AES of thin oxide layers on a duplex stainless steel surface

Abstract

Thin oxide layers were produced by exposing polished and ion-sputtered duplex stainless steel surfaces to ambient conditions for 24 h. Another type of oxide layer was produced in a plasma passivation chamber. These layers were then studied using SEM and high-resolution Auger electron spectroscopy (AES) profiling. The exposure under ambient conditions and the plasma passivation procedure produced broadly similar layers with thicknesses up to several nanometers. A stratified structure was observed for the Fe-oxide/Cr-oxide layers. The results were compared with those obtained in an x-ray photoelectron spectroscopy (XPS) study of the same system. Linear least-squares fitting was used to resolve the partially overlapping O and Cr Auger peaks at 510 and 530 eV, thus improving the accuracy of the AES depth profile.

Austenitic and duplex stainless steels in simulated physiological solution characterized by electrochemical and X‐ray photoelectron spectroscopy studies

“…Nickel appears in the layer, but is strongly depleted compared to the bulk content. Previous reported works have confirmed that for stainless steels, the amount of nickel present in the passive film is very small 16–19…”

X-Ray Photoelectron Spectroscopy Depth Profiling of Electrochemically Prepared Thin Oxide Layers on Duplex Stainless Steel

“…This is, according to Olsson, [35] one possible mechanism of synergism between Mo and N in DSS 2205. [10] Mo vs all metals atomic ratio dependence on depth sample oxidized at À0.15 V (SCE) is shown in Figure 4(b). The ratio is considerably increased inside the oxide layer, and approaches the bulk value with sputtering.…”

“…[10,[36][37][38] The passivity of the stainless steels results from the high corrosion resistance exhibited by the Cr(III)-oxide hydroxides present in the passivating layers. The role of the alloyed Cr in enhancing the passivity of stainless steels is frequently explained in terms of a percolation model of passivation.…”

“…The corrosion resistance originates from a Cr-rich oxide layer, which works as a barrier against ion diffusion between the alloy and the ambient phase. [2][3][4][5][6][7][8][9][10][11] Custom steel grades are designed for specific applications by optimizing their properties using specific alloy compositions. The alloy selected for this study was a 22 wt pct Cr, 5 to 6 wt pct Ni, 3 wt pct Mo, 2 wt pct manganese, and N-alloyed duplex stainless steel (DSS 2205 also known as W.Nr.…”

Oxide state evaluation of magnesium and calcium in thin metallic film using Auger electron spectroscopy depth profiles

“…13 Sometimes, LLSF fitting can also help to resolve peak overlapping problems where complex spectral patterns, due to overlap, are fitted with linear combinations of components that are subsequently quantified (e.g. Ref. 14).…”