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Views: 222 Author: Carie Publish Time: 2025-07-19 Origin: Site
After aluminum alloy undergoes anodizing treatment, an oxide film is formed that is resistant to oxidation, rust, corrosion, and wear. Furthermore, this oxide film is extremely stable in natural ecological environments, effectively protecting the surface of aluminum alloy products. The outer layer of the anodized aluminum oxide film is porous, making it easy to absorb dyes and colored substances. This allows for coloring and improves its decorative properties. After sealing the oxide film with hot water, high-temperature steam, or nickel salt, its corrosion resistance and wear resistance can be further enhanced.
Currently, the main issues with coloring aluminum profiles include: light color, color difference, inability to dye, white spots, exposed white areas, mottled coloring, and color fading. How can these problems be addressed to ensure consistent color in each batch of products?
This requires technical personnel in enterprises to conduct research and take preventive measures during electrolytic coloring surface treatment of aluminum profiles. Below are the causes and solutions for the issues of light color and color difference in anodized aluminum profiles:
1. Uneven oxide film thickness. Possible reason: uneven temperature or concentration of the anodizing bath. Solution: use compressed air agitation to mix the bath thoroughly.
2. Uneven temperature or concentration of the dye solution. Introduce agitation and increase the number of agitations.
3. Dyeing is too fast. The bottom of the workpiece enters and leaves the dye solution first, leading to deeper color at the bottom. Solution: dilute the dye and appropriately extend the dyeing time.
4. Poor conductivity. May be caused by loose fixtures. Ensure fixtures are tightened properly to avoid this issue.
5. Dye solution is too dilute. Add more dye to increase the concentration.
6. Dye solution temperature is too low. Heat the dye solution to below 60℃.
7. Improper dye dissolution or undissolved dye floating, which easily leads to color differences. The solution is to improve dye dissolution.
Additionally, it is important to note: The temperature during the anodizing process of aluminum profiles significantly affects the properties of the oxide film. If the temperature is too high, wear resistance and corrosion resistance of the oxide film are reduced, and film formation becomes difficult. If the temperature is too low, the transparency of the film decreases, coloring performance is poor, brittleness increases, and cracking is more likely.
