Self-Assembled Monolayers as Inhibitors for the Atmospheric Corrosion of Copper Induced by Formic Acid: A Comparison between Hexanethiol and Hexaneselenol

Self-Assembled Monolayers as Inhibitors for the Atmospheric Corrosion of Copper Induced by Formic Acid : A Comparison between Hexanethiol and Hexaneselenol

QC 20131206
The corrosion protection by self-assembled monolayers (SAMs) of hexanethiol and hexaneselenol has been explored on copper exposed to humid air containing formic acid, a corrosive environment relevant for indoor atmospheric corrosion. The kinetics of the formation of corrosion products on SAM covered copper was followed using in-situ infrared reflection/absorption spectroscopy (IRAS) and compared with that of bare copper. Both SAMs initially showed a corrosion protection ability. The prolonged exposure of hexanethiol copper resulted in a reduced formation rate of copper formate and copper hydroxide compared to bare copper, while on bare and hexaneselenol covered samples copper (I) oxide, copper formate, and copper hydroxide were observed. To assess the quality of the SAMs during the sample exposure, vibrational sum frequency spectroscopy (VSFS) was used. It was found that hexaneselenol molecules are locally removed from the surface during corrosion in contrast to their thiol counterparts. This created localized galvanic effects which resulted in an accelerated corrosion of selenol covered copper. X-ray photoelectron spectroscopy at elevated pressure demonstrated that the hexanethiol removed thin oxide layers upon adsorption. A contributing parameter to the enhanced corrosion inhibiting ability of hexanethiol could be its greater ability than hexaneselenol to bind to the copper surface during its deposition and sample exposure.

Götelid, MatsKTH,Materialfysik, MF(Swepub:kth)u1uq5dqb (författare)
Leygraf, ChristoferKTH,Yt- och korrosionsvetenskap(Swepub:kth)u1itk7c9 (författare)
Johnson, C. MagnusKTH,Yt- och korrosionsvetenskap(Swepub:kth)u1swbnpr (författare)
KTHYt- och korrosionsvetenskap (creator_code:org_t)

Ingår i:Journal of the Electrochemical Society: Electrochemical Society161:1, s. C50-C560013-46511945-7111

Av författaren/redakt...: Hosseinpour, Sam ...; Götelid, Mats; Leygraf, Christo ...; Johnson, C. Magn ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Kemiteknik; och Korrosionsteknik

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