Sacrificial anodes
Aluminum and zinc anodes for cathodic protection of offshore and marine assets
Deepwater provides zinc and aluminum anodes for offshore cathodic protection. We always abide by the strictest chemical composition standards published by NACE. All anodes that Deepwater provides in our proprietary systems are manufactured at an ISO 9000-certified foundry, pre-screened and approved by our engineers.
ANODES FOR NEW ASSETS
ALLOY SPECIFICATIONS
CHEMISTRIES FOR ALL DEPTHS
Water salinity and temperature requires different anode chemistries for optimal performance. Deepwater has the Deep07 and Deep10 aluminum chemistries for most seawater applications.
Chemical composition
| Alloy type | Deep7 Aluminum | Deep10 Aluminum | Zinc MIL-A-18001-K |
|---|---|---|---|
| Iron (Fe) | 0.07 max | 0.10 max | 0.005 max |
| Silicon (Si) | 0.10 max | 0.10 max | N/A (0.00) |
| Copper (Cu) | 0.003 max | 0.006 max | 0.005 max |
| Zinc (Zn) | 4.75 - 5.25 | 3.00 - 6.00 | remainder |
| Indium (In) | 0.015 - 0.025 | 0.010 - 0.020 | N/A (0.00) |
| Titanium (Ti) | 0.025 max | 0.025 max | N/A (0.00) |
| Others (each) | 0.02 max | 0.02 max | 0.10 max |
| Aluminum (Al) | remainder | remainder | 0.1 - 0.5 |
| Lead (Pb) | N/A (0.00) | N/A (0.00) | 0.006 max |
| Cadmium (Cd) | N/A (0.00) | N/A (0.00) | 0.025 - 0.07 |
Electrochemical properties
| Alloy type | Deep7 Aluminum | Deep10 Aluminum | Zinc MIL-A-18001-K |
|---|---|---|---|
| Open circuit potential | (-) 1.08 V vs Ag/AgCl sw. | (-) 1.08 V vs Ag/AgCl sw. | -1.05 Volts (Ag/AgCl) |
| Closed circuit potential(1) | (-) 1.05 V vs Ag/AgCl sw, | (-) 1.05 V vs Ag/AgCl sw, | N/A |
| Seawater capacity @25C | 1100 A-Hr/lb. (2420 A-Hr/Kg.) | 1100 A-Hr/lb. (2420 A-Hr/Kg.) | N/A |
| Seawater capacity @ 5C | 1100 A-Hr/lb. (2420 A-Hr/Kg.) | Variable (2) | N/A |
| Seabed mud capacity (3) | 950 A-Hr/lb (2090 A-hr/Kg.) | 950 A-Hr/lb (2090 A-hr/Kg.) | N/A |
| Seabed mud capacity @ 5C | 950 A-Hr/lb (2090 A-hr/Kg.) | Variable (2) | N/A |
| Nominal current capacity | N/A | N/A | 780 amp-hr/kg |
Physical properties
| Alloy type | Deep7 Aluminum | Deep10 Aluminum | Zinc MIL-A-18001-K |
|---|---|---|---|
| Alloy density | 0.105 lb/in3 (2.91 gm/cm3) | 0.105 lb/in3 (2.91 gm/cm3) | N/A |
| Cost ratio | Low Iron (Fe) Aluminum (Al) Ingot < 0.05 Fe | Normal Grade Al Sows | N/A |
| Raw material & conversion | 1.10 | 1.00 | N/A |
Retrofit anode systems
Related content
Technical papers
