Halogen-Free Phosphonate Ionic Liquids as Precursors of Abrasion Resistant Surface Layers on AZ31B Magnesium Alloy
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Research GroupCiencia de Materiales e Ingeniería Metalúrgica
Knowledge AreaCiencia de los Materiales e Ingeniería Metalúrgica
SponsorsThe authors wish to thank the financial support of the Ministerio de Economía y Competitividad (MINECO, Spain), grants: MAT2011-23162 and MAT2014-55384-P. T. Espinosa is grateful to Ministerio de Educación, Cultura y Deporte (MECD, Spain) for a research FPU grant (AP2010-3485).
Bibliographic CitationEspinosa, T.; Sanes, J.; Bermúdez, M.D. Halogen-free phosphonate ionic liquids as precursors of abrasion resistant surface layers on AZ31B magnesium alloy. Coatings. 2015, 5, 39-53
Surface coatings formed by immersion in the ionic liquids (ILs) 1,3-dimethylimidazolium methylphosphonate (LMP101), 1-ethyl-3-methylimidazolium methylphosphonate (LMP102) and 1-ethyl-3-methylimidazolium ethylphosphonate (LEP102) on magnesium alloy AZ31B at 50 °C have been studied. The purpose of increasing the temperature was to reduce the immersion time, from 14 days at room temperature, to 48 hours at 50 °C. The abrasion resistance of the coated alloy was studied by microscratching under progressively increasing load, and compared with that of the uncoated material. The order of abrasion resistance as a function of the IL is LEP102 > LMP101 > LMP102, which is in agreement with the order obtained for the coatings grown at room temperature. The maximum reduction in penetration depth with respect to the uncovered alloy, of a 44.5%, is obtained for the sample treated with the ethylphosphonate LEP102. However, this reduction is lower than that obtained when the coating is grown at room ...
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