Fig. 4

XRF data collected during exposure to 1 M NaCl solution at room temperature at step-wisely increased potentials showing detected elements in the electrolyte: a Fe, b Ni, c Mo, and d Cr, respectively. All potentials are given with respect to Ag/AgCl (sat.). The signal peaks indicate enhanced dissolution of the elements (no peak was detected in the passive condition except a small one for Fe)