Acid corrosion inhibitor

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Mild Steel Corrosion Inhibition by Various Plant Extracts in 0.5 M Sulphuric acid

Journal Title, Volume, Page: 
Int. J. Electrochem. Sci., 8 (2013) 2635 - 2655
Year of Publication: 
2013
Authors: 
N S Patel
Department of Applied Chemistry, S V National Institute of Technology, Surat-395007, Gujarat, India
S Jauhariand
Department of Applied Chemistry, S V National Institute of Technology, Surat-395007, Gujarat, India
G N Mehta
Department of Applied Chemistry, S V National Institute of Technology, Surat-395007, Gujarat, India
S. S. Al-Deyab
Petrochemical Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
I. Warad
Petrochemical Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
B. Hammouti
LCAE-URAC18, Faculté des Sciences, Université Mohammed 1er, Oujda, Morocco
Preferred Abstract (Original): 
Extract of various plants (Wrightiatinctoria, Clerodendrumphlomidis, Ipomoeatriloba) leaves was investigated as corrosion inhibitor of mild steel in 0.5M H2SO4 using conventional weight loss, electrochemical polarization, electrochemical impedance spectroscopy and scanning electron microscopic studies. The weight loss results showed that all the plant extracts are excellent corrosion inhibitors, electrochemical polarization data revealed the mixed mode of inhibition and the results of electrochemical impedance spectroscopy have shown that the change in the impedance parameters, charge transfer resistance and double layer capacitance, with the change in concentration of the extract is due to the adsorption of active molecules leading to the formation of a protective layer on the surface of mild steel. Scanning electron microscopic studies provided the confirmatory evidence of improved surface condition, due to the adsorption, for the corrosion protection.
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