What's the difference between galvanizing and hot galvanizing?

The difference between hot-dip galvanizing and electro-galvanizing lies in the process, service life, technology, appearance and concept. The process is different: electroplating is to put zinc ingots and zinc wires into an electrified liquid pool. Under the action of current magnetic field, zinc atoms lose electrons and become ions, which dissociate from zinc blocks and gradually adsorb to the plated parts. Hot plating is to immerse the plated parts in hot-melt zinc bath and obtain zinc layer through intense high-temperature chemical reaction. Service life: Electroplated products have a short service life due to the thin zinc layer. According to the thickness of zinc layer, hot dip galvanized products will be seriously oxidized in the next few years or decades.

hot galvanizing

Hot dip galvanizing is an alloy layer formed by the reaction between molten metal and iron matrix, which combines the matrix with the coating. Hot dip galvanizing is to pickle the steel first. In order to remove iron oxide from the steel surface, after pickling, it is cleaned in a tank with ammonium chloride or zinc chloride aqueous solution or mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to a hot dip plating tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.

electrogalvanizing

Galvanizing, also known as cold galvanizing in industry, is a process of forming a uniform, dense and well-bonded metal or alloy coating on the surface of parts by electrolysis. Compared with other metals, zinc is a relatively cheap and easy-to-plate metal, belonging to low-value corrosion-resistant electroplating layer, which is widely used to protect steel parts, especially to prevent atmospheric corrosion, and for decoration. Electroplating techniques include bath plating (or hanging plating), barrel plating (suitable for small parts), blue plating, automatic plating and continuous plating (suitable for wire and strip).

Characteristics of electro-zinc plating

The purpose of electro-zinc plating is to prevent steel objects from being corroded, improve the corrosion resistance and service life of steel, and also increase the decorative appearance of products. Over time, steel will be weathered and corroded by water or soil. The corroded steel accounts for almost one tenth of the total steel in China every year. Therefore, in order to protect the service life of steel or its parts, electro-zinc plating is generally used to treat steel.