Induction and pore-formed stages in Al2Au’s dealloying process in HCl solutions
School of Engineering
National Natural Science Foundation of China
© 2020 Elsevier Ltd Two stages, induction stage and pore-formed stage, were distinguished in Al2Au's dealloying process in HCl solutions by OCP, SEM and XPS characterization. In induction stage, the Au state with binding energy 85.4 eV (labelled as Al2Au (I)) was transformed into the state 84.7 eV (Al2Au (II)); in pore-formed stage, nanoporous structure started to be formed, Al2Au (II) and residual Al2Au (I) were transformed into the state 83.7 eV (pure Au). Multi-resolution analysis on OCP noise revealed that the induction stage and pore-formed stage undergo different corrosion modes: the former is local corrosion and the latter is global corrosion.