skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The anodic surface film and hydrogen evolution on Mg

Journal Article · · Corrosion Science
 [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

This paper clarifies that the inner and outer layers of the anodic film consist of a nano/micro-porous MgO+Mg(OH)2 mixture. The film becomes thicker and more porous with increasing potential. It can rupture when potential is too positive in a non-corrosive Mg(OH)2 solution. Hydrogen evolution becomes more intensive as polarization potential increases, particularly when the potential at the film-covered Mg surface is close to or more positive than the hydrogen equilibrium potential, suggesting that an “anodic hydrogen evolution” (AHE) reaction occurs on the substrate Mg in film pores, and the significantly intensified AHE causes film rupture at high potential.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1201283
Alternate ID(s):
OSTI ID: 1252106
Journal Information:
Corrosion Science, Vol. 98; ISSN 0010-938X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 127 works
Citation information provided by
Web of Science

References (42)

In vivo corrosion of four magnesium alloys and the associated bone response journal June 2005
The potential-pH diagram of the magnesium-water system journal March 1974
Corrosion of magnesium journal January 1993
Crystal orientation and electrochemical corrosion of polycrystalline Mg journal October 2012
The initial interaction of water vapour with MgAl alloy surfaces at room temperature journal July 1994
Effect of the chemistry and structure of the native oxide surface film on the corrosion properties of commercial AZ31 and AZ61 alloys journal August 2011
Atmospheric corrosion of two field-exposed AZ31B magnesium alloys with different grain size journal June 2013
The effect of surface pretreatment on the corrosion performance of Electroless E-coating coated AZ31 journal September 2012
ToF-SIMS depth profile of the surface film on pure magnesium formed by immersion in pure water and the identification of magnesium hydride journal September 2009
Morphology and Structure of Oxide Films Formed on Magnesium by Exposure to Air and Water journal October 1995
Characterization of Anodic Films on AZ31 Magnesium Alloys in Alkaline Solutions Containing Fluoride and Phosphate Anions journal January 2006
Characterization of the Magnesium Alloy AZ31 Surface in the Ionic Liquid Trihexyl(tetradecyl)phosphonium Bis(trifluoromethanesulfonyl)amide journal January 2010
Nature of Surface Film Formed on Mg Exposed to 1 M NaOH journal November 2012
Towards a Physical Description for the Origin of Enhanced Catalytic Activity of Corroding Magnesium Surfaces journal January 2014
Nature of Surface Film on Matrix Phase of Mg Alloy AZ80 Formed in Water journal August 2013
Analysis of the surface film formed on Mg by exposure to water using a FIB cross-section and STEM–EDS journal June 2012
Corrosion product formation during NaCl induced atmospheric corrosion of magnesium alloy AZ91D journal March 2007
Tracer Film Growth Study of Hydrogen and Oxygen from the Corrosion of Magnesium in Water journal January 2014
Transmission Electron Microscopy Study of Aqueous Film Formation and Evolution on Magnesium Alloys journal January 2014
Magnesium and its alloys as orthopedic biomaterials: A review journal March 2006
Growth mechanism of hydroxyapatite-coatings formed on pure magnesium and corrosion behavior of the coated magnesium journal July 2011
In vitro and in vivo evaluation of the surface bioactivity of a calcium phosphate coated magnesium alloy journal March 2009
Effect of bicarbonate on biodegradation behaviour of pure magnesium in a simulated body fluid journal January 2014
Corrosion behaviour of stressed magnesium alloys journal April 2002
Effect of second phases on the corrosion behaviour of wrought Mg–Zn–Y–Zr alloy journal May 2010
Effect of tin modification on corrosion of AM70 magnesium alloy journal September 2009
Improvement in corrosion characteristics of AZ31 Mg alloy by square pulse anodizing between transpassive and active regions journal October 2012
Anodic oxidation of Mg–Sn alloys in alkaline solutions journal December 2012
Recent Progress in Corrosion and Protection of Magnesium Alloys journal July 2005
Evolution of hydrogen at dissolving magnesium surfaces journal May 2013
Investigating the Real Time Dissolution of Mg Using Online Analysis by ICP-MS journal December 2013
Potential and current distributions of one-dimensional galvanic corrosion systems journal February 2010
The possibility of forming a sacrificial anode coating for Mg journal October 2014
Corrosion mechanism and evaluation of anodized magnesium alloys journal August 2014
The electrochemical corrosion of pure magnesium in 1 N NaCl journal May 1997
The behaviour of magnesium during free corrosion and potentiodynamic polarization investigated by real-time hydrogen measurement and optical imaging journal February 2014
Film Breakdown and Nano-Porous Mg(OH) 2 Formation from Corrosion of Magnesium Alloys in Salt Solutions journal January 2015
The anodic dissolution of magnesium in chloride and sulphate solutions journal October 1997
Corrosion Mechanisms of Magnesium Alloys journal September 1999
The effect of zirconium grain refinement on the corrosion behaviour of magnesium-rare earth alloy MEZ journal February 2002
Dehydrogenation reactions in Mg + (H 2 O) n clusters journal March 1994
Photodissociation of size-selected aquamagnesium (Mg+(H2O)n) ions for n = 1 and 2 journal October 1992

Cited By (9)

Effect of Initial Orientation on Corrosion Behavior of AZ80 Magnesium Alloy in Simulated Body Fluid journal January 2020
SVET and ToF-SIMS Studies on the Galvanic Corrosion of β -phase/Aluminum Couple in Aqueous Solutions as a Function of pH journal January 2020
Corrosion of Mg alloys EV31A, WE43B, and ZE41A in chloride‐ and sulfate‐containing solutions saturated with magnesium hydroxide journal December 2019
Influence of Alloyed Ga on the Microstructure and Corrosion Properties of As-Cast Mg–5Sn Alloys journal November 2019
The Inhibitive Effect of Artificial Seawater on Magnesium Corrosion journal May 2019
SVET and SIET Study of Galvanic Corrosion of Al/MgZn 2 in Aqueous Solutions at Different pH journal January 2018
Mg(OH)2 Films Prepared by Ink-Jet Printing and Their Photocatalytic Activity in CO2 Reduction and H2O Conversion journal April 2018
Recent Progress on Corrosion Behavior and Mechanism of Mg–RE Based Alloys with Long Period Stacking Ordered Structure journal August 2019
Microstructure and Corrosion Resistance of PEO Coatings Formed on KBM10 Mg Alloy Pretreated with Nd(NO3)3 journal June 2018