The anodically-enhanced cathodic activation of high-purity Mg was studied by global and local electrochemical measurements in unbuffered 0.6 M NaCl, 0.6 M NaCl saturated in Mg(OH)2, 0.1 M MgCl2, 0.1 M Na2SO4, and 0.1 M tris(hydroxymethyl)aminomethane hydrochloride (TRIS). The selection of diverse aqueous environments was deliberate in order to explore the effect of dissolution product upon subsequent cathodic activation. Cathodic activation was found to be strong in all of the chloride-containing environments where a porous hydroxide forms; weak in Na2SO4 where a denser, more compact hydroxide forms; and negligible in TRIS where no hydroxide forms. Elemental enrichment, mapped using microparticle-induced x-ray emission, revealed the enrichment of Fe only in Cl−-containing environments, suggesting that noble metal enrichment provides a stronger influence on cathodic activation than that of Mg(OH)2 films.
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1 February 2021
Research Article|
September 16 2020
Insight into the Effect of Mg(OH)2 Films vs. Noble Element Enrichment on the Global and Local Cathodic Activation of Corroding Mg
T.W. Cain;
T.W. Cain
*Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904.
**Now at the CCDC Army Research Lab, Aberdeen Proving Grounds, Maryland 21005.
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C.F. Glover;
C.F. Glover
‡
*Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904.
‡Corresponding author. E-mail: [email protected].
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J.S. Laird;
J.S. Laird
***University of Melbourne, School of Chemistry, Parkville, Victoria 3010, Australia.
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N. Birbilis;
N. Birbilis
****College of Engineering and Computer Science, Australian National University, ACT, 2601, Canberra Australia.
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J.R. Scully
J.R. Scully
*Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904.
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CORROSION (2021) 77 (2): 115–133.
Citation
T.W. Cain, C.F. Glover, J.S. Laird, N. Birbilis, J.R. Scully; Insight into the Effect of Mg(OH)2 Films vs. Noble Element Enrichment on the Global and Local Cathodic Activation of Corroding Mg. CORROSION 1 February 2021; 77 (2): 115–133. doi: https://doi.org/10.5006/3634
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