Differences in the corrosion inhibition of water extracts of Cassia fistula L. pods and o-phenanthroline on steel in acidic solutions in the presence and absence of chloride ions

Ahmed El NemrEnvironmental Division, National Institute of Oceanography and Fisheries, Kayet Bey, El-Anfoushy, Alexandria, Egypt, Tel. +20 3 4807138, Fax: +20 3 4801174Correspondence[email protected]

Ghada F. El SaidEnvironmental Division, National Institute of Oceanography and Fisheries, Kayet Bey, El-Anfoushy, Alexandria, Egypt, Tel. +20 3 4807138, Fax: +20 3 4801174

Azza KhaledEnvironmental Division, National Institute of Oceanography and Fisheries, Kayet Bey, El-Anfoushy, Alexandria, Egypt, Tel. +20 3 4807138, Fax: +20 3 4801174

Amany El SikailyEnvironmental Division, National Institute of Oceanography and Fisheries, Kayet Bey, El-Anfoushy, Alexandria, Egypt, Tel. +20 3 4807138, Fax: +20 3 4801174

Abeer A. MoneerEnvironmental Division, National Institute of Oceanography and Fisheries, Kayet Bey, El-Anfoushy, Alexandria, Egypt, Tel. +20 3 4807138, Fax: +20 3 4801174

Dalia E. Abd-El-KhalekEnvironmental Division, National Institute of Oceanography and Fisheries, Kayet Bey, El-Anfoushy, Alexandria, Egypt, Tel. +20 3 4807138, Fax: +20 3 4801174

Abstract

The corrosion inhibition of water extract of Cassia fistula L. pods and o-phenanthroline on mild steel in acid solution in the absence and presence of 0.1 M NaCl have been investigated using weight loss measurements in addition to the potentiodynamic polarization technique. FTIR and GC-mass were used to identify the chemical composition of C. fistula L. pods. The inhibition efficiencies of C. fistula L. pods were 95.19% in 2 M H₂SO₄ and 86.13% in 0.5 M nitric acid solutions in the presence of chloride ions, while o-phenanthroline recorded 86.09 and 72.76% for the above acid solutions, respectively. All the ΔG_ads were negative which indicates spontaneous adsorption on the steel surface. Consequently the relationship between log (c/) and log c indicates that the adsorption of inhibitor onto steel surface follows the Langmuir adsorption isotherm.

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Differences in the corrosion inhibition of water extracts of Cassia fistula L. pods and o-phenanthroline on steel in acidic solutions in the presence and absence of chloride ions

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Differences in the corrosion inhibition of water extracts of Cassia fistula L. pods and o-phenanthroline on steel in acidic solutions in the presence and absence of chloride ions

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