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Abstract
A number of methods for the measurement of the corrosion rate of iron have been compared using a natural (unsupported) water and water supported with sodium perchlorate. All the methods gave similar results for the supported electrolytes and demonstrated the efficiency off our commercial corrosion inhibitors.
Unsupported (dilute) electrolyte solutions could not be investigated by the faradaic impedance method using a simple bridge technique. Polarisation data from the dilute solutions gave misleading results due to the high resistance of the solution and the effect of the diffuse double layer.
Sodium perchlorate appears to be a suitable supporting electrolyte for the electrochemical study of iron free from gross films of corrosion product in simple solutions.