Corrosion Resistance and Mechanism of CSA-OPC Based Repair Materials in Artificial Seawaters

doi:10.11902/1005.4537.2023.101

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (2): 462-470 DOI: 10.11902/1005.4537.2023.101

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Corrosion Resistance and Mechanism of CSA-OPC Based Repair Materials in Artificial Seawaters

LI Guoxin(

), CHEN Huaxiang, WU Yangfan

School of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

Cite this article:

LI Guoxin, CHEN Huaxiang, WU Yangfan. Corrosion Resistance and Mechanism of CSA-OPC Based Repair Materials in Artificial Seawaters. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 462-470.

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Abstract

Several sulfoaluminate cement-ordinary Portland cement-based repair materials (CSA-OPC) were prepared, then their corrosion resistance in artificial seawaters containing NaCl, NaCl+Na₂SO₄, NaCl + Na₂SO₄ + MgCl₂ respectively were assessed via dry-wet cycle test, X-ray diffractometer (XRD) and scanning electron microscopy (SEM). The study focuses on the evolution of mass, compressive strength, bond strength and Cl^- content of the CSA-OPC with the variation of OPC content and corrosion process. The results show that in the test conditions with solutions of NaCl, NaCl + Na₂SO₄, NaCl + Na₂SO₄ + MgCl₂, an appropriate amount of OPC incorporation can significantly improve the corrosion resistance of CSA in artificial seawaters. When the content of OPC is 20%-30%, the mass change, compressive strength, bond strength and Cl^- combination ability of CSA-OPC are the best. The Cl^- infiltrated into the CSA-OPC materials are trapped through the formation of Friedel's salt, while the SO₄^2- may inhibit the combination of Cl^-, and Mg²⁺ may reduce the combination rate of Cl^- by consuming more OH^-.

Key words: ocean tidal area ion coupled erosion repair material sulphoaluminate cement ordinary Portland cement

Received: 04 April 2023 32134.14.1005.4537.2023.101

ZTFLH:

TU525

Corresponding Authors: LI Guoxin, E-mail: liguoxin@xauat.edu.cn

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	WU Yangfan

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.101 OR https://www.jcscp.org/EN/Y2024/V44/I2/462

Table 1 Chemical compositions of CSA and OPC

Table 2 Performance parameters of CSA and OPC

Table 3 Mix proportions of cement mortars

Table 4 Chemical compositions of corrosion solutions

Fig.1 Sampling diagram for the determination of Cl^- content

Fig.2 Mass changes of CSA-OPC system during dry-wet cyclic test for 90 cycles in the corrosion solutions of N (a), N + S (b) and N + S + M (c)

Fig.3 Compressive strengths of CSA-OPC system during dry-wet cyclic test for 90 cycles in the corrosion solutions of N (a), N + S (b) and N + S + M (c)

Fig.4 Bond strengths of CSA-OPC system during dry-wet cyclic test for 90 cycles in the corrosion solutions of N (a), N + S (b) and N + S + M (c)

Fig.5 Total contents of Cl^- for CSA-OPC system during dry-wet cyclic test for 90 cycles in the corrosion solutions of N (a), N + S (b) and N + S + M (c)

Fig.6 Combination rates of Cl^- for CSA-OPC system after dry-wet cyclic test for 90 cycles in the corrosion solutions of N, N + S and N + S + M

Fig.7 XRD patterns of 80%CSA-20%OPC system (a) and 70%CSA-30%OPC system (b) after dry-wet cyclic test for 45 and 90 cycles in the corrosion solutions of N, N+S and N+S+M

Fig.8 Morphologies of 80%CSA-20%OPC system after dry-wet cyclic test for 45 (a) and 90 (b) cycles in NaCl corrosion solution

Fig.9 Morphologies of 80%CSA-20%OPC system after dry-wet cyclic test for 45 (a) and 90 (b) cycles in NaCl + Na₂SO₄ corrosion solution

Fig.10 Morphologies of 70%CSA-30%OPC system after dry-wet cyclic test for 45 (a) and 90 (b) cycles in NaCl + Na₂SO₄ + MgCl₂ corrosion solution

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