How can aluminum black oxidation be black and bright

Can do aluminum black anodizing treatment.

Anodic oxidation of aluminum is a process in which the metal is placed in the electrolyte as an anode and the oxide film of tens to hundreds of microns is formed on the metal surface. The formation of this oxide film makes the metal have corrosion resistance and wear resistance. The principle of anodic oxidation of aluminum and alloy is illustrated by example.

Aluminum and aluminum alloy workpiece after surface degreasing pretreatment process, as the anode, other aluminum plate as the cathode, dilute sulfuric acid (or chromic acid) solution as electrolyte. After electrification, the anodic reaction is oH-discharge oxygen precipitation, which quickly reacts with the aluminum on the anode to generate oxide and release a lot of heat, that is, the oxide film in the anodic oxidation process, which is composed of Al2O3 and Al203·H20 on the side near the electrolyte, with low hardness. Loose pores, or porous layers, are formed as a result of the uneven membrane and the dissolution of the membrane by the acidic electrolyte. The electrolyte reaches the surface of aluminum through the loose hole, so that the oxide film on the aluminum matrix grows continuously.

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