Powder Coating Hot Dipped Galvanized Steel
Powder coatings on hot-dip galvanized steel provide an excellent corrosion resistant coating. The selection of this duplex system has two major attractions; the duplex system provides a high-grade architectural finish that does not contain any volatile material and the coating is particularly abrasion resistant.
The powder coating is comprised of a polyester thermosetting resin that is applied to a clean galvanized surface and cured at temperature near 350ºF (180ºC).
Surface Preparation
The surface preparation required to promote good adhesion between the powder coating and the galvanized surface is similar to that of paints. A profiled galvanized surface will provide excellent surface for applying powder coatings.
Applying/Curing the Powder
Due to the equipment required to powdercoat steel, it is usually applied to newly galvanized steel. It is recommended that the galvanized surface be coated within 12 hours of galvanizing.
To promote superior adhesion of the powder coating the following should be considered:
- The galvanized steel should not be quenched after it has been galvanized
- The surface of the steel should remain clean
- When transporting the steel be sure to cover loads and keep dry
- If surface contamination has occurred, clean the steel with a proprietary solvent/detergent that is designed for cleaning prior to powder coating
- Maximum adhesion is best achieved by using a zinc phosphate treatment before powder coating the steel. Surface must be entirely clean as this treatment has no cleansing action
- Preheating steel prior to coating
- Use “degassing” grade polyester powder only. Anti-blistering agents, such as polyethylene oxide, can be added to the powder to prevent pinholing and promote good adhesion
Related References:
1. About Zinc
2. About Hot-Dip Galvanizing
3. HDG Hot-Dip Galvanizing Last Time
4. Cost of Galvanized Steel
5. Selection of Zinc Coatings
6. Zinc Coatings-Galvanized|Electrogalvanized|Galvanneal|Galfan
7. Physical Properties of HDG Hot-Dip Galvanized
8. HDG Hot-Dip Galvanized Abrasion Resistance Resistance to Mechanical Damage
9. Hot-Dip Galvanized Corrosion Protection and the Zinc Patina
10. HDG Hot-Dip Galvanized High Temperature Exposure
11. HDG Hot-Dip Galvanized Surface Reflectivity
12. HDG Hot Dip Galvanized Coating Structure
13. HDG Hot Dip Galvanized Bond Strength
14. HDG Hot Dip Galvanized Coating Uniformity
15. HDG Hot Dip Galvanized Coating Thickness
16. Powder Coating Hot Dipped Galvanized Steel
17. Painting Hot-Dippped Galvanized Steel
18. Painting Hot-Dipped Galvanized Steel Surface Preparation
19. Surface Coatings for Corrosion
20. Hot-Dip Galvanizing Surface Preparation
21. Hot-Dip Galvanizing Galvanizing
22. Hot-Dip Galvanizing Inspection
23. Characteristics of Zinc
24. Hot-Dip Galvanizing Performance in Atmosphere
25. Hot-Dip Galvanizing in Atmosphere Time to First Maintenance
26. Hot-Dip Galvanizing Performance in Soil
27. Soil Corrosion Data for Corrugated Steel Pipe
28. Hot-Dip Galvanizing Performance in Water
29. Cause of Zinc Corrosion
30. Corrosion of Zinc Coated Steel in Selected Natural Fresh Water
31. Corrosion of Zinc and Zinc Coated Steel in Sea Water
32. Corrosion of Zinc Coating in Industrial and Domestic Water
33. Concrete Corrosion of Hot Dip Galvanizing
34. Concrete corrosion resistance of hot dip galvanized reinforcing
35. Removal of Forms Concrete Corrosion
36. Zinc Reaction in Concrete Corrosion
37. Concrete Corrosion References
38. Hot-Dip Galvanizing Performance in Chemical Solutions
39.Hot-Dip Galvanizing Performance in Contact with Other Metals
40. Hot-Dip Galvanizing Performance in contact with Treated Wood
41. Hot-Dip Galvanizing Performance in contact with Food
42. Hot-Dip Galvanizing Performance in Extreme Temperature
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