Preparation of polyoxometalate ionic liquids (POM‐ILs) coated on metal coins for anticorrosion activity

In this article, we have synthesized two energetic polyoxometalates(POMs) based ionic liquids. FT-IR, SEM, Electrochemical Impedance Spectroscopy(EIS), Optical Imaging Microscopy(OIM), Rheological analysis, 1HNMR and TGA techniques were used to characterize the corresponding ionic liquids. The acid resistant V@POM-IL and W@POM-IL were used for coating of coin samples. The uncoated coins have shown corrosion with holes production when treated with HCl but POM based ionic liquid coated coins have shown resistant against corrosion and no cracking or hole making was noticed. TGA results of W@POM-IL have shown the minimum weight loss (4.3%) and V@POM-IL has maximum weight loss (9.2%) at highest temperature (500 0C). The corrosion results have shown that un-coated coin has lost weight of 10.67% and coated coins with V@POM-IL and W@POM-IL lost weight with 2.67% and 0.67% respectively. Electrochemical impedance measurement (EIS) has charge transfer ratio of 7.03, 5.23 and 3.78 Ω for W@POM-IL, V@POM-IL and uncoated coin respectively. Rheological analysis with highest elastic modulus (103 Pa) and viscous modulus (103 Pa) of W@POM-IL has given best coating properties.