<strong>CSA-OPC</strong>基修补材料的耐海水腐蚀性及其机理研究

doi:10.11902/1005.4537.2023.101

中国腐蚀与防护学报

2024, Vol. 44

Issue (2): 462-470 CSTR: 32134.14.1005.4537.2023.101 DOI: 10.11902/1005.4537.2023.101

研究报告

本期目录 | 过刊浏览

CSA-OPC基修补材料的耐海水腐蚀性及其机理研究

李国新(

), 陈华湘, 伍扬帆

西安建筑科技大学材料科学与工程学院西安 710055

Corrosion Resistance and Mechanism of CSA-OPC Based Repair Materials in Artificial Seawaters

LI Guoxin(

), CHEN Huaxiang, WU Yangfan

School of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

引用本文:

李国新, 陈华湘, 伍扬帆. CSA-OPC基修补材料的耐海水腐蚀性及其机理研究[J]. 中国腐蚀与防护学报, 2024, 44(2): 462-470.
Guoxin LI, Huaxiang CHEN, Yangfan WU. Corrosion Resistance and Mechanism of CSA-OPC Based Repair Materials in Artificial Seawaters[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 462-470.

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摘要:

采用实验室加速腐蚀模拟实验，研究硫铝酸盐水泥-普通硅酸盐水泥基修补材料(CSA-OPC体系)在NaCl、NaCl + Na₂SO₄、NaCl + Na₂SO₄ + MgCl₂腐蚀溶液以及干-湿循环耦合作用下，其质量、抗压强度、粘结强度及Cl^-含量的变化规律，并用X射线衍射(XRD)和扫描电子显微镜(SEM)进行微观表征，探究不同OPC掺量下的CSA-OPC体系的耐海水腐蚀性能及其机理，揭示海洋环境中不同腐蚀性离子间的交互作用。结果表明：在NaCl、NaCl + Na₂SO₄、NaCl + Na₂SO₄ + MgCl₂腐蚀溶液环境下，适量OPC的掺入能明显改善CSA的耐海水腐蚀性能，当OPC掺量为20%~30%时，CSA-OPC体系的质量变化、抗压强度、粘结强度、Cl^-结合能力最佳，Cl^-进入体系通过生成Friedel's盐被固化，SO₄^2-会抑制Cl^-的结合，Mg²⁺会消耗更多OH^-，降低Cl^-的结合率。

关键词 ：海洋潮汐区, 离子耦合腐蚀, 修补材料, 硫铝酸盐水泥, 普通硅酸盐水泥

Abstract：

Several sulfoaluminate cement-ordinary Portland cement-based repair materials (CSA-OPC) were prepared, then their corrosion resistance in artificial seawaters containing NaCl, NaCl+Na₂SO₄, NaCl + Na₂SO₄ + MgCl₂ respectively were assessed via dry-wet cycle test, X-ray diffractometer (XRD) and scanning electron microscopy (SEM). The study focuses on the evolution of mass, compressive strength, bond strength and Cl^- content of the CSA-OPC with the variation of OPC content and corrosion process. The results show that in the test conditions with solutions of NaCl, NaCl + Na₂SO₄, NaCl + Na₂SO₄ + MgCl₂, an appropriate amount of OPC incorporation can significantly improve the corrosion resistance of CSA in artificial seawaters. When the content of OPC is 20%-30%, the mass change, compressive strength, bond strength and Cl^- combination ability of CSA-OPC are the best. The Cl^- infiltrated into the CSA-OPC materials are trapped through the formation of Friedel's salt, while the SO₄^2- may inhibit the combination of Cl^-, and Mg²⁺ may reduce the combination rate of Cl^- by consuming more OH^-.

Key words： ocean tidal area ion coupled erosion repair material sulphoaluminate cement ordinary Portland cement

收稿日期: 2023-04-04 32134.14.1005.4537.2023.101

ZTFLH:

TU525

通讯作者: 李国新，E-mail：liguoxin@xauat.edu.cn，研究方向为新型水泥基材料

Corresponding author: LI Guoxin, E-mail: liguoxin@xauat.edu.cn

作者简介: 李国新，男，1975年生，博士，教授

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表1 CSA与OPC的化学组成 (mass fraction / %)

表2 CSA与OPC的性能参数

表3 砂浆实验配合比

表4 腐蚀溶液化学成分 (g/L)

图1 Cl-测试取样示意图

图2 CSA-OPC体系在3种腐蚀溶液中进行干-湿循环实验不同周次后的质量变化

图3 CSA-OPC体系在3种腐蚀溶液中进行干-湿循环实验不同周次后的抗压强度

图4 CSA-OPC体系在3种腐蚀溶液中进行干-湿循环实验不同周次后的粘结强度

图5 CSA-OPC体系在3种腐蚀溶液中进行干-湿循环实验不同周次后的总Cl-含量

图6 CSA-OPC体系在3种腐蚀溶液中进行干-湿循环实验90周次后的Cl-结合率

图7 80%CSA-20%OPC体系与70%CSA-30%OPC体系在几种腐蚀溶液中进行干-湿循环实验不同周次后的XRD谱

图8 80%CSA-20%OPC体系在NaCl腐蚀溶液中进行干-湿循环实验不同周次后的微观形貌

图9 80%CSA-20%OPC体系在NaCl + Na2SO4腐蚀溶液中进行干-湿循环实验不同周次后的微观形貌

图10 70%CSA-30%OPC体系在NaCl + Na2SO4 + MgCl2腐蚀溶液中进行干-湿循环实验不同周次后的微观形貌

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