Corrosion inhibition of brass by adding imidazolium-based ionic liquid during water disinfection with chlorine dioxide
[Introduction]The brass parts are often confronted with corrosion problem during water disinfection with chlorine dioxide(ClO2),so it is important to find suitable corrosion inhibitors.[Method]The corrosion inhibition efficiency by adding 1-butyl-3-methylimidazole acetate(BMIMAc)or 1-butyl-3-methylimidazole bromide(BMIMBr)to ClO2 solution on the corrosion inhibition of H62 brass was studied by static hanging test,potentiodynamic polarization measurement,corrosion morphology observation,and corrosion product composition analysis.The corrosion inhibition mechanisms of the two kinds of imidazolium-based ionic liquids on brass were discussed by density functional theory(DFT)calculation and molecular dynamics(MD)simulation.[Result]The addition of either BMIMAc or BMIMBr to ClO2 solution could inhibit the corrosion of brass to a certain extent,and the corrosion inhibition effectiveness was increased with the increasing of BMIMAc or BMIMBr concentration.BMIMAc showed better inhibition efficiency on brass than BMIMBr.Both BMIMAc and BMIMBr are cathodic corrosion inhibitors that inhibit cathodic reactions,and their adsorption onto brass surface followed the Langmuir isothermal model.Both BMIMAc and BMIMBr are capable of adsorbing onto brass surface in a parallel arrangement,forming an adsorbent film that can prevent brass from contraction with corrosive media,and slowing down the corrosion of brass further.[Conclusion]The corrosion of brass can be effectively inhibited during water disinfection by adding an appropriate amount of BMIMAc or BMIMBr to ClO2 solution.
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