Determination of linear tafel region from piecewise linear regression analysis

Mohamed Noor, Noraini and Othman, Raihan and Mohd Hatta, Maziati Akmal and Ani, Mohd Hanafi (2014) Determination of linear tafel region from piecewise linear regression analysis. International Journal of Electroactive Materials, 2. pp. 22-27. ISSN 2289-179X

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Abstract

Tafel polarisation method is widely used in corrosion studies but relies heavily on the accurate extrapolation of the linear regions. To eliminate the ambiguity in the linear extrapolation, the present study develops a quantitative method based on piecewise linear regression analysis. In this method, the entire polarisation data is divided into small sub-intervals and variation in the regression coefficient and linearity coefficient values are observed. Consistency in these values serves as a quantitative indicator of the linear Tafel regions. The method described is then demonstrated in potentiodynamic polarisation measurement of Al/NaCl (0.5 M) and Zn/KOH (1 M) systems. The piecewise linear regression analysis positively identified the linear regions from the polarisation branches and thus provided more accurate corrosion parameters of the systems.

Item Type:	Article (Journal)
Additional Information:	2593/37831
Uncontrolled Keywords:	Tafel Linear Region; Regression Analysis; Tafel Equation Constants; Zinc; Aluminium
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA329 Engineering mathematics. Engineering analysis T Technology > TP Chemical technology > TP250 Industrial electrochemistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Science
Depositing User:	Raihan Othman
Date Deposited:	20 Aug 2014 11:00
Last Modified:	19 Jul 2018 09:20
URI:	http://irep.iium.edu.my/id/eprint/37831

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