1.What are the requirements for zinc coating on structural parts in highly corrosive environments?
For example, building structures, bridges, and port facilities located in coastal areas and areas with severe industrial pollution. Salt and pollutants in these environments are highly corrosive to steel. For example, in coastal salt spray environments, a thick zinc layer (such as Z275, with a zinc layer thickness of approximately 20μm) can effectively resist corrosion, achieving an annual corrosion rate of ≤1.2μm, ensuring the durability of the structure.
2.What are the requirements for the zinc layer on parts that are subject to frequent friction or wear?
For parts that frequently move and rub against each other in mechanical manufacturing, or parts in transportation equipment that frequently come into contact with and rub against goods, a thicker zinc layer can provide longer-lasting protection during friction, reducing exposure to the base material due to wear and tear, thereby extending the service life of the component.
3.What are the requirements for the zinc layer of components that require complex processing?
When cold-rolled galvanized steel is subjected to complex processing such as deep stamping and bending, a thicker zinc layer helps prevent the zinc layer from falling off or breaking during processing, thereby ensuring the corrosion resistance of the component after processing. For example, some parts in automobile manufacturing that require complex stamping and forming may use galvanized steel with a slightly thicker zinc layer.
4.What are the requirements for zinc coatings in facilities that are exposed to outdoor conditions for a long period of time and are difficult to maintain?
For example, outdoor billboard brackets and high-voltage transmission towers are exposed to the natural environment for a long time and are difficult to maintain and service frequently. A thicker zinc layer can provide longer-lasting corrosion protection and reduce structural damage and safety hazards caused by corrosion.
5.What are the requirements for zinc coating in projects with extremely high service life requirements?
Infrastructure projects such as large industrial plants and integrated pipeline corridors require steel with a long service life. Cold-rolled galvanized steel with a zinc layer thickness of no less than 275g/m² is usually selected to ensure the safety and stability of the structure over decades of use.