Ionic macromolecules based on non-halide counter anions for super prevention of copper corrosion

New non-halide counter anions based ionic macromolecules (IMs) were synthesized by the ionic exchange method. The molecular aggregates of the target IMs were formed in H2SO4 medium. The evolving concentrations and time showed a remarkable influence on the formation of the IMs aggregates. Copper surface could be adsorbed by the IMs, which were confirmed by the SEM as well as AFM imaging. The contacting angles suggest that the adsorption layers of the IMs on metal surface could be composed by the inner hydrophobic film and the outer hydrophilic film. The IMs-copper bonding was further demonstrated by different means including FT-IR and XPS. The electrochemistry survey suggested that the IMs adsorption layers inhibited copper corrosion in H2SO4 solution, and the peak efficiency of corrosion inhibition reached over 99%. In addition, the mixed chemisorption and physisorption of the IMs to copper is reveled by the Langmuir isotherms. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

New non-halide counter anions based ionic macromolecules (IMs) were synthesized by the ionic exchange method and formed molecular aggregates in H2SO4 medium. The IMs could adsorb on copper surface and form adsorption layers composed of inner hydrophobic film and outer hydrophilic film. Electrochemical study showed that the IMs could effectively inhibit copper corrosion in H2SO4 solution.