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在除O_2的0.1 mol/L NaHCO_3,0.1 mol/L NaHCO_3+0.1 mol/L Na_2SO_4以及0.1 mol/L NaHCO_3+0.1 mol/L NaCl溶液中,用恒电位法在低碳钢电极表面制备腐蚀产物,并原位监测低碳钢的开路电位,用SEM观察腐蚀形貌,用XRD确定腐蚀产物的相组成.结果表明.在0.1 mol/L NaHCO_3溶液中,低碳钢的开路电位最终处于再钝化区间,其表面未观察到明显的腐蚀现象;在0.1 mol/L NaHCO_3+0.1 mol/L Na_2SO4溶液中,低碳钢的开路电位最终处于再活化区间,其表面发生均匀腐蚀;在0.1 mol/L NaHCO_3+0.1 mol/L NaCl溶液中,低碳钢的开路电位最终亦处于再活化区间,而其表面却发生局部腐蚀,XRD结果表明,低碳钢表面的腐蚀产物主要为Fe_3O_4和α-FeOOH.
The corrosion products were prepared on the surface of mild steel electrode by potentiostatic method in 0.1 mol / L NaHCO 3, 0.1 mol / L NaHCO 3 + 0.1 mol / L Na 2 SO 4 and 0.1 mol / L NaHCO 3 + 0.1 mol / The open circuit potential of low carbon steel was monitored in situ, the morphology of corrosion was observed by SEM and the phase composition of corrosion products was determined by XRD.The results showed that the open circuit potential of low carbon steel was finally re-passivated in 0.1 mol / L NaHCO 3 solution In the 0.1 mol / L NaHCO 3 + 0.1 mol / L Na 2 SO 4 solution, the open circuit potential of mild steel is finally in the reactivation interval and the surface is uniformly corroded. At 0.1 mol / L In the solution of NaHCO 3 + 0.1 mol / L NaCl, the open circuit potential of mild steel finally reaches the reactivation zone, while the surface corrosion occurs locally. The XRD results show that the corrosion products of low carbon steel are mainly Fe 3 O 4 and α-FeOOH.