What are Aluminum Extrusions?

Titanium plating on aluminum profiles belongs to the coating technology. It adds pre-plating and electroplating process steps to the conventional titanium plating process. The aluminum profile process involves chemically treating activated plated parts in an aqueous solution of common salt and hydrochloric acid.

Aluminum profile

Corrosion resistance

The density of aluminum profile is only 2.7g / cm3, which is about 1/3 of the density of steel, copper or brass (respectively 7.83g / cm3, 8.93g / cm3). Under most environmental conditions, including in air, water (or brine), petrochemicals, and many chemical systems, aluminum can show excellent corrosion resistance.

Conductivity

Aluminum profiles are often chosen for their excellent electrical conductivity. On an equal weight basis, the electrical conductivity of aluminum is nearly twice that of copper.

Thermal conductivity

The thermal conductivity of aluminum alloy is about 50-60% of copper, which is beneficial for manufacturing heat exchangers, evaporators, heating appliances, cooking utensils, and automobile cylinder heads and radiators.

Non-ferromagnetic

Aluminum profiles are non-ferromagnetic, which is an important feature for the electrical and electronics industries. Aluminum profiles are not self-igniting, which is important for applications involving handling or contact with flammable and explosive materials.

Machinability

The workability of the aluminum profile is excellent. In various deformed aluminum alloys and cast aluminum alloys, and in the various states that these alloys have after production, the machining characteristics vary considerably, which requires special machine tools or techniques.

Formability

Specific tensile strength, yield strength, ductility, and corresponding work hardening rate govern changes in the amount of deformation allowed.

Recyclability

Aluminum has extremely high recyclability, and the characteristics of recycled aluminum are almost the same as those of primary aluminum.

The level and variety of aluminum alloy building profiles produced in China are comparable to those in other countries. The product types can be divided into: anodized colored profiles, electrophoretic painted profiles, powder sprayed profiles, fluorocarbon paint sprayed profiles, and thermal insulation profiles.

Aluminum alloy building profiles have the advantages of high strength, light weight, corrosion resistance, good decoration, long service life, and rich colors. Generally, the surface of a good product does not lose light or change color within 20 years.

Matters needing attention for aluminum profiles

Pay attention to the following points when choosing and using aluminum alloy building profile products:

1. Check the product delivery certificate, pay attention to the date of delivery, specifications, technical conditions, company name and production license number.

2. Carefully check the surface condition of the product. The product should have bright colors and good gloss, and the surface must not have obvious scratches, bubbles, and other defects.

3. Pay attention to the wall thickness of the product. The thickness of the door and window materials should not be less than 1.0mm.

4. Pay attention to the thickness of the product surface coating. The thickness of the anodized product is not less than 10 m. The thickness of the electrophoretic paint product is not less than 17 m. The thickness of the powder-coated coating does not exceed 40-120 m. The product should be above the second coat and not lower than 30m.

5. Users in coastal areas are best to choose electrophoretic paint profiles, powder spray profiles or fluorocarbon spray profiles with good corrosion resistance.

6. Do not use other hard objects such as brushes as cleaning tools during routine maintenance. You should choose soft cotton yarn and cotton cloth.

7. Water, soap and soap can be used for cleaning, but other organic substances cannot be used.

Inferior characteristics of aluminum profiles

Squeeze defects. During the extrusion process of aluminum profiles, due to the completeness of the extrusion equipment, the maturity of the extrusion process, and the improper operation, defects such as bubbles, inclusions, layering, color difference, and distortion will be produced, affecting the quality of aluminum profiles.

The oxide film is thin. National standards stipulate that the thickness of the oxide film on aluminum profiles for buildings should not be less than 10um (micrometers). The thickness is not enough, the surface of aluminum profile is easy to rust and corrode. In the spot inspection, the thickness of the oxide film of some aluminum profiles without the name, site, production license, and certificate of conformity is only 2 to 4um, and some even have no oxide film. According to expert estimates, for each 1um reduction in oxide film thickness, each ton of profile can reduce power consumption costs by more than 150 yuan.

Chemical composition failed. Aluminum profiles with a large amount of mixed aluminum and waste aluminum can greatly reduce costs, but will cause the chemical composition of building aluminum profiles to be unqualified and seriously endanger the safety of construction projects.

Reduce profile wall thickness. 90 series sliding window type, according to national standards, the minimum aluminum wall thickness is not less than 1.4mm, and some products are only 0.6 to 0.7mm. The 46 series ground gate type, the minimum thickness of the aluminum profile used in national standards is not less than 1.62mm, and during sampling, some products are only 0.97 to 1.18mm.

Inferior aluminum profiles greatly reduce the closing time , reduce the consumption of chemical reagents, and reduce costs, but the corrosion resistance of the profiles is also greatly reduced.