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Anodized And Powder Coated Aluminium Extrusions Quality Directly Affects Usage Performance
Oct 10, 2017

⑴, corrosion resistance. Aluminum Anode oxide film can effectively protect the aluminum matrix from corrosion, anodic oxide film is obviously better than the natural formation of the oxidation film performance, film thickness and sealing quality directly affect the performance of the use.

⑵, hardness and wear resistance. The hardness of aluminum anodic oxide film is much higher than that of aluminum, the hardness of the matrix is HV100, the hardness of common anodic oxide film is about HV300, and the hard oxide film can reach HV500. The relationship between abrasion resistance and hardness is consistent.

⑶, adornment sex. Anodized aluminum film can protect the polished surface of the metal luster, anodized film can also be dyed and stained, to obtain and maintain a colorful appearance.

Adhesion of ⑷, organic coating and electroplating layer. Aluminum anodizing Film is a method for aluminum surface to accept organic coating and electroplating layer, which effectively enhances the adhesion and corrosion resistance of the surface layer.

⑸, electrical insulation. Aluminum is a good conductor, aluminum anodic oxide film is a high resistance of the insulating film. Insulation breakdown voltage is greater than 30v∕um, specially prepared high insulating film even reaches approximately 200v∕um. ⑹, transparency. Anodized and Powder Coated Aluminium Extrusions film itself is very transparent, the higher the purity of aluminum, the higher the transparency. The purity and alloy composition of aluminum alloy materials have an effect on transparency.

⑺, functional. A variety of functional materials can be obtained by using the porous properties of Anodized and Powder Coated Aluminium Extrusions membranes to deposit functional particles in microporous pores. The functional components in development are electromagnetic function, catalysis function, sensing function and separating function.

Principle and porous property of Anodized and Powder Coated Aluminium Extrusions

In the electrolyte solution, through the addition of anodic current, the surface of metal material will be formed to protect the oxide film, this kind of surface treatment is called Anodized and Powder Coated Aluminium Extrusions. The most metal materials for Anodized and Powder Coated Aluminium Extrusions treatment are aluminum.

Anodized and Powder Coated Aluminium Extrusions of aluminum is generally carried out in acidic electrolyte, with aluminum as anode. In the electrolysis process, the anion of oxygen and aluminum Act to produce oxide film. The initial formation of this film is not fine, although there is a certain resistance, but the negative oxygen ions in the electrolyte can still reach the aluminum surface to continue to form an oxide film. As the thickness of the film increases, the resistance becomes larger, the electrolytic current will become smaller, then the outer oxide film contacting with the electrolyte will dissolve chemically. When the velocity of the oxide on the surface of the aluminum is gradually balanced with the rate of chemical dissolution, the oxide film can reach the maximum thickness under this electrolytic parameter.

The oxidation film can further improve its corrosion resistance and wear resistance after the sealing treatment of hot water, high temperature steam or nickel salt. In addition to aluminum, the production of metal materials using Anodized and Powder Coated Aluminium Extrusions treatment of magnesium alloys, copper and copper alloy, zinc and zinc alloy, steel, cadmium, tantalum, zirconium and so on.

We all know that the anodic oxide film of aluminum alloy has porous property. The oxide film is gradually formed in the contradiction between growth and dissolution. When the power of the moment, oxygen and aluminum there is a strong insulation resistance, is the expansion of the volume of alumina after the larger than the aluminum ions, the barrier layer becomes uneven, resulting in uneven distribution of current, concave at a small resistance, large current, convex in the opposite. The concave with high current density has the electrochemical dissolution of the oxide film under the action of electric field, and the chemical dissolution after sulfuric acid leaching, which makes the concave place deepen gradually into cavities, and then the porous oxide film is formed. The Anodic oxide film is porous, it is easy to adsorb dyes and coloured material, so it can be dyed to improve its decorative property.