An Electrochemical Impedance Study of the Corrosion Inhibition of a 2024 Aluminum Alloy in Neutral Chloride Solutions

Casenave, Christian; Pébère, Nadine; Dabosi, F.

doi:10.4028/www.scientific.net/msf.192-194.599

Cited by 15 publications

(9 citation statements)

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“…Among the numerous studies concerning the replacement of Cr(VI) for the corrosion protection of structural alloys, such as the 2XXX series, some compounds, such as rare earth salts (mostly cerium) (1)(2)(3)(4)(5)(6)(7)(8)(9) or organic compounds, such as triazole, thiazole derivatives and more recently carbamate derivatives (10)(11)(12)(13)(14)(15)(16), have presented interesting corrosion protection activity. lt was shown that this type of inhibitor acts on the copper-rich par ticles decreasing their cathodic activity.…”

Section: Introductionmentioning

confidence: 99%

“…Among the organic compounds, 8-hydroxyquinoline (8-HQ) and benzotriazole (BTA) were studied as corrosion inhibitors in aque ous solution (10)(11)(12) or encapsulated in reservoirs and added to organic or sol-gel coatings for the corrosion protection of AA2024 (21,22). 8-HQ is known for its chelating properties on different metals (10)(11)(12)23,24) and BTA is well known as a corrosion inhibitor for copper (25 ]. These compounds are generally studied separately.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic effect between 8-hydroxyquinoline and benzotriazole for the corrosion protection of 2024 aluminium alloy: A local electrochemical impedance approach

Marcelin

Pébère

2015

Corrosion Science

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This work is devoted to the corrosion inhibition of the 2024 aluminium alloy(AA2024) in neutral aqueous solution by 8-hydroxyquinoline (8-HQ) and benzotriazole (BTA). First, current-voltage cmves and global electrochemical impedance measurements confirmed that 8-HQ and BTA are two effective corrosion inhibitors for AA2024. Mixing the two compounds led to a synergistic effect for the corrosion protection of the alloy. From the impedance data analysis, it was shown that 8-HQ acted mainly on the aluminium matrix with an additional action of the BTA on the intermetallic particles. Then, to analyse the rote of the inhibitors on thegalvanic coupling between the aluminium matrix and the particles, local electrochemical impedance measurements were performed on a mode! system (Al/Cu couple). lt was shown that in the presence of 8-HQ or BTA atone, the galvanic coupling between copper and aluminium was little reduced white in the presence of both compounds together it was strongly limited. The local impedance results confirmed the specific inhibition of the 8-HQand of the BTA on Al and Cu respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synergistic effect between 8-hydroxyquinoline and benzotriazole for the corrosion protection of 2024 aluminium alloy: A local electrochemical impedance approach

Marcelin

Pébère

2015

Corrosion Science

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“…Therefore, an introduction of environmentally friendly corrosion inhibitors for protective coatings is important. Benzotriazole and its derivatives are among the most effective inhibitors used for protection of metals, especially copper and transition metals (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17). Although benzotriazole is an efficient corrosion inhibitor for these metals, in real environments, such as chloride-containing aggressive media (e.g., seawater), its corrosion-inhibitive performance is not sufficient and combination of corrosion inhibition with passive protection (such as paint coating) is required.…”

Section: Introductionmentioning

confidence: 99%

Halloysite Tubes as Nanocontainers for Anticorrosion Coating with Benzotriazole

Abdullayev

Price

Shchukin

et al. 2009

ACS Appl. Mater. Interfaces

398

256

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Halloysite clay nanotubes were investigated as a tubular container for the corrosion inhibitor benzotriazole. Halloysite is a naturally occurring cylindrical clay mineral with an internal diameter in the nanometer range and a length up to several micrometers, yielding a high-aspect-ratio hollow tube structure. Halloysite may be used as an additive in paints to produce a functional composite coating material. A maximum benzotriazole loading of 5% by weight was achieved for clay tubes of 50 nm external diameters and lumen of 15 nm. Variable release rates of the corrosion inhibitor were possible in a range between 5 and 100 h, as was demonstrated by formation of stoppers at tube openings. The anticorrosive performance of the sol-gel coating and paint loaded with 2-5% of halloysite-entrapped benzotriazole was tested on copper and on 2024-aluminum alloy by direct exposure of the metal plates to corrosive media. Kinetics of the corrosion spot formation at the coating defects was analyzed by the scanning vibrating electrode technique, and an essential damping of corrosion development was demonstrated for halloysite-loaded samples.

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“…These microcapsules filled with the inhibitors were added into a siliconebased commercial organic coating, and applied on aluminum coupons to produce a metal/coating system. These organic compounds are currently investigated for the corrosion inhibition of aluminum alloys when present either in the aqueous solution [35][36][37][38][39][40][41], or encapsulated in reservoirs and added to coatings for corrosion protection [42][43][44][45][46], although each one provides significantly different performances. Thus, high corrosion inhibition efficiencies have been observed for 8HQ on aluminum due to the formation of an insoluble chelate layer of aluminum 8-hydroxyquinolinate [44,[47][48][49][50], whereas BTA is less efficient towards the protection of this metal unless a complete although thin BTA-based layer were formed on the surface [36].…”

Section: Introductionmentioning

confidence: 99%

Use of alumina sludge arising from an electrocoagulation process as functional mesoporous microcapsules for active corrosion protection of aluminum

Santana

Mena

Betancor-Abreu

et al. 2021

Progress in Organic Coatings

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The process of fluoride removal from underground water using the electrocoagulation technique with aluminum electrodes results in the generation of large amounts of drinking-water treatment sludge (DWTS) corresponding to electrocoagulated metal hydroxide sludge (EMHS). EMHS, hazardous for the environment, must be adequately managed from the water treatment plant, causing an additional cost to the process and an environmental impact from its disposal. In this study, the revaluation of the EMHS produced using a laboratory scale electrocoagulation reactor with aluminum was investigated for the manufacture of mesoporous alumina microcapsules (MAMs). The obtained microcapsules have been characterized using X-ray diffractometry (XRD), scanning electron microscopy (SEM), Zeta-potential measurement, thermal gravimetric analysis (TGA), and Brunauer-Emmett-Teller (BET) techniques, allowing them to be classified as mesoporous particles of micro and nanometer dimensions. These particles were used as microcapsules to contain corrosion inhibitors (namely, 8-hydroxyquinoline and benzotriazole), and they were subsequently dispersed in a commercial polymer matrix employed to protect aluminum from the corrosive attack of the environment. The corrosion resistance of the resulting functionalized coatings has been characterized by electrochemical impedance spectroscopy (EIS) in the case of artificially-defective coatings, demonstrating that these MAM's released locally the corrosion inhibitor to effectively heal the damaged area of the metal. The overall study demonstrates that the electrocoagulation sludge can be employed to produce microcapsules for efficient anticorrosion protection of engineering metals.

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An Electrochemical Impedance Study of the Corrosion Inhibition of a 2024 Aluminum Alloy in Neutral Chloride Solutions

Cited by 15 publications

References 0 publications

Synergistic effect between 8-hydroxyquinoline and benzotriazole for the corrosion protection of 2024 aluminium alloy: A local electrochemical impedance approach

Synergistic effect between 8-hydroxyquinoline and benzotriazole for the corrosion protection of 2024 aluminium alloy: A local electrochemical impedance approach

Halloysite Tubes as Nanocontainers for Anticorrosion Coating with Benzotriazole

Use of alumina sludge arising from an electrocoagulation process as functional mesoporous microcapsules for active corrosion protection of aluminum

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