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Hello, every metal, including stainless steel, is prone to corrosion. The chemical composition of the metal, the application environment, and the environmental conditions it is exposed to determine the duration of corrosion. Subsequent processes such as coating or painting create a barrier between the metal and the outside environment. This barrier protects the metal from external factors and reduces the risk of corrosion. However, over time, this barrier can wear down, scratch, or deteriorate. In this case, the metal comes back into direct contact with external conditions and becomes exposed to corrosion. Hot Dip Galvanizing and Paint Combination Both powder paint and wet paint applications can be made on hot dip galvanized surfaces. However, the gas emission that occurs after the galvanizing process should be considered. Paint applications made before the completion of gas emission can cause the paint to be thrown off or peel from the surface. To prevent this problem: Gas Emission Process: After galvanization, the metal should be allowed to complete its gas emission. Surface Preparation: Prior to painting, the surface should be cleaned and primed appropriately for the paint application. Apart from this, direct paint applications can be made on galvanized sheet. However, proper surface preparation is of critical importance in this process. For long-term protection, I can suggest some combinations, but you should remember that these will be average durations: Hot Dip Galvanizing: 10-15 years Galvanized + Epoxy Based Powder Paint: 15-20 years Galvanized + Polyurethane Wet Paint: 20-25 years Zinc Phosphate Coating + Galvanized + Paint: 25-30 years For more information on your specific application and project requirements, you can get support from the Xometry team: info@xometry.com.tr

[Dogan Mutlu]

Hello,

I am making railings and wrought iron outdoors with S235 steel. The products will be electrostatically painted. What treatment is required for these products not to rust and the paint not to peel off for at least 25 years? I have heard that the paint peels off quickly in hot-dip galvanizing applications. Would sandblasting + primer + paint be enough? Or what type of paint and procedures should be applied on hot-dip galvanizing?

I wish you good work.

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[Hasan Yerli]

When you use phosphate coating to prevent rusting, it increases the adhesion of the paint and becomes weather-resistant in the long run. We had found such a solution for rail system parts.

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[Sinem Çiftçi]

Hello, every metal, including stainless steel, is prone to corrosion. The chemical composition of the metal, the application environment, and the environmental conditions it is exposed to determine the duration of corrosion.

Subsequent processes such as coating or painting create a barrier between the metal and the outside environment. This barrier protects the metal from external factors and reduces the risk of corrosion. However, over time, this barrier can wear down, scratch, or deteriorate. In this case, the metal comes back into direct contact with external conditions and becomes exposed to corrosion.

Hot Dip Galvanizing and Paint Combination
Both powder paint and wet paint applications can be made on hot dip galvanized surfaces. However, the gas emission that occurs after the galvanizing process should be considered. Paint applications made before the completion of gas emission can cause the paint to be thrown off or peel from the surface.

To prevent this problem:
Gas Emission Process: After galvanization, the metal should be allowed to complete its gas emission.
Surface Preparation: Prior to painting, the surface should be cleaned and primed appropriately for the paint application.

Apart from this, direct paint applications can be made on galvanized sheet. However, proper surface preparation is of critical importance in this process.

For long-term protection, I can suggest some combinations, but you should remember that these will be average durations:

Hot Dip Galvanizing: 10-15 years
Galvanized + Epoxy Based Powder Paint: 15-20 years
Galvanized + Polyurethane Wet Paint: 20-25 years
Zinc Phosphate Coating + Galvanized + Paint: 25-30 years

For more information on your specific application and project requirements, you can get support from the Xometry team: info@xometry.com.tr

Automatically translated from: Türkçe

See original

0