Aluminum anode is a type of sacrificial anode, also known as aluminum alloy sacrificial anode , aluminum sacrificial anode, aluminum block, etc. It is called a sacrificial anode because it is corroded by itself, sacrificing itself and protecting more important metals or equipment. Sacrificial anode Made of materials that are easily corroded and installed on protected bodies such as pipelines and storage tanks to protect other parts of the system from corrosion. Sacrificial anode is also known as primary battery anode. Aluminum anode is one of the commonly used sacrificial anodes and can be applied to many types of industrial equipment to prevent corrosion.
Chemical composition of aluminum anode
| Types | Zn | In | Cd | Sn | Mg | Si | Ti | Impurities, not more than | Al |
| Si | Fe | Cu |
| Al-Zn-In-Cd | 2.5-4.5 | 0.018-0.050 | 0.005-0.02 | — | — | — | — | 0.1 | 0.15 | 0.01 | Balance |
| Al-Zn-In-Sn | 2.2-5.2 | 0.020-0.045 | — | 0.018-0.035 | — | — | — | 0.1 | 0.15 | 0.01 | Balance |
| Al-Zn-In-Si | 5.5-7.0 | 0.025-0.035 | — | — | — | 0.10-0.15 | — | 0.1 | 0.15 | 0.01 | Balance |
| Al-Zn-In-Sn-Mg | 2.5-4.0 | 0.020-0.050 | — | 0.025-0.075 | 0.50-1.00 | — | — | 0.1 | 0.15 | 0.01 | Balance |
| Al-Zn-In-Mg-Ti | 4.0-7.0 | 0.020-0.050 | — | — | 0.50-1.50 | — | 0.01-0.08 | 0.1 | 0.15 | 0.01 | Balance |
Electrochemical performance of aluminum anode
| Performance, types, indicators | Open circuit potential
-V(SCE) | Working potential
-V(SCE) | Actual capacitance A · h/kg | Current efficiency
% | condition |
| Ordinary aluminum alloy anode | 1.10-1.18 | 1.05-1.12 | ≥2400 | ≥85 | Corrosion products are easy to fall off and dissolve evenly on the surface. |
| High-efficiency aluminum alloy anode | 1.10-1.18 | 1.05-1.12 | ≥2600 | ≥90 |
| Highly activated aluminum alloy anode | 1.45-1.50 | 1.40-1.45 | ≥2080 | ≥70 |
