Study on the corrosion behavior of polymeric nanocomposite coatings containing halloysite nanotubes loaded with multicomponent inhibitor

Ismail, Norhan Ashraf; Moussa, Abdraman M.; Kahraman, Ramazan; Shakoor, Abdul

doi:10.1016/j.arabjc.2022.104107

Cited by 8 publications

(1 citation statement)

References 55 publications

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“…In the literature, p-nitrobenzoic acid is reported as a compound capable of providing low surface coverage of a carbon steel electrode, and consequently, it exhibits low inhibition of corrosion [36]. Additionally, a surface coverage of 49% for aluminum immersed in NaOH with a content of 100 ppm p-nitro carboxylic acid was reported [37].…”

Section: Electrochemical Analysismentioning

confidence: 99%

Investigating the Corrosion Inhibition Mechanisms of Alkanolammonium Salts: A Case Study with Ethylethanolammonium 4-Nitrobenzoate on Carbon Steel in Saline Solution

Crisan,

Muntean,

Chumakov

et al. 2024

Applied Sciences

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This study explores the potential corrosion inhibition mechanisms of alkanolammonium salts, exemplified by ethylethanolammonium 4-nitrobenzoate (EEA4NB), for carbon steel, utilizing experimental and theoretical methods. The interactions between metal and inhibitor, focusing on adsorption behavior in saline solutions, will be thoroughly investigated. Analysis of potentiodynamic polarization curves and electrochemical impedance spectroscopy reveals that the inhibition efficiency (IE) increases with the rising concentration of EEA4NB, reaching 96% at 5 × 10−3 M. Negative adsorption free energy and a high adsorption equilibrium constant suggest the spontaneous formation of a protective inhibitor layer on the metal surface, effectively blocking reaction sites and reducing the corrosion rate, according to the Langmuir isotherms model. As confirmed by scanning electron microscopy, physical and chemical interactions contribute to the adsorption mechanisms. Quantum chemical calculations explore the relationship between EEA4NB molecular configuration and inhibition efficiencies. The study emphasizes the potential efficacy of alkanolammonium salts, exemplified by EEA4NB, as effective corrosion inhibitors for carbon steel in aggressive environments.

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Section: Electrochemical Analysismentioning

confidence: 99%

Investigating the Corrosion Inhibition Mechanisms of Alkanolammonium Salts: A Case Study with Ethylethanolammonium 4-Nitrobenzoate on Carbon Steel in Saline Solution

Crisan,

Muntean,

Chumakov

et al. 2024

Applied Sciences

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Confinement of Lauric Acid into the Lumen of Halloysite Nanotubes

Obele,

Barroso‐Bujans

2024

Part & Part Syst Charact

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Molecules confined within nanometer‐scale environments frequently exhibit a distinct physical response in contrast to those found in bulk conditions. In this study, intercalates of lauric acid (LA) are synthesized within halloysite nanotubes (HNT), successfully trapping 12 wt.% of LA within the internal HNT tube, as demonstrated by transmission electron microscopy (TEM), and wide‐angle and small‐angle X‐ray scattering (WAXS/SAXS) techniques. Furthermore, it is noted that the confinement of LA within the HNT lumen resulted in a significant reduction in LA crystallinity, consistent with the impact of geometric constraints on crystallization behavior. The presence of a significant amorphous phase in the intercalates proved beneficial for the gradual release of LA into water, as evidenced by pH changes. Remarkably, the necessity of employing a vacuum method and extended contact time (72 h) for the physical entrapment of LA in ethanol within the HNT lumen is found to be unnecessary, as similar physical characteristics are observed in an intercalate generated without vacuum and with very short contact time (<1 h). Finally, it is observed that the source of HNT is crucial in determining the final properties of the confined material.

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