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Journal of Materials Science

Erschienen in:

30.11.2020 | Metals & corrosion

Gradient multilayer aluminium sheets used in automotive heat exchangers

verfasst von: Zhipeng Yuan, Yiyou Tu, Ting Yuan, Yaohua Huang, Yunhe Zhang

Erschienen in: Journal of Materials Science | Ausgabe 8/2021

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Abstract

The local electrochemical measurement and corrosion mechanism of the multi-layer aluminium sheets (AA4343/AA3xxx/AA4343 and AA7072/AA3xxx/AA4343) after brazing are determined by a combination of mechanical polishing and work function calculation based on density functional theory. The work functions of (100), (110), and (111) crystal planes of Si and α-Al(Fe,Mn)Si particles which are common in multi-layer aluminium sheets are calculated. The results demonstrate Si and α-Al(Fe,Mn)Si particles are considered to be cathodic with respect to the Al matrix, thus promoting cathodic reactions. The potential differences between the Si and α-Al(Fe,Mn)Si particles with respect to the Al matrix may lead to localized dissolution of the Al matrix. Besides, the microstructure and composition of multi-layered aluminium sheets are studied by optical microscopy, scanning electron microscopy, and glow discharge optical emission spectrometry and compared with those obtained for conventional multi-layer aluminium sheets (AA4343/AA3xxx/AA4343). The presence of the AA7072 layer reduces the outward diffusion of copper. In addition, the AA7072 sacrificial layer exhibits a large potential difference against the core material for a long time, thereby improving corrosion protection.

Vorheriger Artikel High impact resistance of a TWIP β titanium alloy: linking the multi-scale deformation and fracture mechanisms

Nächster Artikel Fabrication of superhydrophobic composite coating of hydroxyapatite/stearic acid on magnesium alloy and its corrosion resistance, antibacterial adhesion

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Titel: Gradient multilayer aluminium sheets used in automotive heat exchangers
verfasst von: Zhipeng Yuan
Yiyou Tu
Ting Yuan
Yaohua Huang
Yunhe Zhang
Publikationsdatum: 30.11.2020
Verlag: Springer US
Erschienen in: Journal of Materials Science / Ausgabe 8/2021
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-020-05584-5

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