钢筋混凝土阴极保护特性及其微观机制  

Characteristic and Micromechanism of Cathodic Protection for Reinforced Concrete

作　　者：徐晶[1] 姚武[1] 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《建筑材料学报》2010年第3期315-319,共5页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50978200);高等学校博士点基金资助项目(20070247063)

摘　　要：综合利用X射线衍射及扫描电镜,分析了钢筋腐蚀产物和钢筋/混凝土界面微观性能.结果发现:未经阴极保护处理的试样更多地生成了主要腐蚀产物Fe3O4,并且在Cl-大量存在的情况下,还进一步生成了Fe3+(O,OH,Cl);阴极保护有助于钢筋/混凝土界面处Ca(OH)2晶体的存在,从而能保持界面处的高碱性,而且阴极电流能使Cl-迁移而远离钢筋,使钢筋受到有效保护.For the purpose of exploring the mechanism underlying the efficiency of cathodic protection,X-ray diffraction（XRD） combined with scanning electron microscopy（SEM） were applied for microstructural analysis of corrosion products and steel/concrete interface.The study shows that more common corrosion product Fe3O4 is produced in specimens if cathodic protection is not provided.Besides,corrosion product of Fe^3＋（O,OH,Cl） can also formed when chlorides are abundant in concrete.Cathodic protection is helpful for the formation of Ca（OH）2 crystal,thereby the high alkalinity of the steel/paste interface is retained.Chloride ions are mitigated away from the steel surface by cathodic current.These effects guarantee the efficient protection of steel reinforcement.

关 键 词：钢筋混凝土 腐蚀 阴极保护 电化学性能 形貌 

分 类 号：TU528.01[建筑科学—建筑技术科学]