The Effect of Deposition Conditions on Atmospheric Pitting Corrosion Location Under Evans Droplets on Type 304L Stainless Steel

Abstract

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Influence of Realistic, Cyclic Atmospheric Cycles on the Pitting Corrosion of Austenitic Stainless Steels

“…Developed cyclic exposure environment has similar pitting damage in comparison to static exposures.-Pitting morphologies present in the current study (Figs. 7 and 8) were similar to other atmospheric exposures of SS alloys, [2][3][4][5][6][7]9,20,[33][34][35][36][37] indicating that the developed cycle (Table II) did not significantly influence pitting morphologies. Further, while a direct comparison of observed pit sizes is convoluted due to different profilometers and selection criterion utilized, pit sizes (Fig.…”

Effect of Microstructure on the Morphology of Atmospheric Corrosion Pits in Type 304L Stainless Steel

“…Atmospheric pitting corrosion of austenitic stainless steels has been investigated by a number of researchers. [1][2][3][4][5][6][7][8][9][10][11] It is of significant interest to the nuclear waste industry in the United Kingdom as intermediate-level nuclear waste (ILW) is currently stored in containers made from Types 304L and 316L austenitic stainless steels (UNS S30403 and S31603, respectively (1) ). Future plans are for ILW containers to be held in an underground geological disposal facility (GDF).…”

“…The formation of small pits has been observed even when low chloride deposition densities are present. 11,[14][15] It is important to establish any conditions under which atmospheric pitting corrosion may develop into atmospherically-induced stress corrosion cracking (AISCC), which might cause containers to fail when they are being moved to the GDF once it is completed.…”

The evolution of pit morphology and growth kinetics in aluminum during atmospheric corrosion

“…Notably, Al generally has excellent corrosion resistance due to the dense oxide film on its surface and this must be compromised by chloride ions before pit nucleation can occur 32,33 . Nucleation at a droplet edge, where a relatively higher flux of oxygen is expected than near the droplet center, suggests that oxygen flux was critical to nucleation 34 . In Al alloys, pits have been observed to preferentially nucleate at the intersection of droplet edges with microstructural features susceptible to pitting, e.g.…”