Corrosion Behavior of Steel Rebar in Iron Tailings-based Geopolymers in Saline-Alkali Environment

doi:10.11902/1005.4537.2024.361

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (5): 1371-1380 DOI: 10.11902/1005.4537.2024.361

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Corrosion Behavior of Steel Rebar in Iron Tailings-based Geopolymers in Saline-Alkali Environment

LIU Shuo¹^,², WU Lipeng¹^,²(

), LI Jinglun¹^,², XING Jinzheng¹^,², LI Sai¹^,²

1 Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2 School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

Cite this article:

LIU Shuo, WU Lipeng, LI Jinglun, XING Jinzheng, LI Sai. Corrosion Behavior of Steel Rebar in Iron Tailings-based Geopolymers in Saline-Alkali Environment. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1371-1380.

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Abstract

The corrosion behavior of HPB235 hot rolled round steel rebar buried in iron tailings-based geopolymers in a simulated saline-alkali environment was investigated via electrochemical impedance spectroscopy, corrosion potential and polarization curve methods, so that to clarify the influence of the formular of geopolymers on the electrochemical parameters of the test blocks and the corrosion rate of steel bar. The results show that during the corrosion process by applied electric current, the resistance of the test block increases first and then decreases, indicating that SO $4 2 -$ and Cl^- can increase the compactness of the test block. In conditions with setting solution concentration and applied electric current, the test block with reasonable formular is conducive to the protection and delays the corrosion process of steel bars. The influence of ceramic powder content on the corrosion of steel bars is particularly obvious. By comparing the evolution of the free corrosion potential, corrosion current density I_corr and impedance R_c of the steel bar with test geopolymers block of different formulars, it is found that the test block with low ceramic powder content, high sodium silicate modulus, low alkali content and moderate water binder has better protection effect for the steel bar.

Key words: saline-alkali environment geopolymers rusting of steel bars electrochemistry

Received: 01 November 2024 32134.14.1005.4537.2024.361

ZTFLH:

TU503

Fund: Central Government-Guided Local Science and Technology Development Funding Project(236Z3810G);Hebei Provincial Natural Science Foundation(E2021210136)

Corresponding Authors: WU Lipeng, E-mail: lipengwu@outlook.com

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.361 OR https://www.jcscp.org/EN/Y2025/V45/I5/1371

Fig.1 Particle size distribution of iron tailings powders

Table 1 Chemical compositions of iron tailings and ceramic powders (mass fraction / %)

Table 2 Mix proportions of iron tailings-based geopolymers in orthogonal tests (kg/m³)

Fig.2 Schematic diagram of semi-immersion corrosion testing device

Fig.3 Compressive strengths of test blocks with different ceramic powder contents (a), water-binder ratios (b), alkali con-tents (c) and moduli (d)

Fig.4 SEM image of iron tailings-based geopolymers

Fig.5 EDS results of typical regions marked as spot 30 (a) and spot 32 (b) in Fig.4

Fig.6 CaO-SiO₂-Al₂O₃ ternary diagram

Fig.7 XRD patterns of iron tailings-based geopolymers before and after corrosion in saline-alkali simulated solution

Fig.8 Nyquist curves of test blocks with the ceramic powder contents of 30% (a), 40% (b) and 50% (c) after electrolytic accelerated corrosion for different time

Fig.9 Equivalent circuit diagram of EIS of test blocks after electrolytic accelerated corrosion for different time

Fig.10 R_c values of test blocks with different ceramic powder contents (a), water-binder ratios (b), moduli (c) and alkali contents (d)

Fig.11 Corrosion potentials of test blocks with different ceramic powder contents (a), water-binder ratios (b), moduli (c) and alkali contents (d)

Fig.12 Tafel polarization curves of test blocks with ceramic powder contents of 30% (a), 40% (b) and 50% (c) after electro-lytic accelerated corrosion for different time

Fig.13 Corrosion current densities of test blocks with different ceramic powder contents (a), water-binder ratios (b), moduli (c) and alkali contents (d)

Fig.14 Polarization resistances of test blocks with different ceramic powder contents (a), water-binder ratios (b), moduli (c) and alkali contents (d)

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