Placed aluminum panel in the appropriate electrolyte as anode to electrolyse, under certain condition and current, can made anodized aluminum panel. After anodized, the surface formed alumina layer, it’s thickness is 5-25 micron, if hard anodizing, the thickness of oxide film can reached 60-200 micron.After Anodized, the hardness and abrasion resistance had been greatly improved, can be reached to 250-500Kg/mm2, the melting point of the alumina layer is up to 2320K, excellent insulation, the breakdown voltage up to 2000V, enhanced corrosion resistance, under circumstance of ω =0.03NaCl, it was not corrosion after thousands of hours.The oxide film is microporous, can adsorption lube and suit manufacture of the engine’s cylinder or other abrasion- resistance parts. Non-ferrous metals or their alloys (such as aluminum, magnesium and its alloys) also can be anodized.
Product performance
Anodized aluminum panel, using coil anodizing operation automatically and continuous, great quantities and good quality, has several features:
Easy construction
Anodized aluminum plate had strong decorative and moderate hardness, can do continuous and high-speed stamping, convenience to made products directly, not need any complex surface treatment, greatly reduced the production cycle and costs.
Excellent weather resistance
Anodized aluminum plate with Standard thickness of anodizing coating （5μ m）do not change color, non-corrosive, non-oxidation and rust under long-term indoors use, with thicken anodizing coating （25μ m）even used outdoor and Long-term exposure to the sun light, the color will not changed.
Strong sense of metal
After anodized, the surface of the aluminum plate can as hard as gem, excellent scratch resistance, no paint on the surface, keep the metal color, Highlight the sense of modern metal, enhance the product ‘s quality and value-added.
Excellent fireproof
pure metal, without any paint and chemical substances on the surface, nonflammable under 600℃, do not produce toxic gases, meet the fire safety and environmental protection requirements.
Excellent stain resistance
No fingerprints and stain marks, easy clean, do not cause corrosion spots.
Wide using range
Widely used on indoors and outdoors metal wall panels, ceiling, office buildings, commercial building, airports, subways, light rails, exhibition halls, underground tunnels, hospitals and other places.
Structure and feature of the anodizing coating：
The anodizing coating had two layers, the outer layer is porous and thicken, growing up on the inner layer which is dense and dielectric properties, the latter called barrier layer (also called active layer).Study with electron microscope, vertical and horizontal surfaces of the layer almost all present with tubular holes vertical to the metal surface, they run through the outer layer until to the barrier between the oxide film and metal interface.? The barrier is made of anhydrous alumina, thin ,dense, hardness and can prevent current form going through.The thickness of the barrier is about 0.03-0.05μ m, 0.5%-2.0% of the total film. The pore as the main axis, surrounded by dense alumina to form a hexagonal honeycomb, we called it crystal cell, the layer is composed by numerous of such cells.If the electrolyte is sulfuric acid, the total content of sulfate will be 13%-17% under normal circumstances. The outer layer of the anodizing coating is made of amorphous alumina and small amount of hydrated aluminum, in addition, it also contains electrolyte cation. The excellent feature of the oxide film is mainly decided by the thickness and the porosity of the Porous outer layer, they all closely related with the anodizing conditions.
