The Concept Of Matte Black Anodizing?

Aluminum anodizing is a process in which the metal is placed in the electrolyte as the anode to form an oxide film of dozens to hundreds of microns on the surface of the metal. The formation of this layer of oxide film makes the metal have the performance of corrosion prevention and wear resistance. The typical and common anodic oxidation of aluminum and alloy is taken as an example to illustrate its principle.

Aluminum and aluminum alloy workpiece after surface oil removal and other pretreatment process, as the anode, other aluminum plate as the cathode, with dilute sulfuric acid (or chromic acid) solution as the electrolyte. After electricity, the anodic reaction is OH-discharge oxygen precipitation, it quickly react with the aluminum on the anode to form oxides, and release a lot of heat, that is, the oxidation film in the process of anodic oxidation, near the electrolyte side of the Al2O3 and Al203·H20 composed of, relatively low hardness. Due to the inhomogeneity of the membrane and the dissolution of the acid electrolyte to the membrane, the porous layer is formed. The electrolyte reaches the aluminum surface through the porous hole, and the oxide film on the aluminum substrate grows continuously.

The oxide film obtained by anodic oxidation is firmly bonded with the metal crystal, thus greatly improving the corrosion resistance of the metal and its alloy, and improving the surface resistance and enhancing the insulation performance. Oxidized aluminum wire can be used as winding coil of motor shaft transformer. In addition, because of the porous aluminum oxide film, adsorption performance is strong, so it can be stained with a variety of bright colors, decoration of aluminum products. For the surface pores that do not need to be stained, it is necessary to be closed to reduce the pores, improve the corrosion resistance of the oxide film, and prevent corrosive media from entering the hole and causing corrosion.

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