耐海水腐蚀钢筋00Cr10MoV在模拟混凝土孔隙液中钝化膜的研究

doi:10.11902/1005.4537.2015.182

中国腐蚀与防护学报

2016, Vol. 36

Issue (5): 441-449 DOI: 10.11902/1005.4537.2015.182

本期目录 | 过刊浏览

耐海水腐蚀钢筋00Cr10MoV在模拟混凝土孔隙液中钝化膜的研究

张建春¹(

),蒋金洋²,李阳¹,施锦杰²,左龙飞¹,王丹芊²,麻晗¹

1. 江苏省 (沙钢) 钢铁研究院张家港 215625
2. 东南大学材料科学与工程学院南京 211189

Passive Films Formed on Seawater Corrosion Resistant Rebar 00Cr10MoV in Simulated Concrete Pore Solutions

Jianchun ZHANG¹(

),Jingyang JIANG²,Yang LI¹,Jinjie SHI²,Longfei ZUO¹,Danqian WANG²,Han MA¹

1. Institute of Research of Iron & Steel, Shasteel, Zhangjiagang 215625, China
2. School of Material Science and Engineering, Southeast University, Nanjing 211189, China

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摘要:

选取耐海水腐蚀钢筋00Cr10MoV为实验材料,采用X射线光电子能谱 (XPS)、电化学阻抗谱 (EIS) 和极化曲线等测试方法,研究了其在模拟混凝土孔隙液中钝化膜的组成和电化学行为,以及Cl^-对其钝化膜的影响。结果表明,00Cr10MoV试样在该条件下的钝化膜组成主要为FeO,Cr₂O₃,γ-FeOOH和CrOOH;Cl^-的存在对钝化膜形成有阻碍作用,且使试样的点蚀电位和电荷转移电阻有所下降,但对维钝电流密度影响不大;试样钝化240 h后形成的钝化膜耐Cl^-侵蚀能力较强,当Cl^-浓度达到5 mol/L时,电荷转移电阻仍维持在较大值,约为2.755×10⁶ Ωcm²,其耐Cl^-侵蚀能力明显优于20MnSiV钢。

关键词 ：耐海水腐蚀钢筋, 模拟混凝土孔隙液, 钝化膜, 电化学阻抗谱, 电荷转移电阻

Abstract：

The electrochemical corrosion behavior of the seawater corrosion resistant rebar steel 00Cr10MoV and the formed passive films on this rebar in simulated concrete pore solutions were examined by means of electrochemical impedance spectroscopy (EIS), polarization curves and X-ray photoelectron spectroscopy (XPS). While the effect of Cl^- in solutions on the formation of passive films was also investigated. The results show that passive films formed on the 00Cr10MoV steel in simulated concrete pore solutions were composed of FeO, Cr₂O₃, γ-FeOOH and CrOOH. The Cl^- prevented the formation of passive films on the steel, and thereby resulted in decrease of pitting potential and charge-transfer resistance, but in little impact on the passive current density. The passive films formed on the steel after immersion in artificial solutions for 240 h exhibited excellent corrosion resistance to Cl^- solutions, which could maintain a large charge-transfer resistance of 2.755×10⁶ Ωcm² in solutions with Cl^- concentration as high as 5 mol/L. In general, the 00Cr10MoV steel exhibited resistance to Cl^- attack superior to 20MnSiV steel.

Key words： seawater corrosion resistant rebar simulated concrete pore solution passive film electrochemical impedance spectroscopy charge-transfer resistance

基金资助:江苏省产学研联合创新资金―前瞻性联合研究项目（BY2013091）资助

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引用本文:

张建春,蒋金洋,李阳,施锦杰,左龙飞,王丹芊,麻晗. 耐海水腐蚀钢筋00Cr10MoV在模拟混凝土孔隙液中钝化膜的研究[J]. 中国腐蚀与防护学报, 2016, 36(5): 441-449.
Jianchun ZHANG, Jingyang JIANG, Yang LI, Jinjie SHI, Longfei ZUO, Danqian WANG, Han MA. Passive Films Formed on Seawater Corrosion Resistant Rebar 00Cr10MoV in Simulated Concrete Pore Solutions. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 441-449.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.182 或 https://www.jcscp.org/CN/Y2016/V36/I5/441

表1 实验钢的化学成分

图1 试样在不含Cl-的模拟混凝土孔隙液中浸泡240 h后钝化膜成分的XPS结果

图2 00Cr10MoV试样在不含Cl-的模拟混凝土孔隙液中浸泡240 h后钝化膜中Fe和Cr的XPS结果

图3 00Cr10MoV试样在两种溶液中浸泡240 h后钝化膜中元素组成随溅射深度的分布

图4 20MnSiV试样在不含Cl-的模拟混凝土孔隙液中浸泡240 h后钝化膜中Fe和Cr的XPS结果

图5 试样在两种溶液中浸泡0.5 h后的极化曲线

图6 试样在两种溶液中浸泡0.5 h后的阻抗图及其拟合结果

图7 等效模拟电路

表2 电化学阻抗谱拟合结果

图8 不同Cl-浓度下试样的腐蚀电位变化曲线

图9 不同Cl-浓度下试样的电化学阻抗谱及其拟合结果

图10 不同Cl-浓度下试样的Rt变化曲线

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