Figure 11

SEM micrographs for API X120 steel surface after immersion for 6 hr. In (A) 3.5 wt% NaCl solution, (B) CO₂ saturated brine solution (C) 3.5 wt% NaCl with 100 µmol L⁻¹ PEI solution and (D) CO₂ saturated brine solution with 100 µmol L⁻¹ PEI at 20 ^oC.