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

Journal Article · · Corrosion Science
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 Laboratory (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, Journal Name: Corrosion Science Vol. 191
Country of Publication:
United States
Language:
English

References (52)

Thermodynamic assessment of the Aluminum-Manganese (Al-Mn) binary phase diagram journal January 1999
Tracer Film Growth Study of the Corrosion of Magnesium Alloys AZ31B and ZE10A in 0.01% NaCl Solution journal January 2017
Corrosion protection of magnesium alloys by cerium, zirconium and niobium-based conversion coatings journal July 2008
Surface modification for mitigation of corrosion/localised corrosion of magnesium alloys journal September 2007
Protective coatings on magnesium and its alloys — a critical review journal April 2002
Conversion-coating treatment for magnesium alloys by a permanganate–phosphate solution journal April 2003
Investigation of critical processing parameters for laser surface processing of AZ31B-H24 journal September 2017
The corrosion behavior of AZ31 alloy in chloride and sulfate media – A comparative study through electrochemical investigations journal March 2019
Surface integrity and process mechanics of laser shock peening of novel biodegradable magnesium–calcium (Mg–Ca) alloy journal October 2010
Recent Progress in Corrosion and Protection of Magnesium Alloys journal July 2005
Improving the Surface Properties of Magnesium by Laser Alloying journal June 1998
Anodizing Treatments for Magnesium Alloys and Their Effect on Corrosion Resistance in Various Environments journal June 2006
Transmission Electron Microscopy Study of Aqueous Film Formation and Evolution on Magnesium Alloys journal January 2014
Microstructure and corrosion characteristics of laser-alloyed magnesium alloy AZ91D with Al–Si powder journal April 2008
Development of Laser Surface Technologies for Anti-Corrosion on Magnesium Alloys: a Review journal June 2016
Fundamentals and advances in magnesium alloy corrosion journal August 2017
Electrochemical performance of microarc oxidation films formed on AZ91D magnesium alloy in silicate and phosphate electrolytes journal March 2006
Understanding Magnesium Corrosion—A Framework for Improved Alloy Performance journal December 2003
Corrosion Mechanisms of Magnesium Alloys journal September 1999
Effects of laser shock processing on stress corrosion cracking susceptibility of AZ31B magnesium alloy journal September 2010
Corrosion of AZ91D magnesium alloy with a chemical conversion coating and electroless nickel layer journal June 2004
Application of layered double hydroxides for removal of oxyanions: A review journal March 2008
Pilling-Bedworth ratio for oxidation of alloys journal March 2000
Excimer Laser Processing of Cast Mg-Al-Zn (AZ91D) and Mg-Al (AM60B) Alloys for Improved Corrosion Resistance journal December 2016
Surface protection of Mg alloys in automotive applications: A review journal January 2019
UHV and Ambient Pressure XPS: Potentials for Mg, MgO, and Mg(OH)2 Surface Analysis journal October 2016
Electrochemical corrosion study of Mg–Al–Zn–Mn alloy in aqueous ethylene glycol containing chloride ions journal January 2017
Effects of NaAlO2 on structure and corrosion resistance of microarc oxidation coatings formed on AM60B magnesium alloy in phosphate–KOH electrolyte journal September 2005
Growth behavior of MgAl-layered double hydroxide films by conversion of anodic films on magnesium alloy AZ31 and their corrosion protection journal October 2018
The localised corrosion of Mg alloy AZ31 in chloride containing electrolyte studied by a scanning vibrating electrode technique journal October 2013
Advances in Mg corrosion and research suggestions journal September 2013
Effect of electrolyte additives on performance of plasma electrolytic oxidation films formed on magnesium alloy AZ91D journal March 2007
Corrosion behaviour of laser-melted magnesium alloys journal July 2005
Effect of HCl pre-treatment on corrosion resistance of cerium-based conversion coatings on magnesium and magnesium alloys journal April 2005
Effect of laser surface melting on corrosion and wear resistance of a commercial magnesium alloy journal November 2003
Electrochemical Properties of Intermetallic Phases and Common Impurity Elements in Magnesium Alloys journal January 2011
Improved corrosion and wear resistance of Mg alloys via laser surface modification of Al on AZ31B journal January 2012
Significant improvement of corrosion resistance of biodegradable metallic implants processed by laser shock peening journal January 2012
Hierarchical micro- and nanostructures induced by nanosecond laser on copper for superhydrophobicity, ultralow water adhesion and frost resistance journal October 2018
Localized Corrosion of Magnesium in Chloride-Containing Electrolyte Studied by a Scanning Vibrating Electrode Technique journal January 2008
Effect of confinement on surface modification for laser peen forming without protective coating journal March 2016
AC impedance spectroscopy study of the corrosion behavior of an AZ91 magnesium alloy in 0.1M sodium sulfate solution journal February 2007
Nanosecond laser-based high-throughput surface nanostructuring (nHSN) journal March 2020
The corrosion of pure magnesium in aerated and deaerated sodium sulphate solutions journal March 2001
Sol–gel coatings with phosphonate functionalities for surface modification of magnesium alloys journal August 2006
A corrosion study of the main constituent phases of AZ91 magnesium alloys journal December 2003
On the stability of the oxides film formed on a magnesium alloy containing rare-earth elements journal November 2018
Characterization of Nano-Scale Protective Oxide Films: Application on Metal Chemical Mechanical Planarization journal November 2014
Sol–gel coatings on metals for corrosion protection journal March 2009
Corrosion resistance of Mg–Al-LDH coating on magnesium alloy AZ31 journal November 2014
Accurate Electrochemical Measurement of Magnesium Corrosion Rates; a Combined Impedance, Mass-Loss and Hydrogen Collection Study journal March 2014
Effect of treatment time in the Mg(OH)2/Mg–Al LDH composite film formed on Mg alloy AZ31 by steam coating on the corrosion resistance journal January 2016

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