Electrochemical depth profiling of multilayer metallic structures: An aluminum brazing sheet

Afshar, Fatemeh; Ambat, Rajan; Kwakernaak, C.; Wit, J.H.W. de; Mol, J.M.C.; Terryn, Herman

doi:10.1016/j.electacta.2012.06.023

Cited by 20 publications

(14 citation statements)

References 27 publications

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“…In extruded materials, the size of intermetallic particles is typically below 10 microns. Brazing is employed for joining different components of heat exchangers . In particular, during the brazing process, a surface Zn‐rich layer is usually preferred in order to increase the corrosion resistance of the system .…”

Section: Introductionmentioning

confidence: 99%

“…An in‐depth electrochemical investigation of Zn diffusion layers in 3xxx aluminum alloys has not been performed yet. Al‐Si clads deposited on aluminum 3XXX alloys have been studied by Ashfar et al In this study, radiofrequency glow discharge optical emission spectroscopy (Rf‐GDOES) was employed to expose layers with different Si content for electrochemical characterization using a microcell. The same experimental procedure was also used for the characterization of hot‐dip aluminum‐silicon coatings on steel .…”

Section: Introductionmentioning

confidence: 99%

“…The electrochemical microcell, on the other hand, is widely used to analyze the corrosion behavior of materials on small lateral scale (<1 mm) …”

Section: Introductionmentioning

confidence: 99%

“…Brazing is employed for joining different components of heat exchangers. 1,[5][6][7][8][9][10] In particular, during the brazing process, a surface Zn-rich layer is usually preferred in order to increase the corrosion resistance of the system. 7,[10][11][12][13][14] This layer provides galvanic protection to the underlaying aluminum alloy 7,10 and can be produced by several techniques such as the use of Zn-rich flux, 7 spraying, 10 or surface Zn cladding.…”

Section: Introductionmentioning

confidence: 99%

“…The electrochemical microcell, on the other hand, is widely used to analyze the corrosion behavior of materials on small lateral scale (<1 mm). 8,18,25 The aim of the present work is the study by Rf-GDOES of the Zn profile in extruded bars, with a Zn-rich reactive flux produced in a controlled atmosphere brazing (CAB) process. Craters sputtered by Rf-GDOES were also employed for the investigation of the microstructure and electrochemical behavior of layers with different Zn contents.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural and in‐depth electrochemical characterization of Zn diffusion layers on aluminum 3xxx alloy

Lanzutti

Andreatta

Magnan

et al. 2018

Surface & Interface Analysis

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AA 3XXX alloys are widely used in heating, ventilation, and air conditioning (HVAC) field. Diffusion joining using a filler metal together with flux is employed in some applications as for heat exchangers. In this work, the effect of diffusion of a Zn‐based flux on both microstructure and electrochemical behavior has been investigated. In particular, an AA3xxx was coated with a Zn‐rich flux and subjected to controlled atmosphere brazing (CAB). Glow discharge optical emission spectroscopy (GDOES) composition profiles were acquired in order to determine the Zn distribution in the diffusion layer. The GDOES was also employed to produce a controlled erosion of the surface in order to obtain craters with defined depths in the Zn diffusion layer, in which electrochemical analyses could be performed. The Volta potential maps at different depths in the Zn diffusion layer were obtained by scanning Kelvin probe force microscope (SKPFM). The Zn diffusion layer was also investigated by means of Scanning Electron Microscope‐Energy Dispersive X‐ray Spectroscopy (SEM‐EDXS) and the chemical composition of the phases present in the regions was investigated by SKPFM. Finally, the electrochemical microcell was used in the produced craters in order to determine the electrochemical behavior along the Zn diffusion profile. SKPFM and microcell results showed a correlation between the Zn content and the electrochemical properties. In particular, a higher Zn content in the diffusion layer leads to an increase of the Volta potential difference between the intermetallic particles and the matrix. The electrochemical measurements also showed that the Zn diffusion layer provides galvanic protection to the underlaying aluminum alloy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The electrochemical microcell, on the other hand, is widely used to analyze the corrosion behavior of materials on small lateral scale (<1 mm) …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Microstructural and in‐depth electrochemical characterization of Zn diffusion layers on aluminum 3xxx alloy

Lanzutti

Andreatta

Magnan

et al. 2018

Surface & Interface Analysis

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Effect of Isothermal Heat Treatment at 760 °C on the Oxidation Behavior of Ti-Al-Zr Alloy

Sinha

Kain

2020

Metall Mater Trans A

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This study reports the oxidation behavior of an alpha titanium alloy, Ti-Al-Zr. The alloy was isothermally heat-treated in the air at 760°C for durations up to 700 hours. Heat treatment led to the formation of an oxide layer on the surface and an alpha case beneath the oxide layer. The oxide and the alpha case were characterized by optical microscopy, micro-hardness measurement, scanning electron microscopy (SEM), X-ray diffraction (XRD) and glow discharge optical emission spectroscopy (GDOES). The oxide was predominantly rutile; however, other metal oxides were also present. An oxide growth mechanism has been proposed. An alpha case of a maximum depth of 646 lm was measured for the specimen exposed for 700 hours. The diffusion coefficient of oxygen in the metal matrix was calculated to be 8.83 9 10 À14 m 2 /s. The alpha case formation led to straining of the matrix because of oxygen dissolution. Micro-strain was calculated from XRD measurements using the ''Modified Williamson-Hall (Modified W-H)'' method. A maximum micro-strain of 0.37 pct was calculated for the prismatic plane (110) for a 72 hours exposed specimen. A decreasing trend in the micro-strain value with increasing exposure time has been reported and explained.

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Mechanism of corrosion protection of hot-dip aluminium–silicon coatings on steel studied by electrochemical depth profiling

et al. 2013

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Electrochemical depth profiling of multilayer metallic structures: An aluminum brazing sheet

Cited by 20 publications

References 27 publications

Microstructural and in‐depth electrochemical characterization of Zn diffusion layers on aluminum 3xxx alloy

Microstructural and in‐depth electrochemical characterization of Zn diffusion layers on aluminum 3xxx alloy

Effect of Isothermal Heat Treatment at 760 °C on the Oxidation Behavior of Ti-Al-Zr Alloy

Mechanism of corrosion protection of hot-dip aluminium–silicon coatings on steel studied by electrochemical depth profiling

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