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Title: Applications of exponential relaxation methods for corrosion studies and corrosion rate measurements
Authors: Lakshminarayanan, V.
Rajagopalan, S.R.
Keywords: Corresion rate
Polarisation resistance
Ohmic drop and double layer capacitance
Small amplitude exponential relaxation technique
Large amplitude exponential relaxation technique
Single transient and multi transient
Accelerated tafel plot
Issue Date: Oct-1986
Publisher: Indian Academy of Sciences, Bangalore, India.
Citation: Proceedings of the Indian Academy of Sciences (Chemical Sciences), 1986 Vol. 97, p465-477.
Abstract: Investigations on the use of an exponential relaxation technique for studying corrosion systems are reported. It is shown that the polarisation resistance and the double layer capacitance of corrosion systems can be obtained by the small amplitude exponential relaxation technique (SAERT). It is demonstrated. that the rate of corrosion can be measured by the large amplitude exponential relaxation technique (LAERT). This technique yields 'accelerated Tafel plot' only when the charging current is negligible. which is seldom so. Methods for correcting for double layer charging are described. Double layer capacitance as a function of potential is obtained from LAERT. Therefore it can be used for studies on inhibitors. The utility of LAERT for corrosion systems with only one of the conjugate reactions under activation control is established. The effect of series resistance (R,) is discussed and an in siru method for its determination is described. A procedure for correcting the experimental data for errors due to R, is given.
ISSN: 0253-4134
Copyright: Indian Academy of Sciences, Bangalore, India.
Appears in Collections:Research Papers (SCM)

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