ALMEIDA, T. C.; CYSNE, P. M. P. ; SILVA, P. V. G. ; GARCIA, R. F. ; Merlin C. E. Bandeira ; Oscar R. Mattos .
Resumo: The effect of salt concentration was investigated on general CO2 corrosion of X65 carbon steel. The corrosion process was monitored by weight loss and potentiodynamic sweeps for NaCl (0,1;3 and 10)wt% at pH 4, 22°C keeping dissolved CO2concentration constant.Experiments were performed in Na2SO4 solutions maintaining the same ionic strength as brine in order to evaluate the chloride or sulfate influence on corrosion. Experimental results showed different behaviors for carbon steel corrosion in chloride and sulfate environments. The weight loss in NaCl slowed down in concentrations ≥ 3 wt%. The weight loss in Na2SO4 enhanced with increasing salt concentration.That result was supported by an increase incathodic current density when sodium sulfate concentration was increased.
