Applications of exponential relaxation methods for corrosion studies and corrosion rate measurement

Lakshminarayanan, V. ; Rajagopalan, S. R. (1986) Applications of exponential relaxation methods for corrosion studies and corrosion rate measurement Proceedings of the Indian Academy of Sciences - Chemical Sciences, 97 (3-4). pp. 465-477. ISSN 0253-4134

[img]
Preview
PDF - Publisher Version
482kB

Official URL: http://www.ias.ac.in/j_archive/chemsci/97/5/465-47...

Related URL: http://dx.doi.org/10.1007/BF02849206

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 (Re) is discussed and an in situ method for its determination is described. A procedure for correcting the experimental data for errors due to Re is given.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Corrosion 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
ID Code:38385
Deposited On:29 Jun 2011 13:02
Last Modified:17 May 2016 21:16

Repository Staff Only: item control page