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

Abstract

The wetting and corrosion behavior of three bis(trifluoromethylsulfonyl)imide-based ionic liquids: 1-Dodecyl-3-methylimidazolium bis (trifluoromethylsulfonyl) ]/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 [N 1888 ][NTf 2 ]/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 ºC.

Corrosion activity and solubility in polar oils of three bis(trifluoromethylsulfonyl) imide/bis(trifluoromethylsulfonyl) amide ([NTF 2 ]) anion-based ionic liquids

“…In organic media such as the base oils, one of the most important driving forces for solubility is the interaction between hydrophobic residues (carbon chains), and thus it is expectable that the smaller the carbon chains in the cation, the lower the amount of this kind of interaction and therefore the lower the solubility. These results are in agreement with a previous work of our research group [55].…”

Protic Ionic Liquids Used as Metal-Forming Green Lubricants for Aluminum: Effect of Anion Chain Length

“…However, it is important to consider other contact and wettability parameters to elucidate the interaction between the metal substrates and the lubricant fluids. For example, Blanco et al 46 associated lower surface tension values to higher wettability for non-polar molecules, for the same substrate (same surface energy); also, the polarity of the molecules could increase wettability and for some molecules on a substrate, the contact angle can variate with time. In other work, Kalin and Polajnar 47 conducted a study regarding the wettability parameters for different diamond-like carbon (DLC) surfaces and some liquids; according with the DLC energy surface, for the same liquid, there were important differences on contact angle and contact angle variation with time (spreading), and those different behaviors will be reflected in the tribological response.…”

Antibacterial Functionalization of PVD Coatings on Ceramics

“…The changes in the surface roughness, and the presence of metal droplets, are responsible for the changes in the surface energy and the wettability. Accordingly, the lower surface energy for copper leads to higher contact angle values [26].…”