Design of steel structures against corrosion (II)

 Steel Structure Surface Related Design

Anti-corrosion Coating

1. The adhesion between the anti-corrosion coating and steel base should not be lower than 5MPa.

2. For newly designed steel structures, it is not suitable to use rust coating for descaling and painting, and when rust coating is required for repairing the steel structures of existing buildings, it should be used after the demonstration.

3. The fireproof coating on the surface of the steel structure generally does not have an anticorrosive effect, so the fireproof coating should not be used as an anticorrosive coating. The surface of the steel structure should be coated with antirust primer, corrosion-resistant intermediate coating, fireproof coating, and then anticorrosive surface coating according to the structure of protection treatment.

4. Galvanized steel plating amount of micro-corrosive, weak corrosion or corrosive environment in the double-sided galvanized amount should not be less than 180g/m2, 250g/m2, or 280g/m2; hot-dip galvanized steel pipe galvanized layer weight should not be less than the average value of 500g/m2, which shall not be less than 480g/m2 in any of these styles.

5. fasteners hot dip galvanized layer thickness should not be less than 40um local, batch average thickness should not be less than 50μm; and steel components galvanized layer thickness should not be less than 80μm. (1μum = 7.2g/m2)



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