At first, galvanization is the common way to protect steel and iron preventing corrosion during service, by coating their surface with a protective layer of zinc. The main difference between the different coating way is how the zinc coating is applied.
1.Hot-dip galvanization involves immersing the steel or iron material in a bath of molten zinc at a temperature of approximately 450 degrees Celsius (840 degrees Fahrenheit). The high temperature allows the zinc to react with the surface of the metal, forming a metallurgical bond. This results in a thick, durable zinc coating that provides excellent protection against corrosion. Hot-dip galvanization is commonly used for large structural components, outdoor steel structures, and items exposed to harsh environments.
2.Theelectro-galvanization, also known as electroplating, is a process that uses an electric current to deposit a thin layer of zinc onto the surface of the steel or iron. The material is first cleaned and then immersed in an electrolyte solution containing zinc ions. When an electric current is applied, zinc ions are reduced and deposited onto the metal surface. Electro-galvanization produces a thinner zinc coating compared to hot-dip galvanization. It is often used for smaller, more intricate parts, such as fasteners, electrical conduits, and automotive components.
3.In one simple word for accumulating the general difference of such two galvanization:
3.1Hot dip galvanization is mainly for the large & outdoor structure and harsh environment, meanwhile the zinc coating is thick
3.2Electro-galvanization is used mainly on small & more intricate parts, of course the zinc coating is thin