Corrosion Inhibition of Sodium Dodecyl Benzene Sulfonate to Stainless Steel

The corrosion inhibition performance of sodium dodecyl benzene sulfonate (SDBS) to stainless steel in simulated cooling water containing sulfide and chloride ions was investigated by electrochemical impedance spectroscopy, polarization curves and Mott-Schottky approach. The results revealed that in simulated cooling water containing sulfide, the existence of SDBS enlarged the impedance values and raised the pitting potential of stainless steel electrode and decreased the carrier concentration of the passive film, indicating effective corrosion inhibition of SDBS to stainless steel in sulfide containing solution. The pitting potential of stainless steel electrode decreased with the increase of chloride ions in simulated cooling water whereas it shifted towards positive direction after adding SDBS, and evern reached transpasssivation potential, illustrating that corrosion of chlorideions to stainless steel was restrained by adding SDBS in simulated cooling water.