Iron drum manufacturers believe that galvanizing: zinc is soluble in acid and soluble in alkali, so it is called 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 the steel matrix, the zinc coating is an anodic coating. It is mainly used to prevent corrosion of steel. The protective performance of the zinc 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.
Process principle of galvanizing: In a rotating drum equipped with plated parts, glass balls, zinc powder [colored business machine: zinc powder standard], water and agent, the glass ball as the impact medium rotates with the drum, and the plated parts Friction and hammering on the surface produce mechanical and physical energy. Under the action of the chemical agent, the plated zinc powder is "cold welded" onto the surface of the plated part to form a smooth, uniform and fine coating with thickness.www.fhpails.com