The Influence of Chloride Ion Concentration on Passivity Breakdown in Magnesium | Zendy

G. Williams | Zendy; Hefin ap Llwyd Dafydd | Zendy; Raman Subramanian | Zendy; H. N. McMurray | Zendy

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The Influence of Chloride Ion Concentration on Passivity Breakdown in Magnesium

Author(s) -

G. Williams,

Hefin ap Llwyd Dafydd,

Raman Subramanian,

H. N. McMurray

Publication year - 2017

Publication title -

corrosion

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.744

H-Index - 89

eISSN - 1938-159X

pISSN - 0010-9312

DOI - 10.5006/2328

Subject(s) - magnesium , passivity , chloride , ion , corrosion , inorganic chemistry , chemistry , materials science , metallurgy , organic chemistry , electrical engineering , engineering

An empirically derived dependence of an apparent breakdown potential (Eb) of magnesium (Mg) on chloride ion concentration is reported. In situations where spontaneous breakdown in the absence of external polarization is observed, leading to the subsequent propagation of localized corrosion, Eb can be determined by following time-dependent changes in free corrosion potential (Ecorr). Breakdown of temporary passivity is marked by a clear inflection in the time-dependent value of Ecorr, characterized by a sharp decrease in potential from a maximum value where Ecorr = Eb. Characterization of localized corrosion behavior by in situ scanning vibrating electrode studies, prior to and following the point of breakdown, is used to explain the observed Ecorr vs. time characteristics. Examples of typical behavior upon immersion in aqueous solutions containing different chloride ion concentrations ([Cl−]) are given for commercially pure Mg and an AZ31 alloy. For high purity Mg, which remains passive at pH 11 at all ch...

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