Chloride-Induced Depassivation of Steel in Concrete—Influence of Electrochemical Potential and Anodic Polarization Level

Chloride-Induced Depassivation of Steel in Concrete—Influence of Electrochemical Potential and Anodic Polarization Level
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混凝土中钢的氯化物诱导去钝化——电化学电位和阳极极化水平的影响

DOI:
10.1007/978-3-319-90236-4_9
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发表时间:
2017
期刊:
RILEM Bookseries
影响因子:
--
通讯作者:
Raupach
Raupach
中科院分区:
--
文献类型:
--
作者:
Kosalla;Raupach

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探索钢筋在混凝土中的去钝化过程和氯离子阈值水平(CTL)是一个主要的研究挑战。去钝化过程受多种参数的影响。其中之一是钢势,更准确地说是它的空间分布、它的变化以及由此产生的差异和极化状态。对于某些电化学测试方法,有时会施加外部极化,但对自然进行的过程(如钢的去钝化)的影响在很大程度上仍未被探索。在测定钢筋去钝化时间时,结合测定CTL,使用外部阳极极化是一种既定的测试装置。在亚琛大学建筑材料研究所(IBAC),研究了不同程度的外阳极极化对钝化时间和CTL的影响。目前的研究表明,在钝化状态下,在+550 mV以下的阳极极化与自由休息电位相比,对去钝化行为没有明显的影响。
Exploring the depassivation process of reinforcing steel in concrete and the chloride threshold level (CTL) is a major research challenge. The depassivation process is influenced by a wide variety of parameters. One of these is the steel potential, more precisely its spatial distribution, its variations and the resulting differences and polarization states. For certain electrochemical test methods sometimes an external polarization is applied, but the influence on naturally ongoing processes like the depassivation of the steel has remained largely unexplored. When determining the time of depassivation of reinforcing steel, in conjunction with determining the CTL, the application of an external anodic polarization is an established test setup. At the Institute of Building Materials Research (ibac) of the RWTH Aachen University the effect of external anodic polarization to different levels on the time to depassivation and on the CTL is explored. The current investigations show that there is no clear effect on the depassivation behavior for anodic polarizations up to +550 mV versus free rest potential in the passive state.
DOI: 10.1002/maco.201608855
发表时间: 2016-04
期刊: Materials and Corrosion
影响因子: --
作者:
M. Kosalla;M. Raupach
通讯作者: M. Kosalla;M. Raupach
钢材二次加工过程中“卷入”、“碎片”和“红色”氧化皮形成的特征
DOI: --
发表时间: 2006
期刊:
影响因子: --
作者:
R. Raman
通讯作者: R. Raman