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Electrochemical noise analysis of the corrosion of high-purity Mg-Al alloys

: Casajús, P.; Winzer, N.

Volltext urn:nbn:de:0011-n-3435141 (2.8 MByte PDF)
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Erstellt am: 16.02.2017

Corrosion science 94 (2015), S.316-326
ISSN: 0010-938X
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWM ()
magnesium; alloy; pitting corrosion; passive films

Corrosion of high-purity Mg-Al alloys containing 3, 6 and 9 wt.% Al was investigated using electrochemical noise (EN) analysis. Changes in the EN signals were correlated with macroscopically observable events on the sample surfaces, which were recorded using time-lapse photography. Steady-state corrosion in all alloys was highly localised. For the Mg3%Al alloy, localised corrosion was preceeded by a period of general corrosion. The corrosion rate of the as-cast Mg9%Al alloy was less than those of the other materials but increased with solution annealing time. The results are consistent with strong galvanic coupling between Al-depleted and -enriched zones of the a-phase.