Inhibition of mild steel corrosion by sodium dodecyl benzene sulfonate ((C12H25C6H4SO3Na [SDBS]) and sodium oleate (CH3[CH2]7CH=CH[CH2]7COONa) in acidic solutions was investigated using a potentiostat, a lock-in amplifier, a contact angle goniometer, a Fourier transform infrared (FTIR) spectrometer, and an ultraviolet (UV)/visible spectrophotometer. In the presence of the organic inhibitors, the corrosion rate was reduced significantly. Anionic SDBS was adsorbed on the positively charged mild steel surface through the electrostatic attraction. However, for sodium oleate, the soluble oleic acid (CH3[CH2]7CH=CH[CH]7COOH) chemisorbed on the steel surface at the first stage. Then, insoluble colloid adsorbed on the chemisorbed surface through van der Waals forces.

Subject
Acids, Steel surfaces, Water, Sulfonates, Adsorption, Iron, Acidity, Fourier transform infrared spectrography, Solutions, Sodium, Corrosion inhibitors, Powders, Steel
Keywords:
acidic solutions, adsorption, contact angle, corrosion rate, Fourier transform infrared spectroscopy, inhibition, mild steel, sodium oleate, steel, sulfonate
NACE International
1998
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