A synergistic combination of tetraethylorthosilicate and multiphosphonic acid offers excellent corrosion protection to AA1100 aluminum alloy

Dalmoro, Viviane; Santos, João Henrique Zimnoch dos; Armelín, Elaine; Alemán, Carlos; Azambuja, Denise Schermann

doi:10.1016/j.apsusc.2013.02.131

Cited by 65 publications

(44 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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: 75%

See 1 more Smart Citation

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 75%

“…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%

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…We assumed that the phosphorus forms stable Al-O-P linkages. A mechanism for the deposition of phosphonic acid/silica onto aluminum alloy was proposed in previous work [48]. …”

Section: Xps Analysis Of Aa2024 Coated With Vtms/teos (3v) and Vtms/tmentioning

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…This time constant at high frequency is related to the properties of the oxide aluminum barrier layer and the process at low frequency suggests a controlled mass transfer process transport through the pores of pits and/or of corrosion products [21].…”

Section: Electrochemical Impedance Measurementsmentioning

confidence: 99%

Anthocyanins as a corrosion inhibitor for 2024-T3 aluminum alloys: a study of electrochemical behavior

2017

Int. J. Corros. Scale Inhib.

View full text Add to dashboard Cite

Grape anthocyanin efficiency as a corrosion inhibitor for 2024-T3 aluminum alloy was evaluated by electrochemical techniques such as, electrochemical impedance spectroscopy and cathodic and anodic potentiodynamic polarization. The inhibitor behavior for 2024-T3 aluminum alloy was investigated in 800, 1000, 2000, 3000, 5000 and 7200 ppm of the grape anthocyanin solution in the presence of 0.025 mol·L -1 NaCl. According to electrochemical impedance spectroscopy results, the measured point dispersion in the low frequencies region decreased when the 2024-T3 aluminum alloy immersion time in the grape anthocyanin solution increased from 1 h to 3 days. It was also observed for samples after 3 days immersion that there was a reduction in the inductive behavior in the same region, and a considerable increase in the polarization resistance and inhibition efficiency for the 1000 ppm grape anthocyanin sample. Under anodic and cathodic polarization a generally better performance was also observed in the anticorrosive properties as potential and current corrosion and anti-corrosion protection efficiency for the above mentioned concentration sample. The grape anthocyanin adsorption characteristics, on the AA2024-T3 indicated similar behavior to Langmuir isotherm.

show abstract

A synergistic combination of tetraethylorthosilicate and multiphosphonic acid offers excellent corrosion protection to AA1100 aluminum alloy

Cited by 65 publications

References 42 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

Anthocyanins as a corrosion inhibitor for 2024-T3 aluminum alloys: a study of electrochemical behavior

Contact Info

Product

Resources

About