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Improved corrosion inhibition of calcium disodium EDTA for mild steel in chloride-contaminated concrete pore solution
Abstract The corrosion inhibition of EDTA-Ca for mild steel in chloride-contaminated concrete pore solution, with EDTA-Na as comparison, was investigated via several electrochemical methods and surface characterizations. Results show that corrosion inhibition efficiency of EDTA-Ca is higher than that of EDTA-Na. Corrosion inhibition efficiency increased with an increase in EDTA-Ca concentration while decreased with the increased EDTA-Na concentration. EDTA-Ca adsorbs physiochemically on surface of mild steel which obeys Langmuir isotherm, while adsorption of EDTA-Na is physical obeying Freundluich isotherm. A much thinner and more compact oxide film with higher Fe2+ content formed in the presence of EDTA-Ca compared to EDTA-Na. The availability of coordinate bonds for chelation in EDTA-Ca or EDTA-Na plays a critical role in determining the corrosion inhibition efficiency.
Highlights Enhanced corrosion inhibition of EDTA-Ca than EDTA-Na for mild steel in concrete pore solution was obtained. Inhibition efficiency of EDTA-Ca increased with increased concentration. EDTA-Na adsorbs physically while adsorption of EDTA-Ca is physicochemical. EDTA-Ca possibly favours formation of insoluble EDTA-Ca-Fe(II) complexes on steel.
Improved corrosion inhibition of calcium disodium EDTA for mild steel in chloride-contaminated concrete pore solution
Abstract The corrosion inhibition of EDTA-Ca for mild steel in chloride-contaminated concrete pore solution, with EDTA-Na as comparison, was investigated via several electrochemical methods and surface characterizations. Results show that corrosion inhibition efficiency of EDTA-Ca is higher than that of EDTA-Na. Corrosion inhibition efficiency increased with an increase in EDTA-Ca concentration while decreased with the increased EDTA-Na concentration. EDTA-Ca adsorbs physiochemically on surface of mild steel which obeys Langmuir isotherm, while adsorption of EDTA-Na is physical obeying Freundluich isotherm. A much thinner and more compact oxide film with higher Fe2+ content formed in the presence of EDTA-Ca compared to EDTA-Na. The availability of coordinate bonds for chelation in EDTA-Ca or EDTA-Na plays a critical role in determining the corrosion inhibition efficiency.
Highlights Enhanced corrosion inhibition of EDTA-Ca than EDTA-Na for mild steel in concrete pore solution was obtained. Inhibition efficiency of EDTA-Ca increased with increased concentration. EDTA-Na adsorbs physically while adsorption of EDTA-Ca is physicochemical. EDTA-Ca possibly favours formation of insoluble EDTA-Ca-Fe(II) complexes on steel.
Improved corrosion inhibition of calcium disodium EDTA for mild steel in chloride-contaminated concrete pore solution
Liu, Zhicheng (author) / Zhang, Fengrui (author) / Li, Xuan (author) / Wang, Danqian (author)
2023-04-11
Article (Journal)
Electronic Resource
English
Steel Corrosion in a Chloride Contaminated Concrete Pore Solution with Low Oxygen Availability
| Springer Verlag | 2011
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