Adsorptive studies of the inhibitive properties of ethanolic extracts of Parinari polyandra on Mild steel in acidic media
Keywords:
Corrosion inhibition, mild steel, Parinari polyandra, adsorption, thermodynamicsAbstract
Communication in Physical Sciences 2019, 4(1): 39-47
Authors: F E Awe, M Abdulwahab & H A Otaru
Corrosion inhibition effectiveness of ethanol extracts of Parinari polyandra for mild steel was investigated using gravimetric and polarization methods. The influence of extract concentrations (0.1g/l to 0.5g/l) and temperatures (303K to 323K) on corrosion and corrosion inhibition were assessed. The results obtained showed that the plant extracts decreased the corrosion rate of mild steel in the acid medium. The corrosion rate decreased with increasing extract concentration for mild steel at 303 K. Inhibition efficiency in all the systems decreased with a rise in temperature, suggesting physical adsorption of the extract constituents on the metal surfaces. Linear polarization studies showed that the plant extract suppressed both the anodic and cathodic half reactions of the corrosion processes, thereby acting as mixed-type inhibitors. Langmuir isotherm was found to be the best isotherm that described the adsorption behaviour of the extract on the surfaces of mild steel at room temperature, whereas the adsorption property at elevated temperature was best described by the Freundlich and Temkin adsorption isotherms. Calculated values of free energy of adsorption, ∆????????????????????, on mild steel in the presence of the inhibitor was found to be within the range expected for
physical adsorption mechanism. Corrosion activation energy (Ea) values for mild steel in the acid solutions increased in the presence of the inhibitor and were found to be less than 80 kJmol-1.
Downloads
Published
Issue
Section
Similar Articles
- P. O. Ameh, N. O. Eddy, Theoretical and Experimental Investigations of the Corrosion Inhibition Action of Piliostigma Thonningii Extract on Mild Steel in Acidic Medium , Communication In Physical Sciences: Vol. 3 No. 1 (2018): VOLUME 3 ISSUE 1
- S. Chitra, Adsorption studies on the inhibition of the corrosion of mild steel in 2 M NaCl by tetracycline and neomycin trisulphate drugs , Communication In Physical Sciences: Vol. 5 No. 1 (2020): VOLUME 5 ISSUE 1
- Richard Alexis Ukpe, The Investigation of the Corrosion Inhibition Efficiency of Aqueous extract of Vernomia Amygdalina for Mild Steel In Various Concentrations of HCl , Communication In Physical Sciences: Vol. 10 No. 1 (2023): VOLUME 10 ISSUE 1
- S. A. Odoemelam, Inhibition of Corrosion of Mild Steel in Hydrochloric Acid Solution by two Schiff Bases Derived from Benheric and Linoleic Acids , Communication In Physical Sciences: Vol. 4 No. 2 (2019): VOLUME 4 ISSUE 2
- Richard Alexis Ukpe, Joint Effect of Ethanol Extract of Orange Peel and halides on the Inhibition of the Corrosion of Aluminum in 0.1 M HCl: An approach to Resource Recovery , Communication In Physical Sciences: Vol. 4 No. 1 (2019): VOLUME 4 ISSUE 1
- Ugoetan Victor Agbogo, Rifore Belief Silas, Victor Inioluwa Olaoye, Philip Ifeanyi Jerome, Mathew Joshua, Investigation of the Inhibitive Properties of Bio-Inspired Starch-Polyvinyl Acetate Graft Copolymer (Ps-Pvagc) on the Acid Corrosion of Mild Steel , Communication In Physical Sciences: Vol. 10 No. 2 (2023): VOLUME 10 ISSUE 2
- Nkem B. Iroha, Richard A. Ukpe, Investigation of the Inhibition of the Corrosion of carbon steel in Solution of HCl by Glimepiride , Communication In Physical Sciences: Vol. 5 No. 3 (2020): VOLUME 5 ISSUE 3
- Attah Chuks Emmanuel, Gloria Chika Udeokpote, Ethanol Extract of Vernonia amygdalina Leaf as a Green Corrosion Inhibitor for Carbon Steel in Solution of HCl , Communication In Physical Sciences: Vol. 10 No. 3 (2023): VOLUME 10 ISSUE 3
- Patricia Ese Umoru, Femi Emmanuel Awe, Joseph Ifeanyi Uche, Oluwayemi Abiodun Babatunde, Ibrahim Aliyu Salaha, Investigation of the Adsorptive And Inhibitive Properties Of Cucurbita Maxima Peel Extract And Halide Ions As Inhibitors For Stainless Steel in 1m H2so4 Solution , Communication In Physical Sciences: Vol. 10 No. 2 (2023): VOLUME 10 ISSUE 2
- Iniofon Udom, Grace Cookery, Paul Ocheje Ameh, Investigation of Acanthus montanus Leaves Extract as Corrosion Inhibitor for Copper in 2 M Sulphuric Acid , Communication In Physical Sciences: Vol. 12 No. 3 (2025): VOLUME 12 ISSUE 3
You may also start an advanced similarity search for this article.