HMMM cured corrosion resistance waterborne ormosil coating for aluminum alloy

Pathak, S.S.; Khanna, A. S.; Sinha, Tanur

doi:10.1016/j.porgcoat.2007.07.014

Cited by 37 publications

(12 citation statements)

References 19 publications

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“…However, it seems there is a cerium concentration threshold (0.1 M) over which the corrosion resistance fails. The coating doped with 0.5 M Ce(NO 3 ) 3 shows the lowest resistance and the highest capacitances at the end of the test period, suggesting that the increase of the cerium concentration promotes the formation of more defective coatings. Moreover, the corrosion resistance is clearly enhanced after 300 s of immersion.…”

Section: Corrosion Resistancementioning

confidence: 98%

“…Introduction Aluminum and its alloys are widely used in aerospace industry because of their low density and mechanical properties. Despite the protective film ((hydro) oxide thin film) formed in moisture conditions, the high reactivity commonly observed drastically increases in contact with solutions containing complexing agents (e.g., halides) [1][2][3][4]. The corrosion process of aluminum involves the adsorption of aggressive ions on the (hydr)oxide aluminum surface (e.g., Cl − ), the dissolution of this protective layer and the direct attack of the metal [5].…”

Section: -4332mentioning

confidence: 99%

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An Auger and XPS survey of cerium active corrosion protection for AA2024-T3 aluminum alloy

Uhart

Ledeuil

Gonbeau

et al. 2016

Applied Surface Science

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Section: Corrosion Resistancementioning

confidence: 98%

Section: -4332mentioning

confidence: 99%

An Auger and XPS survey of cerium active corrosion protection for AA2024-T3 aluminum alloy

Uhart

Ledeuil

Gonbeau

et al. 2016

Applied Surface Science

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“…Irreversible structural changes also affect hydrocarbon chains (possibly also those bonded to Si atoms in silanes), as under UV exposure they are subjected to photo-oxidation, inducing carbonyl and hydroxyl groups formation [27][28][29]. Conversely, silane coatings crosslinked by hexamethoxymethylmelamine resulted stable under UV-exposure [30].…”

Section: Introductionmentioning

confidence: 99%

Organosilane coatings applied on bronze: Influence of UV radiation and thermal cycles on the protectiveness

Chiavari

Balbo

Bernardi

et al. 2015

Progress in Organic Coatings

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a b s t r a c t3-Mercapto-propyl-trimethoxy-silane (PropS-SH) coatings, with or without the addition of three types of oxide particles (CeO 2 (nano-sized), TiO 2 (nano-sized) and La 2 O 3 (micro-sized)), were applied on quaternary bronze (Cu-Sn-Zn-Pb) and tested through natural and artificial exposures. In particular, uncoated and coated samples were exposed both in the coastal town of Rimini (Italy) under sheltered/unsheltered conditions and in a climatic chamber where the samples underwent temperature/UV cycles, at constant humidity. The sample surfaces were periodically characterized by SEM, EDS, micro-Raman, FTIR and XRD techniques. Moreover, during natural exposures, runoff rainwater was collected monthly, in order to evaluate the release of the alloying metals from bronze by atomic absorption spectrometry (AAS). The results showed that micro-scale cracking and spalling phenomena took place during natural exposure, partly limiting the protective efficiency of the organosilane coating. In fact, UV radiation has a strong influence on coating performance, inducing structural modifications of the polymer. Oxide particle-and especially TiO 2 -charged coatings proved to be more resistant to UV degradation.

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“…However, by the addition of amine crosslinking agents it is possible to promote the organic network formation at low temperature [17], with inherent energy savings. The corrosion behaviour of amine-cured epoxy-silane sol-gel coatings has been studied by different authors [14,15,[17][18][19][20][21][22]. The diethylenetriamine (DETA) is one of the most common epoxy crosslinkers used and an optimum amine concentration in terms of the best anticorrosive properties achieved by the coatings was reported by Vreugdenhil et al [18] and by Davis et al [17] of, respectively, 1.3 and 1 relative to the molar ratio "epoxy group/amine reactive hydrogen".…”

Section: Introductionmentioning

confidence: 99%

EIS Study of Amine Cured Epoxy-silica-zirconia Sol-gel Coatings for Corrosion Protection of the Aluminium Alloy EN AW 6063

Fontinha¹,

Salta²,

Zheludkevich³

et al. 2013

Port. Electrochim. Acta

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The organic-inorganic hybrid sol-gel films, the structure of which comprises interconnected inorganic and organic networks have been reported as an environmentally friendly anti-corrosion pre-treatment for several metals, including aluminium alloys. In this paper, an epoxy-silica-zirconia hybrid sol-gel coating was synthesized from glycidoxypropyltrimethoxysilane (GPTMS) and zirconium npropoxide (TPOZ) precursors and applied to EN AW-6063 alloy by dip-coating. To promote the organic network formation through the epoxy group polymerization at room temperature, two types of amine crosslinkers were added during synthesis: diethylenetriamine (DETA), in different concentrations, and a tri-functional aminosilane. The evolution of the curing process and the corrosion behaviour of the coated aluminium alloy specimens were evaluated by Electrochemical Impedance Spectroscopy (EIS) in 0.5 M NaCl. The morphology and surface chemistry of the hybrid coatings were characterized by Energy Dispersive Spectroscopy (EDS) coupled with Scanning Electron Microscopy (SEM) and by Fourier Transform Infrared Spectroscopy (FTIR). The results obtained revealed that the sol-gel coatings with lower amine ratios required longer curing times, but showed the best anticorrosive performance with time. The increase in amine concentration has led to a more cross linked organic network, resulting in higher initial coatings resistance; however it has turned coatings more hydrophilic, prone to rapid degradation in water.

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HMMM cured corrosion resistance waterborne ormosil coating for aluminum alloy

Cited by 37 publications

References 19 publications

An Auger and XPS survey of cerium active corrosion protection for AA2024-T3 aluminum alloy

An Auger and XPS survey of cerium active corrosion protection for AA2024-T3 aluminum alloy

Organosilane coatings applied on bronze: Influence of UV radiation and thermal cycles on the protectiveness

EIS Study of Amine Cured Epoxy-silica-zirconia Sol-gel Coatings for Corrosion Protection of the Aluminium Alloy EN AW 6063

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