江苏大学学报（自然科学版）2013，Vol.34Issue(4)：476-480,5.DOI:10.3969/j.issn.1671-7775.2013.04.020
阳离子类型对混凝土中钢筋腐蚀临界氯离子浓度的影响
Effect of chloride cation type on chloride threshold value for steel corrosion in concrete
摘要
Abstract
Four kinds of chloride deicing salt,KCl,NaCl,CaCl2and MgCl2,were chosen to study the corrosion of steel reinforcement.The half-cell potential,electrochemical impedance spectroscopy,electrochemical titration and X-ray diffraction methods were used to investigate the effect of cation type on the corrosion behavior of steel reinforcement in concrete.Combined the open-circuit potential with corrosion current,the onset of pitting corrosion was detected by electrochemical impedance spectra.The results indicate that the cation type has a marked effect on the chloride threshold value (CTV),and the CTV is varied with its representation.When the CTV is expressed as the mass fraction of free chloride content,the sequence is wf(MgCl2) ＜wf(CaCl2) ＜wf(NaCl) ＜wf(KCl).When the form of c(Cl-)/c(OH-)is close,the relationship is cKCl (Cl-)/cKCl (OH-) ≈ cNaCl (Cl-)/cNaCl (OH-) ＜ cCaCl2 (Cl-)/cCaCl2(OH-) ＜ cMgCl2 (Cl-)/cMgCl2 (OH-).When the mass fraction of total chloride is used,the sequence is wt (KCl) ≈wt (NaCl) ＜ wt (MgCl2) ＜ wt (CaCl2).关键词
钢筋/混凝土/阳离子/腐蚀/临界氯离子浓度Key words
steel/ concrete / chloride cation / corrosion / chloride threshold value分类
建筑与水利引用本文复制引用
蒋林华,刘蓉,莫莉莉,徐金霞,储洪强..阳离子类型对混凝土中钢筋腐蚀临界氯离子浓度的影响[J].江苏大学学报（自然科学版）,2013,34(4):476-480,5.基金项目
国家自然科学基金资助项目(50978085,51278167) （50978085,51278167）
江苏省"六大人才高峰"计划项目(20090218) （20090218）
