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Effect of surface finishes on the atmospheric corrosion of duplex grade UNS S32205: results of a field exposure program in Dubai
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0001-8182-6530
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-9453-1333
2016 (English)Conference proceedings (editor) (Other (popular science, discussion, etc.))
Abstract [en]

The duplex grade UNS S32205 is an excellent choice in many marine environments where UNS S31603 is on the borderline in regards to atmospheric corrosion resistance. The properties of S32205 make it well suited for construction with respect to strength, reduced maintenance, durability and long-term service. In marine environments the use of a sufficiently highly alloyed stainless steel, often in combination with a good surface finish and adequate maintenance, is required to maintain pristine surfaces.

The main objective with this paper is to present information about the effect of different surface finishes on the corrosion and aesthetic appearance of the duplex grade S32205 exposed at a marine test site in Dubai, UAE. The results obtained include the effect of characteristics such as surface roughness, surface treatment and surface orientation after several years of exposure. Results show that duplex grade UNS S32205 can be considered for architectural materials in severe marine locations such as the Dubai site. A smooth surface and an appropriate surface treatment give improved corrosion resistance. Chromium and silicon in the passive film were found to be beneficial in terms of resistance to aesthetic degradation. A correlation was observed between aqueous corrosion resistance measured in laboratory pitting corrosion tests and the atmospheric field test results.

Place, publisher, year, edition, pages
NACE International, 2016. , p. 15
Keywords [en]
duplex stainless steel UNS S32205, atmospheric corrosion, appearance, surface finish, pitting
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-263808OAI: oai:DiVA.org:kth-263808DiVA, id: diva2:1370278
Conference
Nace Corrosion Conference 2016
Note

QC 20191210

Available from: 2019-11-14 Created: 2019-11-14 Last updated: 2019-12-10Bibliographically 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

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