重碳酸盐溶液中SO_4^(2-)和Cl^-对低碳钢活化/钝化腐蚀行为的影响  

EFFECTS OF SO_4~2- AND CI^- ON ACTIVE/PASSIVE CORROSION BEHAVIORS OF LOW CARBON STEEL IN DEAERATED BICARBONATE SOLUTION

作　　者：阳靖峰[1] 董俊华[1] 柯伟[1] 

机构地区：[1]中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

出　　处：《金属学报》2011年第10期1321-1326,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目51071160~~

摘　　要：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 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 NaHC03＋0.1 mol/L NaC1 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 NaHC03＋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.

关 键 词：低碳钢 活化/钝化 重碳酸盐溶液 SO_4^- Cl^- 

分 类 号：TF777.1[冶金工程—钢铁冶金]