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Coloring | Aluminum Profile

Release time:

2021-04-13 15:56

With the development of aluminum processing technology, the component of aluminum used in people's lives is getting higher and higher, and the color is no longer as monotonous as before. Aluminum can color the color you want. The following is a brief introduction to coloring related knowledge by the small editor of Baianmei Company.

1. how to give aluminum shell color?

The density of aluminum is only 2.7g/cm³, about 1/3 of the density of steel, copper or brass (7.83g/cm³ and 8.93g/cm³ respectively). After surface treatment, aluminum can exhibit excellent corrosion resistance under most environmental conditions, including in air, water (or salt water), petrochemicals, and many chemical systems.

(1) Surface pretreatment:

The surface of aluminum is cleaned by chemical or physical methods, and the pure matrix is exposed, so as to obtain a complete and dense artificial oxide film. A specular or matte (matte) surface can also be obtained by mechanical means.

(2) Anodizing:

After surface pretreatment of aluminum, the surface of the substrate is anodized under certain process conditions, resulting in a dense, porous, strong adsorption Al2o3 film layer.

(3) Aluminum oxide film sealing:

The pores of the porous oxide film generated after anodic oxidation are closed, so that the anti-pollution, corrosion resistance and wear resistance of the oxide film are enhanced. The oxide film is colorless and transparent. Using the strong adsorption of the oxide film before sealing, some metal salts or organic dyes are adsorbed and deposited in the pores of the film, which can make the appearance of aluminum appear in many colors other than natural color (silver white), such as black, bronze, golden yellow and stainless steel.

 

Causes and Treatment Methods of 2. Aluminum Workpiece Dyeing Without Coloring

1. Insufficient anodic oxide film thickness: The solution is to check whether the anodic oxidation process is standardized and see whether the temperature, voltage, conductivity and other factors are stable. If there is any abnormality, please adjust the specification accordingly. If there is no abnormality, the oxidation time can be appropriately extended to ensure the film thickness reaches the standard.

2. The PH value of the dye solution is too high: at this time, glacial acetic acid can be used to adjust the PH value to the standard value.

3. After oxidation, the workpiece is placed in the water tank for too long: timely dyeing is advocated. If this situation has occurred, the workpiece can be placed in the anodizing tank or the nitric acid neutralization tank for proper activation treatment before dyeing, and the effect will be very good.

4, the choice of dye has been decomposed or mildew: at this time need to replace the dye, select the appropriate dye.

5, the oxidation temperature is too low, resulting in dense film: the oxidation temperature can be appropriately increased.

6. Poor conductivity: The anode copper rod or cathode lead plate may be in poor contact with the batch shown in poor conductivity. Pay attention to clean the anode copper rod and cathode lead plate to ensure good conductivity.

Aluminum has become a common material in the global automotive, electronics, construction and other fields. People have higher and higher requirements for the beauty of products. Baianmei will continue to introduce more high-quality aluminum dyes for everyone. Thank you for your support.

Coloring, aluminum, anode, dye, temperature, surface treatment, aluminum anodizing