Atmospheric corrosion of Cu, Zn, and Cu-Zn alloys protected by self-assembled monolayers of alkanethiols
2016 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 648, 170-176 p.Article in journal (Refereed) PublishedText
In this article results from earlier studies have been compiled in order to compare the protection efficiency of self-assembled monolayers (SAM) of alkanethiols for copper, zinc, and copper-zinc alloys exposed to accelerated indoor atmospheric corrosion conditions. The results are based on a combination of surface spectroscopy and microscopy techniques. The protection efficiency of investigated SAMs increases with chain length which is attributed to transport hindrance of the corrosion stimulators in the atmospheric environment, water, oxygen and formic acid, towards the copper surface. The transport hindrance is selective and results in different corrosion products on bare and on protected copper. Initially the molecular structure of SAMs on copper is well ordered, but the ordering is reduced with exposure time. Octadecanethiol (ODT), the longest alkanethiol investigated, protects copper significantly better than zinc, which may be attributed to the higher bond strength of Cu-S than of Zn-S. Despite these differences, the corrosion protection efficiency of ODT for the single phase Cu20Zn brass alloy is equally efficient as for copper, but significantly less for the heterogeneous double phase Cu40Zn brass alloy.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 648, 170-176 p.
Self-assembled monolayers, Copper, Brass, Atmospheric corrosion, Vibrational sum frequency spectroscopy, Infrared reflection/absorption spectroscopy
Condensed Matter Physics Chemical Sciences
IdentifiersURN: urn:nbn:se:kth:diva-186550DOI: 10.1016/j.susc.2015.10.045ISI: 000374198600025ScopusID: 2-s2.0-84958770816OAI: oai:DiVA.org:kth-186550DiVA: diva2:927969
QC 201605132016-05-132016-05-132016-05-16Bibliographically approved