- Aug 22, 2017 -
Galvanized refers to the surface of metal, alloy or other materials coated with a layer of zinc to the appearance, rust and other effects of surface treatment technology. The main method used is hot galvanizing.
Zinc soluble in acid, can also be soluble in alkali, it is called amphoteric metal. Zinc in the dry air almost no change. In the damp air, zinc surface will produce dense alkaline zinc carbonate film. In the presence of sulfur dioxide, hydrogen sulfide and marine atmosphere, zinc corrosion resistance is poor, especially in high temperature and humidity containing organic acid atmosphere, the zinc coating can easily be corroded. The standard electrode potential of zinc is -0.76V. For the steel matrix, the zinc coating belongs to the anode coating, which is mainly used to prevent the corrosion of steel. The protective performance is related to the thickness of the coating. Zinc coating by passivation treatment, dyeing or coating protective agent, can significantly improve its protective and decorative.