Corrosion behaviour of laser surface melted magnesium alloy AZ91D

Taltavull, C., Torres, B., Lopez, A. J., Rodrigo, P., Otero, E., Atrens, A. and Rams, J. (2014) Corrosion behaviour of laser surface melted magnesium alloy AZ91D. Materials and Design, 57 40-50. doi:10.1016/j.matdes.2013.12.069

Author Taltavull, C.
Torres, B.
Lopez, A. J.
Rodrigo, P.
Otero, E.
Atrens, A.
Rams, J.
Title Corrosion behaviour of laser surface melted magnesium alloy AZ91D
Journal name Materials and Design   Check publisher's open access policy
ISSN 0261-3069
Publication date 2014-05
Sub-type Article (original research)
DOI 10.1016/j.matdes.2013.12.069
Open Access Status
Volume 57
Start page 40
End page 50
Total pages 11
Place of publication Camden, London, United Kingdom
Publisher Elsevier
Collection year 2015
Language eng
Formatted abstract
• Corrosion behavior of AZ91D Mg alloys is intimately related with its microstructure.
• Laser surface melting treatments allows surface modification of the microstructure.
• Different laser parameters can achieve different microstructures.
• Controlling laser parameters can produce different corrosion rates and morphologies.
• Increase of surface roughness due to laser treatment is relevant to the corrosion rate.

A high power diode laser (HPDL) was used to produce laser surface melting (LSM) treatments on the surface of the Mg alloy AZ91D. Different treatments with different microstructures were produced by varying the laser-beam power and laser-scanning speed. Corrosion evaluation, using hydrogen evolution and electrochemical measurements, led to a relationship between microstructure and corrosion. Most corrosion rates for LSM treated specimens were within the scatter of the as-received AZ91D, whereas some treatments gave higher corrosion rates and some of the samples had corrosion rates lower than the average of the corrosion rate for AZ91D. There were differences in corroded surface morphology. Nevertheless laser treatments introduced surface discontinuities, which masked the effect of the microstructure. Removing these surface defects decreased the corrosion rate for the laser-treated samples.
Keyword Magnesium
Laser processing
Scanning electron microscopy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
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Citation counts: TR Web of Science Citation Count  Cited 23 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 22 times in Scopus Article | Citations
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Created: Thu, 16 Jan 2014, 14:48:33 EST by Deanna Mahony on behalf of Materials