Quasi-continuous-wave laser surface melting of aluminium alloy: Precipitate morphology, solute segregation and corrosion resistance

[Display omitted] •Fine and isolated Cu-rich precipitate is obtained by quasi-continuous wave laser surface melting.•The sub-micron sized discrete precipitates are beneficial to pitting corrosion resistance.•Coarse interconnected precipitates are preferred sites for pitting initiation and propagatio...

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Bibliographic Details
Published in:Corrosion science 2019-05, Vol.152, p.109-119
Main Authors: Luo, Guoyun, Xiao, Hui, Li, Simeng, Wang, Cunshan, Zhu, Qiang, Song, Lijun
Format: Article
Language:English
Subjects:
A. Aluminium
Aluminum base alloys
B. EPMA
B. Polarization
C. Pitting corrosion
C. Segregation
Constituents
Continuous wave lasers
Cooling rate
Corrosion rate
Corrosion resistance
Corrosion resistant alloys
Directional solidification
Morphology
Precipitates
Wave resistance
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Summary:[Display omitted] •Fine and isolated Cu-rich precipitate is obtained by quasi-continuous wave laser surface melting.•The sub-micron sized discrete precipitates are beneficial to pitting corrosion resistance.•Coarse interconnected precipitates are preferred sites for pitting initiation and propagation. A quasi-continuous-wave laser surface melting is performed on 2219 aluminium alloys to improve the corrosion resistance. The fast cooling rate and the multi-directional solidification behavior of the process transform large and long-chained constituent particles into fine and isolated circular precipitates with alleviated solute segregation. The improved corrosion resistance is due to the formation of low-flaw-density passive film, the reduction of the driving force for corrosion and the improvement of the re-passivation capability of the modified surface. The large and long-chained constituent particles are the preferred sites for corrosion initiation and propagation.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.01.035