Corrosion inhibition of mild steel by plant extract in dilute HCl medium

Abstract The inhibition effect of Zenthoxylum alatum plant extract on the corrosion of mild steel in 5% and 15% aqueous hydrochloric acid solution has been investigated by weight loss and electrochemical impedance spectroscopy (EIS). The corrosion inhibition efficiency increases on increasing plant extract concentration till 2400 ppm. The effect of temperature on the corrosion behaviour of mild steel in 5% and 15% HCl with addition of plant extract was studied in the temperature range 50–80 °C. Surface analysis (SEM, XPS and FT-IR) was also carried out to establish the corrosion inhibitive property of this plant extract in HCl solution. Plant extract is able to reduce the corrosion of steel more effectively in 5% HCl than in 15% HCl. The adsorption of this plant extract on the mild steel surface obeys the Langmuir adsorption isotherm.

[1]  M. Metikoš-huković,et al.  Impedance investigation of corrosion inhibition of armco iron by thiourea , 1996 .

[2]  S. Sánchez,et al.  Inhibitors performance in CO2 corrosion: EIS studies on the interaction between their molecular structure and steel microstructure , 2005 .

[3]  Lin Wang.  Evaluation of 2-mercaptobenzimidazole as corrosion inhibitor for mild steel in phosphoric acid , 2001 .

[4]  V. Moutarlier,et al.  EIS characterisation of anodic films formed on 2024 aluminium alloy, in sulphuric acid containing molybdate or permanganate species , 2005 .

[5]  J. M. Sykes,et al.  Silver Jubilee review 25 years of progress in electrochemical methods , 1990 .

[6]  S. Sánchez,et al.  The influence of steel microstructure on CO2 corrosion. EIS studies on the inhibition efficiency of benzimidazole , 2003 .

[7]  F. Zucchi,et al.  Plant extracts as corrosion inhibitors of mild steel in HCl solutions , 1985 .

[8]  D. Briggs,et al.  Practical surface analysis: By auger and x-ray photoelectron spectroscopy , 1983 .

[9]  T. Pandiyan,et al.  A new inhibitor for mild carbon steel: Electrochemical and DFT studies , 2005 .

[10]  M. Traisnel,et al.  Corrosion inhibition of mild steel by the new class of inhibitors [2,5-bis(n-pyridyl)-1,3,4-thiadiazoles] in acidic media , 2001 .

[11]  G. Gunasekaran,et al.  Eco friendly inhibitor for corrosion inhibition of mild steel in phosphoric acid medium , 2004 .

[12]  M. Traisnel,et al.  3,5-bis(n-Hydroxyphenyl)-4-amino-1,2,4-triazoles and 3,5-bis(n-aminophenyl)-4-amino-1,2,4-triazoles: a new class of corrosion inhibitors for mild steel in 1m HCl medium , 1999 .

[13]  S. M. Mayanna,et al.  Adsorption of n‐Decylamine on Zinc from Acidic Chloride Solution , 1977 .

[14]  R. Jasinski,et al.  FTIR Measurements of Iron Oxides on Low Alloy Steel , 1988 .

[15]  L. I. Antropov.  A correlation between kinetics of corrosion and the mechanism of inhibition by organic compounds , 1967 .

[16]  H. Takenouti,et al.  Use of impedance measurements for the determination of the instant rate of metal corrosion , 1972 .

[17]  R. Coudert,et al.  Some surfactants in the series of 2-(alkyldimethylammonio) alkanol bromides as inhibitors of the corrosion of iron in acid chloride solution , 1995 .

[18]  S. Pitchumani,et al.  Polyamino‐Benzoquinone Polymers: A New Class of Corrosion Inhibitors for Mild Steel , 1995 .

[19]  J. O'm. Bockris,et al.  On the structure of charged interfaces , 1963, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[20]  U. Schwertmann,et al.  The Iron Oxides: Structure, Properties, Reactions, Occurrences and Uses , 2003 .

[21]  M. Traisnel,et al.  Inhibiting effects of 3,5-bis(n-pyridyl)-4-amino-1,2,4-triazoles on the corrosion for mild steel in 1 M HCl medium , 1998 .

[22]  R. D. Levie,et al.  On the impedance of electrodes with rough interfaces , 1989 .

[23]  M. Ajmal,et al.  Influence of substituted benzothiazoles on corrosion in acid solution , 1996 .

[24]  C. Arroyave,et al.  Possible improvements in the action of some rust converters , 2001 .

[25]  M. Traisnel,et al.  The substituted 1,3,4-oxadiazoles: a new class of corrosion inhibitors of mild steel in acidic media , 2000 .

[26]  A. Din,et al.  Corrosion inhibition by naturally occurringsubstances—I. The effect of Hibiscus subdariffa (karkade) extract on the dissolution of Al and Zn , 1972 .

[27]  K. Jüttner,et al.  AC-impedance measurements on aluminium barrier type oxide films , 1983 .

[28]  N. McIntyre,et al.  X-ray photoelectron spectroscopic studies of iron oxides , 1977 .

[29]  C. Hsu,et al.  Technical Note: Concerning the Conversion of the Constant Phase Element Parameter Y0 into a Capacitance , 2001 .