The electrochemical series is an orderly listing of standard half-cell electrode potential and the galvanic series is an orderly listing of corrosion potential for different metals and alloys. They both are based on thermodynamic analysis.
Let us have a deep insight into the discuss the electrochemical and galvanic series and the difference between them.
Let us have a deep insight into the discuss the electrochemical and galvanic series and the difference between them.
Electrochemical series :
- Electrode potentials are measured by dipping pure metals in their salt solution of IM concentration, without any oxide films on them.
- The position of a metal in the electrochemical series is fixed.
- It gives no information regarding the positions of alloys.
- The position of metal is permanently fixed in this series.
- this series comprises metals and non-metals.
- It predicts the relative displacement tendencies.
- It is absolute.
- It is quantitative.
- it is a series only for pure metals.
- It is used for theoretical calculations.
Galvanic series :
- This series was developed by studying corrosion of metals and alloys in unpolluted seawater, without their oxide films, if any removed.
- In galvanic series, the position of a given metal may shift.
- Their corrosion can be studied from this series since alloys are included in galvanic series
- The position of metal, when present in the form of an alloy, is different from that of pure metal.
- This series comprises metals and alloys.
- It predicts the relative corrosion tendencies.
- It is relative.
- It is qualitative.
- It is a series for pure metals and alloys also.
- It is used for practical applications.
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