The appearance treatment principle of galvanized packaging steel strip

The appearance treatment principle of galvanized packaging steel strip.
　　 In normal working environment, if the thickness of the galvanized layer of hot-dip galvanized steel strip is more than 50μm, it can be used safely for 30 years. This is due to the anodic protection of the iron matrix. The pure zinc layer of hot-dip galvanized strip steel can form a dense and passivating alkaline zinc carbonate [Zn2(OH)2CO3] protection film in the atmosphere. Prevent the corrosion of zinc. However, because zinc is a more active amphoteric element that reacts with acids and alkalis, and can also replace heavy metal ions in salts, the galvanized layer is easily damaged in a humid acid-base or salt environment, causing corrosion. perforation. Therefore, in view of this situation, it is recommended to treat the appearance of the galvanized steel strip, such as Beijing design, bitumen, or seal the groove to isolate the direct contact between the medium and the zinc layer. This will help the galvanized steel strip to perform its functions and ensure safe use within the service life. Occasionally, it is not that our products are not good enough, and that we do not understand maintenance. A good maintenance method can extend the life of galvanized steel strip.