The corrosion resistance of SGCC steel mainly depends on its hot dip galvanizing treatment. The following are details of the corrosion resistance of SGCC steel:
1. Zinc coating thickness: The hot dip galvanizing treatment of SGCC steel usually has a certain zinc coating thickness, generally 275 g/ m2 (g/m²). The thicker cover provides better corrosion protection and longer service life.
2. Barrier effect: SGCC steel's zinc coating forms a physical barrier that prevents water, oxygen and other corrosive media from coming into direct contact with the steel. This barrier effect can reduce the occurrence of corrosion and delay the corrosion rate of steel.
3. Self-healing ability: If the zinc coating of SGCC steel is slightly damaged or scratched, zinc has a self-healing ability. This is because zinc undergoes an electrochemical reaction in the atmosphere to form a protective product called zinc lye, which can fill and repair the damaged part of the covering layer, thereby further protecting the steel.
4. Galvanic effect: When the zinc coating of SGCC steel is damaged, a galvanic effect is formed. In a corrosive environment, zinc, as a more reactive metal, corrodes preferentially, protecting the steel from direct corrosion.
5. Phosphating treatment: In addition to hot dip galvanizing, some SGCC steel may also be phosphating. Phosphating is a steel surface treatment technology that provides additional corrosion protection by forming a layer of phosphating (such as zinc phosphating) on the steel surface.
It should be noted that the corrosion resistance of SGCC steel is relatively good, but not absolute. Corrosion of steel may still occur in extreme or special corrosive environments. Therefore, in practical applications, it is also necessary to evaluate according to the specific situation, and take appropriate preventive measures and maintenance measures to ensure that the corrosion resistance of SGCC steel is maximization.
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