Corrosion behavior of AA2024-T3 alloy treated with phosphonate-containing TEOS

Dalmoro, Viviane; Santos, João Henrique Zimnoch dos; Azambuja, Denise Schermann

doi:10.1007/s10008-011-1346-3

Cited by 33 publications

(27 citation statements)

References 50 publications

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“…In our previous work we verified that the silica precursors, vinyltrimethoxysilane (VTMS)/tetraethylorthosilicate (TEOS), when mixed in adequate ratio (3/1) propitiate the suitable balance between hydrophobicity and porosity to be used as anticorrosive barrier and adhesion promoter [20]. We also verified that the incorporation of a catalytic amount of phosphonic acid, ethylenediaminetetra(methylene phosphonic acid) (EDTPO), to silica network promoted the formation of Al-O-P bonds, resulting in a great benefit for silane adhesion and corrosion protection [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 68%

“…For the aluminium alloy treated with silica precursors, the samples was firstly immersed in a 0.05 mol L -1 acetic acid solution for 5 min and washed with distilled water and dried under a hot air stream [23]. Then, the panels were immersed in the starting solutions of silica precursors for 30 minutes, …”

Section: Preparation Of Aa2024 Substrate and Sol-gel Films Depositionmentioning

confidence: 99%

“…Surprisingly, the adhesion reduction was 0% for the system that contains organophosphonic molecules (3VE5/epoxy). It is only possible if these molecules are actuating as an adhesion promoter [19][20][21][22][23][24]. Thus, phosphonic acid has a positive effect on the adhesion of silane coating to the aluminium surface.…”

Section: Adhesion Measurementsmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 68%

Section: Preparation Of Aa2024 Substrate and Sol-gel Films Depositionmentioning

confidence: 99%

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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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“…However, the silica network produced by TEOS exhibited hydrophilic characteristics, which resulted in poor corrosion protection [22]. The main aim of the present study, which represents a significant extension of those previous works, is to evaluate the improvement of the anticorrosive performance of coatings with vinyltrimethoxysilane (VTMS).…”

Section: Introductionmentioning

confidence: 94%

“…Previous studies were devoted to investigate the addition of phosphonic acid onto TEOS, evidencing a remarkable improvement of the corrosion performance for the AA2024 alloy coated with films of such combined system [22,23]. However, the silica network produced by TEOS exhibited hydrophilic characteristics, which resulted in poor corrosion protection [22].…”

Section: Introductionmentioning

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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Deposition and corrosion behavior of silicate conversion coatings on aluminum alloy 2024

Kazemi

Danaee

Zaarei

2014

Materialwissenschaft Werkst

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Potassium silicate was deposited on AA2024 aluminum alloy as environmentally friendly conversion coatings and its corrosion behavior were examined by means of electrochemical impedance spectroscopy, potentiodynamic polarization and surfaces techniques. Potentiodynamic polarization curves show significant decrease in corrosion current density of silicate coated aluminum in NaCl solution. The corrosion resistance was increased with increasing silicate concentration of coating baths. The results indicated that the coating applied from 3 molar silicate baths is more uniform and continuous. The X-ray diffraction (XRD) and energy discharge spectroscopy (EDS) spectra confirm the existence of silicate film on the AA2024 surface. The coating performance was evaluated in acidic and basic NaCl solution and the results show the stability of silicate conversion coating in these solutions.

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Corrosion behavior of AA2024-T3 alloy treated with phosphonate-containing TEOS

Cited by 33 publications

References 50 publications

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

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

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

Deposition and corrosion behavior of silicate conversion coatings on aluminum alloy 2024

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