电化学修复过程中钢筋析氢稳态临界电流密度测定实验方法

发布时间：2018-01-25 05:21

  本文关键词： 电化学修复 氢脆 阴极极化曲线 析氢反应 临界电流密度　出处：《中国腐蚀与防护学报》2017年04期 　论文类型：期刊论文

【摘要】：采用动电位极化测定方法,在测得钢筋的阴极极化曲线之后,通过对其进行一阶微分分析,确定了钢筋的临界析氢电位及相应的析氢电流密度,之后采用稳态测量法获得钢筋析氢稳态临界电流密度。结果表明,动电位极化曲线能够记录阴极电化学反应的变化过程,一阶微分曲线出现突变点之前,阴极反应以耗氧反应控制为主,突变点之后以析氢反应控制为主;并可以测定钢筋混凝土中钢筋析氢稳态临界电流密度,从而判断氢脆发生的可能性。采用该方法测得钢筋混凝土试件的析氢稳态临界电流密度约为0.355 A/m2。
[Abstract]:The critical hydrogen evolution potential and the corresponding hydrogen evolution current density were determined by the first order differential analysis after the cathodic polarization curve of steel bar was measured by potentiodynamic polarization method. The steady-state measurement method was used to obtain the steady critical current density of rebar hydrogen evolution. The results show that the polarization curve of dynamic potential can record the change process of cathodic electrochemical reaction, and the first order differential curve appears before the abrupt point. The cathode reaction was controlled mainly by the oxygen consumption reaction, and the hydrogen evolution reaction was mainly controlled after the mutation point. The steady state critical current density of hydrogen evolution in reinforced concrete can be measured. By using this method, the critical hydrogen evolution current density of reinforced concrete specimens is about 0.355A / m ~ (2), and the critical current density of hydrogen evolution is about 0.355A / m ~ (2).
【作者单位】： 浙江大学结构工程研究所;中国能建集团浙江省电力设计院有限公司;浙江大学宁波理工学院;
【基金】：国家自然科学基金(51578490,51408534和51408544) 浙江省自然科学基金(LQ14E080010) 杭州市重大科技创新专项(20142011A41) 杭州市科技计划(20131831K31,20140533B42和20130533B18)~~
【分类号】：U657
【正文快照】： 沿海地区是我国大规模经济建设的集中地区。然而,由于海水和海洋气候等腐蚀环境的影响,沿海地区的钢筋混凝土结构易受到Cl-侵蚀,从而出现钢筋锈蚀,造成重大的经济损失[1]。目前,国内外诸多研究和工程实践已证实,对既有钢筋混凝土结构进行电化学修复可有效除去Cl-,延长结构的使，

本文编号：1462101