English
Aluminum anode is a popular choice for off-shore cathodic protection due to its light weight, simplicity of installation and adaptability to cast into a variety of sizes. As the stand-off anode protrudes from the surface installed, so the anode material is not in direct contact with the surface to be protected. Thus, the stand-off anode is better utilized over their lifetime — its anode utilization factor can reach up to 85 to 90%.
◉ GALVALUM III (Al-Zn-In-Si)
| Element | Content (%) |
|---|---|
| Zinc (Zn) | 2.000 ~ 6.000 |
| Indium (In) | 0.010 ~ 0.020 |
| Silicon (Si) | 0.080 ~ 0.200 |
| Iron (Fe) | 0.130 max. |
| Copper (Cu) | 0.006 max. |
| Cadmium (Cd) | — |
| Other Impurities | 0.100 max. |
| Aluminum (Al) | Remainder |
DNV-RP-B401-2011 (Al-Zn-In)
| Element | Content (%) |
|---|---|
| Zinc (Zn) | 2.500 ~ 5.750 |
| Indium (In) | 0.015 ~ 0.040 |
| Silicon (Si) | 0.120 max. |
| Iron (Fe) | 0.090 max. |
| Copper (Cu) | 0.003 max. |
| Cadmium (Cd) | 0.002 max. |
| Other Impurities | 0.100 max. |
| Aluminum (Al) | Remainder |
GS EP COR 201 (Al-Zn-In)
| Element | Content (%) |
|---|---|
| Zinc (Zn) | 4.750 ~ 5.750 |
| Indium (In) | 0.015 ~ 0.020 |
| Silicon (Si) | 0.060 ~ 0.120 |
| Iron (Fe) | 0.120 max. |
| Copper (Cu) | 0.003 max. |
| Cadmium (Cd) | 0.002 max. |
| Other Impurities | 0.100 max. |
| Aluminum (Al) | Remainder |
Electrochemical Properties
| Technical Measurement | Performance |
|---|---|
| Open Circuit Voltage (min.) | -1.10 Volts |
| Closed Circuit Voltage (min.) | -1.05 Volts |
| Current Capacity | 2500 A.h/kg (1135 A.h/lbs) |
| Current Efficiency (min.) | 90% |
| Consumption Rate | 3.4 kg/A.y (7.6 lbs/A.y) |
* The open/closed circuit voltage is with respect to a Ag/AgCl reference electrode.
Practical Application
Our aluminium anodes are used to prevent corrosion of steel structures in seawater and brackish water. Although the voltage rate is lower than that of magnesium anodes, aluminium anodes have a much slower consumption rate, making them ideally suited for marine applications – offshore drilling platforms, wind turbine foundation and harbour facilities.
