Corrosion Inhibition of Pure Aluminum by Morpholine-Methylene-Phosphonic Acid in Neutral Chloride Solution

Stefenel, M. M.; Vuano, B. M.; Mayer, C.

doi:10.5006/1.3290317

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…The corrosion resistance of aluminum alloy in aggressive environment is not good, as the natural oxide film on aluminum alloy cannot offer sufficient protection against aggressive anions. Therefore, there are several effective anti‐corrosion inhibitors like nitrate, phosphate, phosphonic acids , and other organic molecules , used in dissolved form that can control the metal dissolution either in acidic, in alkaline or in neutral solutions. The presence of chloride ion is a special case as the aluminum is very sensitive for pitting corrosion .…”

Section: Introductionmentioning

confidence: 99%

“…Controversially, the carboxylic, phosphonic, and sulfonic acids form SAM layers only on oxide film of metals. Phosphonic acid SAMs are increasingly used for building thin films due to their ability to form well defined and stable layers on oxide surfaces . As a native oxide film covers almost all engineered metals, the application of organic SAM coatings for corrosion protection is of high technological importance .…”

Section: Introductionmentioning

confidence: 99%

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Inhibition of aluminum alloy corrosion in electrolytes by self‐assembled fluorophosphonic acid molecular layer

Telegdi

Luciano

Mahanty

et al. 2016

Materials & Corrosion

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inhibition of aluminum alloy corrosion in electrolytes by self‐assembled fluorophosphonic acid molecular layer

Telegdi

Luciano

Mahanty

et al. 2016

Materials & Corrosion

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“…Os inibidores, derivados de triazol, adicionados ao revestimento deverão proteger à liga contra a corrosão localizada sendo liberados do revestimento e atuando nas regiões defeituosas, impedindo que se desenvolva a corrosão entre a matriz da liga e os intermetálicos. Já os derivados do ácido fosfônico poderão aumentar a proteção do metal devido à promoção do aumento das propriedades de adesão dos revestimentos orgânicos (KHRAMOV et al, 2006;WANG et al, 2008), bem como, pela formação de camadas auto-organizáveis através da adsorção espontânea sobre a superfície do substrato primordialmente devido à presença de grupamentos químicos derivados de ácido fosfônico (AOKI et al, 2003;STEFENEL;VUANO;MAYER, 2001).…”

Section: Objetivos E Justificativasunclassified

“…No decorrer do ensaio a constante de tempo AF torna-se menos capacitiva e tem seu pico deslocado para frequências mais altas, indicando aumento da capacitância e do número de caminhos condutores através do híbrido como consequência de sua deterioração (YASAKAU et al, 2008;ZHELUDKEVICH et al, 2005 A literatura científica é menos prodiga em artigos científicos onde derivados de ácido fosfônico tenham sido utilizados para a proteção contra a corrosão de ligas de alumínio. Porém, como já discutido no presente trabalho, derivados de fosfonato têm elevada afinidade pela película de óxido formada sobre o alumínio (STEFENEL;VUANO;MAYER, 2001;WANG et al, 2008). No que se refere especificamente ao seu uso com revestimentos híbridos ou em silanos, (KHRAMOV et al, 2006) verificaram que um híbrido produzido com silano funcional de fosfonato e TEOS era efetivo para a proteção contra a corrosão de ligas de Mg. Em seus estudos (SHEFFER et al, 2004) PAPADAKI; DEMADIS, 2009;ROBERTS et al, 2002;SCHNEIDER et al, 1997;WANG et al, 2008;WANGER et al, 1979).…”

Section: Curvas De Polarização Potenciodinâmica -Btah E Ttaunclassified

Avaliação do desempenho de revestimentos híbridos modificados com inibidores no combate à corrosão de ligas de alumínio.

Oliveira¹

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Anticorrosion metals treatments using formulations containing derivatives of hexavalent chromium (Cr 6+) have been standard in the surface treatment industry for many decades. These treatments afford excellent corrosion protection, offer good base for paintings, are inexpensive and relatively easy to apply. Besides, they provide active protection to the substrate due to their selfhealing abilities. However, environmental and health restrictions, made more severe from the end of the eighties, require replacement of these treatments by processes that are environmentally friendly and not aggressive to human health. In this context, the aerospace industry, which is strongly dependent on high strength aluminium alloys, is one of the most heavily affected, as (Cr 6+) compounds are used in several steps of the surface treatment and corrosion protection processes. Within this new reality, the use of hybrid coatings derived from silanes and obtained by the sol-gel process, has emerged as one of the most investigated alternatives to replace the chromate based pre-treatments. These coatings form a compact polymer network on the metal surface providing an effective barrier against aggressive species, they may also be tailored to present compatibility with organic coatings. However they do not exhibit active corrosion protection. In this study the corrosion behavior, in 0.1 M NaCl, of a hybrid coating produced by hydrolysis and condensation of 3glycidoxypropyltrimethoxysilane (GPTMS) and tetraethyl orthosilicate (TEOS) applied on AA2024-T3 alloy was investigated by means of electrochemical impedance spectroscopy (EIS) and analysed by SEM/EDX. Aiming to improve the coatings performances, the hydrolysis solutions were modified by the addition of 0.005 M of triazoles (benzotriazole (BTAH) and tolyltriazole (TTA)) or organophosphates (trimethylene phosphonic acid (ATMP) and 1hydroxyethylidene-1 1-diphosphonic acid (HEDP)) based corrosion inhibitors. The results of the electrochemical tests showed that, although effective for corrosion protection of the alloy, BTAH and TTA adversely impacted the anticorrosive properties of the hybrid coating. In turn, the modification of the hybrid with ATMP or HEDP improved the impedance response of the coating and increased its stability, proving to be a promising approach to enhance the coating performance. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were used to characterize the hybrid modified with organophosphates. With the first technique it was possible to demonstrate the interaction of the inhibitor molecules with the metal surface. Raman spectroscopy results indicated the incorporation of the inhibitors in the coating, being more effective for this purpose than the XPS analysis. However, to demonstrate this process, it was necessary use the concentration of the inhibitors 10 times more than the amount employed in the electrochemical tests.

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Inhibiting effect of some synthesized surfactants from petroleum oils on the corrosion of aluminium in hydrochloric acid solution

Mehdaoui

Khelifa

Aaboubi³

2013

Res Chem Intermed

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Corrosion Inhibition of Pure Aluminum by Morpholine-Methylene-Phosphonic Acid in Neutral Chloride Solution

Cited by 9 publications

References 2 publications

Inhibition of aluminum alloy corrosion in electrolytes by self‐assembled fluorophosphonic acid molecular layer

Inhibition of aluminum alloy corrosion in electrolytes by self‐assembled fluorophosphonic acid molecular layer

Avaliação do desempenho de revestimentos híbridos modificados com inibidores no combate à corrosão de ligas de alumínio.

Inhibiting effect of some synthesized surfactants from petroleum oils on the corrosion of aluminium in hydrochloric acid solution

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