Why are iron drums always galvanized?

Nowadays, more and more manufacturers will coat a layer of zinc on the surface of iron drums. Why is this?

We believe that zinc is easily soluble in acid and alkali, so it is called amphoteric metal. Zinc hardly changes in dry air. In humid air, a dense basic 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 organic acid at high temperature and high humidity, the zinc coating is easily corroded. The standard electrode potential of zinc is -0.76V. For the steel substrate, the zinc coating is an anodic coating, which is mainly used to prevent the corrosion of steel, and its protective performance has a great relationship with the thickness of the coating. The protective and decorative properties of zinc coating can be significantly improved after passivation treatment, dyeing or coating with light protectant.

The process principle of galvanizing: in a rotating drum equipped with plated parts, glass balls, zinc powder [non-ferrous business opportunity: zinc powder standard], water and accelerator, the glass ball as the impact medium rotates with the drum, and the galvanizing Friction and hammering on the surface of the parts generate mechanical and physical energy. Under the action of chemical accelerators, the coated zinc powder is "cold-welded" to the surface of the plated parts to form a smooth, uniform and meticulous coating with a certain thickness.