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Influence of Mechanical Stress on the Potential Distribution on a 301 LN Stainless Steel Surface
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-9045-9696
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-0980-0560
French Corrosion Institute.
French Corrosion Institute.
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2015 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, C465-C472 p.Article in journal (Refereed) Published
Abstract [en]

The aim of the present work was to study the influence of the stress on the electrode potential of the austenitic stainless steel301LN using Scanning Kelvin Probe (SKP). It was found that elastic deformation reversibly ennobles the potential whereas plasticdeformation decreases the potential in both tensile and compressive deformation mode and this decrease is retained even 24 h afterremoval of the load. To interpret the stress effects, different surface preparations were used and the composition and thickness ofthe passive film were determined by GDOES. Slip steps formed due to plastic deformation were observed using AFM. The effect ofplastic strain on the potential is explained by the formation of dislocations, which creates more a defective passive film.

Place, publisher, year, edition, pages
Electrochemical Society, 2015. C465-C472 p.
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:kth:diva-186201DOI: 10.1149/2.0511509jesOAI: oai:DiVA.org:kth-186201DiVA: diva2:926119
Note

QC 20160516

Available from: 2016-05-04 Created: 2016-05-04 Last updated: 2017-11-30Bibliographically approved
In thesis
1. Use of local electrochemical techniques for corrosion studies of stainless steels
Open this publication in new window or tab >>Use of local electrochemical techniques for corrosion studies of stainless steels
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The excellent corrosion resistance of stainless steels arises from the presence of a passive film on its surface. Above 10.5wt% Cr a chromium oxide of 1-3 nm is formed on the surface of the metal that in case of damage will reform and hinder further dissolution of the metal. However, the passivity of the stainless steel can be altered by material factors and external factors; such as the composition of the underlying phases, external loads or thermal treatments.

In this work the local electrochemical techniques Scanning Vibrating Electrode Technique (SVET) and Scanning Kelvin Probe Force Microscopy (SKPFM) and the local characterization techniques X-ray Photoelectron Spectroscopy (XPS) and Auger Electron Spectroscopy (AES) have been used to investigate corrosion phenomena of stainless alloys based on measurements of corrosion current density, work function, thickness and composition of the oxide.

The effect on work function of the thickness of the passive film and composition of the underlying phases was investigated for 301LN austenitic stainless steel (Paper I) and a heat treated superduplex 25Cr7Ni type stainless steel (Paper II). It was shown that the work function can be an indicator of corrosion resistance of the phases in the microstructure, and that the composition of the underlying phases had a greater effect on the work function than the thickness of the passive film.

External factors such mechanical deformation (Paper I) and welding (Paper III) altered the passivity of the steel and work function. It was found that plastic deformation decreased irreversibly the work function, whereas elastic deformation did not have any permanent effect. Thermal oxides affected the passivity of stainless steels welded joints and were detrimental for its corrosion resistance. Anodic activity, observed with SVET, and pitting corrosion were detected at the heat tint and attributed to the interaction between the composition and the thickness of the oxide. Brushing combined with pickling was recommended for recovering the passivity of stainless steels.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 68 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2016:24
Keyword
Stainless steel, passive film, thermal oxides, work function, pickling, SKPFM, SVET, XPS, AES
National Category
Corrosion Engineering
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-186206 (URN)978-91-7729-002-5 (ISBN)
Presentation
2016-06-09, sal K53, Teknikringen 28, Stockholm, 13:00 (English)
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Note

QC 20160516

Available from: 2016-05-16 Created: 2016-05-04 Last updated: 2016-05-26Bibliographically approved

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Fuertes, Nuria

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