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Corrosion behaviour of Mg/Al alloys in high humidity atmospheres
Author(s) -
Arrabal R.,
Pardo A.,
Merino M. C.,
Merino S.,
Mohedano M.,
Casajús P.
Publication year - 2011
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200905538
Subject(s) - corrosion , metallurgy , materials science , microstructure , alloy , gravimetric analysis , relative humidity , aluminium , humidity , magnesium , magnesium alloy , phase (matter) , chemistry , thermodynamics , physics , organic chemistry
The influence of relative humidity (80–90–98% RH) and temperature (25 and 50 °C) on the corrosion behaviour of AZ31, AZ80 and AZ91D magnesium alloys was evaluated using gravimetric measurements. The results were compared with the data obtained for the same alloys immersed in Madrid tap water. The corrosion rates of AZ alloys increased with the RH and temperature and were influenced by the aluminium content and alloy microstructure for RH values above 90%. The initiation of corrosion was localised around the Al–Mn inclusions in the AZ31 alloy and at the centre of the α‐Mg phase in the AZ80 and AZ91D alloys. The β‐Mg 17 Al 12 phase acted as a barrier against corrosion.