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首页> 外文期刊>International Journal of Electrochemical Science >Electrochemical Investigation of Passive Film Properties on Low Alloy Steel Rebars in Cement Extract and Saturated Ca(OH)2 Solutions
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Electrochemical Investigation of Passive Film Properties on Low Alloy Steel Rebars in Cement Extract and Saturated Ca(OH)2 Solutions

机译：低合金钢在水泥萃取液和饱和Ca（OH） 2 溶液中的钝化膜性能的电化学研究

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摘要

In this paper, the differences in the passivation behaviours of low alloy steel rebars in saturated Ca(OH) 2solution (SC) and cement extract solution (CE) were studied by Mott-Schottky, XPS and cyclicpotentiodynamic polarisation (CPP) analyses. The results indicate that the formation rate of a passivefilm in SC is faster than that in CE at the initial stage of immersion. With the same passivation time, thepassive film that formed in CE has a lower self-corrosive current density, a greater film resistance, athicker film and better stability than the film formed in SC. The passive films formed in SC and CE havethe same composition, and they both exhibit n-type semiconductor characteristics, but the passive filmsformed in CE have a lower donor carrier concentration and better compactness than those formed in SC.The unpassivated steel has a higher critical Cl - concentration in SC. However, after the steel rebar ispassivated for 7 days, the critical Cl - concentration in CE is higher than that in SC. The critical Cl -concentration of passivated steel rebars is 4 times higher than that of unpassivated steel rebars, whichindicates that passive films can significantly improve the pitting corrosion resistance of steel rebars.
机译：本文通过Mott-Schottky，XPS和循环电势极化（CPP）分析研究了低合金钢在饱和Ca（OH）2溶液（SC）和水泥提取液（CE）中的钝化行为差异。结果表明，在浸没初期，SC中钝化膜的形成速率比CE中的钝化膜快。在相同的钝化时间下，与在SC中形成的膜相比，在CE中形成的钝化膜具有更低的自腐蚀电流密度，更大的膜电阻，更厚的膜和更好的稳定性。在SC和CE中形成的钝化膜具有相同的成分，并且都具有n型半导体特性，但是在CE中形成的钝化膜具有比SC中形成的低的施主载流子浓度和更好的致密性。 Cl-SC中的浓度。然而，在将钢筋钝化7天后，CE中的临界Cl-浓度高于SC中的临界Cl-浓度。钝化钢筋的临界Cl浓度是未钝化钢筋的4倍，这表明钝化膜可以显着提高钢筋的抗点蚀性。

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