模拟混凝土孔溶液中钢筋钝化膜生长动力学及孔蚀过程的研究

电化学（中英文） ›› 1995, Vol. 1 ›› Issue (4): 415-421.

模拟混凝土孔溶液中钢筋钝化膜生长动力学及孔蚀过程的研究

储炜，史苑芗，魏宝明, 杨勇，陈旭光，林祖赓

南京化工大学应用化学系, 固体表面物理化学国家重点实验室，厦门大学化学系

收稿日期:1995-11-28 修回日期:1995-11-28 出版日期:1995-11-28 发布日期:1995-11-28

Growth Kinetics and Breakdown of Passive Films on REBAR Electrodes in Simulated Cement Pore Solution

Chu Wei;Shi Yuanxiang;Wei Baoming

(Dept.of Applied Chemistry,Nanjing University of Chemical Technology, Nanjing,210009)Yang Yong;Chen Xuguang;Lin Zugeng (State Key Laboratory for Physical Chemistry of the Solid Surface,Dept.of Chemistry,Xiamen University,

Received:1995-11-28 Revised:1995-11-28 Published:1995-11-28 Online:1995-11-28

摘要/Abstract

摘要： 用恒电位电流衰减法及激光扫描光电化学显微技术研究了在于ｐＨ＝１２．５及１３．８的模拟混凝土孔溶液中钢筋钝化膜的生长动力学及相应的破坏过程，实验结果表明，钢筋钝化膜的生长过程存在两个主要阶段，各阶段膜厚均与生长时间存在正比对数关系，但当ｔ＜３０秒和ｔ＞３０秒时，膜的生长表现出不同的动力学特征．在钝化膜发生点蚀前，钝化膜的微区光电流表现出一定的预兆．腐蚀抑制剂ＮａＮＯ＿２影响膜的生长过程及膜厚，能提高钢筋的抗氯离子点蚀能力．

关键词: 钢筋钝化膜, 模拟混凝土孔溶液, 恒电位电流衰减, 激光扫描光电化学显微技术

Abstract: The growth kinetics and breakdown of passive films on REBAR electrodes insimulated cement solution(pH=12.5 and 13.8)have been investigated using in situphotoelectrochemical methods and potential step method. The results show that there are two mainstages in the growth of the film ,with two rate functions characterized by linear relation between thefilm thickness and the direct logarithm of time. There is a sign in laser-scanning photoelectrochemicalmicroscopic image just before the passive film breaks down. The addition of inhibitor NaNO_2changesthe growth kinetics and thickness of the film ,and therefore improves the resistance of pitting corrosioninduced by chloride.

Key words: passive films on REBAR, Simulated cement pore solution, Laser scanningphotoelectrochemical microscopy

中图分类号:

TG171

储炜，史苑芗，魏宝明, 杨勇，陈旭光，林祖赓. 模拟混凝土孔溶液中钢筋钝化膜生长动力学及孔蚀过程的研究[J]. 电化学（中英文）, 1995, 1(4): 415-421.

Chu Wei;Shi Yuanxiang;Wei Baoming. Growth Kinetics and Breakdown of Passive Films on REBAR Electrodes in Simulated Cement Pore Solution[J]. Journal of Electrochemistry, 1995, 1(4): 415-421.

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