The co‐operative effect of chloride ions and some natural extracts in retarding corrosion of steel in neutral media

Abstract

Effect of lupine and damsissa extracts on the corrosion of steel in 0.5 M Na2SO4 solution free from and containing 0.01 or 0.1 M NaCl were examined by potentiodynamic and electrochemical impedance spectroscopy techniques. Potentiodynamic polarization curves measurements indicated that damsissa and lupine extracts behave as anodic type inhibitors. Nyquist impedance plots showed type of distorted semicircle whose size increases with increasing concentrations of lupine or damsissa extract. Increasing chloride ion concentration in the solution led to increase of the inhibition efficiency of the extract and this behaviour was explained on the basis of co‐operative mechanism of adsorption. Kinetic–thermodynamic model was used to clarify the nature of adsorption and showed good fit to the experimental data. The results indicated that lupine extract is more effective as corrosion inhibitor for steel in neutral media containing chloride ions than damsissa extract.

Effect of Alkaline Etching on the Inhibition of the Acidic Corrosion of Aluminum by Lupine Extract

“…Effect of lupine on the corrosion of steel in 0.5 M Na 2 SO 4 solution free from and containing 0.01 or 0.1 M NaCl was examined by potentiodynamic and electrochemical impedance spectroscopy techniques. Potentiodynamic polarization curves measurements indicated that lupine extract behaves as an anodic type inhibitor [14]. Effect of lupine on the corrosion of zinc in neutral, alkaline and acidic media was examined by potentiodynamic and electrochemical impedance spectroscopy techniques.…”

Evaluation of Nicotiana Leaves Extract as Corrosion Inhibitor for Steel in Acidic and Neutral Chloride Solutions

“…The studied plant materials include leaf extracts of Occimum viridis, Telferia occidentalis, Azadirachta indica and Hibiscus sabdariffa, as well as extracts from the seeds of Garcinia kola. The effect of lupine and damsissa extracts on the corrosion of steel in 0.5 M Na 2 SO 4 solution free from and containing 0.01 or 0.1 M NaCl were examined by potentiodynamic and electrochemical impedance spectroscopy techniques [10]. Also, olive leaves extract was studied as scale and corrosion inhibitor for steel surface in brine solution [11].…”

Kappaphycus alvarezii – A marine red alga as a green inhibitor for acid corrosion of mild steel

“…In the recent past, there has been a great improvement in the development of natural corrosion inhibitors . Plant extracts such as Croton cajucara , Bamboo , Artemisia pallens , Dendrocalamus brandisii , Salvia officinalis , lupine and damsissa extracts , etc., were reported as good corrosion inhibitors. In our laboratory itself we have reported that extracts of Solanum nigrum , Rauvolfia serpentina , Solanum tuberosum , Calotropis procera , Piper nigrum , Strychnos nux‐vomica , Datura stramonium , Datura metel , Ervatamia coronaria and extracts of marine algae viz., Caulerpa racemosa , Hydroclathrus clathratus , Spirulina platensis posses excellent corrosion inhibitive effects.…”