Interaction between an imidazolium based ionic liquid and the AZ91D magnesium alloy (Articolo in rivista)

Type
Label
  • Interaction between an imidazolium based ionic liquid and the AZ91D magnesium alloy (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/adem.200600250 (literal)
Alternative label
  • Caporali S., Ghezzi F., Giorgetti A., Lavacchi A., Tolstogouzov A., Bardi U. (2007)
    Interaction between an imidazolium based ionic liquid and the AZ91D magnesium alloy
    in Advanced engineering materials (Internet)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Caporali S., Ghezzi F., Giorgetti A., Lavacchi A., Tolstogouzov A., Bardi U. (literal)
Pagina inizio
  • 185 (literal)
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  • 9 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Chimica Università di Firenze and Consorzio Interuniversitario di Scienza e Tecnologia dei Materiali (INSTM) Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy. Istituto di Fisica del Plasma (IFP-CNR) Via R. Cozzi 53, 20125 Milano, Italy (literal)
Titolo
  • Interaction between an imidazolium based ionic liquid and the AZ91D magnesium alloy (literal)
Abstract
  • Mg alloys are commonly used in various industrial sectors, especially in the automotive one[1] because of their low weight and high mechanical strength. The main drawback of these materials is the poor corrosion resistance in atmospher- ic and saline environments especially caused by hydrogen corrosion. One of the most resistant, and therefore among the most investigated, of these alloys is the die-cast AZ91D. For this, alloy several studies have been conducted to investigate the corrosion mechanism in saline environment.[2,3] However, a complete characterization in non aqueous environments is still missing. Such a these studies could present interesting insights on the corrosion mechanism of these alloys because of the absence of water in these environments which almost totally eliminates hydrogen corrosion. In particular, Ionic Liq- uids (ILs) may offer a suitable environment for this purpose. In the last few years ionic compounds liquid at room tem- perature (called ionic liquids (ILs)) attracted the attention of several research groups for their interesting properties: low viscosity, non flammability, extremely low vapour pressures, high thermal stability and being liquid in a wide range of temperatures.[4,5] A detailed description of the main chemical and physical properties of such class of compounds can be found in two recent reviews.[6,7] Among ionic liquids, imidazolium based ones show inter- esting properties in terms of low viscosity[8] as well as ther- mal stability,[9] consequently they seems to be very promising as lubricant materials,[10,11] especially for aluminium contain- ing alloys.[12,13] The non-miscibility with water presented by several ILs makes them interesting materials that might to be suitable to get in contact with magnesium and magnesium alloys. In the present work, we report on the characterization of the interaction of an imidazolium based IL and the surface of the AZ91D alloy. The ionic liquid used was composed of of 1-butyl-3-methyl-imidazolium as cation and bis (trifluoro- methylsulfonyl) imide as anion ([C4mim][Tf2N]). The expo- sure was conducted both at room temperature and at 200 °C. Our focus was on the chemical and physical monitoring of the surface evolution. To perform the study we monitored the variation of the surface average roughness by a profilograph and investigated the morphology of the sample by electron microscopy. The surface chemical composition was deter- mined by electron dispersive X-ray (EDX) microanalysis as well as by X-ray Photoelectron Spectroscopy (XPS). Since the interaction layer formed after few days is thicker than the depth the investigated by the XPS, the method provided mea- surements of the elemental composition of the outermost part of the surface, while the average composition was supplied by EDX. The combined use of these techniques allowed us to differentiate the outermost part of the interaction layer from the deeper part. Moreover, XPS determines the chemical status of the elements detected and therefore monitors the evolution of the chemical species constituting the surface layer of the tested samples. (literal)
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