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Hot-Dip Galvanizing Performance in Atmosphere






The corrosion rate of zinc is directly influenced by atmospheric conditions. Certain factors that specifically affect the corrosion of zinc include: temperature, humidity, rainfall, sulfur dioxide (pollution) concentration in the air, and air salinity. None of these factors can be singled out as the main contributor to zinc corrosion, but they all play a role in determining the corrosion protection hot-dip galvanized (zinc) coatings can provide in certain environments.

When galvanizing is exposed to the natural wet and dry cycles of the atmosphere, it develops a series of zinc byproducts on the surface called the patina. The patina is stable and non-reactive unless exposed to aggressive chlorides or sulfides. The patina is a key component in the longevity of the hot-dip galvanized coating in the atmosphere.

For corrosion classification purposes, atmospheres are generally divided into five groups:

Industrial Atmospheres

These environments are generally the most aggressive in terms of corrosion. Air emissions may contain some sulfides and phosphates that cause the most rapid consumption of the zinc coating. Automobiles, trucks and industrial plant exhaust are examples of these emission sources. Most city or urban area atmospheres are classified as industrial.

Suburban Atmospheres

These atmospheres are generally less corrosive than industrial areas and, as the term suggests, are found in the largely residential, perimeter communities of urban or city areas with little or no heavy industry

Temperate Marine Atmospheres

The galvanized coating’s time to first maintenance in marine environments is influenced by proximity to the coastline and prevailing wind direction and intensity. In marine air, chlorides from sea spray can react with the normally protective zinc corrosion products to form soluble zinc chlorides. When these chlorides are washed away, fresh zinc is exposed to corrosion. Temperate marine atmospheres are more corrosive than suburban atmospheres.

Tropical Marine Atmospheres

These environments are similar to temperate marine atmospheres except they are found in warmer climates. Tropical marine climates tend to be somewhat less corrosive than temperate marine climates, because many tropical areas are found relatively far removed from moderately industrial areas.

Rural Atmospheres

Rural environments are usually the least aggressive of the five atmospheric types. This is primarily due to the relatively low level of sulfur and other emissions found in such environments

Independent and industry testing of galvanized steel samples over decades in industrial, urban, rural, and marine environments, with varying degrees of chlorides, sulfides and other corrosive elements, has yielded performance data for galvanized steel in real world applications. For results, refer to the Time to First Maintenance chart.

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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