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Passive behaviour of alloy corrosion-resistant steel Cr10Mo1 in simulating concrete pore solutions with different pH

机译：Cr10Mo1合金耐蚀钢在模拟不同pH值的混凝土孔隙溶液中的被动行为

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摘要

The passive behaviour of new alloy corrosion-resistant steel Cr10Mo1 and plain carbon steel (as a comparison) in simulating concrete pore solutions of different pH (ranging from 13.5 to 9.0) under open circuit potential conditions, was evaluated by various electrochemical techniques: potentiodynamic polarization, capacitance measurements and electrochemical impedance spectroscopy. The chemical composition and structure of passive films were investigated by X-ray photoelectron spectroscopy (XPS) and secondary ion mass spectroscopy (SIMS). The electrochemical responses of passive films show that Cr10Mo1 steel has an increasing passivity with pH decreasing while carbon steel dose conversely, revealing carbonation does no negative effect on passivation of the corrosion-resistant steel. SIMS reveals that the passive film on the corrosion-resistant steel presents a bilayer structure: an outer layer mainly consisting of Fe oxides and hydroxides, and an inner layer enriched in Cr species, while only a Fe-concentrated layer for carbon steel. According to the XPS analysis results, as the pH decreases, more stable and protective Cr oxides are enriched in the film on Cr10Mo1 steel while Fe oxides gradually decompose. Higher content of Cr oxides in the film layer provides Cr10Mo1 corrosion-resistant steel more excellent passivity at lower pH. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过各种电化学技术评估了新型合金耐腐蚀钢Cr10Mo1和普通碳素钢（作为比较）在不同pH（范围从13.5到9.0）的混凝土孔隙溶液中在开路电势条件下的被动行为：电位极化，电容测量和电化学阻抗谱。通过X射线光电子能谱（XPS）和二次离子质谱（SIMS）研究了钝化膜的化学成分和结构。钝化膜的电化学响应表明Cr10Mo1钢的钝化度随pH的降低而增加，而碳钢的剂量相反，表明碳化对耐蚀钢的钝化没有负面影响。 SIMS揭示，耐腐蚀钢上的钝化膜呈现双层结构：主要由Fe氧化物和氢氧化物组成的外层，以及富含Cr物种的内层，而对于碳钢则只有Fe富集层。根据XPS分析结果，随着pH值的降低，Cr10Mo1钢上的膜中会富含更稳定和保护性的Cr氧化物，而Fe氧化物则逐渐分解。膜层中较高的Cr氧化物含量使Cr10Mo1耐腐蚀钢在较低的pH值下具有更好的钝化性。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2016年第15期|1126-1136|共11页
  • 作者

    Ai Zhiyong; Jiang Jinyang; Sun Wei; Song Dan; Ma Han; Zhang Jianchun; Wang Danqian;

  • 作者单位

    Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China|Jiangsu Key Lab Construct Mat, Nanjing 211189, Jiangsu, Peoples R China;

    Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China|Jiangsu Key Lab Construct Mat, Nanjing 211189, Jiangsu, Peoples R China;

    Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China|Jiangsu Key Lab Construct Mat, Nanjing 211189, Jiangsu, Peoples R China;

    Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China|Jiangsu Key Lab Construct Mat, Nanjing 211189, Jiangsu, Peoples R China|Hohai Univ, Coll Mech & Mat, Nanjing 210098, Jiangsu, Peoples R China;

    Res Inst Jiangsu Shasteel Iron & Steel, Zhangjiagang 215625, Jiangsu, Peoples R China;

    Res Inst Jiangsu Shasteel Iron & Steel, Zhangjiagang 215625, Jiangsu, Peoples R China;

    Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China|Jiangsu Key Lab Construct Mat, Nanjing 211189, Jiangsu, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Corrosion-resistant steel; Passive behaviour; Film composition; pH;

    机译：耐腐蚀钢;钝化行为;膜成分;pH;

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