Title:Simple Way of Predicting the Corrosion Inhibitors Efficiency of Carbon Steel in Seawater
Volume: 7
Issue: 1
Author(s): Khaled J. Habib*, Weifeng Jiang, Amer N. Al-Arbeed, Aziz B. Rahman and Kenn T. Grattan
Affiliation:
- Materials Science and Photo- Electronics Lab., RE Program, EBRO Center, KISR, P.O. Box 24885, Safat 13109,Kuwait
Keywords:
Corrosion inhibitor, electrical resistivity, carbon steel, numerical modelling, screening method of corrosion inhibitors.
Abstract: Background: A simple criterion for the efficiency evaluation of KGR-134 corrosion inhibitor
of carbon steel samples in seawater solutions has been applied and compared with a numerical model
along with a screening method of the percentage protection efficiency. The criterion, lim (ρins/ρs) =1,
has been applied, when the resistivity of carbon steel sample in inhibited seawater (ρins) becomes equal
to the resistivity of the carbon steel sample in blank seawater (ρs), as a function of the exposure time of
the sample to the inhibited solutions. The criterion was used to determine the efficiency of 5-20 ppm of
KGR-134 corrosion inhibitor in seawater.
The analytical criterion, numerical modelling, and screening method of corrosion inhibitors
were used in the present investigation.
Efficiency variations of the KGR-134 corrosion inhibitor as a function of the inhibitor concentration
and exposure time were calculated by fitting the experimental data to a numerical model incorporating
a nonlinear regression method. The screening method of the percentage protection efficiency of
corrosion inhibitors was found in a good agreement with the analytical criterion.
Conclusions: The analytical criterion a long with numerical modelling were found concise ways of predicting
the corrosion inhibitors efficiency of carbon steel in seawater in a comparison with the classical
way of the screening method of corrosion inhibitors.
