anodize perforated aluminum sheet refers for the procedure of creating aluminum oxide film on the surface of an aluminum sheet through electrolysis when the aluminum sheet is place within the electrolyte because the anode. In the anodization device, a material with higher chemical stability within the electrolyte, which include lead, stainless steel, aluminum, etc., serves as the cathode. The fundamental principle of aluminum anodization will be the electrolysis of water. When the current circulates, hydrogen is released in the cathode, while on the anode are not only oxygen molecules, but additionally oxygen atoms (O) and oxygen ions deposited (these are usually expressed as oxygen molecules within the reaction). The aluminum on the anode is then oxidized by the oxygen deposited on it, forming a water-free aluminum oxide film; meanwhile, not all of the oxygen generated reacts together with the aluminum, and some is released as gas.
2. Collection of electrolyte for anodize perforated aluminum sheet
The prerequisite of forming the oxide film around the anode is that the oxide film is soluble in the electrolyte. However, this will not imply that all anodization in an electrolyte with solubility might create oxide films or oxide films with similar properties.
3 Varieties of anodization of aluminum sheet
In accordance with the kind of current, anodization is often classified into DC anodization, AC anodization and pulse existing anodization; in accordance with the kinds of electrolyte, it may be classified into sulfuric acid anodization, oxalic acid anodization, chromic acid anodization, mixed acid anodization and sulfo organic acid-based natural coloring anodization ; as outlined by the properties in the films, it may also be classified into anodization for frequent film, anodization for hard film (thick film), anodization for porcellaneous film, anodization for glossy finish and anodization for semi-conductive barrier layer. Among those, the AC sulfuric acid anodization will be the most usually utilized.
four. Structure and properties from the oxide film formed throughout anodize perforated aluminum sheet
The oxide film obtained via anodization consists of two layers. The external layer is thick and porous, which grows around the dense internal layer with dielectric home; the internal layer is known as the barrier layer (also known as active layer). When the film is observed under an electronic microscope, each its transverse and longitudinal surfaces appear to have vasiform pores perpendicular to the metal surface; the pores go through the external layer to the barrier layer between the oxide film and also the metal surface. Taking a pore as the axle, a honeycomb-shaped six-edge prism is formed by the dense anodize perforated aluminum sheet about, that is known as a unit cell. The complete film consists of quite a few unit cells. The barrier layer is formed by water-free aluminum oxide that may be thin, dense and difficult with resistance to passage of present;
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