Surface and corrosion properties of modified passive layer on 304 stainless steel as bipolar plates for PEMFCs

Investigation on the Relationship between the Surface Chemistry and the Corrosion Resistance of Electrochemically Nitrided AISI 304 Stainless Steel

“…The binding energies are in good agreement with the literature [33][34][35]. Metallic iron signal arises from the steel substrate [6]. The results point that the surface of the untreated sample contains both iron and chromium oxides and hydroxides but nitrides are not present.…”

“…Fitting of these spectra showed two components for all samples, O 2− and OH − . These species are typical of stainless steel passive films and also for nitrided layers [6,38,39]. The fitted data are displayed in Table 6.…”

“…It is interesting to note that the N sample presents a higher content of Ni0 when compared with the NK sample which, in turn, shows Ni 0 content compatible with that of the untreated steel. According to Dadfar et al [6] the signal of the metallic substrate is an indication that the surface film is not homogeneous. Likewise, the stronger Ni 0 signal for the N sample suggests that its nitrided layer can be less homogeneous when compared to that of the NK sample.…”

“…Stainless steels are prone to localized corrosion in contact with chloride-containing solutions [1][2][3]. The stability of the naturally formed passive film accounts for its corrosion resistance in a variety of environments [4][5][6]. One promising way of increasing the reliability of stainless steels is to increase passive film stability [7,8].…”

Corrosion Resistance of Anodic Layers Grown on 304L Stainless Steel at Different Anodizing Times and Stirring Speeds

“…In recent years, surface engineering has developed physical, chemical, mechanical, and microstructural modification treatments on steel to expand the range of applications. Literature is quite extensive about the surface treatments carried out to date [1][2][3][4][5][6]. Nevertheless, the anodizing process that was initially developed for aluminum alloys [7,8] and later for other metals, such as Mg [9], Ga [10], Co [11], W [12], Nb [13], Zr [14], Sn [15], and Ti [16,17], has emerged as a new alternative to surface functionalization of iron base alloys of particular interest in fields such as photocatalysis, sensors, corrosion, environmental remediation, and biomedical to name a few [18][19][20][21][22][23][24][25][26][27][28][29][30].…”