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

 
: Casajús, P.; Winzer, N.

:
Fulltext urn:nbn:de:0011-n-3435141 (2.8 MByte PDF)
MD5 Fingerprint: 526dfd07f5a28b5793c8fd49528def69
Created on: 16.02.2017


Corrosion science 94 (2015), pp.316-326
ISSN: 0010-938X
English
Journal Article, Electronic Publication
Fraunhofer IWM ()
magnesium; alloy; pitting corrosion; passive films

Abstract
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.

: http://publica.fraunhofer.de/documents/N-343514.html