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Anodic aluminum plate is the aluminum plate in the corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.) as the anode, under the specific conditions and the role of external current, stop electrolysis
The aluminum plate of the anode is oxidized to form a thin layer of aluminum oxide on the outside, and its thickness is 5 to 20 microns, and the hard anodic oxide film can reach 60 to 200 microns. Anodized aluminum plate, improve its hardness and wear resistance, up to 250 - 500 kg / mm2, good heat resistance, hard anodic oxide melting point of up to 2320K, excellent insulation, breakdown voltage Up to 2000V, to enhance the corrosion resistance, in the Om = 0.03NaCl salt spray by thousands of hours without corrosion. Thin film oxide layer with a large number of pores, can absorb a variety of smoothing agent, suitable for manufacturing engine cylinder or other wear parts; membrane microporous adsorption can be strong to color into a variety of beautiful and beautiful colors. Non-ferrous metals or their alloys (such as aluminum, magnesium and its alloys) can stop anodizing.
Introduction to Chemical Alumina Board
Chemical aluminum oxide plate is weakly alkaline or weak acid solution, the local matrix metal attack, the appearance of the natural oxide film thickening or produce some other passive film processing process, the commonly used chemical oxide film with chromic acid film And phosphoric acid films, which are both thin absorbent and good, can stop the coloring and sealing disposal.
Chemical oxidation of aluminum and aluminum plate anodized film compared
Compared with the aluminum anodic oxide film, the chemical oxidation film of aluminum plate is much thinner, the corrosion resistance and hardness are lower, and the coloring of the aluminum plate is not easy to be colored, so the color and color of the aluminum plate only refer to the anodizing treatment.
Anodizing Process of Aluminum Plate
1, anodized aluminum oxide film to generate the general principle:
The aluminum plate as the anode placed in the electrolyte solution, the application of electrolysis, so that the appearance of the process of forming aluminum oxide film, known as the anodic oxidation of aluminum. The cathode in the installation of electrolytic solution in the high chemical stability of information, such as lead, stainless steel, aluminum and so on. The principle of aluminum anodizing is essentially the principle of water electrolysis. When the current passes, the cathode, the release of hydrogen; in the anode, the precipitation of oxygen is not just molecular oxygen, also includes atomic oxygen (O) and ionic oxygen, usually in the reaction of molecular oxygen. The aluminum, which is the anode, is oxidized by the oxygen precipitated therefrom to form an anhydrous aluminum oxide film. Not all of the generated oxygen reacts with aluminum, and a part is precipitated in a gaseous state.
2, anodized aluminum oxide electrolytic solution of choice:
A prerequisite for the growth of the anodic oxide film is that the electrolyte should have a dissolution effect on the oxide film. However, this does not mean that anodic oxidation can produce an oxide film or produce an oxide film of the same nature in all electrolytes in which dissolution is present.
3, anodized aluminum oxide varieties:
Anodic oxidation by current mode is divided into: DC anodizing, AC anodic oxidation, pulse current anodic oxidation. According to the electrolyte is divided into: sulfuric acid, oxalic acid, chromic acid, mixed acid and sulfonic acid as the main solution of natural coloring anodizing. According to film sub-sub-are: ordinary film, hard film (thick film), porcelain film, bright modification layer, the role of the semiconductor layer of anodic oxidation. Aluminum and aluminum alloys commonly used in anodizing methods and process conditions in Table -5. Among them, the application of DC anodic oxidation method is the most common.
4, anodized aluminum oxide film structure, nature:
The anodic oxide film consists of two layers. The thick, porous outer layer is grown on a dense inner layer with dielectric properties, the latter being called a barrier layer (also called an active layer). With the electron microscope, the longitudinal and transverse surfaces of the film are all tubular pores perpendicular to the metal surface. They penetrate the outer layer of the film until the barrier layer between the oxide film and the metal interface. To the pores around the spindle is dense alumina to form a honeycomb hexagonal body, known as the unit cell, the entire film is numerous and such unit cell composition. The barrier layer is composed of anhydrous aluminum oxide, which is thin and dense and has a high hardness and a function of preventing the passing of current. The thickness of the blocking layer is about 0.03-0.05μm, which is 0.5% -2.0% of the total film. The porous outer layer of the oxide film is mainly composed of amorphous alumina and a small amount of hydrated alumina, and further contains cations of the electrolytic solution. When the electrolyte is sulfuric acid, the sulfate content of the film in the normal state of 13% -17%. Most of the excellent properties of the oxide film are determined by the thickness and porosity of the porous outer layer, all of which are closely related to the anodic oxidation conditions.
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Anodized aluminum plate application
Anodized aluminum plate is widely used in machinery parts, aircraft auto parts, fine instruments and radio equipment, architectural decoration, machine shell, lighting, consumer electronics, handicrafts, household appliances, interior decoration, signs, furniture, car decoration and other industries.
Advantages of anodized aluminum plate
(1) good processability: Yang grade aluminum plate decorative strong, moderate hardness, can easily bend forming, stop the continuity of high-speed stamping, lunch directly processed into products, no longer need to stop the appearance of complex disposal, greatly shorten the product consumption cycle And reduce product consumption costs.
(2) good weathering: the standard thickness of the oxide film (3μm) anodized aluminum plate indoor use long-term does not change color, no corrosion, no oxidation, no rust. Thick anodized aluminum oxide plate (10μm) can be used in outdoor, long-term exposure to sunlight does not change color.
(3) strong sense of metal: the anodized aluminum surface hardness, up to gem grade, good scratch resistance, the appearance of no paint cover, save the aluminum metal color, suddenly modern metal, improve product level and added value.
(4) high fire: pure metal products, the appearance of no paint and any chemical substances, 600-degree heat does not extinguish, does not produce toxic gases, fit fire environmental protection requirements.
(5) strong stain resistance: no fingerprints, there will be no stain trace, easy to clean, do not produce corrosion spots.
(6) Applicability: Widely used for metal aluminum ceiling, curtain wall panels, aluminum-plastic panels, fire board, aluminum honeycomb, aluminum veneer, electrical panels, cabinet panels, furniture panels.
The basic process of appearance disposal is as follows
Anodized aluminum plate process: a shelves degreasing - washing - alkaline corrosion and a wash in a water wash an anodizing a wash a hole in a water wash a shelf a test package.
In the process of degreasing, alkaline etching, and, anodic oxidation, sealing and other processes to ensure the quality of the key oxidation treatment.
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