Corrosion and inhibition of copper in hydrocarbon solution on a molecular level investigated using neutron reflectometry and XPS

[Display omitted] •Corrosion of CuO by sulphur in oil is inhibited by organic amine but not thiol.•Neutron reflection gives insight into the layer structure and composition.•The most well packed organic layer does not give the best corrosion protection.•Organic thiol selectively removes Cu(II) to le...

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Bibliographic Details
Published in:Corrosion science 2017-02, Vol.115, p.68-77
Main Authors: Welbourn, Rebecca J.L., Truscott, C.L., Skoda, M.W. A., Zarbakhsh, A., Clarke, S.M.
Format: Article
Language:English
Subjects:
A. Copper
A. Organic coatings
Additives
B. XPS
C. Oxidation
C. Oxide coatings
Chemical compounds
Copper oxides
Corrosion
Corrosion inhibitors
Corrosion prevention
Molecular structure
Reflectometry
Spectrum analysis
Sulfur
X ray photoelectron spectroscopy
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Summary:[Display omitted] •Corrosion of CuO by sulphur in oil is inhibited by organic amine but not thiol.•Neutron reflection gives insight into the layer structure and composition.•The most well packed organic layer does not give the best corrosion protection.•Organic thiol selectively removes Cu(II) to leave a Cu(I) surface. The behaviour and molecular structure of three organic additives adsorbed from oil onto a copper surface rich in copper (II) oxide is presented. The variation in the ability of these three agents to prevent corrosion of the copper oxide surface by exposure to sulphur is also included. A combination of visible observations, X-ray photoelectron spectroscopy (XPS) and neutron reflection (NR) are used to characterise both the adsorbed layer and underlying copper oxide. The model additives are chosen to represent ‘effective’, ‘intermediate’ and ‘ineffective’ inhibitors for copper.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2016.11.010