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Naturally Occuring Organic Substances as Corrosion Inhibitors for mild steel in acid medium
Author(s) -
Rahim M. A. Abdel,
Hassan Hanaa B.,
Khalil M. W.
Publication year - 1997
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19970280212
Subject(s) - tafel equation , corrosion , amino acid , adsorption , metal , chemistry , polarization (electrochemistry) , sulfur , corrosion inhibitor , inorganic chemistry , organic chemistry , electrochemistry , biochemistry , electrode
Inhibition of the corrosion of mild steel in H 2 SO 4 by amino acids was studied by measuring the Tafel polarization curves. Nineteen different naturally occuring amino acids were used as corrosion inhibitors. Two‐site adsorption model was proposed to explain the adsorption of some amino acids on the metal surface. At 1 × 10 −4 M concentration of inhibitor, the best corrosion inhibition was obtained with the sulphur‐containing amino acids. Other amino acids gave various corrosion inhibition efficiency depending or their structure.