to study and prevent.

To color uniform and stable and the color difference control in a certain range, reduce the generation of coloring defects, in the actual production process, first of all, to strengthen the control of anodic oxidation process operation, in the operation of the following aspects of the requirements:

1. When the anodized aluminum profile enters the coloring groove, it must maintain a large inclination and be placed in the middle of the two poles to ensure that the left and right pole distances are equal.

The coloring voltage of the same color must be equal, and the power supply voltage should be adjusted in advance before coloring.

3. At the end of coloring, it is necessary to lift immediately, drain all the tank liquid as soon as possible, transfer to the water tank for washing as soon as possible, do not stay in the coloring tank, strictly control the lifting time in the air, and fully wash the acid liquid in the inner hole of the profile before comparing colors with color plates. When comparing colors, the color of the profile is slightly darker than the sample color. When the color is too light, re-put the coloring tank to electrify the color, when the color is too dark, re-put the coloring tank (not electrified) or the acid tank behind the oxidation tank to fade.

4, anodic aluminum oxidation after coloring, if the workpiece after anodic aluminum oxidation in the air exposure time is too long film pores will shrink, and may be stained with dirt, resulting in dyeing difficulties.

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