How to avoid buying low-quality aluminum alloy profiles

by:Zeyi     2021-09-09
The chemical composition ratio of aluminum alloy depends on the production process of aluminum profile. Different composition ratios depend on how consumers use them later, but many consumers do not know the process of aluminum alloy, which leads to wrong purchase and use. So how do we avoid buying low-quality aluminum profiles?   low-quality aluminum alloy profiles have the following characteristics:    extrusion defects. In the process of aluminum extrusion, due to the completeness of the extrusion equipment, the maturity of the extrusion process and the improper operation, defects such as bubbles, inclusions, layering, chromatic aberration and distortion will occur, which will affect the quality of the aluminum profile.  The thickness of the oxide film is thin. National standards stipulate that the oxide film thickness of architectural aluminum profiles should not be less than 10um (micrometers). If the thickness is not enough, the surface of aluminum profile is easy to rust and corrode. In the random inspection, some aluminum profiles without the factory name, site, production license and qualification certificate have an oxide film thickness of only 2 to 4um, and some even have no oxide film. According to experts' estimates, for every reduction of 1um oxide film thickness, each ton of profile can reduce the cost of electricity consumption by more than 150 yuan.  The chemical composition is unqualified. The aluminum profile mixed with a large amount of miscellaneous aluminum and scrap aluminum can greatly reduce the cost, but it will cause the chemical composition of the building aluminum profile to be unqualified, and seriously endanger the safety of the construction project. Reduce the wall thickness of the profile. For the 90 series sliding window type, the minimum wall thickness of aluminum profiles is not less than 1.4mm according to national standards, and some products are only 0.6 to 0.7mm. For 46 series of floor bomb doors, the minimum wall thickness of the aluminum profile used in the national standard is not less than 1.62mm. During the random inspection, some products are only 0.97 to 1.18mm.   In summary, inferior aluminum alloy profiles greatly reduce the sealing time, reduce the loss of chemical reagents, and reduce costs, but the corrosion resistance of the profiles is also greatly reduced. There are many hidden dangers in later use. Everyone should choose a regular aluminum profile manufacturer during the purchase process.
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