Susceptibility to Pitting Corrosion of Pure Aluminium, 2024 Alloy and 6056 Alloy in Chloride-Containing Sulphate Solutions

Blanc, Christine; Lavelle, B.; Mankowski, Georges

doi:10.4028/www.scientific.net/msf.217-222.1559

Cited by 10 publications

(8 citation statements)

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“…This metallic glass films were composed of small crystallites of CeAlO 3 , Al 4 Ce, Al 3 Ce combined with cerium oxides; this composition seems to have significant influence on the preliminary corrosion behavior, inhibiting the cathodic and anodic reactions and increasing impedance values after 1 day of continuous immersion in the aggressive medium. Due to the fact that corrosion in aluminum alloys is a very complex process that can be affected by various factors such as the type of aggressive ion and its concentration, the pH of the media, temperature or structural characteristics of the oxide passive film [1,[15][16][17][18][19][20][21][22][23], an understanding of the characteristics of the proposed films can be a crucial step towards the formulation of effective mitigation strategies. Given that electrochemical impedance spectroscopy (EIS) and XPS are two techniques that provide information on the surface of the material [24], this research work used them to interpret the electrochemical behavior of sputtered Al-Ce coatings during 21 days of exposure in a 3.5 wt% NaCl solution and correlated it with the nature and composition of the deposited films before and after the corrosion product layer was formed on the surface under the experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

XPS and EIS studies of sputtered Al–Ce films formed on AA6061 aluminum alloy in 3.5% NaCl solution

Domínguez‐Crespo¹,

Torres‐Huerta²,

Rodil

et al. 2009

J Appl Electrochem

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X-ray photoelectron spectroscopy (XPS) was used to analyze the composition of films at different deposition parameters of sputtered Al-Ce coatings on AA6061 aluminum alloys. By means of electrochemical impedance spectroscopy (EIS) measurements, the protective character of these coatings was studied for 21 days of exposure in a 3.5 wt% NaCl solution and an attempt was made to establish the relationship between film thickness and chemical composition (Al/Ce, Ce 3 /Ce 4? ratios) of the surface before and after the electrochemical characterization. XPS studies revealed the presence of the Al o , Al 2 O 3 , CeO 2 and Ce 2 O 3 compounds, confirming that the sputtered Al-Ce films were deposited in the metallic form and thereafter were superficially oxidized under ambient conditions. The Al-Ce bonds were overlapped with the signal of cerium oxides. The transport phenomena in the oxide film or controlled diffusion process are strongly dependent on the deposition parameters and exposure time in the aggressive medium. It was also found that in the deposited samples at p 4 P 200 t 300 , the film was still present after 21 days of exposure, although with visible cracks and erosion areas; however, the Ce 3 /Ce 4? ratio almost remained constant before and after the electrochemical characterization, which explained the barrier properties of these samples as compared with others at different deposition parameters.

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Section: Introductionmentioning

confidence: 99%

XPS and EIS studies of sputtered Al–Ce films formed on AA6061 aluminum alloy in 3.5% NaCl solution

Domínguez‐Crespo¹,

Torres‐Huerta²,

Rodil

et al. 2009

J Appl Electrochem

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“…[37][38][39] In the case of AA2024, there are two main types of large constituent particles: A1 2 CuMg particles (S phase) and Fe containing particles. 38-42 A1 2 CuMg particles are usually round in shape while Fe containing particles tend to be irregular in shape.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that the constituent particles in high strength aluminium alloys have a detrimental effect on their corrosion properties. [37][38][39] In the case of AA2024, there are two main types of large constituent particles: A1 2 CuMg particles (S phase) and Fe containing particles. [38][39][40][41][42] A1 2 CuMg particles are usually round in shape while Fe containing particles tend to be irregular in shape.…”

Section: Introductionmentioning

confidence: 99%

“…[37][38][39] In the case of AA2024, there are two main types of large constituent particles: A1 2 CuMg particles (S phase) and Fe containing particles. [38][39][40][41][42] A1 2 CuMg particles are usually round in shape while Fe containing particles tend to be irregular in shape. The composition of the Fe containing particles varies considerably: compositions such as A1 6 (Cu,Fe,Mn) 43 and A1 7 Cu 2 Fe [43][44][45][46] have been observed.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion of a dissimilar friction stir weld joining aluminium alloys AA2024 and AA7010

Jariyaboon¹,

Davenport²,

Ambat³

et al. 2006

Corrosion Engineering, Science and Technology

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The corrosion behaviour of a dissimilar metal friction stir weld between AA2024-T351 and AA7010-T7651 was investigated. Gel visualisation and immersion tests were used to examine the effect of galvanic coupling between the two components. A microelectrochemical cell with a 400 mm diameter glass tip was used to measure the anodic and cathodic reactivities at different positions in the weld region as well as in the base alloys. It was found that the net anodic attack was in the 7010 alloy with the highest susceptibility in the nugget region. The nugget region of 2024 was protected by its high net cathodic reactivity owing to the precipitation of S phase particles.

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“…The susceptibility to localized corrosion of high strength aluminum alloys, such as Al 2024 and 7075, limits their use in the aerospace and automotive industries despite the high specific strength, lightweight and good formability properties compared with steel. [1][2][3][4][5] Numerous studies have been conducted to improve the corrosion resistance of Al alloys using protective coatings. [6][7][8][9][10][11][12] The most widely used commercial coating is clad pure Al coating.…”

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confidence: 99%

Structure and Corrosion Behavior of Sputter Deposited Ce-Al-O Coating on Al 2024-T3 Alloy Substrates

Liu

Huang

Claypool

et al. 2016

J. Electrochem. Soc.

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Deposition of Ce-Al-O coatings on Al 2024-T3 alloy substrates was conducted by magnetron co-sputtering of CeO 2 and Al targets. The incorporation of Al into the CeO 2 film resulted in an amorphous or nanocrystalline structure with binding energy states different from Al, Al 2 O 3 , and CeO 2 . Electrochemical measurements indicated that the amorphous or nanocrystalline Ce-Al-O coating increased the corrosion resistance of bare Al 2024-T3 substrates by more than three orders of magnitude, and exhibited a very different cathodic and anodic protective mechanism compared to Al and CeO 2 coated and as-polished Al 2024-T3 samples. The oxygen reduction cathodic reactions on the Al alloy surface have been significantly suppressed, and the tendency for pitting corrosion of Al alloy substrate has been significantly reduced by the Ce-Al-O coating. The improved corrosion performance is attributed to the unique microstructure and the resulting interaction and redox reactions of the Ce, Al, and O atoms within the Ce-Al-O coatings.

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Susceptibility to Pitting Corrosion of Pure Aluminium, 2024 Alloy and 6056 Alloy in Chloride-Containing Sulphate Solutions

Cited by 10 publications

References 0 publications

XPS and EIS studies of sputtered Al–Ce films formed on AA6061 aluminum alloy in 3.5% NaCl solution

XPS and EIS studies of sputtered Al–Ce films formed on AA6061 aluminum alloy in 3.5% NaCl solution

Corrosion of a dissimilar friction stir weld joining aluminium alloys AA2024 and AA7010

Structure and Corrosion Behavior of Sputter Deposited Ce-Al-O Coating on Al 2024-T3 Alloy Substrates

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