Water Corrosion Data
Corrosion of Zinc-Coated Steel in Selected Natural Fresh Waters
| Location and water | Type of zinc | Years | Agitation | Corrosion rate (µm/year) |
|---|---|---|---|---|
| Gatun Lake, Canal Zone Tropical freshwater | Intermediate | 4 | Stagnant | 13 |
| Gatun Lake, Canal Zone Tropical freshwater | Intermediate | 8 | Stagnant | 10 |
| Pedro Miguel locks, Panama Freshwater | Special high grade | 5 | 18 | |
| Pedro Miguel locks, Panama Freshwater | High grade | 5 | 13 | |
| Pedro Miguel locks, Panama Freshwater | Intermediate | 5 | 11 | |
| Pedro Miguel locks, Panama Freshwater | Select | 5 | 14 | |
| Pedro Miguel locks, Panama Freshwater | Prime Western | 5 | 13 | |
| Ampari River, Brazil Freshwater | 0.4 | 2.8 ft/s flow | 137 | |
| Ampari River, Brazil Freshwater | 0.45 | 2.2 ft/s flow | 198 | |
| Source: Porter, F. C. Corrosion Resistance of Zinc and Zinc Alloys. Dekker, New York, 523pp. 1994. | ||||
Corrosion of Zinc and Zinc-Coated Steel in Sea Water
| Location and water | Type of zinc | Type of test | Years | Agitation | Corrosion rate (µm/year) |
|---|---|---|---|---|---|
| Eastport, Maine Seawater | 99.1% zinc | Mean tide level | 3 | 25 | |
| Eastport, Maine Seawater | 99.1% zinc | Immersion | 3 | 16 | |
| Bristol Channel Seawater | Prime Western | Immersion about 93% of time | 4 | 91 | |
| Bristol Channel Seawater | Galvanized bar | Immersion about 93% of time | 4 | 64 | |
| Southhampton docks Seawater | Prime western | At half-tide level | 3 | 13 | |
| Southhampton docks Seawater | High grade | At half-tide level | 3 | 14 | |
| Southhampton docks Seawater | Galvanized plate | Immersion | 1 | 28 | |
| Fort Amador, Canal Zone Tropical, Pacific Ocean | Intermediate | Immersion | 4 | 0.15 m/s flow | 20 |
| Fort Amador, Canal Zone Tropical, Pacific Ocean | Intermediate | Immersion | 8 | 0.15 m/s flow | 16 |
| Fort Amador, Canal Zone Tropical, Pacific Ocean | Intermediate | Mean tide level | 4 | 0.15 m/s flow | 23 |
| Fort Amador, Canal Zone Tropical, Pacific Ocean | Intermediate | Mean tide | 8 | 0.15 m/s flow | 14 |
| Panama Seawater | Cast-Prime Western | Immersion | 1 | 25 | |
| Panama Seawater | Cast-Special high-grade | Immersion | 1 | 25 | |
| Kure Beach, North Carolina Seawater | Special high-grade | Immersion | 0.5 | Flowing | 48 |
| Kure Beach, North Carolina Seawater | Special high-grade | Immersion | 4 | Flowing | 20 |
| Kure Beach, North Carolina Seawater | Brass special | Immersion | 0.5 | Flowing | 48 |
| Kure Beach, North Carolina Seawater | Brass special | Immersion | 4 | Flowing | 18 |
| Kure Beach, North Carolina Seawater | Galvanized | Immersion | 0.5 | Flowing | 48 |
| Kure Beach, North Carolina Seawater | Galvanized | Immersion | 1 | Flowing | 23 |
| Kure Beach, North Carolina Seawater | Galvanized | Immersion | 3.5 | Flowing | 15 |
| Kure Beach, North Carolina Seawater | Galvanized | Immersion | 5 | Flowing | 13 |
| Gosport and Emsworth Seawater | Hot-dipped | Immersion | 6 | Flowing | 9 |
| Gosport and Emsworth Seawater | Hot-dipped | Immersion | 6 | Flowing | 9 |
| Gosport and Emsworth Seawater | Cyanide, electrodeposit | Immersion | 6 | Flowing | 8 |
| Gosport and Emsworth Seawater | Sprayed, molten metal pistol | Immersion | 6 | Flowing | 4 |
| Gosport and Emsworth Seawater | Sprayed, powder pistol | Immersion | 6 | Flowing | 17 |
| Gosport and Emsworth Seawater | Sprayed, wire pistol | Immersion | 6 | Flowing | 6 |
| Source: Porter, F. C. Corrosion Resistance of Zinc and Zinc Alloys. Dekker, New York, 523pp. 1994. | |||||
Corrosion of Zinc and Zinc Coatings Immersed in Various Industrial and Domestic Waters
| Type of water | Corrosion Rate (µm/yr) |
|---|---|
| Mine water, pH 8.3, 100 ppm hardness, aerated | 31 |
| Mine water, 160 ppm hardness, aerated | 30 |
| Mine water, 110 ppm hardness, aerated | 46 |
| Demineralized water | 137 |
| River water, moderate soft | 61 |
| River water, treated by chlorination and copper sulfate | 64 |
| Tap water, pH 5.6, 170 ppm hardness, aerated | 142 |
| Spray cooling water, chromate treated, aerated | 15 |
| Hard water | 16 |
| Soft water | 15 |
| Sources: Defrancq, J. N.; Zinc and zinc-lead alloys in domestic water, Br. Corros. J. 17, 125-130, 1982. Slunder, C. J., and Boyd, W. K.; Zinc: Its Corrosion Resistance, 2nd ed., International Lead Zinc Research Organization, Inc., New York, 1986. | |