带轧皮预锈钢筋在混凝土养护期间的自然钝化行为研究

doi:10.11902/1005.4537.2023.241

中国腐蚀与防护学报

2024, Vol. 44

Issue (2): 505-511 CSTR: 32134.14.1005.4537.2023.241 DOI: 10.11902/1005.4537.2023.241

研究报告

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带轧皮预锈钢筋在混凝土养护期间的自然钝化行为研究

刘国强¹(

), 张东方¹^,²^,³(

), 陈昊翔¹, 范志宏¹^,²^,³

^1.中交四航工程研究院有限公司水工构造物耐久性技术交通运输行业重点实验室广州 510230
^2.南方海洋科学与工程广东省实验室(珠海) 珠海 519080
^3.广东港珠澳大桥材料腐蚀与工程安全国家野外科学观测研究站珠海 519060

Natural Passivation Behavior of Pre-rusted Steel Rebar with Mill Scale in Curing Stage of Concrete

LIU Guoqiang¹(

), ZHANG Dongfang¹^,²^,³(

), CHEN Haoxiang¹, FAN Zhihong¹^,²^,³

^1.Key Laboratory of Harbor & Marine Structure Durability Technology, Ministry of Transport, CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China
^2.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China
^3.National Observation and Research Station of Material Corrosion and Structural Safety of Hong Kong-Zhuhai-Macao Bridge in Guangdong, Zhuhai 519060, China

引用本文:

刘国强, 张东方, 陈昊翔, 范志宏. 带轧皮预锈钢筋在混凝土养护期间的自然钝化行为研究[J]. 中国腐蚀与防护学报, 2024, 44(2): 505-511.
Guoqiang LIU, Dongfang ZHANG, Haoxiang CHEN, Zhihong FAN. Natural Passivation Behavior of Pre-rusted Steel Rebar with Mill Scale in Curing Stage of Concrete[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 505-511.

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摘要:

以自然暴露3个月的带轧皮HRB400钢筋为研究对象，并与未暴露钢筋进行对比，采用开路电位测试、电化学阻抗谱测试研究了生锈钢筋和正常钢筋表面性能随浸泡时间的变化特征，并采用动电位极化曲线测试、Mott-Schottky曲线测试研究了2种钢筋的可钝化性、表面耐蚀性能与半导体行为，此外通过XPS分析了2种钢筋浸泡10 d后的组成成分。结果表明，2种钢筋均能在混凝土孔隙模拟液中完成钝化，5 d内表面均达到稳定，生锈钢筋的钝化效果、耐蚀性能均比正常钢筋略差，2种钢筋钝化前后的表面成分变化主要表现为Fe(Ⅱ)氧化物的明显降低和Fe(Ⅲ)氧化物、羟基氧化物的显著升高，正常钢筋比生锈钢筋钝化效果和耐蚀性能优异的原因是钝化后具有较低的Fe(Ⅱ)氧化物含量和较高的Fe(Ⅲ)化合物含量。

关键词 ：氧化皮, 预锈钢筋, 混凝土孔隙模拟液, 钝化行为

Abstract：

A mill scale may form on the steel surface during hot rolling process, which exhibits a certain degree of anti-corrosion effect. When a large number of steel bars are used in a construction project, most of them may be naturally exposed to atmosphere for a long time, and thus the mill scale will turn into a loose and porous yellow-brown rust scale due to atmospheric corrosion. In order to understand the nature of the passivation behavior of pre-corroded steel rebars with mill scale during the concrete curing process, the electrochemical behavior of HRB400 rebars with mill scale before (bare bar) and after being atmospherically pre-corroded for 3 months (pre-corroded bar) was comparatively assessed in simulated concrete pore solution by means of open-circuit potential measurement, electrochemical impedance spectroscopy, dynamic potential polarization curve, Mott-Schottky curve and XPS. The results show that the type of rebars can be completely passivated in the simulated concrete pore solution, whilst their surface all reached stability within 5 d. But the passivation effect and corrosion resistance of pre-corroded rebars are slightly worse than those of the bare rebars. The changes in surface composition of the two kind rebars before and after passivation are mainly due to the significant decrease in Fe(II) oxides, while significant increase in Fe(III) oxides and hydroxyl oxides, and the excellent passivation effect and corrosion resistance of the bare rebars compared with the pre-corroded rebars are due to the lower Fe(II) oxide content and higher Fe(III) compound content after passivation.

Key words： mill scale pre-rusted rebar concrete pore solution passivation behavior

收稿日期: 2023-08-05 32134.14.1005.4537.2023.241

ZTFLH:

TG174.1

基金资助:国家重点研发计划(2019YFB1600700)

通讯作者: 刘国强，E-mail: liuguoqiang020@163.com，研究方向为材料腐蚀与防护、海洋钢筋混凝土结构耐久性;
张东方，E-mail: zhangdf8@mail.sysu.edu.cn，研究方向为材料腐蚀与防护、海洋钢筋混凝土结构耐久性

Corresponding author: ZHANG Dongfang, E-mail: zhangdf8@mail.sysu.edu.cn

作者简介: 刘国强，男，1997年生，硕士，助理工程师

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图1 生锈钢筋(左)和正常钢筋(右)宏观形貌图

图2 2种钢筋在混凝土孔隙模拟液中的OCP随时间变化图

图3 2种钢筋在混凝土孔隙模拟液中浸泡不同时间的EIS

图4 拟合所采用的等效电路图

图5 2种钢筋Rt随浸泡时间变化图

图6 2种钢筋在混凝土孔隙模拟液中浸泡10 d后的动电位极化曲线图

表1 2种钢筋动电位极化曲线拟合结果

图7 2种钢筋在混凝土孔隙模拟液中浸泡10 d后的Mott-Schottky曲线

图8 生锈钢筋和正常钢筋钝化前后表面Fe 2p3/2的XPS精细谱及拟合结果

图9 2种钢筋钝化前后表面成分中4种铁产物的相对含量

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