Electrochemical Behaviors of Quad-Layer Aluminum Brazing Sheet Composite for Automotive Applications

Shi, Qimin; Feng, Liang; Cheadle, Brian

doi:10.5006/1.3299245

Cited by 17 publications

(15 citation statements)

References 6 publications

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“…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 . This layer provides galvanic protection to the underlaying aluminum alloy and can be produced by several techniques such as the use of Zn‐rich flux, spraying, or surface Zn cladding .…”

Section: Introductionmentioning

confidence: 99%

“…If a Zn compositional depth profile is present in the Zn‐rich layer, a wide range of corrosion potentials can be expected, depending on the Zn content in the matrix. According to the works in literature, a corrosion potential difference of about 25‐30 mV between Zn‐rich layer and the aluminum substrate is considered optimal to adequately protect the substrate …”

Section: Introductionmentioning

confidence: 99%

“…Pech‐Canul et al carried out corrosion tests on the whole heat exchanger and examined the morphology of the Zn‐rich layer after the corrosion tests . Other authors investigated the corrosion behavior of aluminum bulk samples presenting different Zn content . In the first approach, it was possible to determine the overall corrosion resistance of the heat exchanger, demonstrating the galvanic protection provided by the Zn diffusion layer.…”

Section: Introductionmentioning

confidence: 99%

“…In the first approach, it was possible to determine the overall corrosion resistance of the heat exchanger, demonstrating the galvanic protection provided by the Zn diffusion layer. In the second case, it was possible to obtain only a qualitative study of the effect of Zn content without a direct link to the behavior of a heat exchanger. An in‐depth electrochemical investigation of Zn diffusion layers in 3xxx aluminum alloys has not been performed yet.…”

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%

Section: Introductionmentioning

confidence: 99%

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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“…There is a high demand for low cost alloys, while excellent corrosion resistance comparable to that of the expensive LL alloys is required as well [1][2][3][4][5] . Standard AA3003 and AA3005 alloys exhibit poor corrosion resistance 3 , however, they are more cost effective as compared to the LL alloys 3 .…”

Section: Introductionmentioning

confidence: 99%

Improved Corrosion Resistance of Aluminum Brazing Sheet by a Post-Brazing Heat Treatment

Afshar¹,

Tichelaar²,

Glenn³

et al. 2017

CORROSION

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This work studies the influence of the microstructure on the corrosion mechanism and susceptibility of as-brazed aluminum sheet. Various microstructures are obtained using post-brazing heat treatments developed to enhance the corrosion resistance of an AA4xxx/AA3xxx brazing sheet. The heat treatment results in a decrease of the matrix Si content within the heat affected zone (HAZ) and an increase of the Si fraction in the α-Al(Fe-Mn)Si phase. Additionally, the effect of the heat treatment on the local electrochemical activity and corrosion properties are studied. The results indicate that the corrosion susceptibility of the as-brazed structure is diminished due to an amendment of the local electrochemical behavior of the outer clad surface after the post-brazing heat treatment. Moreover, the potential difference between the clad material and core is increased resulting in an improved sacrificial cathodic protection of the core by the resolidified clad layer.

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Furnace Brazing Parameters Optimized by Taguchi Method and Corrosion Behavior of Tube-Fin System of Automotive Condensers

Guía-Tello

Trujillo-Vázquez

Pech‐Canul

2017

J. of Materi Eng and Perform

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Electrochemical Behaviors of Quad-Layer Aluminum Brazing Sheet Composite for Automotive Applications

Cited by 17 publications

References 6 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

Improved Corrosion Resistance of Aluminum Brazing Sheet by a Post-Brazing Heat Treatment

Furnace Brazing Parameters Optimized by Taguchi Method and Corrosion Behavior of Tube-Fin System of Automotive Condensers

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