Corrosion resistances and passivation of powder metallurgical and conventionally cast 316L and 2205 stainless steels
By Fredriksson, Wendy; Petrini, Daniel; Edström, Kristina; Björefors, Fredrik & Nyholm, Leif
Published in Corrosion Science
NULL
2013
Abstract
The corrosion resistances and passivation of austenitic 316L and duplex 2205 powder metallurgical (P/M) steels, produced by gas atomizing and hot isostatic pressing (HIP), have been compared with those of their conventional cast counterparts. P/M 316L steel is shown to have significantly higher pitting corrosion resistance than conventional 316L steel in 0.5 M HCl. This effect is ascribed to the fine grained microstructure of the P/M 316L steel yielding an improved passive layer. The latter hypothesis is supported by photoelectron spectroscopy data demonstrating differences between the thickness and composition of the passive layers for the 316L steels.
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