Wettability and corrosion of [NTf2] anion-based ionic liquids on steel and PVD (TiN, CrN, ZrN) coatings.

Blanco, D, Viesca Rodriguez, J.L., Mallada, M., Ramajo, B, Gonzalez, R. and Hernandez Battez, A., 2016. Wettability and corrosion of [NTf2] anion-based ionic liquids on steel and PVD (TiN, CrN, ZrN) coatings. Surface & Coatings Technology, 302 (September), 13 - 21.

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DOI: 10.1016/j.surfcoat.2016.05.051

Abstract

Thewetting and corrosion behavior of three bis(trifluoromethylsulfonyl)imide-based ionic liquids: 1-Dodecyl-3- methylimidazolium bis(trifluoromethylsulfonyl)imide [C12MIM][NTf2], tributylmethylammonium bis(trifluoromethylsulfonyl)imide [N4441][NTf2] and methyltrioctylammonium bis(trifluoromethylsulfonyl)imide [N1888][NTf2] are tested in this research. The surface tension was measured for temperatures of 293–353 K resulting in the expected linearly decreasing behavior with temperature increase. In addition, contact angle measurements were made on AISI 52100 steel and three coatings (TiN, CrN and ZrN) obtained by PVD technique, finding the regular behavior in hydrophobic (non-polar) systems: high contact angles led to high surface tensions. Complementary parameters like spreading parameter and polarity fraction were calculated to enhance the wetting evaluation of these ionic liquids. [N1888][NTf2]/TiN resulted as the best IL-surface combination for a good wettability, due to the higher dispersion of the charge on the large size cation in this IL and the higher values of total and polar component of the surface free energy for this coating. Finally, SEM-EDS analysis determined that [N1888][NTf2]/ZrN was the best option in order to avoid corrosion problems. The evaporation of water, present as impurity in the ionic liquids, was found the main reason because of corrosion did not occur in the tests carried out at 100 °C.

Item Type:Article
ISSN:0257-8972
Uncontrolled Keywords:NTf2-based ionic liquids ; Surface tension ; Contact angle ; Spreading parameter ; PVD coatings ; Corrosion
Group:Faculty of Science & Technology
ID Code:26190
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:22 Feb 2017 16:33
Last Modified:21 May 2017 01:08

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