Hot-dip galvanizing reacts molten metal with an iron matrix to produce an alloy layer, thereby combining the matrix and the coating. Hot-dip galvanizing is to pickle the steel parts first. In order to remove the iron oxide on the surface of the steel parts, after pickling, they are cleaned in an aqueous solution of ammonium chloride or zinc chloride or a mixed aqueous solution of ammonium chloride and zinc chloride. , and then sent into the hot dip plating tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion, and long service life.

Electro galvanizing, also known as cold galvanizing in the industry, is a process that uses electrolysis to form a uniform, dense, and well-bonded metal or alloy deposition layer on the surface of the workpiece. Compared with other metals, zinc is a relatively cheap and easy-to-plat metal. It is a low-value anti-corrosion electroplating layer and is widely used to protect steel parts, especially to prevent atmospheric corrosion, and for decoration. Plating technologies include tank plating (or rack plating), barrel plating (suitable for small parts), blue plating, automatic plating and continuous plating (suitable for wires and strips).

The purpose of electro-galvanizing is to prevent steel objects from being corroded, improve the corrosion resistance and service life of steel, and also add a decorative appearance to the product. Over time, steel will be weathered and corroded by water or soil. The steel that is corroded every year in China accounts for almost one-tenth of the total steel volume. Therefore, electro-galvanizing is generally used to process steel to protect the service life of steel or its parts.

The differences between hot-dip galvanizing and electro-galvanizing mainly include process flow, service life, appearance, concept, etc. Electroplating is placing zinc ingots and zinc wires in an electrified liquid pool. Under the action of the current magnetic field, the zinc atoms lose their electrons and become ions, which dissociate from the zinc block and gradually adsorb to the parts to be plated. Hot plating is to immerse the parts to be plated in a pool of hot molten zinc and obtain the zinc layer through a violent high-temperature chemical reaction process. Electroplated products have a short service life due to their thin zinc layer. The thickness of the zinc layer of hot-dip products may cause serious oxidation in the next few years or decades.

Answers

• 
  What are the differences in thickness and production process between medium and thick steel plates and hot rolled steel plates? 20/12/2024 16:13:18
• 
  What are the differences between PE lining and plastic coating? 04/12/2024 17:18:59
• 
  What are the acceptance criteria for hot-dip galvanized square tubes? 03/12/2024 05:26:54
• 
  How to distinguish between 304 and 201 stainless steel plates? 29/11/2024 17:07:20
• 
  Stainless steel wire rope or galvanized steel wire rope, which one is stronger? 27/11/2024 15:03:48