difference between electro-galvanized and hot dip galvanized

 Difference between electro-galvanized and hot dip galvanized

 
1.The zinc layer:Electro-galvanized zinc layer generally in the 3 to 5 microns, special requirements can also reach 7 to 8 microns. The thickness of hot dip galvanized zinc layer can achieved more than 50 microns, the maximum can reach 100 microns.
Hot-dip galvanizing is a chemical treatment, is the electro-chemical reaction. Cold galvanizing is the physical address, just brush the surface layer of zinc, the zinc layer is easy to fall off. Construction in the use of hot dip galvanizing. Cold galvanized zinc is only 10-50g/m2, its own corrosion resistance than hot dip galvanized a lot of difference. Galvanized by a relatively cheaper price. Hot dip galvanized steel body is hot dip galvanized surface under the condition of its adhesion strong, not easy to fall off, although there hot dip galvanized pipe corrosion phenomenon, but in a very long period to meet technical, health requirements.
 
2. Technological differences 
Hot dip galvanized is the ingot melted at high temperatures, a number of supplementary material in place, then dipped galvanized metal structure slot, the metal component on a layer of zinc coating . The advantages of hot-dip galvanizing corrosion of his ability, adhesion and hardness of zinc coating is better. "Cold plated" or "plating", is the zinc salt solution by electrolysis, to the plating on the coating, generally do not have heating, small amount of zinc, the wet environment is very easy to fall off. 
First of all, is the difference between process: hot-dip galvanizing is the workpiece degreasing, pickling, dipping, drying liquid immersion in molten zinc certain period of time, can be raised. Also known as electro-galvanized cold galvanizing, is to use electrolysis devices work piece through the degreasing, pickling ingredients post into the zinc salt solution, and connect the anode electrolysis equipment; in place across parts of zinc plate connected to the electrolysis equipment positive, power on, use of current from the cathode to the anode of the directional movement of the workpiece will be deposited in a layer of zinc. Zinc finished the difference: no cold galvanized hot-dip galvanizing delicate bright appearance, but the thickness of zinc coating of cold galvanizing aspects of hot-dip galvanizing is a few times. Galvanized corrosion resistance is also several times.
 
3.Product use: Because general electro-galvanized sail spray test in less than 10 hours, but hot-dip galvanizing of the salt spray test can be reached in about 30 hours. The electroplating`s nails generally used in the packaging of some more sophisticated electronic products, appliances, etc. And hot dip galvanized nails used in bad environment is relatively poor, such as corrosion of air and liquid; relatively humid, such as beach houses and parapets connection.

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