Understanding the Interaction of Organic Corrosion Inhibitors with Copper at the Molecular Scale: Benzotriazole on Cu(110)

Journal article


Turano, M., Walker, M., Grillo, F., Gattinoni, C., Edmondson, J., Adesida, O., Hunt, G., Kirkman, P., Richardson, N.V., Baddeley, C.J., Michaelides, A. and Costantini, G. (2021). Understanding the Interaction of Organic Corrosion Inhibitors with Copper at the Molecular Scale: Benzotriazole on Cu(110). Applied Surface Science. https://doi.org/10.1016/j.apsusc.2021.151206
AuthorsTurano, M., Walker, M., Grillo, F., Gattinoni, C., Edmondson, J., Adesida, O., Hunt, G., Kirkman, P., Richardson, N.V., Baddeley, C.J., Michaelides, A. and Costantini, G.
Abstract

Benzotriazole (BTAH) has been used for several industrial applications, but most commonly as a corrosion inhibitor for copper, since the 1950s. However, the mechanism of its interaction with copper surfaces at the atomistic scale is still a matter of debate. Here, the adsorption of BTAH onto a clean Cu(110) surface has been investigated by a combination of scanning tunnelling microscopy, X-ray photoelectron spectroscopy, high resolution electron energy loss spectroscopy and density functional theory calculations. Different supramolecular structures have been observed depending on molecular coverage and annealing. In the low coverage regime, flat lying deprotonated species are formed which give way to benzotriazolate molecules in an upright configuration by increasing the BTAH exposure. The ensuing monolayer is self-limiting but, upon annealing above 150 °C, transforms into a highly ordered nano-ridge structure resulting from a significant in-plane and out-of-plane reconstruction of the surface. All structures are characterised by a strong molecule-substrate interaction and the high coverage phases are dominated by the formation of metal-organic complexes between copper adatoms and benzotriazolate species. These findings shed light on the nature and strength of the interaction occurring between BTAH and copper which lies at the basis of the effectiveness of this prototypical corrosion inhibitor.

KeywordsCorrosion inhibitors STM XPS HREELS DFT
Year2021
JournalApplied Surface Science
PublisherElsevier
Digital Object Identifier (DOI)https://doi.org/10.1016/j.apsusc.2021.151206
Web address (URL)https://www.sciencedirect.com/science/article/pii/S0169433221022613
Publication dates
Print08 Sep 2021
Publication process dates
Accepted04 Sep 2021
Deposited15 Sep 2021
Accepted author manuscript
License
File Access Level
Open
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