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OALib Journal期刊
ISSN: 2333-9721
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重碳酸盐溶液中SO42-和Cl-对低碳钢活化/钝化腐蚀行为的影响
DOI: 10.3724/SP.J.1037.2011.00134, PP. 1321-1326
Keywords: 低碳钢,活化/钝化,重碳酸盐溶液,SO42-,Cl-
Abstract:
在除O2的0.1mol/LNaHCO3,0.1mol/LNaHCO3+0.1mol/LNa2SO4以及0.1mol/LNaHCO3+0.1mol/LNaCl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0.1mol/LNaHCO3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0.1mol/LNaHCO3+0.1mol/LNa2SO4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0.1mol/LNaHCO3+0.1mol/LNaCl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.
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