Question

Distinguish between galvanic series and electrochemical series

Answer 1

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 electro-chemical series is fixed.It gives no information regarding positions of alloys.The position of a metal in this series is permanently fixed.this series comprises of 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 sea-water, without their oxide films, if any removed.The position of a given metal may shift in galvanic series.Since alloys are included in galvanic series, so their corrosion can be studied from this series.The position of a metal, when present in the form of an alloy, is different from that of pure metal.This series comprises of 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.