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The origin and evolution of copper patina colour
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-9453-1333
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-2510-7766
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-2123-2201
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0003-2206-0082
2019 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 157, p. 337-346Article in journal (Refereed) Published
Abstract [en]

The copper patina colour has been systematically explored through a large set of short- and long-term exposed copper metal samples. The initial brown-black appearance is attributed to semiconducting properties of cuprite (Cu2O) and fully attained at thickness 0.8 +/- 0.2 mu m. The characteristic green-blue appearance is due to the colour forming Cu(II)-ion in the outer patina layer which needs to be 12 +/- 2 mu m to fully cover the inner cuprite layer. No significant influence of atmospheric environment on patina colour is discerned. The green-blue patina colour on historic copper was attained after shorter exposures than in modem copper due to more inhomogeneous microstructure.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 157, p. 337-346
Keywords [en]
Copper, SEM, XPS, Atmospheric corrosion
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-257434DOI: 10.1016/j.corsci.2019.05.025ISI: 000480374200032Scopus ID: 2-s2.0-85067466175OAI: oai:DiVA.org:kth-257434DiVA, id: diva2:1347810
Note

QC 20190902

Available from: 2019-09-02 Created: 2019-09-02 Last updated: 2019-09-02Bibliographically approved

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Leygraf, ChristopherChang, TingruHerting, GunillaOdnevall Wallinder, Inger

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