The galvanized steel refers to a surface treatment technique that coats a layer of zinc
on the surface of a metal, alloy or other material for aesthetics,
rust prevention, and the like. The main method used is hot-dip
galvanizing. Zinc is easily soluble in acid and soluble in alkali,
so it is called an amphoteric metal. Zinc hardly changes in dry
air. In moist air, a dense zinc carbonate film is formed on the
zinc surface. In the atmosphere containing sulfur dioxide, hydrogen
sulfide and marine, the corrosion resistance of zinc is poor,
especially in the atmosphere containing high temperature and high
humidity containing organic acid, the zinc coating is easily
corroded. The standard electrode potential of zinc is -0.76V. For
steel substrates, zinc coating is an anodic coating. It is mainly
used to prevent corrosion of steel. Its protective performance has
a great relationship with the thickness of the coating. After
passivation, dyeing or coating of the photoresist, the zinc coating
can significantly improve its protection and decorative properties.