Influence of Aging on Corrosion Behaviour of the 6061 Cast Aluminium Alloy

Ting He; Wei Shi; Song Xiang; Chaowen Huang; Ronald G Ballinger

doi:10.3390/ma14081821

Influence of Aging on Corrosion Behaviour of the 6061 Cast Aluminium Alloy

Materials (Basel). 2021 Apr 7;14(8):1821. doi: 10.3390/ma14081821.

Authors

Ting He^{1

2}, Wei Shi^{1

2}, Song Xiang^{1

2

3}, Chaowen Huang^{1

2}, Ronald G Ballinger³

Affiliations

¹ College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China.
² Key Laboratory for Mechanical Behavior and Microstructure of Materials of Guizhou Province, Guizhou University, Guiyang 550025, China.
³ H.H. Uhlig Corrosion Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Abstract

The influence of AlFeSi and Mg₂Si phases on corrosion behaviour of the cast 6061 aluminium alloy was investigated. Scanning Kelvin probe force microscopy (SKPFM), electron probe microanalysis (EPMA), and in situ observations by confocal laser scanning microscopy (CLSM) were used. It was found that Mg₂Si phases were anodic relative to the matrix and dissolved preferentially without significantly affecting corrosion propagation. The AlFeSi phases' influence on 6061 aluminium alloy local corrosion was greater than that of the Mg₂Si phases. The corroded region width reached five times that of the AlFeSi phase, and the accelerating effect was terminated as the AlFeSi dissolved.

Keywords: AlFeSi; As-cast 6061 aluminium alloy; Mg2Si; localised corrosion.

Abstract

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