Abstract
Strong Negative Difference Effect (NDE) is present on Mg alloys in [mPEGnMPyr]ClO4-H2O and [BMPyr]AcO-H2O but not in [mPEGnMPyr]AcO-H2O mixtures. The role of [mPEGnMPyr]+ and its synergy with AcO- in water-ionic liquids mixtures were characterized combining surface analysis by ToF-SIMS, surface and solution analysis by vibration spectroscopies and molecular dynamics simulations. The NDE was explained by the “free” water phase formation when Mg2+-ions expel water initially H-bonded with AcO-. Oxygen atoms of [mPEGnMPyr]+ can bond the released water, inhibiting the NDE. Water transport can be reduced by a condensed film, formed by [mPEGnMPyr]+ and AcO- coordinated with Mg2+ and Al3+.
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