What is the difference between Cold-galvanized Stainless Steel Expanded Wire Mesh and Hot-Dip Galvanized Stainless Steel Expanded Wire Mesh?
1. Hot-dip galvanizing, also known as hot-dip galvanizing, melts the zinc ingot at high temperature, puts some auxiliary materials, and then immerses the metal structural member in the galvanizing tank to attach a layer of zinc to the metal member. . The advantage of hot-dip galvanizing is that it has strong anti-corrosion ability, and the adhesion and hardness of the galvanized layer are good.
"Cold plating" means "electroplating", that is, the zinc salt solution is electrolyzed, and the plating part is plated. Generally, there is no heating, and the amount of zinc is small, and it is easy to fall off in a humid environment.
Hot-dip galvanizing is a chemical treatment and belongs to an electrochemical reaction. Cold galvanizing is a physical treatment, except that a layer of zinc is applied to the surface, so the zinc layer is easy to fall off. Hot-dip galvanizing is often used in construction.
Continuous hot-dip galvanizing process: steel → heating → cooling to galvanizing temperature → galvanizing → cooling
Cold galvanizing is electroplating zinc, only 10-50g/m2, and its corrosion resistance is much worse than hot dip galvanizing. The price of electroplating is relatively cheaper.
Hot-dip galvanizing is the galvanization of the surface of the steel body under hot-dip conditions. Its adhesion is very strong and it is not easy to fall off. Although the hot-dip galvanized pipe also has rust phenomenon, it can meet the technology and hygiene in a long period. Claim.
2, environmental issues
Hot galvanized pollutants emit less.
The hot-dip galvanized contaminants are mainly used to pickle the waste acid of the workpiece.
The cold galvanized contaminants mainly include the waste acid of the pickled workpiece, the electroplating waste liquid, the waste passivation liquid, and the like.
The types and quantities of pollutants from cold-dip galvanizing are much higher than those of hot-dip galvanizing.
Hot dip galvanizing: hot dip galvanizing is generally carried out after the edging process is completed. When the thickness of the loaded flat steel is not less than 5 mm, the average zinc layer weight after galvanizing is not less than 610 g/m2; when the thickness of the loaded flat steel is less than 5 mm When the average zinc layer weight after galvanizing is not less than 460 g / square meter, the quality and requirements after galvanizing should meet the requirements of GB/T13912.
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