How to distinguish good and bad aluminum profiles?

1: Logo inspection: whether it marked the #aluminumprofile and packaging with the product standard code and production license number, etc.

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2: Surface quality: besides 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.

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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 an eddy current thickness gauge.

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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, the Admittance method, and the phosphoric acid method. The on-site inspection generally adopts the acid-leaching method. 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 Wash off the nitric acid with clean water, and then dry it. Drop a drop of medical violet on the surface, after 1 minute, wipe off the violet and clean the surface, and carefully observe the traces left. Aluminum profiles that are not well sealed will leave obvious traces. The heavier the trace, the worse the sealing quality.

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5: Corrosion resistance: This index mainly affects the life of aluminum profiles. Corrosion resistance inspection includes copper accelerated acetic acid salt spray test and alkali drop test. Here is the alkali drop test. That is, at 35 ° C ± 1 ° C, About 10mg, 100g/L NaOH solution is dropped on the surface of the aluminum profile, and the drop is visually observed until corrosion bubbles, and the time for the oxide film to penetrate is calculated. This test is easy to make a rough judgment outdoors in summer. The accuracy of the test needs to be carried out under the strict conditions of the laboratory.

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