Combined XPS / TEM study of the chemical composition and structure of the passive film formed on additive manufactured 17-4PH stainless steel
Abstract
he structure and chemical composition of the passive film formed on 17-4PH martensitic stainless steel (MSS) manufactured by powder bed laser beam melting (LBM) were investigated combining XPS and TEM analyses, by comparison to a conventional l 7-4PH. The structure of the passive film was found similar for both MSSs, with, on the matrix, a duplex layer composed of Fe and Cr oxy-hydroxide followed by an intermediate layer enriched in metallic compounds. A particular Nb oxide film formed on the NbC precipitates merging to the surface for both MSSs. Significant differences in thickness and Cr distribution were observed between both MSSs.
Domains
Material chemistry
Origin : Files produced by the author(s)