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Identification method of aluminum alloy building profiles

Aluminum alloy building profiles are a kind of aluminum alloy hot extrusion profiles used for processing aluminum alloy doors, windows, glass curtain walls and for decoration. They are light, beautiful and durable, and are widely used in various types of construction and decoration industries.

Here we mainly introduce several simple identification methods for anodized coloring profiles:

1. Label inspection: whether the aluminum profile and packaging are marked with the product standard code and production license number, etc.

2. Surface quality: In addition to being clean, the surface of the aluminum profile should not have defects such as cracks, peeling, corrosion and bubbles, and should not have defects such as corrosion spots, electric burns, black spots, and oxide film shedding.

3. Oxide film thickness: The oxide film of the aluminum profile is formed during anodization, which has protective and decorative effects and can be detected by an eddy current thickness gauge.

4. Sealing quality: There are many gaps on the surface of the aluminum profile after anodization. If it is not sealed or sealed poorly, the corrosion resistance of the aluminum profile will be reduced. Common methods for sealing quality inspection include acid leaching, admittance method and phosphatase method. Acid leaching is generally used in on-site inspections. That is, clean the surface of the aluminum profile with acetone to remove oil and dust, drop 50% nitric acid by volume onto the surface and gently scrub it, wash off the nitric acid with clean water after 1 minute, and then wipe it dry. Drop a drop of medical gentian violet onto the surface, wipe off the gentian violet after 1 minute and thoroughly clean the surface, and carefully observe the traces left. Aluminum profiles with poor sealing will leave obvious traces, and the heavier the traces, the worse the sealing quality.

5. Corrosion resistance: This indicator mainly affects the life of aluminum profiles. Corrosion resistance inspections include copper accelerated acetate spray test and alkali drop test. Here we introduce the alkali drop test. That is, at 35℃±1℃, drop about 10mg, 100g/L NaOH solution onto the surface of the aluminum profile, visually observe the drop until corrosion bubbles appear, and calculate the time it takes for the oxide film to be penetrated. This test is easy to make a rough judgment outdoors in summer, but to ensure the accuracy of the test, it must be carried out under strict laboratory conditions.