1. Logo inspection

Whether the product standard code and production license number are marked on the aluminum profile and packaging.

2. Surface quality

In addition to being clean, the surface of aluminum profiles is not allowed to have defects such as cracks, peeling, corrosion and air bubbles, and defects such as corrosion spots, electric burns, black spots, and oxide film peeling are not allowed.

3. Oxide film thickness

The oxide film of aluminum profiles is formed in anodic oxidation, which has the function of protection and decoration, and can be detected by eddy current thickness gauge.

4. Sealing quality

After the aluminum profile is anodized, there are many gaps on the surface. If it is not sealed or the seal is not good, the corrosion resistance of the aluminum profile will be reduced. The commonly used methods for sealing quality inspection are acid leaching method, admittance method and phosphotyrosine method.

The acid leaching method is generally used in the on-site inspection, that is, the surface of the aluminum profile is scrubbed with acetone to remove oil and dust, and nitric acid with a volume ratio of 50% is dropped on the surface and scrubbed gently. After 1 minute, the nitric acid is washed away with water, and then wiped Dry, drop a drop of medical violet on the surface, after 1 minute, wipe off the violet and clean the surface thoroughly, carefully observe the traces left, aluminum profiles with poor sealing will leave obvious traces, the heavier the traces, the better the sealing quality worse.