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Aluminium alloy chemical composition
The POLCOR aluminium anodes are cast alloys of pure aluminium, zinc and indium. The addition of Indium acts beneficially as a depassivating agent of aluminium. So the anodes dissolves in a regular way protecting the steel structures in the marine environment.
The chemical and electrochemical characteristics of POLCOR aluminium anodes are presented in the following table:
|
Elements |
|
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Zn |
3.5-5.0 (range)% |
|
In |
0.02-0.05 (range)% |
|
Fe |
0.16 (max) % |
|
Cu |
0.01 (max) % |
|
Si |
0.1 (max) % |
|
Others |
0.04 (max) % |
|
AI |
Balance |
|
Capacity |
2680Ah/Kg |
|
Efficiency |
90% |
|
Potential |
1100Ag/AgCl electrolyte artificial sea water DIN 50905 | It is important to note that there is a variety of Aluminium anodes in the market with various compositions. Although Al anodes provide significant advantages over the traditional zinc anodes, in terms of weight and electrochemical characteristics, the risk of passivation is generally greater. The Polcor anodes are using Al-Zn-In alloys since these alloys have been proven to be the most reliable material. The optimisation of the composition has been performed in advanced University laboratories.
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Aluminum Alloys 
