Electrochemical study of modified non-functional bis-silane layers on Al alloy 2024-T3

Palomino, Luis M.; Suegama, P. H.; Aoki, Idalina Vieira; Montemor, M.F.; Melo, Hercílio Gomes de

doi:10.1016/j.corsci.2008.01.018

Cited by 106 publications

(60 citation statements)

References 23 publications

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“…[17][18][19] Montemor et al 20 reported that addition of ceriumactivated nanoparticles improved the corrosion protection performances of modified silane films, inducing a corrosion inhibition ability. Furthermore, in reference (21), the anticorrosion behavior of a silane layer, modified with Ce ions and/or silica nanoparticles, on aluminum substrate was investigated. The results showed that the addition of these additives to the silane matrix improves the corrosion protection of the coating.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of hydrophobic silane–zeolite coatings for corrosion protection of aluminum substrate

et al. 2014

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The anticorrosive properties of a silanezeolite composite coating applied on a 6061 aluminum substrate was investigated. The composite film, deposited by dip-coating technique, was prepared with different contents of SAPO34 powder (60-90 wt%) with the purpose of evaluating the protective action offered by the zeolite-filled silane matrix. Corrosion protection performance, during immersion in 3.5% NaCl solution, was evaluated by means of a potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS). The coating evidenced good barrier properties and high hydrophobicity. The addition of zeolite in the silane matrix induced, as expected, a reduction of cathodic and anodic current. The zeolite improved the barrier properties of the hybrid sol-gel films, enhancing the resistance to localized corrosion attacks. Better results were observed for the sample with 80 wt% of zeolite filler that evidenced still acceptable protective action after 3 days of immersion in the sodium chloride solution.

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Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of hydrophobic silane–zeolite coatings for corrosion protection of aluminum substrate

et al. 2014

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“…Silane based pretreatments have been developed as promising substitutes for the undesirable chromate and phosphate treatments because of an advantageous combination of environmental compliance, good adhesion, good corrosion protection, and compatibility with variety of interfaces due to its hybrid nature. [7][8][9][10][11][12][13][14][15][16][17] Recently, the concept of functional hybrid coatings via sol-gel process was created, in which there is a classic organic polymeric matrix such as epoxy, acrylic, or polyurethane, permeated with an inorganic chain-based polysilane. [18] These organic-inorganic hybrid materials may be readily prepared and modified with wide variety of combinations of available components, providing different contributions to the properties of the resultant material, which enables changes in mechanical properties, porosity control, and adjust the hydrophilic/hydrophobic balance.…”

Section: Introductionmentioning

confidence: 99%

“…[4] The presence of copper and other intermetallic particles in these alloys make them susceptible to galvanic and/or pitting corrosion in chloride containing media. [5][6][7] Surface pretreatments have been suggested to prevent these types of corrosion and chromate conversion coatings have been applied exhaustively for many years [1][2][3] to improve the adhesion of the organic coating to the metal substrate and overall corrosion resistance of the coated alloy. [4] Considering that hexavalent chromium ion is highly toxic and carcinogenic, its use has been limited or forbidden by health and environmental policies or concerns.…”

Section: Introductionmentioning

confidence: 99%

Influence of cerium ions and shelf‐life of hybrid solution as pretreatment for AA 2024 aluminum alloy on its anticorrosion performance

Bravo-Anagua

Aoki

2015

Surface & Interface Analysis

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This paper proposes the use of an organic-inorganic hybrid GPTMS/TEOS/γ-APS film for pretreatment of AA2024 aluminum alloy and to study the influence of the presence of Ce (III) and Ce (IV) ions and ageing of the hybrid solution. The hybrid synthesis was based in TEOS (tetraethyl orthosilicate) as the inorganic precursor, GPTMS (3-glicidoxypropyltrimethoxy silane) as monomer and coupling agent and γ-APS (gamma-aminopropyltrimethoxysilane) as crosslinking promoter. 400 and 100 ppm of Ce (III) or Ce (IV) ions were added in the hydrolysis solution acidified with acetic acid and allowed to complete the reaction for 72 h. After hydrolysis, the mixture was diluted in the dilution ratios 1 : 3 or 1 : 4 before standing for 60 min polymerize. The hybrid film was applied on AA2024 specimens using a 'dip-coater'. The coated specimens were cured in an oven at 150°C for 1 h. Hybrid films anticorrosion behavior was evaluated by electrochemical impedance spectroscopy and scanning vibrating electrode. It was concluded that the film containing Ce (III) or Ce (IV) ions imparts higher protection to substrate comparing with hybrid films without cerium ions. For short immersion times, hybrid films with Ce (IV) ions for both dilution ratios presented better protective properties. Hybrid film with Ce (III) at dilution ratios 1 : 4 and 1 : 3 presented better corrosion protection and self-healing in 0.1 mol l -1 NaCl solution, and it was indeed better noticed when testing hybrid films after longer times of immersion in the electrolyte. Kinematic viscosity of the hybrid solution has slightly increased in the presence of Ce (IV) for longer shelf-life. Hybrid film thickness increased for longer shelf-life of the hybrid solution.

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“…Among these compounds, organofunctional silanes are most suitable for corrosion protection of various metals and alloys since they provide effective coupling with both metal substrate and organic topcoat [13]. However, silane coatings are likely to be ''passive'' since they act essentially as a physical barrier by hindering the penetration of aggressive species to the metallic substrate, so that doping with small amounts of chemicals is needed to provide inhibition characteristics [14][15][16]. At present, no alternative has proven as reliable as chromate for corrosion protection.…”

Section: Introductionmentioning

confidence: 99%

Characterization and corrosion performance of poly(pyrrole-siloxane) films on commercial Al alloys

Trueba

Trasatti

2009

J Appl Electrochem

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An alternative approach was developed for the surface treatment of as-received commercial aluminium alloys 6082-T6, 5083-H111 and 2024-T3 by using a pyrrole-based silane. One immersion step is sufficient for poly(pyrrole-siloxane) film deposition, with good adhesion and desirable morphological features. The combination in a single coating of polysiloxane linkages, acting as a barrier for aggressive species penetration towards the metal surface, and polypyrrole units manifesting active anodic protection, together with high degree of compactness, explains the significantly improved corrosion protection of the composite film in comparison to simple coatings of polymethylsiloxane and polypyrrole.

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Electrochemical study of modified non-functional bis-silane layers on Al alloy 2024-T3

Cited by 106 publications

References 23 publications

Electrochemical behavior of hydrophobic silane–zeolite coatings for corrosion protection of aluminum substrate

Electrochemical behavior of hydrophobic silane–zeolite coatings for corrosion protection of aluminum substrate

Influence of cerium ions and shelf‐life of hybrid solution as pretreatment for AA 2024 aluminum alloy on its anticorrosion performance

Characterization and corrosion performance of poly(pyrrole-siloxane) films on commercial Al alloys

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