论文部分内容阅读
[ Manuscript received October 8, 2003, in revised form March 2, 2004]Corrosion behaviors of X70 steel were studied by means of electrochemical experiments and morphology observation. First, through potentiodynamic polarization in solution of various Cl- ions concentration, it was found that Epit began to appear in solution of Cl- concentration above 0.1 mol/L, and there was a critical point of Cl- concentration between 0.05 mol/L and 0.1 mol/L, below which the extent of pitting and general corrosion were trivial, while in solution of Cl- concentration above 0.1 mol/L, general and pitting corrosion became greater as the increasing of Cl- concentration. All of them were confirmed by the SEM observations after anodic polarization. Second, via the potentiodynamic polarization curves of X70 steel in 0.5 mol/L Cl- solution with 0, 0.05, 0.5 and 1 mol/L SO42-ions, it was found SO42- ions were able to inhibit corrosion aroused from Cl- ions, accordingly a model was set up to describe the process. In addition, to
[Manuscript received October 8, 2003, in revised form March 2, 2004] Corrosion behaviors of X70 steel were studied by means of electrochemical experiments and morphology observation. First, through potentiodynamic polarization in solution of various Cl- ions concentration, it was found that Epit began to appear in solution of Cl-concentration above 0.1 mol / L, and there was a critical point of Cl- concentration between 0.05 mol / L and 0.1 mol / L, below which the extent of pitting and general corrosion were trivial, while in solution of Cl-concentration above 0.1 mol / L, general and pitting corrosion became greater as the increasing of Cl- concentration. All of them were confirmed by the SEM observations after anodic polarization. Second, via the potentiodynamic polarization curves of X70 steel in 0.5 mol / L Cl-solution with 0, 0.05, 0.5 and 1 mol / L SO42-ions, it was found that SO42- ions were able to inhibit corrosion aroused from Cl- ions, accordingly a model was set up to describe the proce ss. In addition, to