title: Polyoxometalate ionic liquids as self-repairing acid-resistant corrosion protection.
abstract: Corrosion is a global problem for any metallic structure or material. Herein we show how metals can easily be protected against acid corrosion using hydrophobic polyoxometalate-based ionic liquids (POM-ILs). Copper metal disks were coated with room-temperature POM-ILs composed of transition-metal functionalized Keggin anions [SiW11 O39 TM(H2 O)](n-) (TM=Cu(II) , Fe(III) ) and quaternary alkylammonium cations (Cn H2 n+1 )4 N(+) (n=7-8). The corrosion resistance against acetic acid vapors and simulated "acid rain" was significantly improved compared with commercial ionic liquids or solid polyoxometalate coatings. Mechanical damage to the POM-IL coating is self-repaired in less than one minute with full retention of the acid protection properties. The coating can easily be removed and recovered by rinsing with organic solvents.
authors.affiliation: Institut für Anorganische Chemie I, Universität Ulm, Albert-Einstein-Allee 11, 89081 Ulm (Germany) http://www.strebgroup.net; Previous address: Anorganische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 1, 91058 Erlangen (Germany).
authors.forename: Sven
authors.initials: S
authors.lastname: Herrmann
authors.forename: Monika
authors.initials: M
authors.lastname: Kostrzewa
authors.forename: Andreas
authors.initials: A
authors.lastname: Wierschem
authors.forename: Carsten
authors.initials: C
authors.lastname: Streb
keywords: corrosion; ionic liquid; metal oxides; polyoxometalate; self-assembly