How to deal with black lines on aluminum solar frame？

The treatment method for black lines on solar aluminum frame mainly includes the following steps:

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Strictly control the operation process: Before anodizing, strictly control the time, temperature, and concentration of alkali etching and polishing. Ensure thorough cleaning after alkaline etching to avoid black line problems caused by incomplete cleaning.

Maintain the oxidation tank solution: Regularly analyze the concentration and impurity content of the oxidation tank solution, keep the tank solution clean, and avoid black line problems caused by high aluminum ion concentration. Timely replace or handle impurities in the tank solution to ensure the quality of the oxide film.

Pre dyeing treatment: Before dyeing, ensure that the surface of the aluminum alloy is clean to avoid black line problems caused by incomplete cleaning with acidic solutions. Thoroughly clean the aluminum alloy before dyeing to ensure the quality of the dyed film.

Control the thickness of the oxide film: During the anodizing process, control the thickness of the oxide film to avoid stress patterns caused by excessive film thickness. Reasonably control the expansion of the oxide film and reduce the problem of black lines caused by stress.

Use appropriate cleaning agents: Choose the appropriate cleaning agent and avoid using highly corrosive cleaning agents to prevent corrosion on the surface of aluminum alloys, leading to black line problems.

The main reasons for the black lines on the solar aluminum frame are as follows:

Improper pre-treatment: The concentration and temperature of the alkali etching pool are too high, or the alkali etching pool is contaminated, resulting in incomplete cleaning after alkali etching and the formation of black lines.

Improper maintenance of oxidation tank solution: The concentration of aluminum ions in the oxidation tank solution is too high, resulting in a decrease in the quality of the oxide film and the formation of black lines.

Incomplete pre-treatment before staining: Incomplete cleaning before staining results in residual acidic solution and the formation of black lines.

Improper control of oxide film thickness: Stress patterns caused by excessive thickness of oxide film form black lines.

Through the above measures, the black line problem of solar aluminum frames can be effectively addressed and prevented, ensuring their appearance and quality.