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The Effect of Temperatures on the Passivation Behavior of Q235 Steel in the Simulated Concrete Pore Solution

Concrete, especially mass concrete, releases a large amount of heat during the hydration process, resulting in the passivation of reinforcement at high temperatures. However, the passivation study of reinforced concrete is mostly conducted at room temperature, and the influence of temperature on pas...

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Autores principales: Jiang, Haosen, Jin, Zuquan, Zhang, Xiaoying, Qian, Lixing, Zhou, Zhaoliang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9867134/
https://www.ncbi.nlm.nih.gov/pubmed/36676325
http://dx.doi.org/10.3390/ma16020588
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author Jiang, Haosen
Jin, Zuquan
Zhang, Xiaoying
Qian, Lixing
Zhou, Zhaoliang
author_facet Jiang, Haosen
Jin, Zuquan
Zhang, Xiaoying
Qian, Lixing
Zhou, Zhaoliang
author_sort Jiang, Haosen
collection PubMed
description Concrete, especially mass concrete, releases a large amount of heat during the hydration process, resulting in the passivation of reinforcement at high temperatures. However, the passivation study of reinforced concrete is mostly conducted at room temperature, and the influence of temperature on passive film behavior is not clear at present. The passivation film of reinforcing steel directly determines the corrosion resistance of reinforcing steel and affects the service life of reinforced concrete. Herein, the passivation of Q235 steel soaking in simulated concrete pore (SCP) solution at 20 °C, 40 °C, and 60 °C is explored. It is found that the passivation process is divided into two stages, with 24 h as the boundary; within 24 h the passivation was carried out rapidly, and the passive film is in a relatively stable state after 24 h. In addition, the higher the temperature, the faster the passivation. Moreover, under the condition of higher temperatures, more Fe(3+) compounds are produced, and the semiconductor properties of passivated films are more stable. Based on experiments, the passivation mechanism affected by temperature was analyzed in detail.
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spelling pubmed-98671342023-01-22 The Effect of Temperatures on the Passivation Behavior of Q235 Steel in the Simulated Concrete Pore Solution Jiang, Haosen Jin, Zuquan Zhang, Xiaoying Qian, Lixing Zhou, Zhaoliang Materials (Basel) Article Concrete, especially mass concrete, releases a large amount of heat during the hydration process, resulting in the passivation of reinforcement at high temperatures. However, the passivation study of reinforced concrete is mostly conducted at room temperature, and the influence of temperature on passive film behavior is not clear at present. The passivation film of reinforcing steel directly determines the corrosion resistance of reinforcing steel and affects the service life of reinforced concrete. Herein, the passivation of Q235 steel soaking in simulated concrete pore (SCP) solution at 20 °C, 40 °C, and 60 °C is explored. It is found that the passivation process is divided into two stages, with 24 h as the boundary; within 24 h the passivation was carried out rapidly, and the passive film is in a relatively stable state after 24 h. In addition, the higher the temperature, the faster the passivation. Moreover, under the condition of higher temperatures, more Fe(3+) compounds are produced, and the semiconductor properties of passivated films are more stable. Based on experiments, the passivation mechanism affected by temperature was analyzed in detail. MDPI 2023-01-07 /pmc/articles/PMC9867134/ /pubmed/36676325 http://dx.doi.org/10.3390/ma16020588 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Jiang, Haosen
Jin, Zuquan
Zhang, Xiaoying
Qian, Lixing
Zhou, Zhaoliang
The Effect of Temperatures on the Passivation Behavior of Q235 Steel in the Simulated Concrete Pore Solution
title The Effect of Temperatures on the Passivation Behavior of Q235 Steel in the Simulated Concrete Pore Solution
title_full The Effect of Temperatures on the Passivation Behavior of Q235 Steel in the Simulated Concrete Pore Solution
title_fullStr The Effect of Temperatures on the Passivation Behavior of Q235 Steel in the Simulated Concrete Pore Solution
title_full_unstemmed The Effect of Temperatures on the Passivation Behavior of Q235 Steel in the Simulated Concrete Pore Solution
title_short The Effect of Temperatures on the Passivation Behavior of Q235 Steel in the Simulated Concrete Pore Solution
title_sort effect of temperatures on the passivation behavior of q235 steel in the simulated concrete pore solution
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9867134/
https://www.ncbi.nlm.nih.gov/pubmed/36676325
http://dx.doi.org/10.3390/ma16020588
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