Journal article
Microstructural basis for improved corrosion resistance of laser surface processed AZ31 Mg alloy
Corrosion science, Vol.191(C), p.109707
10/2021
DOI: 10.1016/j.corsci.2021.109707
Abstract
•Mg alloy (AZ31) shows better corrosion resistance after laser surface processing.•Laser surface processing changes mode of corrosion from localized to uniform.•Laser surface processing creates ∼0.5 μm thick mixed-metal oxide surface film.•Mixed-metal oxide surface film converts to layered double hydroxide film later.
Despite their excellent strength-to-weight ratio, wider use of magnesium (Mg) alloys for light-weight applications is limited by their poor corrosion resistance, especially in chloride-containing environments. The present study shows improved corrosion resistance imparted by laser surface processing (LSP) of a commercial AZ31 (Mg-3Al-1Zn) alloy. Nanosecond laser processing at three different power settings was carried out on the surface of a 1-mm-thick rolled AZ31 sheet. Electrochemical studies and salt spray testing (ASTM B117) indicate substantial enhancement of corrosion resistance in LSP-treated AZ31. The underlying reasons behind improved corrosion resistance of the LSP-AZ31 surface have been studied through detailed microstructural characterization and chemical analysis by SEM, TEM, and XPS. Formation of a ∼0.5 μm thick mixed metal (Mg, Al) oxide surface film, together with refinement in the size and number density of Al-Mn intermetallic particles, are shown to play a major role toward improved corrosion resistance after LSP treatment of the AZ31 alloy.
Details
- Title: Subtitle
- Microstructural basis for improved corrosion resistance of laser surface processed AZ31 Mg alloy
- Creators
- Saumyadeep Jana - Pacific Northwest National LaboratoryMatt Olszta - Pacific Northwest National LaboratoryDanny Edwards - Pacific Northwest National LaboratoryMark Engelhard - Pacific Northwest National LaboratoryAvik Samanta - University of IowaHongtao Ding - University of IowaPratik Murkute - Oregon State UniversityO. Burkan Isgor - Oregon State UniversityAashish Rohatgi - Pacific Northwest National Laboratory
- Resource Type
- Journal article
- Publication Details
- Corrosion science, Vol.191(C), p.109707
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/j.corsci.2021.109707
- ISSN
- 0010-938X
- eISSN
- 1879-0496
- Grant note
- DOI: 10.13039/100009612, name: Oregon State University; DOI: 10.13039/100000993, name: Battelle; DOI: 10.13039/100011661, name: Pacific Northwest National Laboratory; DOI: 10.13039/100006134, name: Office of Energy Efficiency and Renewable Energy; DOI: 10.13039/100000015, name: U.S. Department of Energy, award: DE-AC05-76RL01830; DOI: 10.13039/100006206, name: Biological and Environmental Research
- Language
- English
- Date published
- 10/2021
- Academic Unit
- Mechanical Engineering; Iowa Technology Institute
- Record Identifier
- 9984196535902771
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