Analyze how to distinguish whether aluminum alloy profiles are qualified or not.

Aluminum alloy profile is the most widely used non-ferrous metal structural material in industry, which is used in machinery manufacturing, transportation machinery, power machinery and aviation industry.

Aluminum alloy profiles can be divided into raw aluminum and cooked aluminum. Raw aluminum is less than 98% aluminum, which is brittle and hard, and can only be cast by turning sand. Cooked aluminum is more than 98% aluminum, which is soft and can be rolled or punched into many kinds of utensils. Today, let's talk about the characteristics of inferior aluminum alloy profiles:

1. Unqualified chemical composition. The cost of aluminum alloy profiles doped with a large amount of mixed aluminum and waste aluminum will be greatly reduced, but it will lead to unqualified chemical composition of aluminum alloy profiles for buildings and seriously endanger the safety of construction projects.

2. Inferior aluminum alloy profiles will greatly reduce the sealing time, reduce the loss of chemical reagents and reduce the cost, but the corrosion resistance of profiles is also greatly reduced.

3. The thickness of oxide film is thin. According to the national standard, the thickness of oxide film of aluminum alloy profiles for buildings should not be less than 10um. If the thickness is not enough, the surface of aluminum alloy profiles will be easily rusted and corroded.

According to experts' estimation, if the thickness of oxide film is reduced by 1um, the power consumption cost per ton of aluminum profile can be reduced by at least 150 yuan. Unqualified aluminum profile will be deformed due to the influence of air, rain and sunshine when it is used, and even the glass will break and fall off.

What are the key indicators of aluminum alloy profiles?

1. Appearance quality

Anodized profile surface is not allowed to have electric burns, oxide film falling off and other defects that affect the use; After electrophoresis, powder and fluorocarbon profiles are painted, the paint film shall be uniform, neat and smooth, and there shall be no defects such as wrinkles, cracks, bubbles, flow marks, inclusions and paint film falling off, but there shall be no film locally within 80mm of the profile end.

The appearance quality of aluminum alloy building profile affects the architectural decoration effect, so the surface of the profile must be covered with film to avoid surface scratches, bumps and corrosion during transportation and stacking. Some aluminum alloy building profiles in the market have similar water ripples and moldy spots, which reflects the defects in the production process.

2. Wall thickness

The wall thickness of profile is one of the main factors affecting the strength of workpiece, and the main profile is the stress part in engineering. For example, the minimum nominal wall thickness of the main profile of the outer window shall not be less than 1.4 mm.

3. Film thickness

The surface corrosion resistance of extruded aluminum alloy profiles is not strong, so surface treatment is needed to increase the corrosion resistance, wear resistance and appearance aesthetics of aluminum materials. The film thickness of anodized aluminum is classified into AA10, AA15, AA20 and AA25, and the film thickness of electrophoretic painted aluminum is classified into A．B．S The minimum local thickness of the coating on the decorative surface of powder sprayed aluminum is ≥40um, and the coating thickness on the decorative surface of fluorocarbon painted aluminum has different requirements due to different coating types. The average film thickness of the second coating is ≥30um, the average film thickness of the third coating is ≥40um and the average film thickness of the fourth coating is ≥ 60um.

4. Chemical composition and mechanical properties

The chemical composition, mechanical properties and technical parameters of aluminum alloy profiles are different in different brands and supply States, and customers should check them one by one according to the standards (contracts).

5. Color and chromatic aberration

There are differences in color and color difference between alloys with different brands and supply States. It is suggested that the influence of color and color difference inconsistency on building structure should be fully considered when choosing alloy brand and supply state.

6. Salt spray corrosion resistance, abrasion resistance, weather resistance, mortar resistance, etc.

This is an important technical parameter of aluminum alloy profile, which reflects the performance of aluminum alloy profile and affects its use.

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