Electrochemical detection of cupric ions with boron-doped diamond electrode for marine corrosion monitoring
By Nie, M.; Neodo, S.; Wharton, J. A.; Cranny, A.; Harris, N. R.; Wood, R. J. K.; Stokes, K. R.
Published in Electrochimica Acta
2016
Abstract
Abstract Corrosion induced structural failures continue to be a costly problem in many industrial situations, and the development of robust corrosion sensing systems for structural health integrity monitoring is still a demanding challenge. The applicability of corrosion monitoring of copper alloys using a boron-doped diamond electrode (BDD) has been performed based on determination of copper ions within localised corrosion microenvironments. The electrochemical behaviour of copper ions on the {BDD} electrode surface were first reported in details in 0.60 M NaCl aqueous solution, and the results revealed that the electrochemical processes of copper ions on the {BDD} electrode proceed as two successive single electron transfer steps producing two well-separated pairs of peaks in cyclic voltammograms in the chloride ion containing electrolyte solutions. Compared with perchlorate and sulphate ions, chloride ions were observed with a significant stabilization effect on copper ions via the formation of CuCl2? complex, thus having two well-separated pairs of peaks in the obtained cyclic voltammograms on the {BDD} electrode in the chloride ion electrolyte solution. The apparent rate constant for the redox couple of Cu2+/Cu+ in chloride ion electrolyte was determined as 0.94