Aluminum alloy building profiles (hereinafter referred to as aluminum profiles) are aluminum alloy hot extrusion profiles used to process aluminum alloy doors, windows, glass curtain walls, and for decoration. They are lightweight, beautiful, and durable. They are widely used in various applications. Construction and decoration industry.
Here are some easy identification methods for anodized coloring profiles:
1. Mark inspection: Whether the aluminum profiles and packaging are marked with product standard code and production license number.
2, the surface quality: In addition to the aluminum surface should be clean, does not allow cracks, peeling, corrosion and bubbles and other defects exist, but also does not allow corrosion spots, electrical burns, dark spots, oxide film and other defects.
3, oxide film thickness: aluminum oxide film is formed in the anodizing, with protective and decorative effects, eddy current thickness gauge can be used for testing.
4. Sealed hole quality: After anodized, the aluminum profile has many voids on the surface. If it is not closed or closed, it will reduce the corrosion resistance of the aluminum profile. Sealing quality inspection commonly used methods are acid leaching, admittance and phosphorus acid method. Acid leaching is generally used for on-site inspections. That is, the surface of the aluminum profile was scrubbed with acetone, and the oil and dust were removed. Nitric acid having a volume ratio of 50% was dripped onto the surface and gently scrubbed. After 1 minute, the nitric acid was washed off with water and then wiped dry. Drop a drop of medical purple medicine on the surface. After 1 minute, wipe off the purple lotion and thoroughly clean the surface. Observe the traces left. The aluminum profiles with bad sealing will leave obvious traces. The heavier the traces, the poorer the sealing quality.
5. Corrosion resistance: This indicator mainly affects the life of aluminum profiles. Corrosion resistance tests include copper accelerated acetate spray tests and dripping tests. The dripping
test is described here. That is, about 10 mg of 100 g/L NaOH solution was dropped onto the surface of the aluminum profile at 35° C.±1° C., and the droplets were visually observed until a corrosive bubbling occurred, and the time to penetrate the oxide film was calculated. This test is easy to make rough decisions in the summer outdoors, in order to ensure the accuracy of the test must be carried out under the strict conditions of the laboratory requirements.
