Effect of Citric Acid and Sodium Silicate on Corrosion Behavior of Steel Bars in Magnesium Oxysulfate Cement under Carbonization

ZHOU Shusu, YU Gaoke, XU Zhirui, QIU Yue, FENG Kaile, XUE Tao, BA Mingfang

doi:10.16577/j.issn.1001-1560.2023.0288

2023 , Vol. 56 >Issue 12: 50 - 57

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0288

Effect of Citric Acid and Sodium Silicate on Corrosion Behavior of Steel Bars in Magnesium Oxysulfate Cement under Carbonization

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(School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China)

Received date: 2023-06-25

Revised date: 2023-07-28

Accepted date: 2023-08-30

Online published: 2024-01-08

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Abstract

In order to explore the effects of citric acid (CA) and water glass (SS) on the corrosion behavior of steel bars in modified magnesium oxysulfide (MOS) cement-based materials under carbonization,the corrosion rate and degree of embedded steel bars under carbonization in MOS cementitious materials with CA, SS, and CS (CA and SS in a 1:2 mass ratio) added at 0.5% mass percent of magnesium oxide, respectively, were tested using electrochemical impedance spectroscopy and steel bar corrosion tester. Results showed that under carbonization, the addition of CA reduced the corrosion rate and degree of passivated and depassivated steel bars in MOS cementitious materials. Among them, the single addition of CA had the best rust inhibition effect on the passivated and depassivated steel bars in MOS cementitious materials. The single addition of SS had no rust inhibition effect on the passivated steel bars in MOS cementitious materials, while the addition of CS had a general rust inhibition effect on the depassivated steel bars in MOS cementitious materials, and no significant rust inhibition effect on the passivated steel bars.

Key words： modified MOS cement; electrochemicaltest; steel bar corrosion; chemical additives; carbonization

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ZHOU Shusu, YU Gaoke, XU Zhirui, QIU Yue, FENG Kaile, XUE Tao, BA Mingfang . Effect of Citric Acid and Sodium Silicate on Corrosion Behavior of Steel Bars in Magnesium Oxysulfate Cement under Carbonization[J]. Materials Protection, 2023 , 56(12) : 50 -57 . DOI: 10.16577/j.issn.1001-1560.2023.0288

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