Fig. 4: Surface element contents of L304 steels.
From: Significant reduction of corrosion of stainless steel by strong-field laser surface passivation
a XPS spectra; b XPS high-resolution Fe 2p spectrum; c XPS high-resolution Cr 2p spectrum; d XPS depth profiles obtained from the sputtering time of 0, 15, 30, 90 min, respectively; e ToF- SIMS depth profiles. f 3D ToF–SIMS image of CrO2−, FeO2−, 18O−, Fe2−, Ni2− and Cr2−
