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Naturally Occurring Organic Substances As Corrosion Inhibitors For Mild Steel In Acid Medium: Concentration And Temperature Effects

M. A. Rahim, H. Hassan, M. Khalil
Published 1997 · Chemistry

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Potentiodynamic cathodic and anodic polarization technique was used to study the effect of some common amino acids concentration on the corrosion inhibition of mild steel in H 2 SO 4 . A value of 1.0 x 10 -4 M represents a critical concentration, for the aliphatic amino acids, above which the corrosion rate increases. The increase of the sulphur-containing amino acids concentration largely decreases the corrosion rate. A mono-layer adsorption of the amino acid molecules on the metal surface was proposed with the adsorption behaviour following the Temkin isotherm at 30°C. The effect of temperature on the corrosion inhibition of amino acids was also studied over the temperature range 25 to 60 °C. Values of the apparent activation energy in the range of 42-49 kJ mol -1 were estimated for the steel corrosion in the inhibited acid solutions.
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