This galvanized steel is made by passing steel through a plated kiln made of zinc and a small amount of aluminum to plate zinc on its surface.
Hot-dip zinc-coated steel sheet does not easily rust because zinc, which is easily ionized compared with iron, is a compound of zinc carbonate. Zinc protects the iron surface, and it has a high ionization tendency even though the zinc surface is broken. This electrochemical production property, which causes zinc to melt but maintaining iron in its solid form, prolongs steel’s life span.
Hot-dip zinc-coated steel, which is manufactured through a continuous zinc-coated plating process, has excellent zinc adhesion and very thin iron–zinc alloy layer. Thus, the plating layer is hardly detached even in the drawing process. The hot-dip zinc-coated steel is manufactured through a vertical furnace rather than the existing horizontal furnace. It has good machinability similar to cold rolled steel so that it can be used in various works.
Hot-dip zinc-coated steel is usually used after painting. The adhesion and corrosion resistance after painting is largely affected by the coating pretreatment process. Most materials for painting use oiling processing for anticorrosion without using a chromate treatment. Complete degreasing before painting leads to a good reaction of phosphate coating or chrome coating. Thus, it secures good coating film adhesion and corrosion resistance.
|Classification Standards||KS D3506||JIS G3302||ASTM||EN10142|
|None-Aging Extra Drawing||SGCD3N||SGCD3N||A642||A653-DQSK||DX54D|