The influence of SO2 on the corrosion of Mg and Mg-Al alloys

Esmaily, Mohsen,1987Chalmers tekniska högskola,Chalmers University of Technology (författare)

QC 20150522
The SO2-induced atmospheric corrosion of some magnesium-aluminum (Mg-Al) alloys, including Mg alloy AZ91D, and commercially pure Mg (CP Mg) was investigated using well-controlled laboratory exposures and included real-time measurements of SO2 deposition. The influence of SO2 concentration, alloy composition, humidity, and ppb level additions of O-3 or NO2 on the rate of SO2 deposition was investigated. SO2 accelerates the corrosion of Mg and Mg alloys causing localized corrosion, MgSO(3)6H(2)O being the dominant corrosion product. At 60% RH, traces of O-3 or NO2 strongly increased both the SO2 deposition and the corrosion rate. The rate of SO2 deposition was strongly dependent on humidity; at 70% RH and higher the SO2 deposition rate was very rapid and constant in time while it was transient below 50% RH. At 60% RH, a change from transient to rapid, steady-state, SO2 deposition occurred. The sudden activation is explained by the onset of electrochemical corrosion. The activation behavior was shown to depend on SO2 concentration, the thickness of the surface film and by the presence of ambient O-2. (C) The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.

NATURVETENSKAP Kemi Annan kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Other Chemistry Topics hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik Metallurgi och metalliska material hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Metallurgy and Metallic Materials hsv//eng
Alloys
Aluminum
Aluminum coatings
Atmospheric corrosion
Atmospheric humidity
Chemical activation
Corrosion
Corrosion rate
Deposition
Electrochemical corrosion
Activation behavior
Alloy compositions
Controlled laboratories
Corrosion products
Localized corrosion
Mg-Al alloys
Real time measurements
Surface films

Blücher, D. B.SINTEF Materials and Chemistry (författare)
Wreland Lindström, RakelKTH,Tillämpad elektrokemi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)(Swepub:kth)u1j6oqnj (författare)
Svensson, Jan-Erik,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jes (författare)
Johansson, Lars-Gunnar,1952Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lg (författare)
Chalmers tekniska högskolaSINTEF Materials and Chemistry (creator_code:org_t)

Ingår i:Journal of the Electrochemical Society: The Electrochemical Society162:6, s. C260-C2690013-46511945-7111

Av författaren/redakt...: Esmaily, Mohsen, ...; Blücher, D. B.; Wreland Lindströ ...; Svensson, Jan-Er ...; Johansson, Lars- ...

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Metallurgi och m ...

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