本文關(guān)鍵詞： 電化學(xué)修復(fù) 氫脆 陰極極化曲線 析氫反應(yīng) 臨界電流密度　出處：《中國(guó)腐蝕與防護(hù)學(xué)報(bào)》2017年04期 　論文類型：期刊論文

【摘要】：采用動(dòng)電位極化測(cè)定方法,在測(cè)得鋼筋的陰極極化曲線之后,通過對(duì)其進(jìn)行一階微分分析,確定了鋼筋的臨界析氫電位及相應(yīng)的析氫電流密度,之后采用穩(wěn)態(tài)測(cè)量法獲得鋼筋析氫穩(wěn)態(tài)臨界電流密度。結(jié)果表明,動(dòng)電位極化曲線能夠記錄陰極電化學(xué)反應(yīng)的變化過程,一階微分曲線出現(xiàn)突變點(diǎn)之前,陰極反應(yīng)以耗氧反應(yīng)控制為主,突變點(diǎn)之后以析氫反應(yīng)控制為主;并可以測(cè)定鋼筋混凝土中鋼筋析氫穩(wěn)態(tài)臨界電流密度,從而判斷氫脆發(fā)生的可能性。采用該方法測(cè)得鋼筋混凝土試件的析氫穩(wěn)態(tài)臨界電流密度約為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).
【作者單位】： 浙江大學(xué)結(jié)構(gòu)工程研究所;中國(guó)能建集團(tuán)浙江省電力設(shè)計(jì)院有限公司;浙江大學(xué)寧波理工學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(51578490,51408534和51408544) 浙江省自然科學(xué)基金(LQ14E080010) 杭州市重大科技創(chuàng)新專項(xiàng)(20142011A41) 杭州市科技計(jì)劃(20131831K31,20140533B42和20130533B18)~~
【分類號(hào)】：U657
【正文快照】： 沿海地區(qū)是我國(guó)大規(guī)模經(jīng)濟(jì)建設(shè)的集中地區(qū)。然而,由于海水和海洋氣候等腐蝕環(huán)境的影響,沿海地區(qū)的鋼筋混凝土結(jié)構(gòu)易受到Cl-侵蝕,從而出現(xiàn)鋼筋銹蝕,造成重大的經(jīng)濟(jì)損失[1]。目前,國(guó)內(nèi)外諸多研究和工程實(shí)踐已證實(shí),對(duì)既有鋼筋混凝土結(jié)構(gòu)進(jìn)行電化學(xué)修復(fù)可有效除去Cl-,延長(zhǎng)結(jié)構(gòu)的使，

本文編號(hào)：1462101