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What influences the final color of anodized aluminum alloy?

350 Published by admin Jun 28,2019

Do you know what factors affect the final color of anodized aluminum alloy?Now let me explain to you, the main factors affecting the final color of anodized aluminum alloy are as follows:

1.The degree of coloration of anodized aluminum alloy products depends largely on the formation quality of the oxide film.Therefore, in the sulfuric acid anodic oxidation solution, the influence of impurities on the oxidation film cannot be ignored. The impurities are mainly metal ions such as copper, iron, aluminum and organic impurities and pollutants, which should be removed in time to maintain the normal use of the solution.

anodized aluminum alloy

2.Copper ions will displace and deposit on the surface of aluminum parts, resulting in porosity of oxidation film and reducing transparency, corrosion resistance and electrical insulation performance. Therefore, the content of copper ions is not allowed to exceed 0.02g/L.

3.The chloride ion content should be lower than 0.2g/L in the cooling water after the tap water or the cooling pipe breaks, otherwise the oxide film generated will be rough and loose, and the surface of the aluminum parts will be corroded (breakdown) in serious cases.

anodized aluminum alloy

4.Aluminum ion in aluminum ion electrolyte increases gradually. When the content is more than 25g/L, the conductivity of electrolyte decreases, and the surface of parts presents white spots or massive white spots, and the adsorption capacity of film layer decreases, making dyeing difficult.

5.Iron ions in the iron electrolyte are not allowed to exceed 0.2g/L, or dark streaks will appear.

anodized aluminum alloy

6.Organic impurities will hinder the formation of oxidation film, film adsorption of oil, resulting in uneven coloring, spots.

If you want your products looks exactly same as your designs, so to achieve the perfect finish is essential to your complete satisfaction. Our technicians and craftsmen are equipped to offer a full range of finishing services,Grinding, Polishing, Painting, Silk-screen, Electroplating, Anodizing, Laser etching, Sandblasting, UV Coating, Powder Coating, Brushing, Passivating, Mirror finishing etc.

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