Study of Synergistic Effect of Iodide on the Corrosion Antagonistic Behaviour of a Heterocyclic Phenylhydrazone in Sulphuric Acid Medium on Carbon Steel. (3rd December 2013)

• Record Type: Journal Article
• Authors: Raphael, Vinod P.; Kakkassery, Joby Thomas; Shanmughan, Shaju K.; Paul, Aby
• Other Names: Allahar K. N. Academic Editor.; Bereket G. Academic Editor.; Obot I. Academic Editor.; Salghi R. Academic Editor.
• Is Part Of: ISRN corrosion. Volume 2013(2013)
• Publication Date: 2013-12-03
• Subjects: Corrosion and anti-corrosives -- Periodicals; Materials -- Corrosion -- Periodicals; Corrosion and anti-corrosives; Materials -- Corrosion; Electronic journals; Periodicals; 620.11223
• DOI: 10.1155/2013/390823
• Languages: English
• ISSNs: 2090-8903

Abstract

Abstract : Synergistic effect of KI on the corrosion inhibition efficiency of 3-acetylpyridine phenylhydrazone (3APPH) on carbon steel (CS) in 0.5 M sulphuric acid solution has been investigated using gravimetric studies, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization studies. Gravimetric corrosion studies revealed that 3APPH showed moderate corrosion inhibition efficiency up to 8 h and beyond this period it showed corrosion accelerating behavior. This antagonistic effect of 3APPH is due to the hydrolysis of the molecule in acidic medium. A very high percentage of inhibition efficiency at 24 h was obtained on the addition of KI due to the synergistic effect of iodide ions. The adsorption of 3APPH and 3APPH + KI on the surfaces of the corroding metal obey Langmuir isotherm as obtained by impedance measurements. Polarization studies revealed that 3APPH act as a mixed type inhibitor. Thermodynamic parameters ( K a d s, Δ G a d s 0 ) were derived from the adsorption isotherms. Surface morphology of the corroding metal was investigated by SEM analysis.