Galvanizing, also known as hot-dip galvanizing and hot-dip galvanizing, is to immerse the derusted steel parts into the molten zinc at about 500 ℃, so that the zinc layer is attached to the surface of the steel parts, thus achieving the purpose of corrosion prevention. It is an effective metal corrosion prevention method, mainly used for metal structure facilities in various industries. Hot dip galvanizing is developed from the older hot-dip galvanizing method. It has a history of more than 180 years since France applied hot-dip galvanizing to industry in 1836. However, the hot-dip galvanizing industry has developed on a large scale with the rapid development of cold-rolled strip in recent decades. Hot dip galvanizing process flow: finished product Pickling - water washing - adding auxiliary plating solution - drying - hanging plating - cooling - medicating - Cleaning - polishing - hot dip galvanizing completion.
Cold galvanizing coating is mainly used to prevent corrosion by electrochemical principle. Hot dip galvanizing is a method of immersing steel components in molten zinc to obtain metal coating. The corrosion resistance of hot galvanizing is higher than that of cold galvanizing. Moreover, hot galvanizing will not rust in several years, while cold galvanizing will rust in three months.
The zinc layer of hot-dip galvanizing is relatively thick, with a thickness of more than 10um. Although the surface is bright, it is rough and there are zinc flowers. The zinc layer of cold galvanizing is very thin, only 3-5um thick. Although the surface is smooth, it will be gray and dirty, with good processing performance and poor corrosion resistance
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