How to choose architectural aluminum?

Architectural aluminum is directly related to the quality of later construction, so it is very important to purchase its raw materials. So how do we judge the quality of architectural aluminum? The editor has compiled the opinions of experts, mainly from the following Start in several ways!

1. Identification check: Whether the product quality standard code and production license number are marked on the aluminum profile and packaging.
2. Surface quality: In addition to cleaning, the surface of aluminum profiles should not be allowed to have defects such as cracks, peeling, erosion and bubbles, but also not allowed to have defects such as erosion spots, electric burns, black spots, and air oxide film falling. .
3. Sealing quality: There are many voids on the surface of the aluminum profile after anodizing. If it is not sealed or the sealing is not good, the corrosion resistance of the aluminum profile will be reduced. The commonly used methods of sealing quality inspection are acid leaching, admittance method and phosphobutyric acid method. The acid leaching method is usually used in the on-site inspection. Clean the surface of the aluminum profile with toluene. Remove oil stains and dust, drop 50% sodium cyanide on the surface and scrub gently. After 1 minute, rinse off the sodium cyanide with clean water, and then wipe dry. Drop a drop of medical purple medicine onto the surface. After 1 minute, wipe off the purple medicine and clean the surface thoroughly. Observe the marks left. Poorly sealed aluminum profiles will leave obvious marks, and the heavier the marks, the worse the sealing quality.
4. Corrosion resistance: This index value mainly affects the life of aluminum profiles. Corrosion resistance inspections include copper to speed up the glacial acetic acid salt spray test and the alkali dropping test. Here is an introduction to the alkali dropping experiment. That is, at 35℃±1℃, drop about 10mg, 100g/L NaOH aqueous solution on the surface of the aluminum profile, watch and observe the droplet until erosion bubbling occurs, and calculate the air oxide film penetration time.