Zinc anode is a commonly used cathodic-protection material relying on electrochemical principles for active corrosion protection. Made from refined high-purity zinc alloy, it requires no external power, is maintenance-free, and causes no over-protection damage to the substrate. Suitable for seawater, freshwater and low-resistivity soil, it is widely used in marine, pipeline, storage-tank and steel-structure engineering, serving as an economical and durable long-term anti-corrosion solution for ship and marine applications, offshore engineering, buried oil/gas and water-supply pipelines, storage-tank bottoms, steel bridges, hydraulic facilities and various metal equipment.
| Element | Al | Pb | Fe | Cu | Cd | Others | Zn |
|---|---|---|---|---|---|---|---|
| ASTM-B418 TYPE I | 0.100~0.500 | 0.006 max. | 0.005 max. | 0.005 max. | 0.025~0.070 | 0.100 max. | Bal. |
| ASTM-B418 TYPE II | 0.005 max. | 0.003 max. | 0.0014 max. | 0.002 max. | 0.003 max. | 0.100 max. | Bal. |
| Technical Measurement | ASTM-B418 TYPE I | ASTM-B418 TYPE II |
|---|---|---|
| Open Circuit Voltage (min.) | -1.05 Volts | -1.10 Volts |
| Close Circuit Voltage (min.) | -1.00 Volts | -1.05 Volts |
| Current Capacity | 780 A.h/kg (354 A.h/lbs) | 740 A.h/kg (335 A.h/lbs) |
| Current Efficiency (min.) | 95% | 90% |
| Consumption Rate | 11.2 kg/A.y (24.8 lbs/A.y) | 11.9 kg/A.y (26.2 lbs/A.y) |
*The open/close circuit voltage is with respect to a saturated calomel electrode.