在除O2的0.1 mol/L NaHCO3, 0.1 mol/L NaHCO3+0.1 mol/LNa2SO4以及0.1 mol/L NaHCO3+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 NaHCO3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 NaHCO3+0.1 mol/L Na2SO4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 NaHCO3+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 Fe3O4和α-FeOOH.
The corrosion behaviors of low carbon steel, a kind of materials used in making metal container sealing high–level radioactive waste, in three deaerated bicarbonate solutions simulated the ground water, 0.1 mol/L NaHCO3 solution, 0.1 mol/L NaHCO3+0.1 mol/L Na2SO4 solution and 0.1 mol/L NaHCO3+0.1 mol/L NaCl solution, were examined. The results in potential evolution revealed that the low carbon steel moved up to the passive state in 0.1 mol/L NaHCO3 solution while moved up to the re–active state in the other solutions. SEM observations showed that the low carbon steel was not corroded in 0.1 mol/L NaHCO3 solution, while homogeneous corrosion occurred in 0.1 mol/L NaHCO3+0.1 mol/L Na2SO4 solution and local corrosion in the third solution. XRD analyses illustrated that the corrosion products are composed of Fe3O4 and α–FeOOH.
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