Electro-galvanizing and hot-dip galvanizing are two common anti-corrosion treatments used to protect metal surfaces from corrosion. They are widely used in industry, construction and manufacturing.
Electroplating Zinc:
Process: Electro-galvanizing is a process of anti-corrosion by coating a thin layer of zinc on the metal surface. The metal piece serves as the cathode and is placed in an electrolytic bath containing a zinc salt solution, and then a layer of zinc is deposited on the metal surface by applying an electric current.
Features: Electro-galvanizing usually forms a thin and uniform zinc layer, providing good appearance and a certain degree of anti-corrosion properties. This processing method is suitable for small metal parts and complex-shaped components.
Hot-dip Galvanizing:
Process: Hot-dip galvanizing is a process in which metal parts are completely immersed in preheated molten zinc to form a layer of zinc. During the hot-dip galvanizing process, a chemical reaction occurs between the metal surface and molten zinc to form a zinc-iron alloy layer that is firmly bonded to the metal substrate.
Features: The zinc layer formed by hot-dip galvanizing is thick and uniform, providing excellent anti-corrosion performance and durability. Hot-dip galvanizing is suitable for large structural parts, pipes, guardrails, steel and other applications that require long-term corrosion protection.
Main differences:
Zinc layer thickness: The zinc layer formed by hot-dip galvanizing is usually thicker than electro-galvanizing, providing longer-lasting anti-corrosion protection.
Scope of application: Electro-galvanizing is suitable for small and complex-shaped metal parts, while hot-dip galvanizing is suitable for large structural parts and applications that require long-term protection.
Process complexity: The process of hot-dip galvanizing is relatively complex, involving metal pretreatment, immersion plating and other steps, while the process of electro-galvanizing is relatively simple.