INHIBITION OF MILD-STEEL CORROSION BY SODIUM DODECYL BENZENE SULFONATE AND SODIUM OLEATE IN ACIDIC SOLUTIONS

Inhibition of mild steel corrosion by sodium dodecyl benzene sulfonate ((C12H25C6H4SO3Na [SDBS]) and sodium oleate (CH3[CH2](7)CH=CH[CH2](7) COONa) in acidic solutions was investigated using a potentiostat, a lo ck-in amplifier a contact angle goniometer, a Fourier transform infrar ed (FTIR) spectrometer, and an ultraviolet (UV)/visible spectrophotome ter. In the presence of the organic inhibitors, the corrosion rate was reduced significantly. Anionic SDBS was adsorbed on the positively ch arged mild steel surface through the electrostatic attraction. However , for sodium oleate, the soluble oleic acid (CH3[CH2](7)CH=CH[CH](7)CO OH) chemisorbed on the steel surface at the first stage. Then, insolub le colloid adsorbed on the chemisorbed surface through van der Waals f orces.