Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Limiting conditions of pitting corrosion for lean duplex stainless steel as a substitute for standard austenitic grades
Avesta Research Centre, Outokumpu Stainless steel AB, Avesta, Sweden. (Surface and corrosion science)ORCID iD: 0000-0001-8182-6530
Jernkontoret, The Swedish Steel Producers' Association Stockholm, Stockholm, Sweden.ORCID iD: 0000-0002-0980-0560
2014 (English)In: Proceedings EUROCORR Conference 2014, 2014Conference paper, Published paper (Other (popular science, discussion, etc.))
Abstract [en]

Lean duplex stainless steels such as EN 1.4162 (LDX 2101Ò) are today used in many applications where they can substitute for the standard austenitic stainless steel 304L and 316L. The advantages include higher strength, better resistance to stress corrosion cracking, good uniform corrosion resistance and better price stability due to the lower nickel content.

This paper focuses on the performance of the lean duplex stainless steel LDX 2101Ò as a substitute for type 304L and 316L in chloride containing environments ranging from potable water to seawater. A combination of short term electrochemical testing and long term exposures is used to investigate the tendency to pitting corrosion as a function of chloride concentration and temperature. This is used to define the limiting conditions for pitting corrosion and construct engineering diagrams showing the risk areas for localised corrosion as a function of environmental parameters. Results are discussed in terms of the role of alloying elements and microstructure.

 

Place, publisher, year, edition, pages
2014.
Keywords [en]
Lean duplex stainless steel, EN 1.4162 (LDX 2101Ò), temperature, potential, chloride concentration, pitting potential, engineering diagram.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kth:diva-263813OAI: oai:DiVA.org:kth-263813DiVA, id: diva2:1370288
Conference
EUROCORR Conference 2014, 8-12 September 2014, Pisa, Italy
Note

QC 20191115

Available from: 2019-11-14 Created: 2019-11-14 Last updated: 2019-11-19Bibliographically approved
In thesis
1. Localised corrosion and atmospheric corrosion of stainless steels
Open this publication in new window or tab >>Localised corrosion and atmospheric corrosion of stainless steels
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This research is focused on defining limiting conditions for corrosion of stainless steels. The aim of the first part (Papers I-IV) was to understand the role of alloying level and environmental parameters on localised corrosion in aqueous conditions. Testing was done with a combination of short-term electrochemical and long-term immersion experiments. Results show that the chloride ion concentration and temperature are the main factors that affect the localised corrosion resistance. The presence of residual chlorine is also significant, since it leads to the ennoblement of the corrosion potential. If the corrosion potential exceeds the breakdown potential, the stainless steel will suffer from localised corrosion. Oxygen content and pH were identified as additional factors influencing the corrosivity of the environment.

The aim of second part (Papers V-VIII) was to present information about the effect of alloying level, surface condition and environmental conditions on atmospheric corrosion resistance in Middle-East environments. Field exposure tests were performed and supplemented by laboratory aqueous corrosion tests. Results demonstrate that a higher alloying level (in both the bulk material and the surface), plus a smoother and cleaner surface gave an improvement in the corrosion performance and resistance to aesthetic degradation. Chloride and sulphate are the main surface contaminants found in the Middle East atmosphere. Stainless steels exposed in sheltered conditions showed a better atmospheric corrosion resistance than in open conditions. Three factors are considered to contribute to this difference: a very low rainfall, more condensation leading to corrosion in the open conditions and a higher level of beneficial sulphate in the deposits in sheltered conditions. The results showed a reasonable correlation between laboratory pitting corrosion tests and atmospheric field tests.

The results from this thesis provide reference data to aid selection of appropriate stainless steel grades. Results can also be used to help understand the limits for use of stainless steels in different conditions in both aqueous environments and in the atmosphere.

Abstract [sv]

Denna avhandling inriktar sig på att definiera gränser för korrosion hos rostfria stål. Syftet med den första delen (Artikel I-IV) var att förstå inverkan av legeringssammansättning och miljöparametrar på lokal korrosion i vattenlösningar. En kombination av elektrokemiska korttidsförsök och långvarig provning har utförts. Resultaten visar att kloridhalten och temperaturen är de två viktigaste faktorerna som påverkar den lokala korrosionsbeständigheten hos rostfritt stål. Närvaro av kvarvarande klor är också en betydande faktor som leder till att korrosionspotentialen ökar. Om korrosionspotentialen når genombrottspotentialen drabbas det rostfria stålet av lokal korrosion. Syreinnehåll och pH visade sig vara ytterligare faktorer som påverkar miljöns korrosivitet. Syftet med den andra delen (Artikel V-VIII) var att presentera information om hur olika legeringsämnen, yttillstånd och miljöparametrar påverkar den atmosfäriska korrosionsbeständigheten i Mellanöstern. Fälttester har utförts i kombination med korrosionstester i laboratoriet. Resultaten visar att ett högre legeringsinnehåll (i både bulkmaterialet och på ytan), samt en jämnare och rengjord yta gav en förbättring av korrosionsegenskaperna. Klorid och sulfat är de två huvudsakliga föroreningarna som finns i Mellanösterns atmosfär. Rostfria stål exponerade under skyddade förhållanden uppvisade en bättre korrosionsbeständighet än under öppna förhållanden. Tre faktorer anses bidra till denna skillnad: en mycket låg nederbörd, mer kondens som leder till korrosion under öppna förhållanden och en högre nivå av gynnsamt sulfat i avlagringar under skyddade förhållanden. Resultaten visade också en rimlig korrelation mellan laboratorietester och de atmosfäriska fälttesterna. Resultaten från forskningen ger referensdata som kan användas som stöd för materialval och för att lättare kunna välja rätt rostfri stålsort. Resultaten kan också användas för att förstå gränser för rostfritt stål gällande lokal korrosion i olika miljöer.

Place, publisher, year, edition, pages
KTH: KTH, 2019. p. 109
Series
TRITA-CBH-FOU ; 2019:56
Keywords
stainless steel, localised corrosion, atmospheric corrosion, alloy composition, surface finish, surface roughness, surface treatment, surface orientation, contamination, chloride, sulphate, temperature, chlorination, exposure conditions.
National Category
Other Engineering and Technologies not elsewhere specified
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-263756 (URN)978-91-7873-330-9 (ISBN)
Public defence
2019-12-13, F3, Lindstedtsvägen 26, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 2019-11-19

Available from: 2019-11-19 Created: 2019-11-12 Last updated: 2019-11-21Bibliographically approved

Open Access in DiVA

fulltext(1170 kB)6 downloads
File information
File name FULLTEXT01.pdfFile size 1170 kBChecksum SHA-512
663087ab81f8f91a3787c37b4ec5a5720c0b9133d8821b038c8b84373cf9b47785e8e8a8be05dddfc6ab68ec7cab4a96d860234902c2debcb5117e813bb0e7c5
Type fulltextMimetype application/pdf

Other links

Conference website

Search in DiVA

By author/editor
Hägg Mameng, SukanyaPettersson, Rachel
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 6 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 23 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf