Electrochemical characterisation of aluminium AA7075-T6 and solution heat treated AA7075 using a micro-capillary cell

Andreatta, F.; Lohrengel, M. M.; Terryn, Herman; Wit, J.H.W. de

doi:10.1016/s0013-4686(03)00379-7

Cited by 176 publications

(106 citation statements)

References 21 publications

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“…7,[13][14][15] Andreatta and coworkers 7,14,15 investigated the galvanic coupling between the IMPs and * Electrochemical Society Student Member. * * Electrochemical Society Fellow.…”

Section: 3mentioning

confidence: 99%

“…2 These corrosion pits can act as initiation sites for corrosion fatigue cracks and reduce the fatigue life, which is a significant damage mechanism in aging aircraft structures. 2,3 From a microstructural viewpoint, initiation of localized pitting corrosion is often associated with coarse cathodic intermetallic particles (IMPs), such as Al 7 Cu 2 Fe, Al 3 Fe, Al 2 Cu, and Al 2 CuMg, which are common in 2xxx and 7xxx series Al alloys. [4][5][6][7][8][9] A number of studies have been performed on electrochemical characteristics of these particles.…”

mentioning

confidence: 99%

“…2,3 From a microstructural viewpoint, initiation of localized pitting corrosion is often associated with coarse cathodic intermetallic particles (IMPs), such as Al 7 Cu 2 Fe, Al 3 Fe, Al 2 Cu, and Al 2 CuMg, which are common in 2xxx and 7xxx series Al alloys. [4][5][6][7][8][9] A number of studies have been performed on electrochemical characteristics of these particles. 4,8,9 In general, they act as local cathodes and sustain oxygen reduction at a high rate to drive the pitting corrosion attack at the particle-matrix interface.…”

mentioning

confidence: 99%

“…7,[13][14][15] Andreatta and coworkers 7,14,15 investigated the galvanic coupling between the IMPs and the surrounding matrix phase of AA7075 in the as-quenched, peakaged T6 and over-aged T73 tempers using a micro-capillary cell and scanning Kelvin probe force microscopy (SKPFM). They suggested that the breakdown potential of areas containing the IMPs (Al 7 Cu 2 Fe and (Al,Cu) 6 (Fe,Cu) particles) was associated with the Volta potential difference between the IMPs and the matrix.…”

mentioning

confidence: 99%

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Effect of Cu Content and Aging Conditions on Pitting Corrosion Damage of 7xxx Series Aluminum Alloys

Wang

Huang

et al. 2015

J. Electrochem. Soc.

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The corrosion behavior and microstructure of AA7055 alloy with a high Cu content, and a Cu-free Al-Zn-Mg alloy in various aging conditions were studied. Polarization measurements and ASTM B117 salt-spray exposure were used to assess the corrosion characteristics. Transmission electron microscope and atom probe tomography were used to evaluate the microstructure and the composition of precipitates. The matrix composition of AA7055 changed with aging because of precipitation. Thus, the galvanic relationship between Al 7 Cu 2 Fe particles and the surrounding matrix correspondingly changed, which affected the susceptibility to pitting corrosion attack. The susceptibility to pitting corrosion damage of AA7055 was found to decrease according to: over-aged samples > under-aged samples > peak-aged sample. However, aging had only a small influence on pitting corrosion damage for the Cu-free Al-Zn-Mg alloy. Furthermore, despite the more active breakdown potential of the Cu-free Al-Zn-Mg alloy, this alloy exhibited less severe pitting corrosion damage than AA7055, in particular for the over-aged samples. This was attributed to the weaker galvanic coupling between Al 3 Fe particles and the surrounding matrix. Although Cu in the intermetallic particles is detrimental to pitting resistance, the galvanic effect can be reduced by increasing the matrix Cu content. High-strength precipitation-hardenable aluminum alloys are commonly used for structural components of aircraft due to their high strength-to-density ratio.1 However, they are also very susceptible to pitting corrosion, in particular for Navy aircraft subjected to extended periods of salt water spray and/or salt fog.2 These corrosion pits can act as initiation sites for corrosion fatigue cracks and reduce the fatigue life, which is a significant damage mechanism in aging aircraft structures. 2,3From a microstructural viewpoint, initiation of localized pitting corrosion is often associated with coarse cathodic intermetallic particles (IMPs), such as Al 7 Cu 2 Fe, Al 3 Fe, Al 2 Cu, and Al 2 CuMg, which are common in 2xxx and 7xxx series Al alloys.4-9 A number of studies have been performed on electrochemical characteristics of these particles. 4,8,9 In general, they act as local cathodes and sustain oxygen reduction at a high rate to drive the pitting corrosion attack at the particle-matrix interface. In addition, a few studies have related the precipitate size to metastable and stable pitting corrosion in Al-Cu-Mg and Al-Zn-Mg-Cu alloys.10-13 Ralston et al. 11,12 suggested that there was a critical S-phase precipitate size range from ∼3 -8 nm to trigger pitting events. Aged samples with smaller precipitate size had pitting resistance similar to as-quenched samples. The susceptibility to pitting corrosion was greatly enhanced after prolonged aging to create precipitates larger than this critical size range. Gupta et al. 13 reported that a critical precipitate size existed for a transition in electrochemical behavior of 7xxx series Al alloys. For Cu-rich AA7150, increased ...

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“…7,[13][14][15] Andreatta and coworkers 7,14,15 investigated the galvanic coupling between the IMPs and * Electrochemical Society Student Member. * * Electrochemical Society Fellow.…”

Section: 3mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Effect of Cu Content and Aging Conditions on Pitting Corrosion Damage of 7xxx Series Aluminum Alloys

Wang

Huang

et al. 2015

J. Electrochem. Soc.

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“…In the past decade many KFM studies have also been conducted on a broad range of topics in corrosion science, including research on the corrosion behavior of steel [136][137][138][139][140][141][142][143][144], Al [143], Cu [145][146][147][148], Zn [143,144,[149][150][151][152], alloys based on Al-Mg [153][154][155][156][157][158][159][160][161][162][163][164] and Ti [165], on corrosion protection with rare-earth elements [166] and other inhibitors [167][168][169][170], the effect of conversion coatings [171][172][173][174][175][176], and the effects of heat treatment on material properties [177][178][179]. Yamawaki et al …”

Section: Metalsmentioning

confidence: 99%

Multidimensional electrochemical imaging in materials science

2007

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In the past 20 years the characterization of electroactive surfaces and electrode reactions by scanning probe techniques has advanced significantly, benefiting from instrumental and methodological developments in the field. Electrochemical and electrical analysis instruments are attractive tools for identifying regions of different electrochemical properties and chemical reactivity and contribute to the advancement of molecular electronics. Besides their function as a surface analytical device, they have proved to be unique tools for local synthesis of polymers, metal depots, clusters, etc. This review will focus primarily on progress made by use of scanning electrochemical microscopy (SECM), conductive AFM (C-AFM), electrochemical scanning tunneling microscopy (EC-STM), and surface potential measurements, for example Kelvin probe force microscopy (KFM), for multidimensional imaging of potential-dependent processes on metals and electrified surfaces modified with polymers and self assembled monolayers.

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Micropipette Contact Technique as a Tool to Reveal, Characterize, and Modify Nanopore Electrodes

2013

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This paper reports on the use of a micropipette contact method (MCM) to reveal and characterise single submicrometer‐sized pores randomly distributed within a thin insulating alumina layer (250 nm thickness) that coats a platinum film substrate (Pt/Al2O3). Moveable micropipette probes, with orifice radii of 40–50 μm, filled with electrolyte solutions, are brought in contact with the sample surface to form a microcell and allow electrochemical reactions to be confined within a limited contact region. The aqueous solutions inside the micropipettes contain Ru(NH3)63+ or Ag+ ions and cyclic voltammograms (CVs) are obtained for several locations of 500×500 μm2 above the Pt/Al2O3 sample. The presence of nanoscopic pores is revealed by sigmoidally shaped volatmmograms, which are recorded when Ru(NH3)63+ is used as redox probe. From the steady‐state limiting current and the theoretical equation that applies for recessed microelectrodes, the radius of each platinum disk at the bottom of the pore is evaluated. In this way, pore sizes spanning from about 50 nm to 350 nm are revealed. Similar information is obtained by the use of the MCM with the pipette filled with Ag+ ions. In this case, CVs typical for nucleation and growth of metallic silver are recorded. The volume of a single pore is evaluated from the charge involved in the anodic stripping process of the metal deposited. Potential step measurements and relevant current (I) against time (t) transients allow establishing that only a single nucleus can be grown in each submicometer‐sized pore. Moreover, a diffusion coefficient value of 1.41×10−5 cm2 s−1 for Ag+ is evaluated from the experimental I vs. t1/2 linear plot. Finally, the measurements performed at the Pt/Al2O3 sample are compared with those obtained by using a plain platinum disk electrode 3 mm diameter as substrate for MCM measurements.

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Electrochemical characterisation of aluminium AA7075-T6 and solution heat treated AA7075 using a micro-capillary cell

Cited by 176 publications

References 21 publications

Effect of Cu Content and Aging Conditions on Pitting Corrosion Damage of 7xxx Series Aluminum Alloys

Effect of Cu Content and Aging Conditions on Pitting Corrosion Damage of 7xxx Series Aluminum Alloys

Multidimensional electrochemical imaging in materials science

Micropipette Contact Technique as a Tool to Reveal, Characterize, and Modify Nanopore Electrodes

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