As a new decorative material, aluminum veneer was introduced to China from Germany in the late 1980s and early 1990s, and it was quickly favored by consumers in China because of its economic benefits, various colors, convenient construction, excellent fireproof performance of aluminum processing technology and high quality. 

So, what are the differences between aluminum veneer and aluminum plate, and what are the processing requirements of aluminum plate?

Its import aluminum plates include two kind of materials with different properties (metal and nonmetal), which not only retain that main features of the original material (metal aluminum and nonmetal polyethylene plastic), but also overcome the shortcomings of the original materials, thus obtaining many excellent material properties, such as luxury, colorful decoration, weather resistance, corrosion resistance, impact resistance, fire prevention, moisture resistance, sound insulation, heat insulation and corrosion resistance. Lightweight, aluminum plate processing is easy to form, easy to transport and so on Therefore, it is widely used in all kinds of architectural decoration, such as ceilings, pillars, cargo platforms, furniture, telephone booths, elevators, storefronts, billboards, factory wall materials, etc., and has become a representative of metal curtain walls. In developed countries, aluminum-plastic panels have also been used to make sound insulation materials for buses, stoves, airplanes and ships, planning toolboxes, etc.

Aluminum veneer refers to a building decoration material which is processed by using fluorocarbon spraying process after chromizing and other treatments. Fluorocarbon paint refers to polyvinylidene fluoride resin (KANAR500), which is divided into primer, topcoat and varnish. The shotcreting process is generally divided into secondary spraying, tertiary spraying and tertiary spraying. Fluorocarbon coating has excellent corrosion resistance and weather resistance, and can resist acid rain, salt spray and various air pollutants. Imported aluminum plate has good cold and heat resistance, can resist strong ultraviolet radiation, and has long service life, no fading and no pulverization.

Aluminum plate processing requirements: There are perfect cutting, stamping, bending and rounding processing technologies, which can complete the processing of various disordered metal plates within the basic size range of less than 4 meters (many manufacturers can complete the processing of more than 6 meters, but the longer the processing length, the worse the flatness). Argon arc welding and high-frequency nail welding equipment for aluminum materials can ensure the high-quality completion of welding, corner sealing and nail planting for reinforcing ribs of formed aluminum plates. Mechanical grinding and polishing equipment, 6.6× 1.7× 1m active pretreatment tank, and a set of 8× 3m and 8× 2m planned spray room and oven can complete the processing of super-large plates and long materials, and ensure that the products can meet the film requirements of the substrate required for painting.

Processing requirements of shotcrete aluminum plate: chemical pretreatment method is adopted to remove organic and inorganic stains on metal surface. Then, the natural oxide layer is removed, and then an oxide film is formed by chemical agents, so that the metal surface has the effects of rust prevention and constant adhesion. In this invention, the advanced active electrostatic spraying line in China is adopted, and fluorocarbon coating is sprayed on the metal substrate layer by layer according to the process requirements, and baked and cured at a certain temperature.

Effect of anodic oxidation treatment on aluminum and its alloy parts

It is well known that aluminum and its alloys will be oxidized in the air. The oxide film naturally formed on the aluminum surface is amorphous, which will make the aluminum surface lose its original luster. Although this natural oxide film will slightly passivate the aluminum surface, it is very thin, about 4 ~ 5 nm, with large porosity and poor mechanical properties, which cannot effectively prevent the aluminum metal from further corrosion by various media in the atmosphere. After anodic oxidation treatment, a dense film layer (from tens of microns to hundreds of microns) can be obtained on the surface of aluminum and its alloys, which is much thicker than that of natural oxidation. After sealing this artificial oxide film, the amorphous oxide film is transformed into a crystalline oxide film, and the pores are also sealed, so that the luster of the metal surface can remain unchanged for a long time, the corrosion resistance and mechanical strength are improved, and a decorative appearance can be obtained after dyeing. Because aluminum and its alloy products have many characteristics after anodic oxidation, aluminum anodic oxidation process is widely used in surface treatment of aluminum products.

 Industrial applications can be roughly divided into the following categories. (1) Preventing corrosion of products: The film obtained by anodic oxidation has good stability in the atmosphere after proper sealing treatment. No matter the oxide film obtained from sulfuric acid solution, oxalic acid solution or chromic acid solution in the normal process, its corrosion resistance is very good, such as daily aluminum pots, pots, washing machine liners and so on. Chromic acid oxidation method is especially suitable for aluminum welded parts and riveted parts. (2) protection and decoration: on the oxide film with high transparency, the oxide film can absorb various organic dyes or inorganic pigments, and various bright colors and patterns can be obtained on the oxide film. In addition, in recent years, many new technologies, such as one-time oxidation and multiple coloring, fireworks pattern, wood grain pattern, oxidation offset printing, porcelain oxidation, etc., have made the appearance of aluminum more beautiful and pleasing to the eye. 

This color film is both a decorative layer and an anti-corrosion layer, such as a lighter. (3) As a hard wear-resistant layer, a thick and hard film can be obtained by adjusting the process conditions of anodic oxidation in sulfuric acid or oxalic acid solution. The pores and absorption properties of the film are used to store the selected oil, which is effectively applied to the working conditions under friction, and has the characteristics of lubrication and wear resistance, such as engine cylinders and pistons of automobiles and tractors. (4) As electrical insulation layer: The oxide film of aluminum and its alloy has the characteristics of high resistance, and the thickness of the film is proportional to the resistance, which has certain practical significance as electrical insulation. It can be used as the dielectric of capacitors, and it can also be used as the outer sheath of cables. It is more popular abroad to use aluminum oxide skin as insulation layer to replace rubber sheath and plastic sheath. When the film thickness is 27.5 μ m, its breakdown voltage is 441V V.

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