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HomeMaterials Science ForumMaterials Science Forum Vol. 690An Innovative Specimen for Mg Corrosion Studies

An Innovative Specimen for Mg Corrosion Studies

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Abstract:

Plug-in specimens enable measurement of reliable Mg polarization curves. Cathodic polarization curves were measured for high purity Mg in 3.5% NaCl saturated with Mg(OH)₂ using (i) mounted specimens and (ii) plug-in specimens. Polarization curves yielded the corrosion current density i_corr and the corresponding corrosion rate P_i, which was compared with corrosion rates evaluated from hydrogen evolution, P_H, and weight loss, P_W. Mounted specimens produce P_i values three times larger than plug-in specimens, due to crevice corrosion in the mounted specimens. Plug-in specimens had no crevice and allow simultaneous measurement of P_H and P_i. P_i was less than P_H and indicated an apparent valence of 1.45 in support of the existence of the uni-positive Mg⁺ ion.

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Light Metals Technology V

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Periodical:

Materials Science Forum (Volume 690)

Pages:

365-368

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.690.365

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Online since:

June 2011

Authors:

Zhi Ming Shi, Andrej Atrens

Keywords:

Crevice Corrosion, Magnesium, Polarisation, Scanning Electron Microscope (SEM), Weight Loss

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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