CONSTRUCTION AND BUILDING MATERIALS
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2019
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IF 4.046
Heng Yang,Weihua Li,Xiaoyan Liu,Ang Liu,Peng Hang,Rui Ding,Tianyu Li,Yumei Zhang,Wei Wang,Chuansheng Xiong
Corrosion inhibitor loaded zeolites (inhibitor-loaded ZEO) were prepared and developed for corrosion inhibition of carbon steel in simulated concrete pore solution containing 3.5%NaCl (Cl-SCPS). SEM, EDS, and FTIR were applied to characterize the inhibitor-loaded ZEO. Elemental analysis (EA) and total organic carbon (TOC) methods were used to analyze the inhibitor loading and releasing processes in zeolite. OCP, EIS and polarization tests were carried out. After 336 h, the OCP of DIA-ZEO was higher than that of pure DIA. EIS fitting results show the corrosion inhibition efficiency of DIA-ZEO is about 2% higher than that of pure DIA after 336 h. The results of polarization test are basically consistent with those of EIS, which indicates that DIA-ZEO prolong the long-term effectiveness of DIA. Furthermore, DIA-ZEO reduces the amount of inhibitor added by nearly 30% compared with pure DIA. This may be due to the controlled release of inhibitors by zeolite boosting the formation of denser protective film on the surface of carbon steel.
研究领域:
材料科学
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腐蚀工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Building Engineering
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2024
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IF 6.7
Jiaqi Liu,Meiyan Hang,Minghui Jiang,Guangfei Xu,Hongbin Song
In this research, aiming to deal with the accelerated corrosion deterioration of steel reinforcement in reinforced concrete in harsh environments, a highly efficient rust inhibitor (triethanolamine (TEA)-triisopropanolamine (TIPA)) (abbreviated as TT), which TEA and TIPA compounded in a ratio 4:6, was proposed. The synergistic rust inhibition effect of TEA and TIPA on steel in the simulated concrete pore solution (SCPS), and its corrosion inhibition performance were investigated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), dry and wet cycling, and scanning electron microscopy (SEM) measurements. The results showed that TT inhibitor could obviously inhibit the corrosion of steel in the SCPS and could inhibit both cathode and anode. The electrochemical corrosion inhibition performance was the most excellent at the dosage of 1.0 %, and the maximum corrosion inhibition efficiency ( η 1 ) reached 95.39 %. After 150 times of dry and wet cycling, the percentage of the corrosion area ( S ), and corrosion inhibition efficiency ( η 2 ) with 1.0 % TT inhibitor were 9.3 % and 84.03 %, respectively, and the mass loss rate ( M ) decreased by 68.4 %, indicating a better rust inhibition performance. The adsorption of the TT inhibitor conformed to the Langmuir adsorption isotherm and inhibited the corrosion of steel by forming a protective film on steel surface through physicochemical adsorption. This study is of great significance to provide new perspectives and improvement measures to build up the deterioration and extend the service life of reinforced concrete in harsh environments.
研究领域:
土木工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Heliyon
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2024
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IF 3.4
Yuanyuan Meng,Shuangxi Li,Zhi Zhang
Corrosion inhibitors play a vital role in impeding the corrosion process of steel bars within concrete structures exposed to corrosive environments. Nevertheless, conventional corrosion inhibitors pose environmental risks. In contrast, contemporary studies have explored corrosion inhibitors that are eco-friendly. However, these inhibitors are burdened by high costs and complex production processes, impeding the widespread application in concrete structures. Consequently, this study presents an innovative solution by incorporating uniconazole, an agricultural fungicide, as a corrosion inhibitor for steel bars in concrete structures. The steel bars were exposed to corrosion within a simulated concrete pore solution containing 0.6 mol/L NaCl, both with and without the presence of uniconazole. The morphology and hydrophilicity of the steel bar surface were investigated via optical microscope and contact angle experiments. Electrochemical tests (open circuit potential, potentiodynamic polarization, electrochemical impedance spectroscopy, and Mott-Schottky analysis) and X-ray photoelectron spectroscopy were employed to investigate the corrosion inhibition performance and mechanism of uniconazole. The results demonstrate that uniconazole elevates the hydrophobicity and contributes to the corrosion inhibition of steel bars. Electrochemical test results indicate that as the concentration of uniconazole increases from 1 × 10 −4 mol/L to 1 × 10 −3 mol/L, the inhibition efficiency likewise demonstrates a corresponding increase, escalating from around 50 %–90 %. Uniconazole molecules function as mixed-type inhibitors, exhibiting characteristics of both anode-type and cathode-type inhibitors. The adsorption of uniconazole enhances the stability and thickness of the passive-adsorbed layer on the steel surface, effectively impeding the charge transfer process and obstructing the interaction of corrosive substances with the base metal. In summary, the application of uniconazole exhibits the highlights of efficient, cost-effective, environmentally friendly, and the potential for scalable production. This positions uniconazole as a promising candidate for use as a corrosion inhibitor in the domain of concrete structures.
研究领域:
土木工程
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CEMENT AND CONCRETE RESEARCH
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2021
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IF 10.933
Peihua Zhong,Zhangli Hu,Michele Griffa,Mateusz Wyrzykowski,Jiaping Liu,Pietro Lura
This paper examines the mechanisms of desorption within cement pastes for superabsorbent polymers (SAP) with different sorption kinetics: retentive and non-retentive (self-releasing). Despite the different behavior in solution, both SAP types mitigated the autogenous shrinkage of cement pastes. 1 H NMR and X-ray tomography showed that the cavities formed by both SAP types were saturated until 9–11 h after mixing, while the entrained water in the cavities redistributed to the cement matrix afterwards. In particular, the non-retentive SAP might have rapidly released the absorbed water, but the released water stayed in the original cavities. Therefore, the behavior of the SAP in the pore solution may not completely determine their internal curing performance in cement pastes. In particular, the initial absorption that forms the solution-filled cavities might be more important than whether the SAP are able to retain the solution for extended periods of time or not.
研究领域:
材料科学
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土木工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）