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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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模拟混凝土孔隙液中钢筋表面膜组成与腐蚀行为的关联
DOI: 10.3724/SP.J.1037.2011.00057, PP. 735-742
Keywords: 钢筋,模拟混凝土孔隙液,极化曲线,Cl-
Abstract:
采用XPS分析钢筋经模拟混凝土孔隙液浸泡后表面膜的化学组成,结合线性极化法和动电位扫描阳极极化曲线测试,研究钢筋在模拟混凝土孔隙液中表面膜化学组成与腐蚀电化学行为的关联.结果表明钢筋在纯模拟液中处于钝化状态.在含Cl-和不同pH值的模拟混凝土孔隙液中,随着Cl-浓度的增加和pH值的降低,钢筋的腐蚀电位负移,电流密度增大;钢筋表面钝化膜Fe2+的含量增加,Fe3+的含量减少.当模拟液中外加Cl-浓度达0.6mol/L或pH值降至11.31时,钢筋表面不发生钝化,但加入0.24mol/LNaNO2缓蚀剂后又可使钢筋钝化从而抑制腐蚀.
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