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工程科学与技术:2020,52(6):206-214
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可埋入式混凝土用固态Mn/MnO2参比电极制备及性能表征
(1.青岛理工大学 土木工程学院,山东 青岛 266033;2.山东省高校蓝色经济区工程建设与安全协同创新中心,山东 青岛 266033)
Preparation and Characterization of Mn/MnO2 Reference Electrode for Buried Concrete
(1.School of Civil Eng., Qingdao Univ. of Technol., Qingdao 266033, China;2.Cooperative Innovation Center of Eng. Construction and Safety in Shandong Blue Economic Zone, Qingdao 266033, China)
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投稿时间:2019-09-18    修订日期:2019-12-30
中文摘要: 氯盐侵蚀是影响海洋环境和盐湖、盐渍土地区混凝土结构中钢筋腐蚀最主要的因素。因此,及时、准确掌握钢筋混凝土结构内部氯离子分布状态对于严酷环境条件下钢筋混凝土结构的耐久性评估、防护与修复意义重大。本文采用物理粉压法制备了一种结构致密、性能稳定的可埋入式混凝土用固态Mn/MnO2参比电极。结果表明:加载压力是影响压片法制备Mn/MnO2电极强度、致密度的重要参数。在制备Mn/MnO2电极时,需要控制好加载压力,推荐加载压力为96 MPa。该电极在使用之前必须进行活化,活化后的Mn/MnO2电极响应时间小于60 s,稳定性、重现性和抗极化性能良好。当Mn/MnO2电极在5~65 ℃温度范围内工作时,电极电位与温度线性相关。当Mn/MnO2电极在pH值8.36~13.00范围内工作时,电极电位保持恒定。所以,如果将本文方法制备的Mn/MnO2电极作为氯离子传感器的参比电极埋入混凝土中时,必须同时测试混凝土内部的温度,并作修正。
中文关键词: 参比电极  粉压法  性能表征  影响因素
Abstract:Chloride penetration is the main reason for corrosion of steel bars in reinforced concrete in marine environment, salt lake area and saline soil area. Therefore, the measurement of chloride distribution in reinforced concrete structures timely and accurately is of great significance for durability assessment, maintenance and repair of reinforced concrete structures under severe environment. In this paper, a solid-state Mn/MnO2 reference electrode with dense structure and stable performance, which can be embedded in concrete, was prepared by pressed powder method. Results showed that loading pressure is an important parameter that affects the strength and density of Mn/MnO2 electrode prepared. During the preparation of Mn/MnO2 electrode, it is necessary to control the loading pressure. The suggested pressure loading pressure is 96 MPa. And the Mn/MnO2 electrode must be activated before use. After activated, the response time of the Mn/MnO2 electrode is less than 60 second. Also, the Mn/MnO2 electrode has stable performance, good reproducibility and good resistance of polarization. The potential value of the Mn/MnO2 electrode increases linearly with the increase of temperature between 5 ℃ and 65 ℃. Besides, the pH value between 8 and 13 has nearly no effect on the potential value of the Mn/MnO2 electrode. So, if the Mn/MnO2 electrode prepared in this paper is used as reference electrode of chloride sensor, the temperature of concrete at the location of chloride sensor is also needed to record simultaneously. And the potential value of the Mn/MnO2 electrode must be corrected by temperature.
文章编号:201900907     中图分类号:TU528    文献标志码:
基金项目:国家自然科学基金项目(U1706222;51878365);山东省重点研发计划项目(2019GSF110006)
作者简介:王鹏刚(1982-),男,副教授,博士.研究方向:混凝土结构耐久性.E-mail:wangpenggang007@163.com
引用文本:
王鹏刚,王缘,郭腾飞,赵铁军,田砾,金祖权,万小梅,王兰芹.可埋入式混凝土用固态Mn/MnO2参比电极制备及性能表征[J].工程科学与技术,2020,52(6):206-214.
WANG Penggang,WANG Yuan,GUO Tengfei,ZHAO Tiejun,TIAN Li,JIN Zuquan,WAN Xiaomei,WANG Lanqin.Preparation and Characterization of Mn/MnO2 Reference Electrode for Buried Concrete[J].Advanced Engineering Sciences,2020,52(6):206-214.