one、Basic knowledge of hot-dip galvanized steel sheet
Hot dip galvanized steel sheet is made by immersing a thin steel sheet into a molten zinc bath，A steel plate with a zinc layer attached to its surface。Mainly produced using continuous galvanizing process，Has the following characteristics：
Strong corrosion resistance：Zinc layer can effectively prevent steel plates from rusting，long service life。
Good surface quality：smooth，Suitable for deep processing。
Economical and practical：Relatively low cost，Widely used in architecture、household electrical appliances、Automotive and other fields。
Hot dip galvanized steel sheet can be divided into hot-rolled substrate galvanizing and cold-rolled substrate galvanizing according to the substrate type。Cold rolled substrate galvanized generally has a thinner thickness，Better surface quality；Galvanized hot-rolled substrates are suitable for thicker sheets。
two、Common problems with hot-dip galvanized steel sheet
Zinc layer peeling off：Possible due to surface oxidation、Cold rolling emulsion is not clean、Due to factors such as low aluminum content in zinc pots。
White rust and black spots：Usually due to the surface not being coated with oil、Caused by residual moisture or humid storage environment。