Film breakdown and nano-porous Mg(OH)2 formation from corrosion of magnesium alloys in salt solutions

Brady, M. P.; Rother, G.; Littrell, K. C.; Unocic, K. A.; Elsentriecy, H. H.; Song, G. -L.; Thomson, J. K.; Gallego, N. C.; Davis, B.

doi:10.1149/2.0171504jes

Title: Film breakdown and nano-porous Mg(OH)₂ formation from corrosion of magnesium alloys in salt solutions

Journal Article · Wed Jan 21 00:00:00 EST 2015 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0171504jes· OSTI ID:1185706

Brady, M. P. ^[1]; Rother, G. ^[1]; Littrell, K. C. ^[1]; Unocic, K. A. ^[1]; Elsentriecy, H. H. ^[2]; Song, G. -L. ^[1]; Thomson, J. K. ^[1]; Gallego, N. C. ^[1]; Davis, B. ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Central Metallurgical Research and Development Inst. (CMRDI), Cairo (Egypt)
Magnesium Elektron North America (MENA), Madison, IL (United States)

In this paper, small angle neutron scattering (SANS) and scanning transmission electron microscopy (STEM) were used to study film formation by magnesium alloys AZ31B (Mg-3Al-1Zn base) and ZE10A (Elektron 717, E717: Mg-1Zn + Nd, Zr) in H₂O and D₂O with and without 1 or 5 wt% NaCl. No SANS scattering changes were observed after 24 h D₂O or H₂O exposures compared with as-received (unreacted) alloy, consistent with relatively dense MgO-base film formation. However, exposure to 5 wt% NaCl resulted in accelerated corrosion, with resultant SANS scattering changes detected. The SANS data indicated both particle and rough surface (internal and external) scattering, but with no preferential size features. The films formed in 5 wt% NaCl consisted of a thin, inner MgO-base layer, and a nano-porous and filamentous Mg(OH)₂ outer region tens of microns thick. Chlorine was detected extending to the inner MgO-base film region, with segregation of select alloying elements also observed in the inner MgO, but not the outer Mg(OH)₂. Modeling of the SANS data suggested that the outer Mg(OH)₂ films had very high surface areas, consistent with loss of film protectiveness. Finally, implications for the NaCl corrosion mechanism, and the potential utility of SANS for Mg corrosion, are discussed.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1185706

Journal Information:: Journal of the Electrochemical Society, Vol. 162, Issue 4; ISSN 0013-4651

Publisher:: The Electrochemical Society

Country of Publication:: United States

Language:: English

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