Microstructural basis for improved corrosion resistance of laser surface processed AZ31 Mg alloy

Jana, Saumyadeep; Olszta, Matthew J.; Edwards, Danny J.; Engelhard, Mark H.; Samanta, Avik; Ding, Hongtao; Murkute, Pratik; Isgor, Burkan; Rohatgi, Aashish

doi:10.1016/j.corsci.2021.109707

Microstructural basis for improved corrosion resistance of laser surface processed AZ31 Mg alloy

Journal Article · 01 October 2021 · Corrosion Science

DOI:https://doi.org/10.1016/j.corsci.2021.109707· OSTI ID:1820960

Jana, Saumyadeep ^[1]; ^[1]; Edwards, Danny J. ^[1]; ^[1]; Samanta, Avik ^[2]; Ding, Hongtao ^[2]; Murkute, Pratik ^[3]; Isgor, Burkan ^[4]; ^[1]

BATTELLE (PACIFIC NW LAB)
University of Iowa
Vector Corrosion Services, Inc.
Oregon State University

Despite their excellent strength to weight ratio, wider use of Mg alloys for light weighting applications is limited by their poor corrosion resistance, especially in chloride ion-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. Corrosion testing based on ASTM B117 method and several other electrochemical tests indicates substantial enhancement of corrosion resistance in LSP-treated AZ31. The underlying reason behind improved corrosion resistance of LSP-AZ31 surface has been identified using a variety of characterization tools (SEM, TEM, 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 appear to be playing a major role towards improved corrosion resistance after LSP treatment of AZ31 alloy.

Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1820960

Report Number(s):: PNNL-SA-156519

Journal Information:: Corrosion Science, Vol. 191

Country of Publication:: United States

Language:: English

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