What is the limitations of EMF series?
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The following are some of the limitations of the EMF series: The EMF series is only for the pure metals. The metals may not be in contact with concentrations of unit activity. Even some times the polarity may get reversed under some conditions. For example Iron-Zinc couple dipped in dilute HCl. NormRead more
The following are some of the limitations of the EMF series:
- The EMF series is only for the pure metals. The metals may not be in contact with concentrations of unit activity. Even some times the polarity may get reversed under some conditions. For example Iron-Zinc couple dipped in dilute HCl. Normally zinc is more active and corrodes to form ZnO,but if the temperature exceeds 60 degree Celsius, the polarity is reversed and iron starts coroding.
- EMF series does not reflect the effect of the protective surface films, which may form on some metals.
- EMF series does not take into account the effect of pH, which is significant many times. Even the effect of increase of temperature is ignored.
- EMF series may give you an idea of the metal that is most likely to corrode but it give no information as to the rate of corrosion, which is of great importance to an engineer.
See less1. Alloys are not included in this EMF series. 2. In real environmental situation activities of metals ions with their respective metals usually do not equal to unity.
1. Alloys are not included in this EMF series.
2. In real environmental situation activities of metals ions with their respective metals usually do not equal to unity.
See less