Octadecanethiol as Corrosion Inhibitor for Zinc and Patterned Zinc-Copper in Humidified Air with Formic Acid
2014 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 161, no 6, C330-C338 p.Article in journal (Refereed) Published
The corrosion inhibition efficiency of octadecanethiol (ODT) for zinc and a zinc-copper patterned model sample (Zn-Cu) has been explored during exposure in an atmosphere that mimics indoor atmospheric corrosion containing humidified air (80% relative humidity at 20 degrees C) and formic acid (around 100 ppb). The corrosion kinetics were monitored in situ with infrared reflection absorption spectroscopy, and the local nature of corrosion effects post-analyzed with complementary scanning electron microscopy, atomic force microscopy and confocal Raman spectroscopy. ODT shows initially a corrosion inhibiting ability both on zinc and on Zn-Cu. This ability decreases with time due to local removal of ODT, which causes micro-galvanic effects that eventually result in corrosion rates that exceed those for the uncovered samples. On bare and ODT-covered samples, the presence of a copper-zinc junction results in both accelerated corrosion and in structurally more developed corrosion products. Overall, the results suggest that ODT can function as a temporary corrosion inhibitor in representative indoor environments on zinc and zinc with zinc-copper junctions.
Place, publisher, year, edition, pages
2014. Vol. 161, no 6, C330-C338 p.
Initial Atmospheric Corrosion, Sum-Frequency Spectroscopy, Reflection-Absorption-Spectroscopy, Alkanethiol-Covered Copper, Self-Assembled Monolayers, Carboxylic-Acids, Acetic-Acid, Generation Spectroscopy, Adsorption, Oxidation
Other Chemistry Topics Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-149519DOI: 10.1149/2.089406jesISI: 000339508600070ScopusID: 2-s2.0-84904795162OAI: oai:DiVA.org:kth-149519DiVA: diva2:739851
FunderSwedish Research Council, 621-2009-3240
QC 201408222014-08-222014-08-222014-09-15Bibliographically approved