Changshu aluminum surface treatment technology, the purpose of aluminum alloy profile surface treatment is to solve or improve the anti-corrosion, decorative and functional properties of materials.

1. Changshu aluminum surface treatment and characteristics of aluminum alloy

1. Low density

The density of aluminum is about 2.7g/cm3, which is only the second light metal higher than magnesium in metal structural materials, and only 1 / 3 of iron or copper.

2. High plasticity

Aluminum and its alloys have good ductility and can be made into various shapes, plates, foils, tubes and wires by pressure processing means such as extrusion, rolling or drawing.

3. Easy to strengthen

The strength of pure aluminum is not high, but it is easy to strengthen it through alloying and heat treatment. The strength of high-strength aluminum alloy can be comparable to that of alloy steel.

4. Good conductivity

The conductivity and thermal conductivity of aluminum are second only to silver, gold and copper. If the relative conductivity of copper is 100, then aluminum is 64 and iron is only 16. If calculated according to the conductivity of equal quality metals, aluminum is almost twice that of copper.

5. Corrosion resistance

Aluminum and oxygen have very high affinity. Under natural conditions, protective oxides will be formed on the surface of aluminum, which has much better corrosion resistance than steel

6. Easy to recycle

The melting temperature of aluminum is low, 660 ° С The waste is easy to regenerate, the recovery rate is very high, and the recovery energy consumption is only 3% of that of smelting.

7. Changshu aluminum surface treatment can be welded

Aluminum alloy can be welded by inert gas protection method. After welding, it has good mechanical properties, good corrosion resistance and beautiful appearance, which can meet the requirements of structural materials

8. Easy surface treatment

Aluminum can be anodized and colored. After treatment, it has high hardness, wear resistance, corrosion resistance and electrical insulation. Through chemical pretreatment, electroplating, electrophoresis and spraying can be carried out to further improve the decoration and protection of aluminum

2. Changshu aluminum surface treatment - mechanical pretreatment

1. Purpose of mechanical pretreatment

Provide good apparent conditions and improve the quality of surface finishing;

Improve product grade;

Reduce the impact of welding;

Produce decorative effect;

Obtain a clean surface.

2. Common methods of mechanical pretreatment

The commonly used mechanical pretreatment methods include polishing, sandblasting, brushing, rolling and so on. The specific pretreatment shall be determined according to the product type, production method, initial surface state and final finishing level.

3. Principle and function of mechanical polishing

The friction between the high-speed rotating polishing wheel and the workpiece produces high temperature, which is the plastic deformation of the metal surface. Changshu aluminum surface treatment flattens the convex and concave points of the metal surface. At the same time, the extremely thin oxide film on the metal surface generated instantaneously under the oxidation of the surrounding atmosphere is repeatedly ground down, so as to become brighter and brighter. The main function is to remove the surface defects such as burrs, scratches, corrosion spots, sand holes and pores on the workpiece surface. At the same time, further remove the slight unevenness on the surface of the workpiece to make it have higher luster until the mirror effect.

4. Principle and function of sand blasting

Clean compressed air is used to spray dry sand flow or other abrasive particles onto the surface of aluminum products, so as to remove surface defects and present a uniform and matte sand surface. Main functions: remove burrs, casting slag and other defects and dirt on the workpiece surface; Improve the mechanical properties of the alloy; Achieve uniform surface extinction effect.

5. Principle and function of brushing

Brushing is to remove burrs and dirt on the product surface with the help of the rotating brush of the brushing wheel. Aluminum alloy drawing is to conduct wire drawing treatment on products, and the main purpose is to play a decorative role

6. Principle and function of rolling light

Rolling is to put the workpiece into the drum containing abrasive and chemical solution. With the rotation of the drum, the workpiece and abrasive, workpiece and workpiece rub against each other, which has achieved the effect of polishing