劉明，程學(xué)群，李曉剛，金柱，劉海霞，趙瑞濤

（北京科技大學(xué)腐蝕與防護(hù)中心， 北京 100083）

　　摘要：應(yīng)用動(dòng)電位極化、電化學(xué)阻抗譜、Mott-Schottky、恒電位極化和浸泡實(shí)驗(yàn)的方法研究了HRB400鋼筋在含0.1%NaCl飽和Ca（OH）2混凝土模擬孔隙溶液中的點(diǎn)蝕性能。結(jié)果表明：隨著溶液溫度的升高，HRB400鋼筋的自腐蝕電位負(fù)移，腐蝕電流密度增大，點(diǎn)蝕電位降低，鈍化膜阻抗降低。HRB400鋼筋的半導(dǎo)體類型和性質(zhì)在不同溫度下發(fā)生改變。HRB400鋼筋發(fā)生點(diǎn)蝕的孕育期隨著溫度的升高而縮短，點(diǎn)蝕敏感性增加。隨著溫度的升高，HRB400鋼筋的均勻腐蝕速率增大，但在較高溫度下鋼筋表面出現(xiàn)了明顯的點(diǎn)蝕坑。

　　關(guān)鍵詞：動(dòng)電位極化；電化學(xué)阻抗譜；鈍化膜；點(diǎn)蝕；浸泡實(shí)驗(yàn)

Influence of temperature on pitting corrosion resistance of HRB400 steel rebar in simulated concrete pore solution in presence of Cl^-

Liu Ming,Cheng Xuequn,Li Xiaogang,Jin Zhu,Liu Haixia,Zhao Ruitao

（Corrosion and protection center of University of Science and Technology Beijing,Beijing 100083）

　　Abstract: The electrochemical behaviors of a HRB400 steel rebar specimens were studied by potentiodynamic polarization, electrochemical impendence spectroscopy, Mott-Schottky, constant potential polarization and immersion test in Ca（OH）2 saturated solution containing 0.1%NaCl. The results showed that with the increase of the temperature, open-circuit corrosion potential and pitting corrosion potential decreased, corrosion current density increased, the impedance of passive film decreased. The semi-conductive styles and properties of passive film changed at different temperatures. Also the pregnancy time of pitting shortened and the sensitivity of pitting increased remarkably as the temperature increased. In addition, with the increase of temperature, the uniform corrosion rate of HRB400 steel increased,  serious pitting corrosion appeared on the surface of the samples at higher temperatures.

　　Key words:The potentiodynamic polarization;Electrochemical impedance spectroscopy; passivation film; pitting corrosion; immersion test

　　聯(lián)系方式

　　劉明：liuming870313@stu.xjtu.edu.cn

責(zé)任編輯：趙澤南

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