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Factors that influence the release of metals from stainless steels exposed to physiological media
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Corrosion Science.ORCID iD: 0000-0002-2123-2201
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Corrosion Science.ORCID iD: 0000-0003-2206-0082
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Corrosion Science.ORCID iD: 0000-0002-9453-1333
2006 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 48, no 8, 2120-2132 p.Article in journal (Refereed) Published
Abstract [en]

Release rates of chromium, nickel and iron from grade 304 stainless steel with three different surface finishes, BA, 2B and 2D, have been determined after exposure to artificial lysosomal fluid. Metal release rates are discussed in relation to corrosion resistance, compositional changes of the outermost surface film of the stainless steel and to measurements of the effective surface area and roughness. The total metal release decreased in the following sequence: 2D > 2B approximate to BA, and was primarily related to the electrochemically active surface area. No direct correlation was observed between corrosion resistance and metal release rates.

Place, publisher, year, edition, pages
2006. Vol. 48, no 8, 2120-2132 p.
Keyword [en]
stainless steel; EIS; XPS; passive film
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-8526DOI: 10.1016/j.corsci.2005.08.006ISI: 000240055200017Scopus ID: 2-s2.0-33746266425OAI: oai:DiVA.org:kth-8526DiVA: diva2:13874
Note
QC 20100810Available from: 2008-05-27 Created: 2008-05-27 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Bioaccessibility of Stainless Steels: Importance of Bulk and Surface Features
Open this publication in new window or tab >>Bioaccessibility of Stainless Steels: Importance of Bulk and Surface Features
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

With increasing environmental awareness, the desire to protect human beings and the environment from adverse effects induced by dispersed metals has become an issue of great concern and interest. New policies, such as REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) within the European Community, have been implemented to reduce hazards posed by the use of chemicals on producers and downstream users. The generation of exposure assessment data and relevant test procedures able to simulate realistic scenarios are essential in such legislative actions.

This doctoral study was initiated to fill knowledge gaps related to the metal release process of stainless steels. A wide range of stainless steel grades, fourteen in total, were investigated. They cover a very broad range of applications, and the focus in the thesis was to simulate a few selected exposure scenarios: precipitation, the human body and food intake. Comparisons were made between metal release from stainless steel alloys and the pure metals that constitute each stainless steel in order to explore the differences between alloys and pure metals, and to provide quantitative data on metal release rates of different alloy constituents. Because of similar surface properties between stainless steel and pure chromium, this metal exhibits similar release rates, whereas iron and nickel exhibit significantly lower release rates as alloy components than as pure metals. Detailed studies were also performed to elucidate possible relations between metal release and steel surface properties. Key parameters turned out to be chromium enrichment of the self-passivating surface film, surface roughness, the electrochemically active surface area and the microstructure of the steel substrate. The degree of metal release increased with decreasing chromium content in the surface oxide, increasing surface roughness, and increasing presence of inhomogeneities in the bulk matrix.

More detailed studies were initiated to possibly correlate the nucleation of metastable pits and the extent of metal release. Evidence was given that metastable pits exist even when the stainless steel is passive, and may cause extremely short-lived bursts of released metal before the surface film repassivates again.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 73 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2008:39
Keyword
Stainless steel, iron, chromium, nickel, corrosion, metal release, artificial rain, synthetic body fluids, acetic acid, surface oxide, surface finish
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-4773 (URN)978-91-7178-977-8 (ISBN)
Public defence
2008-06-03, F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100810Available from: 2008-05-27 Created: 2008-05-27 Last updated: 2010-08-10Bibliographically approved

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Herting, GunillaOdnevall Wallinder, IngerLeygraf, Christofer

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