Characterization of anodized and sealed aluminium by EIS

Suay, J.; Giménez, Enrique; Rodriguez, Teddy; Habbib, K; Saura, J. J.

doi:10.1016/s0010-938x(02)00137-3

Cited by 121 publications

(71 citation statements)

References 12 publications

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“…The two samples were a tin-plated carbon steel and an aluminum-1100 metal strips. The 1.0M and 1.5M NaCl electrolytes used in the experiments were prepared by pouring 1000cm 3 solution, and 87.75grams of NaCl salt was dissolved in 1.0 liter distilled water for the 1.5M NaCl solution. The solutions were stirred until the salt particles were completely dissolved before use.…”

Section: Methodsmentioning

confidence: 99%

“…Z ', ohm 6,000 5,000 4,000 3,000 2,000 1,000 0 -Z '', ohm 3 When the electrolyte concentration was increased from 1.0 M to 1.5 M NaCl solution, the complex plane plots for both the tin-plated steel and aluminum displayed two time-constants after 3 days, as shown in Figures 8 and 9 respectively. The experimental data plot for the tinplated sample now shows a straight line at about 45 o angle at low frequencies.…”

Section: Unknowntxt Model : R(q(r(cr))) Wgt : Modulusmentioning

confidence: 98%

“…EIS is now the method of choice for characterizing any system in which the electrical behavior is dependent on several different physico-chemical processes occurring on material surfaces at different rates [1]. It also has the advantage of allowing the rapid determination of the corrosion rate of a sample without requiring long-term testing [2,3,4].…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Behavior of Tin-Plated Carbon Steel and Aluminum in NaCl Solutions Using Electrochemical Impedance Spectroscopy

Oni¹,

Egiebor²,

Ekekwe³

et al. 2008

JMMCE

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Section: Methodsmentioning

confidence: 99%

Section: Unknowntxt Model : R(q(r(cr))) Wgt : Modulusmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Corrosion Behavior of Tin-Plated Carbon Steel and Aluminum in NaCl Solutions Using Electrochemical Impedance Spectroscopy

Oni¹,

Egiebor²,

Ekekwe³

et al. 2008

JMMCE

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“…Con respecto a la condición (D1), se pudo notar un menor desempeño contra la corrosión, lo cual se corrobora por un valor de Icorr semejante al obtenido para el sustrato (AA8011), así como también por el grave deterioro superficial presentado, el cual se debe a una mayor facilidad en la salida de iones Al +3 , y un relativo fácil ingreso de los iones O −2 en el proceso de formación de la capa anódica, lo que origina que no se alcance un espesor, y características protectoras adecuadas, así como también a la porosidad presente en esta condición de anodizado y cuyo mecanismo fue reportado por Suay et al, [15].…”

Section: A1unclassified

Desempeño Ante La Corrosión Y Tribocorrosión De Aleaciones Comerciales De Aluminio Anodizadas

Rodriguez

López

et al. 2016

ings

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Recibido: 21-09-2016, aprobado tras revisión: 27-10-2016 Forma sugerida de citación: Rodríguez, S.; Carrasquero, E.; López, L. y Fajardo, J. (2016). «Desempeño ante la corrosión y tribocorrosión de aleaciones comerciales de aluminio anodizadas». Ingenius. N.• 16, (Julio-Diciembre). pp. 64-72. ISSN: 1390-650X. Resumen AbstractEl presente trabajo muestra la evaluación del desempeño de dos aleaciones comerciales de aluminio anodizadas ante la corrosión y tribocorrosión. Para el anodizado se emplearon dos tipos de electrolitos distintos (H 2 SO 4 y H 2 C 2 O 4 ), un valor constante de densidad de corriente y dos tiempos de anodizado (30 y 45 minutos). Usando una de las técnicas de microscopía electrónica de barrido (MEB) y espectroscopía por dispersión de la energía de rayos X (EDX) se caracterizaron las aleaciones y la morfología de las superficies formadas en las capas de óxido para las condiciones establecidas. Se encontraron diferencias notables entre la condición de anodizado (A1) a 45 minutos en H 2 SO 4 para la aleación AA6061, y la condición de anodizado (D1) para el mismo tiempo en H 2 C 2 O 4 para la aleación AA8011. En la condición de anodizado (A1) se encontró la formación de la morfología tipo smudge distintiva de la solución electrolítica utilizada, con un espesor promedio de capa anódica de 5,95 ± 0,02 µm, mientras que, para la condición de anodizado (D1) se obtuvo un espesor de 3,14 ± 0,02 µm, con la aparición de cavidades en toda la extensión de su superficie.In this work were studied two commercial anodized aluminum alloys under conditions of corrosion and tribocorrosion. For two different types of anodizing electrolyte (H 2 SO 4 and H 2 C 2 O 4 ), a constant value of current density and two anodizing time (30 and 45 minutes) were used. Using techniques of Scanning Electron Microscopy (SEM) with Spectroscopy Energy Dispersive X-Ray (EDS) coupled, were characterized the alloys and morphologies of the surfaces formed in the oxide layers. Results obtained show large differences between the condition of anodized (A1) in sulfuric acid for 45 minutes in AA6061 alloy and anodized condition (D1) for the same time in oxalic acid for alloy AA8011. For sample (A1), the results reveals the formation of a morphology named "smudge" which is characteristic of the electrolytic solution used and for this case the average thickness was 5,95 ± 0,02 µm. For sample (D1), the average thickness was 3,14 ± 0,02 µm and revealing the generation of cavities along all surface area. 64 Rodríguez et al. / Desempeño ante la corrosión y tribocorrosión de aleaciones comerciales de aluminio anodizadas 65Tanto para los ensayos de corrosión en cámara de niebla salina, electroquímicos de polarización potenciodinámica y tribocorrosión, se encontró que el mejor desempeño fue registrado en la condición de anodizado (A1), con una menor ganancia promedio de masa, densidad de corriente de corrosión y coeficiente de fricción. Todas las condiciones de anodizado mejoraron el comportamiento ante ensayos de degradación acelerada, en comparación ...

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“…The sealing is a cost-effective and simple post-treatment that provides the closure of micro pores and micro cracks in order to hinder the migration of the corrosive media through the alumina coating. [16][17][18][19][20] The present study is aimed at improving the corrosion resistance of MAO formed alumina coating by a simple sealing post-treatment. The sealing treatment was performed by immersion in a hot stearic-acid-containing solution.…”

Section: Introductionmentioning

confidence: 99%

Formation of a corrosion-resistant alumina coating on a 6061 aluminum alloy using a combination of micro-arc oxidation and sealing treatments

Paksoy¹,

Muhaffel²,

Koca³

et al. 2017

Mater. Tehnol.

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Micro-arc oxidation (MAO) is an attractive process for the fabrication of protective coatings on aluminum alloys used in many industrial applications, such as automotive, structural and aerospace. However, improvements in the corrosion resistance of aluminum alloys upon covering their surfaces with MAO coating may not be sufficient for extending the service life of the components utilized in harsh environments. In the present study, the MAO coating formed on a 6061 aluminum alloy was sealed using a stearic acid treatment. In the scope of the present study, the surface and cross-sectional microstructures and the phases of the MAO coatings were analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques, respectively. The wettability and surface roughness of the samples were measured by goniometer and profilometer, respectively. The corrosion resistance was assessed by long-term immersion in 3.5 % of mass fractions NaCl solution. Finally, it is concluded that sealing of the MAO coating by stearic acid treatment significantly improved the corrosion resistance of the 6061 quality aluminum alloy as compared to the untreated state and the unsealed MAO state. Keywords: aluminum alloy, micro-arc oxidation, ceramic coating, sealing, corrosion.Oksidacija v mikroobloku (MAO) je zanimiv postopek za izdelavo za{~itnih nanosov na aluminijevih zlitinah, ki se jih uporablja v {tevilnih industrijah, kot je avtomobilska, gradbeni{tvo in letalstvo. Vendar pa izbolj{anje korozijske odpornosti aluminijevih zlitin po prekritju z MAO nanosom ni dovolj veliko za podalj{anje zdr`ljivosti komponent, ki se jih uporablja v kislih okoljih. V {tudiji je bila plast MAO, ki je nastala na zlitini aluminija 6061, zatesnjena z obdelavo s stearinsko kislino. V okviru te {tudije, so bile analizirane povr{ine in mikrostrukture preseka in faze v MAO nanosu, s pomo~jo elektronske vrsti~ne mikroskopije (SEM) in z rentgensko difrakcijo (XRD). Omo~ljivost in hrapavost povr{ine vzorcev sta bili izmerjeni z goniometrom in s profilometrom. Korozijska odpornost je bila dolo~ena z dolgotrajnim namakanjem v 3,5 % raztopini NaCl. Ugotovljeno je bilo, da tesnjenje MAO nanosa z obdelavo v stearinski kislini, mo~no izbolj{a korozijsko odpornost aluminijeve zlitine 6061 v primerjavi z neobdelanim stanjem ali z nezatesnjenim MAO.

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Characterization of anodized and sealed aluminium by EIS

Cited by 121 publications

References 12 publications

Corrosion Behavior of Tin-Plated Carbon Steel and Aluminum in NaCl Solutions Using Electrochemical Impedance Spectroscopy

Corrosion Behavior of Tin-Plated Carbon Steel and Aluminum in NaCl Solutions Using Electrochemical Impedance Spectroscopy

Desempeño Ante La Corrosión Y Tribocorrosión De Aleaciones Comerciales De Aluminio Anodizadas

Formation of a corrosion-resistant alumina coating on a 6061 aluminum alloy using a combination of micro-arc oxidation and sealing treatments

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