钼酸钠复合溶液下预应力锈蚀钢绞线的再钝化研究

doi:10.16552/j.cnki.issn1001-1625.2026.0019

硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (7): 2549-2560.DOI: 10.16552/j.cnki.issn1001-1625.2026.0019

钼酸钠复合溶液下预应力锈蚀钢绞线的再钝化研究

单志龙¹^,²(), 张云升¹(), 张守祺², 张宇¹, 刘庆阳³, 王友平³

^1.兰州理工大学土木与水利工程学院，兰州 730050
^2.中路高科交通检测检验认证有限公司，交通基础设施智能制造技术交通运输行业研发中心，北京 100088
^3.海南交控公路工程养护有限公司，海口 570203

收稿日期:2026-01-07 修订日期:2026-01-31 出版日期:2026-07-15 发布日期:2026-08-13
通信作者: 张云升，博士，教授。E-mail：zhangyunsheng2011@163.com
作者简介:单志龙（2000—），男，硕士研究生。主要从事预应力钢筋锈蚀方面的研究。E-mail：2352660050@qq.com
基金资助:
国家自然科学基金(52478255);国家自然科学基金(U21A20150);甘肃省高等教育机构科研与自然科学创新基金(2022CYZC-25);甘肃省青年科技基金(24JRRA196)

Repassivation of Prestressed Corroded Steel Strand in Sodium Molybdate Composite Solution

SHAN Zhilong¹^,²(), ZHANG Yunsheng¹(), ZHANG Shouqi², ZHANG Yu¹, LIU Qingyang³, WANG Youping³

^1.School of Civil and Hydraulic Engineering，Lanzhou University of Technology，Lanzhou 730050，China
^2.Transportation Infrastructure Intelligent Manufacturing Technology Transportation Industry R&D Centre，Zhonglu High-tech Traffic Inspection and Certification Co.，Ltd.，Beijing 100088，China
^3.Hainan Jiaotong Highway Engineering Maintenance Company，Haikou 570203，China

Received:2026-01-07 Revised:2026-01-31 Published:2026-07-15 Online:2026-08-13

摘要/Abstract

摘要：

为了延长预应力钢筋混凝土结构的使用寿命，本文研究配制了钼酸钠复合溶液用于对锈蚀钢绞线进行再钝化处理。通过电化学测量、力学测试和微观结构表征，对未锈蚀钢绞线、锈蚀钢绞线及再钝化处理钢绞线进行了对比研究。结果表明，再钝化处理显著提升了钢绞线的抗腐蚀性能：电位发生正向移动，腐蚀电流密度降低，奈奎斯特电容弧增大。再钝化后钢绞线的屈服强度和抗拉强度基本保持不变，但锈蚀导致延展性降低15%，再钝化处理可恢复10%的延展性损失，且再钝化后钢绞线与混凝土之间的黏结强度与未锈蚀相比有所提高。微观结构分析揭示，再钝化钢绞线的性能提升源于由钼酸盐和磷酸盐相构成的致密针状薄膜的形成。这些发现证实再钝化技术能在不降低抗拉性能的前提下有效恢复锈蚀钢绞线的性能，为预应力混凝土基础设施提供了极具前景的修复方案。

关键词: 锈蚀钢绞线再钝化, 钼酸盐-磷酸盐复合膜, 电化学, 力学性能, 钢筋混凝土结构

Abstract:

To extend the service life of prestressed reinforced concrete structures， this study developed a composite sodium molybdate solution for repassivation treatment of corroded steel strands. Electrochemical measurements， mechanical tests， and microstructural characterization were conducted to compare uncorroded， corroded， and repassivated steel strands. Results indicate that repassivation significantly enhances the corrosion resistance of steel strands： the potential shifts toward a more positive value， corrosion current density decreases， and the Nyquist arc widens. After repassivation， the yield strength and tensile strength of steel strands remain largely unchanged. While corrosion reduces ductility by 15%， repassivation restores 10% of the lost ductility. Bond strength between repassivated strands and concrete improves compared to uncorroded strands. Microstructural analysis reveals that the performance enhancement of the repassivated steel strands stems from the formation of a dense， needle-like film composed of molybdate and phosphate phases. These findings confirm that repassivation technology effectively restores the properties of corroded steel strands without compromising tensile performance， offering a highly promising repair solution for prestressed concrete infrastructure.

Key words: repassivation of corroded steel strand, molybdate-phosphate composite film, electrochemistry, mechanical property, reinforced concrete structure

中图分类号:

TU511

单志龙, 张云升, 张守祺, 张宇, 刘庆阳, 王友平. 钼酸钠复合溶液下预应力锈蚀钢绞线的再钝化研究[J]. 硅酸盐通报, 2026, 45(7): 2549-2560.

SHAN Zhilong, ZHANG Yunsheng, ZHANG Shouqi, ZHANG Yu, LIU Qingyang, WANG Youping. Repassivation of Prestressed Corroded Steel Strand in Sodium Molybdate Composite Solution[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(7): 2549-2560.

图/表 16

表1 钢绞线的力学性能

Table 1 Mechanical properties of steel strand

Diameter/mm	Yield strength/MPa	Tensile strength/MPa	Elastic modulus/GPa	Linear density/（kg·m^-1）
15.2	1 770	1 930	197	1.101

图1 钢绞线再钝化前后表面样貌图

Fig.1 Surface appearance diagram of steel strand before and after repassivation

表2 灌浆材料的性能指标

Table 2 Performance index of grouting material

Setting time/h		Fluidity/s			28 d flexural strength/MPa	28 d compressive strength/MPa
Initial setting	Final setting	Initial	30 min	60 min	28 d flexural strength/MPa	28 d compressive strength/MPa
6	16	15	18	22	11	60

图2 电化学测试试件结构示意图

Fig.2 Schematic diagram of electrochemical test specimen structure

图3 黏结力测试试件结构示意图

Fig.3 Schematic diagram of adhesion test specimen structure

图4 试件的制备过程及试验方法

Fig.4 Test specimen preparation process and test method

图5 试件的开路电位和极化曲线

Fig.5 OCP and polarization curve results of specimens

表3 试件的腐蚀电位与腐蚀电流密度

Table 3 Corrosion potential and corrosion current density of specimens

Treatment status	OCP/V	J/（μA·cm^-2）
Uncorroded	-0.456 2	10^-1.99
Corroded	-0.672 9	10^-0.86
Passivated	-0.541 6	10^-1.49

表4 模拟电路中等效参数的变化

Table 4 Variation of equivalent parameters in analogue circuits

Treatment status	L/μH	R_s/（kΩ·cm²）	R_ct/（kΩ·cm²）	CPE/（nS·s ^N ）	C/（μF·cm^-2）	χ²
Uncorroded	177	0.443	4.09	261， N=0.93	137	0.000 12
Corroded	119	0.593	2.06	203， N=0.81	261	0.000 29
Passivated	157	0.519	3.04	237， N=0.85	193	0.000 07

图6 等效电路模型与试件的交流阻抗测试结果

Fig.6 Equivalent circuit diagram and ac impedance test results of specimens

图7 钢绞线的拉拔试验测试结果

Fig.7 Drawing test results of steel strand

表5 试件残余系数

Table 5 Residual coefficient of specimens

Item	Uncorroded	Corroded	Repassivated
Yield strength f_y，D/MPa	1 770	1 710	1 715
Residual coefficient k_fy	1	0.966	0.969
Tensile strength f_u，D/MPa	1 930	1 860	1 885
Residual coefficient k_fu	1	0.964	0.967
Modulus of elasticity E_D/GPa	197	197	197
Residual coefficient k_E	1	1	1
Elongation δ_D/%	6.684	5.581	6.398
Residual coefficient k_δ	1	0.835	0.957

图8 钢绞线与混凝土的黏结试验测试结果

Fig.8 Bond test results between steel strand and concrete

图9 钢绞线的表面微观形貌及元素组成

Fig.9 Surface microstructure and elemental composition of steel strands

图10 钢绞线的XPS测试结果

Fig.10 XPS test results of steel strand

图11 钢绞线表面再钝化机理示意图

Fig.11 Schematic diagram of surface repassivation mechanism for steel strand

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钼酸钠复合溶液下预应力锈蚀钢绞线的再钝化研究

Repassivation of Prestressed Corroded Steel Strand in Sodium Molybdate Composite Solution

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