钢筋表面微区电位分布的原位测量  

In-Situ Measurement of Potential Distribution on Surfaceof Reinforcing Steel in Simulated Concrete Pore Solution

作　　者：李彦[1] 杜荣归[1] 邵敏华[1] 胡融刚[1] 林玉华[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,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2004年第1期138-140,共3页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金(20127302);福建省自然科学基金(E0210006)资助

摘　　要：应用自行研制的扫描微参比电极联机测量系统,原位测量了钢筋在模拟混凝土孔隙液中表面微区电位分布.结果表明,钢筋在纯饱和Ca(OH)2溶液中处于钝态.当溶液的pH降低和外加Cl-时,钢筋表面微区电位分布即发生变化,电位差变大,钢筋表面随之发生点腐蚀.A scanning micro-reference-electrode technique controlled by micro-computer was used to (measure) the potential distribution on the surface of the reinforcing steel and to study the pitting initiation in early stage of the reinforcing steel in chloride-free and chloride-contaminated simulated concrete pore (solutions). The results showed that the reinforcing steel exhibited different corrosion characteristics in the different solutions. There were some unstable micro-pitting nuclei on the surface of the steel in the pure (Ca(OH)_2) solution and the steel remained passivated. However, the potential distribution on the surface of the reinforcing steel varied considerably and the pitting corrosion occurred on the steel when a sufficient quantity of Cl^- was added to the solution and pH fell.

关 键 词：钢筋表面微区 电位分布 原位测量 点腐蚀 扫描微参比电极 钢筋腐蚀 

分 类 号：TG174.36[金属学及工艺—金属表面处理]