耐蚀钢筋在模拟混凝土孔隙液环境及海砂混凝土中钢筋在模拟海水环境中的钝化及腐蚀行为

doi:10.11902/1005.4537.2023.360

中国腐蚀与防护学报

2024, Vol. 44

Issue (6): 1454-1464 CSTR: 32134.14.1005.4537.2023.360 DOI: 10.11902/1005.4537.2023.360

研究报告

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耐蚀钢筋在模拟混凝土孔隙液环境及海砂混凝土中钢筋在模拟海水环境中的钝化及腐蚀行为

谢文珍¹^,², 王震宇²(

), 韩恩厚²(

)

1.广州大学化学化工学院广州 510000
2.广东腐蚀科学与技术创新研究院广州 510000

Passivation Behavior of Corrosion Resistant Rebar Steels as Bare Steels in a Simulated Concrete Pore Fluid and as Rebar Steels Embedded in Concrete Made of Cement and Sea-sand in a Simulated Seawater

XIE Wenzhen¹^,², WANG Zhenyu²(

), HAN En-Hou²(

)

1. School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510000, China
2. Guangdong Institute of Corrosion Science and Technology Innovation, Guangzhou 510000, China

引用本文:

谢文珍, 王震宇, 韩恩厚. 耐蚀钢筋在模拟混凝土孔隙液环境及海砂混凝土中钢筋在模拟海水环境中的钝化及腐蚀行为[J]. 中国腐蚀与防护学报, 2024, 44(6): 1454-1464.
Wenzhen XIE, Zhenyu WANG, En-Hou HAN. Passivation Behavior of Corrosion Resistant Rebar Steels as Bare Steels in a Simulated Concrete Pore Fluid and as Rebar Steels Embedded in Concrete Made of Cement and Sea-sand in a Simulated Seawater[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1454-1464.

全文: PDF(7119 KB) HTML

摘要:

利用电化学技术、微观分析技术，研究Cr10Mo1耐蚀钢筋和在不含Cl^-模拟混凝土孔隙液以及埋入海砂混凝土中HRB400普通钢筋模拟海水环境中的钝化行为规律和腐蚀机理，并采用电阻探针技术建立钢筋腐蚀快速评价方法。结果表明：耐蚀钢筋在pH 11.5的模拟液中，表现出较好的钝化行为。在模拟海水环境中，耐蚀钢筋的钝化膜电阻阻值比普通钢筋更大、耐蚀钢筋的腐蚀电流密度也比普通钢筋更小，结合EDS测试和XRD测试，结果表明因存在Cr，通过钝化反应生成的Cr₂O₃使耐蚀钢筋表现出更优异的耐蚀性能。为了快速评价耐蚀钢筋的腐蚀行为，使用了电阻探针法在模拟海水环境中对其腐蚀速率进行计算，计算得出耐蚀钢筋的年腐蚀速率为0.0047 mm/a，并结合失重法测试的结果证实了此方法可以用作快速评价钢筋的腐蚀行为。

关键词 ：混凝土孔隙液, 海砂混凝土, 腐蚀电化学, 电阻探针, 模拟海水环境

Abstract：

The passivation behavior of Cr10Mo1corrosion-resistant rebar steel and ordinary HRB400 rebar steel either as bare steels in a Cl^- free simulated concrete pore solution, or as rebar steels embedded in a concrete made of cement and reagent sea-sand in an artificial seawater 3.5% NaCl solution were studied by electrochemical technology and microscopic analysis technology, meanwhile the resistance probe technology was used to establish a rapid evaluation method of rebar corrosion. The results show that the corrosion resistant rebar steel exhibits better passivation behavior in the simulated pore solution with pH 11.5. In the second testing circumstance, the passivation film resistance value of the corrosion-resistant rebar steel is larger than that of the ordinary rebar steel, correspondingly, the corrosion current density of corrosion-resistant rebar steel is also smaller than that of the ordinary one. Results of EDS and XRD characterization show that due to the presence of Cr element, Cr₂O₃ generated by passivation reaction makes corrosion-resistant rebar steel exhibit better corrosion resistance. In order to rapidly evaluate the corrosion behavior of corrosion-resistant rebar steel, the resistance probe method was adopted to assess the corrosion rate of corrosion-resistant rebar steel in the second testing circumstance environment of seawater sand concrete. Consequently, the annual corrosion rate of corrosion-resistant bar steel was acquired to be 0.0047 mm/a. While the corrosion rate acquired by mass loss method dose further confirm that this resistance probe method may suitably be used to rapidly evaluate the corrosion behavior of steel bars within concretes.

Key words： concrete pore fluid seawater sand concrete corrosion electrochemistry resistance probe simulated seawater

收稿日期: 2023-10-08 32134.14.1005.4537.2023.360

ZTFLH:

TG174

基金资助:国家重点研发计划(2021YFB3701700)

通讯作者: 王震宇，E-mail：zywang@icost.ac.cn，研究方向为腐蚀与防护技术；
韩恩厚，E-mail：ehhan@icost.ac.cn，研究方向为腐蚀与防护技术

Corresponding author: WANG Zhenyu, E-mail: zywang@icost.ac.cn；
HAN En-Hou, E-mail: ehhan@icost.ac.cn

作者简介: 谢文珍，女，1999年生，硕士生

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图1 耐蚀钢筋腐蚀监测装置图

图2 钢筋在不同pH模拟孔隙液中的开路电位

图3 钢筋在不同pH模拟孔隙液中的电化学阻抗图

图4 钢筋钝化的等效电路图

表1 电化学阻抗谱的拟合结果

图5 钢筋在不同pH的模拟孔隙液中的动电位极化图

表2 动电位极化的电化学特征参数

图6 在实际服役条件下耐蚀钢筋与普通钢筋HRB400的电化学阻抗谱图及等效电路图

表3 电化学阻抗的拟合结果

图7 在实际服役条件下耐蚀钢筋与普通钢筋HRB400的极化曲线图

表4 在实际服役条件下耐蚀钢筋与普通钢筋线性极化的拟合结果

图8 耐蚀钢筋和普通钢筋HRB400腐蚀前后的SEM图

图9 耐蚀钢筋和普通钢筋HRB400钝化后的EDS分析结果

图10 耐蚀钢筋和普通钢筋HRB400腐蚀产物的XRD图

表5 通过失重法计算真实服役条件下耐蚀钢筋与普通钢筋HRB400的腐蚀速率

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