AC current perturbation techniques for measurement of corrosion rate. 13;

Lakshminarayanan, V and Rajagopalan, SR (1984) AC current perturbation techniques for measurement of corrosion rate. 13;. Transactions of the SAEST (Society for Advancement of Electrochemical Science and Technology), 19 (1). pp. 15-21.

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The corrosion rate of a metal could be measured by applying a small amplitude sinusoidal AC potential and determining the harmonics present in the resulting current. In this paper, it is demonstrated, that the corrosion rate can also be obtained by current-controlled techniques. The first technique consists in applying a current controlled small amplitude AC singal DELTA I sin omega t, super imposed over DC of sufficient magnitude to keep the system in the Tafel region. The resulting AC and DC potential responses enable the corrosion rate to be determined. In the second method described here, a signal of the form DELTA I 10 ** DELTA **E**. **K**. **s**i**n omega **t is applied to the system through a galvanostat. The resulting sinusoidal AC and DC potential responses are used to determine corrosion rate. Experimental results on the application of these techniques to a system of mild steel in IN sulphuric acid are presented and compared with the results obtained by classical logarithmic polarisation techniques.

Item Type: Article
Uncontrolled Keywords: Electrodes - Corrosion;A C Potential erturbation;Concentration Polarization;Current Controlled13; Techniques;Galvanostatic;Harmonic Component of Current response;Corrosion
Subjects: CHEMISTRY AND MATERIALS > Inorganic, Organic and Physical Chemistry
Depositing User: Ms Indrani V
Date Deposited: 04 Apr 2005
Last Modified: 24 May 2010 04:08

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