Fig. 6 | npj Materials Degradation

Fig. 6

From: Redefining passivity breakdown of super duplex stainless steel by electrochemical operando synchrotron near surface X-ray analyses

Fig. 6

GIXRD diffraction patterns obtained from the outermost surface (~50 nm penetration depth) before exposure (dark line), during exposure to the electrolyte after polarization (but still applied) to 900 mV/Ag/AgCl (red line), and after termination of the polarization to 1400 mV/Ag/AgCl (blue line): a showing peak shifts of ferrite and austenite phases indicating preferential dissolution of Fe, b showing peak-signal intensity increase of the passive film and the formation of new peaks, c magnified view of the highlighted region denoted as no. 1 in b showing peak shift for Cr-oxide indicating lattice expansion, and d magnified view of the highlighted region no. 2 in b showing no change of the peak positions for Fe-oxide but for Cr-oxide, and also the formation of new peaks indicating new oxide/hydroxide constituent(s)

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