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Corrosion of steel pipes, tubing, and casings in th e oilfield by acidizing fluids is a major cause of materials failure. Corrosion of X80 steel in hydrochloric acid, a typical acidizing solution, was probed using gravimetric an d electrochemical techniques. Fluvoxamine (FLU) was used as anticorrosive additiv e to the acid, and monitored between 30 C to 90 C. FLU offered efficient protection for the X80 ste el by inhibition. The inhibitive effect increased with a higher FLU c on entration, but decreased as temperature increased. The highest concentration of FLU (10x10 M) afforded inhibition efficiency of 93.5% and 80.4% in 1 M and 15% HCl, respectively, at 30 C. The efficiency decreased to 88.5% and 73.3%, respec tively, at 90 C. Inhibition efficiency was improved by blending FLU with glutat hione, polyethyleneglycol and potassium iodide. Adsorption and thermodynamic stud ies reveal that the inhibitor functions, by spontaneous exothermic adsorption on X80 surface, were best described by Langmuir adsorption model. Impedance measurement reveals increase in charge transfer resistance with decrease in double layer c apa itance. Polarization studies show that FLU acts as a mixed type inhibitor. Scanned mi crographs of X80 surface show a lower pitting in the presence of FLU than in the fr ee acid, demonstrating the effectiveness of FLU as X80 steel corrosion inhibit or.

Electrochemical, Adsorption and Anticorrosion Study on Fluvoxamine and its Blends for X80 Steel Protection in Well Acidizing Fluids