Corrosion Inhibition of Mild Steel in Acid Solution by 3,4,5-Trimethoxyphenyl-2-imidazolines | Zendy

D. Nalini | Zendy; R. Rajalakshmi | Zendy; S. Subhashini | Zendy

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Corrosion Inhibition of Mild Steel in Acid Solution by 3,4,5-Trimethoxyphenyl-2-imidazolines

Author(s) -

D. Nalini,

R. Rajalakshmi,

S. Subhashini

Publication year - 2010

Publication title -

journal of chemistry

Language(s) - English

Resource type - Journals

eISSN - 2090-9063

pISSN - 2090-9071

DOI - 10.1155/2011/439234

Subject(s) - chemistry , tafel equation , corrosion , adsorption , electrochemistry , langmuir adsorption model , cathodic protection , polarization (electrochemistry) , imidazoline receptor , anode , corrosion inhibitor , nuclear chemistry , inorganic chemistry , organic chemistry , electrode , medicine

A heterocyclic imidazoline, 3,4,5-trimethoxyphenyl-2-imidazolines (TMP2I) was tested for its corrosion inhibition in 0.5 M H2SO4 and 1 M HCl using weight loss, Tafel polarisation and electrochemical impedance techniques. The results show that the inhibition efficiency increases with the increase in concentration of TMP2I and the higher efficiency of about 98% is obtained in both the acid media at 20 ppm. The adsorption of TMP2I obeys Langmuir adsorption isotherm and occurs spontaneously. Cathodic and anodic polarization curves of mild steel in the presence of different concentrations of TMP2I at 30 0C reveal that it is a mixed type of inhibitor. Electrochemical impedance studies reveal that the system follows mixed mode of inhibition. The surface morphology of the mild steel specimens was evaluated using SEM image

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