埋置式复合探针原位测定钢筋/混凝土界面氯离子和pH值  

Embeddable Combination Probe for In-situ Measuring Cl - and pH at the Reinforcing Steel/Concrete Interface

作　　者：杜荣归[1] 黄若双[1] 胡融刚[1] 赵冰[1] 林玉华[1] 谭建光[1] 林昌健[1] 

机构地区：[1]厦门大学化学系,物理化学研究所,固体表面物理化学国家重点实验室,厦门361005

出　　处：《分析化学》2005年第1期29-32,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No. 20473066);教育部重点项目;福建省自然科学基金(No.E0210006)资助项目

摘　　要：分别应用电化学阳极氧化法和高温碳酸盐法制备了Ag/AgCl电极和IrO2 pH电极,组成测定Cl-和pH值的复合探针,用于埋置于钢筋混凝土试样中,原位测定钢筋 /混凝土界面或混凝土中的Cl-和pH值。两种电极的电位分别对介质溶液中Cl-浓度的对数和pH值呈良好的线性关系。探针的稳定性好,可应用于定量检测试样中钢筋 /混凝土界面或混凝土内部的Cl-和pH值。Ag/AgCl electrodes and Ir/IrO2, electrodes were prepared by anodic electrochemical oxidation and thermal oxidation in carbonate and served as Cl- and pH probes, respectively. The potentiometric response of the Ag/AgCl electrode to the logarithm of Cl- concentrations ranging from I X 10(-4) to 2 mol/L in saturated Ca(OH)(2) solution trying to simulate the inner electrolytic medium of the concrete shows very good linearity, and the Ir/IrO2 electrode also shows an ideal Nernstian response between pH I and pH 14. The Ag/AgCl and Ir/IrO2 electrodes were combined into combination Cl-/pH probe, and the probe can be embedded in the concrete and measure Cl- contents and pH at the steel/concrete interface or in the concrete because of its satisfying mechanical property and long term stability of the potential readings depending on the Cl- concentration or pH. The results are of significance to study the influence of Cl- concentration and pH on the mechanism of reinforcement corrosion in concrete.

关 键 词：混凝土界面 钢筋混凝土 原位测定 氯离子 Cl^- 用电 高温 复合探针 PH电极 组成测定 

分 类 号：TU528[建筑科学—建筑技术科学]