Tracer Film Growth Study of the Corrosion of Magnesium Alloys AZ31B and ZE10A in 0.01% NaCl Solution
Abstract
We conducted a sequential isotopic tracer study of corrosion film growth for Mg-3Al-1Zn-0.25Mn (AZ31B) and Mg-1.2Zn-0.25Zr-<0.5Nd (ZE10A) by 4 h immersion in H218O or D216O, followed by a 20 h immersion in a 0.01 wt% NaCl H218O or D216O solution. Sputter depth profiles were obtained for 16O, 18O, H, and D using secondary ion mass spectrometry (SIMS). When compared to the previous tracer study for these alloys in salt-free water, the addition of 0.01 wt% NaCl resulted in a transition from oxygen inward-dominated film growth to a component of mixed inward/outward film growth for both alloys. The hydrogen tracer behavior remained inward growing for AZ31B, and short-circuit, inward growing for ZE10A, in both pure water and in 0.01 wt% NaCl solution, with extensive penetration of D beyond the film and into the underlying alloy also observed for ZE10A. Our analysis of the films by X-ray photoelectron spectroscopy (XPS) and cross-section scanning transmission electron microscopy (STEM) indicated intermixed Mg(OH)2 and MgO, with the relative fraction of Mg(OH)2 peaking near the center of the film. These findings suggest a decoupled film growth mechanism, with initial formation of oxide followed by NaCl-accelerated conversion to hydroxide, likely by both solid-state and dissolution-precipitation processes.
- Authors:
-
[1];
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Manitoba, Winnipeg, MB (Canada)
- Magnesium Elektron North America, Madison, IL (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1360066
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Electrochemical Society
- Additional Journal Information:
- Journal Volume: 164; Journal Issue: 7; Journal ID: ISSN 0013-4651
- Publisher:
- The Electrochemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Brady, M. P., Fayek, M., Leonard, D. N., Meyer, H. M., Thomson, J. K., Anovitz, L. M., Rother, G., Song, G. -L., and Davis, B. Tracer Film Growth Study of the Corrosion of Magnesium Alloys AZ31B and ZE10A in 0.01% NaCl Solution. United States: N. p., 2017.
Web. doi:10.1149/2.1211707jes.
Brady, M. P., Fayek, M., Leonard, D. N., Meyer, H. M., Thomson, J. K., Anovitz, L. M., Rother, G., Song, G. -L., & Davis, B. Tracer Film Growth Study of the Corrosion of Magnesium Alloys AZ31B and ZE10A in 0.01% NaCl Solution. United States. https://doi.org/10.1149/2.1211707jes
Brady, M. P., Fayek, M., Leonard, D. N., Meyer, H. M., Thomson, J. K., Anovitz, L. M., Rother, G., Song, G. -L., and Davis, B. Thu .
"Tracer Film Growth Study of the Corrosion of Magnesium Alloys AZ31B and ZE10A in 0.01% NaCl Solution". United States. https://doi.org/10.1149/2.1211707jes. https://www.osti.gov/servlets/purl/1360066.
@article{osti_1360066,
title = {Tracer Film Growth Study of the Corrosion of Magnesium Alloys AZ31B and ZE10A in 0.01% NaCl Solution},
author = {Brady, M. P. and Fayek, M. and Leonard, D. N. and Meyer, H. M. and Thomson, J. K. and Anovitz, L. M. and Rother, G. and Song, G. -L. and Davis, B.},
abstractNote = {We conducted a sequential isotopic tracer study of corrosion film growth for Mg-3Al-1Zn-0.25Mn (AZ31B) and Mg-1.2Zn-0.25Zr-<0.5Nd (ZE10A) by 4 h immersion in H218O or D216O, followed by a 20 h immersion in a 0.01 wt% NaCl H218O or D216O solution. Sputter depth profiles were obtained for 16O, 18O, H, and D using secondary ion mass spectrometry (SIMS). When compared to the previous tracer study for these alloys in salt-free water, the addition of 0.01 wt% NaCl resulted in a transition from oxygen inward-dominated film growth to a component of mixed inward/outward film growth for both alloys. The hydrogen tracer behavior remained inward growing for AZ31B, and short-circuit, inward growing for ZE10A, in both pure water and in 0.01 wt% NaCl solution, with extensive penetration of D beyond the film and into the underlying alloy also observed for ZE10A. Our analysis of the films by X-ray photoelectron spectroscopy (XPS) and cross-section scanning transmission electron microscopy (STEM) indicated intermixed Mg(OH)2 and MgO, with the relative fraction of Mg(OH)2 peaking near the center of the film. These findings suggest a decoupled film growth mechanism, with initial formation of oxide followed by NaCl-accelerated conversion to hydroxide, likely by both solid-state and dissolution-precipitation processes.},
doi = {10.1149/2.1211707jes},
journal = {Journal of the Electrochemical Society},
number = 7,
volume = 164,
place = {United States},
year = {Thu May 25 00:00:00 EDT 2017},
month = {Thu May 25 00:00:00 EDT 2017}
}
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