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Grasp the quality of aluminum profile, from the five aspects of inspection

Update time : 2023-02-09 19:50:43

1. Identification check: whether the aluminum profile and packaging are marked with commodity scale code and production license number.

2. Appearance quality: in addition to the appearance of aluminum should be clean, do not promise cracks, peels, corrosion and bubbles and other errors, but also do not promise to have corrosion spots, electric burns, black spots, oxide film off and other errors.

3. Oxide film thickness: the oxide film of aluminum profiles is formed in anodic oxidation, and the aluminum row has a protective and decorative effect, which can be checked by eddy current thickness measuring instrument.

4. Sealing quality: there are a lot of vacancies on the surface of aluminum profiles after anodic oxidation. If it is not blocked or blocked, it will reduce the corrosion resistance of aluminum profiles. The commonly used methods for sealing quality inspection include acid leaching, admittance and phosphobutyric acid. The acid leaching method is always used in the field inspection. The surface of the aluminum profile is wiped clean with acetone to remove oil and dust, and the volume ratio of 50% nitric acid drops to the surface and gently wipe, after 1 minute, wash off the nitric acid with clean water, and then dry. Put a drop of medical purple potion on the surface, after 1 minute, wipe off the purple potion and thoroughly wash the surface, carefully examine the marks left. The aluminum profile with bad sealing will leave a bright trace.

5. Corrosion resistance: this policy mainly affects the life of aluminum profiles. Corrosion resistance was checked with a copper-accelerated acetate spray trial and a drop alkali trial. Here are the alkali drop attempts. That is, at 35 ° C ±1 ° C, the approximate 10mg, 100g/LNaOH solution drops to the surface of the aluminum profile, and the purpose is to observe the droplet until the corrosion bubbles, and the 7075 aluminum strip market spot calculation of its oxide film penetration time. This attempt is easy to be judged in the summer outdoor rough step, in order to ensure the accuracy of the attempt must be carried out under the strict conditions of the experiment room.

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