Concerning the Efficiency of Corrosion Inhibitors as Given by SVET

 

 

A. C. Bastos,* M. L. Zheludkevich, M. G. S. Ferreira

 

DECV/CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal

 

Received 21^st May 2007; accepted 17^th August 2007

 

 

Abstract

The possibility of obtaining corrosion inhibition efficiency from the Scanning Vibrating Electrode Technique (SVET) is investigated. Results are compared with those obtained by Electrochemical Impedance Spectroscopy (EIS) for the inhibition of iron and zinc with cerium nitrate and 1H-benzotriazole. Examples of good and bad estimations are given and an interpretation for the discrepancies observed is advanced. Large deviations occur when corrosion products are formed since this leads to an underestimation of the currents measured by SVET. Visual inspection of the samples may identify the cases more susceptible to deviation. The approach discussed here can be used to obtain more quantitative information from SVET measurements but should not replace the traditional ways used to determine the inhibition efficiency.

Keywords: SVET, EIS, corrosion, inhibitor efficiency.

 

 

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* Corresponding author. E-mail address: acbastos@cv.ua.pt