Corrosion of AA2024-T3 Part I: Localised corrosion of isolated IM particles

Boag, A.; Hughés, A.E.; Glenn, A.M.; Muster, Tim H.; McCulloch, D. G.

doi:10.1016/j.corsci.2010.09.009

Cited by 340 publications

(200 citation statements)

References 36 publications

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“…In the specific case of the AA2024 alloy, which has a heterogeneous microstructure composed by intermetallics such as Al-Cu, Al-Cu-Fe-Mn and Al-Cu-Mg [31,32], these copper-rich particles are expected to inhibit the uniform deposition of VTMS/TEOS films onto the alloy.…”

Section: Surface Analysismentioning

confidence: 99%

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

Dalmoro

Santos

Baibich

et al. 2015

Progress in Organic Coatings

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Sol-gel films were prepared using different ratios of two silica precursors, vinyltrimethoxysilane (VTMS) and tetraethylorthosilicate (TEOS), targeting the anticorrosion treatment of aluminum alloy 2024-T3. The electrochemical behavior of the alloy coated with such films, which was studied in a 0.05 mol L -1 NaCl solution, revealed that the VTMS/TEOS ratio drastically affects the anticorrosion performance. Electrochemical impedance spectroscopy (EIS) results provided evidences that the best anticorrosive response occurs with the films prepared from 50% v/v ethanol, 46% v/v water, 3% v/v VTMS and 1% v/v TEOS. Moreover, the effects of the addition of ethylenediamine tetra(methylene phosphonic acid) (EDTPO) to a hybrid sol-gel matrix were examined. The corrosion resistance was considerably improved when the concentration of added phosphonic acid was 3.7510 -5 mol·L -1 . Scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy analyses revealed that EDTPO-containing films provide a more uniform coverage. Results evidenced the formation of Si-O-Al linkages in the VTMS/TEOS and VTMS/TEOS/EDTPO systems and that the VTMS/TEOS/EDTPO system contained P-O-Al linkages. The P-O-Al bonds, combined with the silica network action, may be responsible for the good anticorrosive behavior of the VTMS/TEOS/EDTPO films.

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Section: Surface Analysismentioning

confidence: 99%

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

Dalmoro

Santos

Baibich

et al. 2015

Progress in Organic Coatings

View full text Add to dashboard Cite

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“…It is well known that corrosion process initiate in intermetallic particles, specifically in the S-phase with preferential dissolution of Al and Mg [2,3]. The localized corrosion constitutes the main degradation form of this alloy [2,4,5]. According to some authors the formation of stable pits evolves the cooperative mechanism, by galvanic coupling of intermetallic particles [6].…”

Section: Introductionmentioning

confidence: 99%

The influence of organophosphonic acid and conducting polymer on the adhesion and protection of epoxy coating on aluminium alloy

Dalmoro

Alemán

Ferreira

et al. 2015

Progress in Organic Coatings

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In the present study we compared the beneficial effect on the incorporation of modified silane nanocoating and conducting polymer additive to the adhesion and protection of aluminium surface with epoxy coating. Results proved that the protection imparted by the silane coating, suitably modified with phosphonic groups, showed an excellent adhesion to the metallic substrate as well as good adherence with the epoxy outer layer, which result in an improved corrosion resistance. The incorporation of 1% of poly (3-methyl thiophene acetate) (P3TMA) also improved the adhesion force of the epoxy paint adhered to the aluminium surface. However, the adhesion force decreased with the increase of the immersion time in NaCl 3.5% solution. In conclusion, both bilayer systems [vinyltrimethoxysilane (VTMS)/tetraethylorthosilicate (TEOS) and VTMS/TEOS/ ethylenediaminetetra(methylene phosphonic acid) (EDTPO)] and also the employment of P3TMA in the epoxy coating showed better results in accelerated corrosion assays, i.e. very low blistering formation was observed, compared with control samples based in a monolayer coating directly adhered to the aluminium surface.

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“…During corrosion in neutral aqueous solutions, an increase in the local pH might take place through the reduction of the dissolved oxygen (1) [14,15]:…”

Section: Evaluation Of the Corrosion Protection Of The Coatingsmentioning

confidence: 99%

“…It was observed that the release of MBT from PANI capsules is triggered at pH11. The corrosion process is usually accompanied by pH changes in the local corrosion area; an increase in the local pH can take place during cathodic reaction of reduction of the dissolved oxygen [14,15]. Thus, the local increase of pH due to corrosion process can trigger the release of MBT from the capsules incorporated into the corrosion protective coatings, reducing the rate of corrosion signi cantly.…”

Section: Introductionmentioning

confidence: 99%

pH-Responsive Nanostructured Polyaniline Capsules for Self-Healing Corrosion Protection: The Influence of Capsule Concentration

et al. 2017

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Abstract. Nanostructured hollow polyaniline (PANI) capsules are good candidates for encapsulation of corrosion inhibitors and pH-responsive release when incorporated into organic coatings. In previous studies, the corrosion protection performance of PANI capsules, containing organic inhibitor 2-Mercaptobenzothiazole (MBT), was demonstrated. The present work studies the in uence of capsule concentrations (i.e., 0.3, 1, and 2 wt%) on the corrosion protection properties of the coating system. Anti-corrosion properties of di erent coatings were compared by means of Electrochemical Impedance Spectroscopy (EIS) and Scanning Vibrating Electrode Technique (SVET). MBT loaded PANI capsules in epoxy ester coating on AA2024-T3 substrate allow for a self-healing e ect to be obtained during the corrosion process. The results showed that the concentration of MBT loaded PANI capsules greatly in uences the corrosion protection properties of the coatings, and the best corrosion protection performance was observed for the coating system containing 1 wt% PANI capsules. The impedance value of the scratched area of this coating after 7 days of immersion was one order of magnitude higher than that of the control sample.

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Corrosion of AA2024-T3 Part I: Localised corrosion of isolated IM particles

Cited by 340 publications

References 36 publications

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

The influence of organophosphonic acid and conducting polymer on the adhesion and protection of epoxy coating on aluminium alloy

pH-Responsive Nanostructured Polyaniline Capsules for Self-Healing Corrosion Protection: The Influence of Capsule Concentration

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