Precautions for Hard Anodic Oxidation Staining of Aluminium Profiles

The main purpose of Hard Anodized Aluminium Coating is to improve the properties of aluminum and aluminum alloys. Including corrosion resistance, wear resistance, weather fastness, insulation, and adsorption. It is suitable for extruding aluminum alloy and casting aluminum alloy parts.

This article introduces the series:

• Characteristics of Hard Anodic Oxidation Coating
• Working Principle of Hard Anodic Oxidation
• Difference Between Hard Anodic Oxidation and White Anodizing
• Several Classifications for Hard Anodic Oxidation Treatment of Aluminium Profiles
• Precautions for Hard Anodic Oxidation Staining of Aluminium Profiles

Besides antirust function, Hard Anodized Aluminium also has an excellent exterior dyeing technology. However, the following considerations should be noted:

After Hard Anodized Aluminium, sulfuric acid solution remains in the film hole of the oxide film. Therefore, the aluminum products must be completely clean and clean before dyeing.In order to prevent impurities in the dyeing tank, especially phosphate ions and fluorine ions, it is necessary to establish pure water cleaning before the dyeing tank and monitor the water quality.

In dyeing conjecture, most of them are organic dyes, organic dyes are simple moldy.In order to effectively prevent the tank liquid from mildew, the tank can be sterilized with bleaching powder, phenol and other drugs before producing the tank liquid.In the process of producing the bath solution, adding the anti-mildew agent can effectively extend the service time of the dye solution.After the solution is prepared, it will be stored for several hours before it can be put into use. In order to ensure stable PH value, it can participate in acetic acid.

Usually require PH is 5 ~ 6, secure the PH is very important for dyeing, especially so to mixed dyes, different PH value, there may be different colors, to strengthen the stability of PH value, bath in manufacturing in buffer solution is a feasible method, to strengthen water before dyeing, together with acid.

Aluminum products to remove floating color, attached to the aluminum appearance at the moment to pay more attention to water tank of water quality, for the combination of dye molecules and oxide film is reversible, when there is more water impurity ions, promotes the dye molecules and oxidation membrane separation in the water, showing at the moment faded, the fade is often uneven, cause with a material on color difference after all.

Sealing hole processing is part of the anodic oxidation no shortage, after oxidation dyeing, only hole sealing processing ability to ensure that the original color, dyeing membrane can have a variety of hole sealing technology, steam hole sealing, hot water hole sealing, medium temperature sealing holes are good selection, part of the dye can also choose cold hole sealing technology.After sealing the hole may be because of fading and color slightly lighter than before sealing the hole, but only a little attention should be paid.