Galvanized scratched steel coil is able to prevent surface of steel sheet from suffering the corrosion, lengthens its available time. The reason are the following:
1. Zinc coating can prevent corrosive substances such as acid (such as acid rain) from contacting the underlying metal.
2. Galvanizing treatment can prevent rust. When the coating is scratched, zinc is still more likely to "lost anode" than base metals, thereby protecting it from rust.
3. Zinc protects metals by corroding faster than alkaline metals. For example, a special ingredient called "chromate" is added to galvanized metal, which makes it corrode faster. The reason for this is to corrode the zinc coating first to protect the underlying metal from corrosion.
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