Size matters: Mechanism of metal release from 316L stainless steel particles is governed by size-dependent properties of the surface oxide
2014 (English)In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 122, 223-226 p.Article in journal (Refereed) Published
Size-dependent health aspects due to exposure to micro- or nano-sized particles can only be fully understood if their physicochemical properties are well characterized. The aim of this study was to explain the process of metal release from well-characterized inert gas atomized stainless steel 316L particles, sized < 4 gm (fine) and < 45 gm (coarse), in aggressive environments of relevance for inhalation and cellular uptake. This was accomplished by correlating new results from real-time metal release measurements with particle- and surface oxide characteristics. In simulated biological media with complexing properties, a complexation (ligand)-induced dissolution mechanism is dominating the metal release from fine 316L particles (having a homogeneous and amorphous Mn-rich surface oxide due to rapid cooling). At similar conditions, the coarse 316L particles show a metal release mechanism dominated by fast dissolution of surface oxide nanoparticles (rich in Mn, Fe, and some S), acting as initiation sites for metastable pitting corrosion.
Place, publisher, year, edition, pages
2014. Vol. 122, 223-226 p.
Stainless steel, Particle size, Metal release, Complexation, Surface oxide, Surface speciation
IdentifiersURN: urn:nbn:se:kth:diva-145817DOI: 10.1016/j.matlet.2014.02.034ISI: 000335109500058ScopusID: 2-s2.0-84897722478OAI: oai:DiVA.org:kth-145817DiVA: diva2:720655
FunderSwedish Research Council
QC 201406022014-06-022014-06-022014-06-02Bibliographically approved