ã€China Aluminum Industry Network】1. Mark inspection: Whether aluminum profiles and packaging are marked with product standard codes and production license numbers. 2. Surface quality: In addition to the cleanliness of the aluminum surface, there must be no defects such as cracks, peeling, corrosion, and bubbles, and there are also defects such as corrosion spots, electric burns, dark spots, and oxide film fallout. 3, oxide film thickness: aluminum oxide film is formed in the anodizing, with protection and decorative effects, eddy current thickness gauge can be detected. 4, sealing quality: aluminum anodized surface after leaving many gaps, if not closed or closed well, will reduce the corrosion resistance of aluminum. Seal hole quality inspection commonly used methods are acid leaching, conductivity Nafion and Phosphoric Acid Method. Acid leaching is commonly used for on-site inspections. The surfaces of aluminum profiles are scrubbed with acetone to remove oil and dust. Nitric acid with a volume ratio of 50% is dripped onto the surface and gently scrubbed, after 1 minute. Wash the nitric acid with water, then wipe it dry. Drop a drop of medical purple drug onto the surface. After 1 minute, wipe off the gentian violet and thoroughly clean the surface. Observe the traces left behind. The aluminum profile with bad sealing will leave obvious traces. The more severe the trace, the poorer the sealing quality. 5. Corrosion resistance: This index mainly affects the life span of aluminum profiles. Corrosion resistance tests include copper accelerating acetate spray test and dripping alkali test. Here we introduce the dripping test. That is about 35°C±1°C. 10mg, 100g/L NaOH solution was dropped on the surface of the aluminum profile, and the droplets were visually observed until a corrosive bubbling occurred, and the oxide film was penetrated. This test was easy to judge in the outdoor summer, to ensure the test Accuracy must be performed under the strict conditions of the laboratory.
