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Anodic oxidation of sulfuric acid by direct current
Jan 25, 2018

As the aluminum anode, a short time in the initial anode, the surface is very thin and uniform oxidation, generating very dense films, due to the sulfuric acid solution, the weakness of the membrane (such as grain boundary impurities, dense, lattice defects or structural deformation occurred at the) bureau of the Ministry of dissolution, the emergence of a large number of pores that is, native oxide center, the base metal in contact with the electrolyte into the pore, current is thus able to continue the new generation of oxygen ion conduction, metal oxide is used to the new, and to the bottom of the hole as the center, finally converged to form a layer of film between the old and new metal film, making the old local film dissolved as "repair" get like.

With the prolongation of the oxidation time, the membranes are continuously dissolved or repaired, and the oxidation reaction develops further, so that the oxide film formed on the surface of the product is thin and dense inner layer and thick and porous outer layer.

The thickness of the inner layer (barrier layer, dielectric layer and active layer) basically remains unchanged until the end of oxidation, but the position goes deeper and deeper.




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