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Galvanized steel in outdoor constructions - metal runoff, corrosion and patina formation
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: US-AB , 2010. , vii, 41 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2010:37
National Category
Other Basic Medicine
Identifiers
URN: urn:nbn:se:kth:diva-28615ISBN: 978-91-7415-731-4 (print)OAI: oai:DiVA.org:kth-28615DiVA: diva2:388455
Presentation
2010-12-20, YKI, konferensrum 3, KTH, Drottning Kristinas väg 45, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20110117Available from: 2011-01-17 Created: 2011-01-17 Last updated: 2011-01-18Bibliographically approved
List of papers
1. Long-term use of galvanized steel in external applications. Aspects of patina formation, zinc runoff, barrier properties of surface treatments, and coatings and environmental fate
Open this publication in new window or tab >>Long-term use of galvanized steel in external applications. Aspects of patina formation, zinc runoff, barrier properties of surface treatments, and coatings and environmental fate
2011 (English)In: Environmental Monitoring & Assessment, ISSN 0167-6369, E-ISSN 1573-2959, Vol. 173, 139-153 p.Article in journal (Refereed) Published
Abstract [en]

Galvanized steel structures are used in a large variety of external constructions in the modern urban society, and their beneficial properties from a corrosion and oxidation perspective are well known. Less investigated is the extent of their contribution to the diffuse dispersion of zinc in the society and also to the environmental fate of corrosion-induced released zinc. This paper presents long-term runoff rates of zinc from galvanized steel surfaces with main focus on hot-dipped galvanized steel exposed for up to 10 years at nonsheltered urban atmospheric conditions. The long-term capacities of a naturally formed patina and the presence of surface treatments and coatings to hinder and reduce corrosion-induced zinc runoff from galvanized steel are elucidated. The environmental interaction of zinc runoff and concrete surfaces in pavement and urban storm drain systems is highlighted and the high capacity of concrete to retain released zinc presented.

Place, publisher, year, edition, pages
Dordrecht, Netherlands: Springer Science+Business Media B.V., 2011
Keyword
Hot-dipped galvanized steel, Galvanized steel, Corrosion, Zinc runoff, Patina, Surface treatments, Coatings
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-28199 (URN)10.1007/s10661-010-1377-8 (DOI)000287982000013 ()2-s2.0-79151480444 (Scopus ID)
Note
QC 20110117Available from: 2011-01-17 Created: 2011-01-10 Last updated: 2017-12-11Bibliographically approved
2. Chromium(III) and Chromium(VI) Surface Treated Galvanized Steel for Outdoor Constructions: Environmental Aspects
Open this publication in new window or tab >>Chromium(III) and Chromium(VI) Surface Treated Galvanized Steel for Outdoor Constructions: Environmental Aspects
2010 (English)In: Environmental Science and Technology, ISSN 1086-931X, E-ISSN 1520-6912, Vol. 44, no 11, 4322-4327 p.Article in journal (Refereed) Published
Abstract [en]

The long-term degradation of chromium(III) (Zn-Cr(III)) and chromium(VI)-based (Zn-Cr(VI)) surface treatments on galvanized steel and their capacities to hinder the release of zinc induced by atmospheric corrosion at non-sheltered urban and marine exposure conditions for two years are investigated.

Compared to bare zinc sheet, both surface treatments revealed high corrosion protection abilities and capacities to hinder the release of zinc, still evident after two years of exposure. The zinc barrier properties of the thinner Zn-Cr(VI) (10 nm) treatment were during the first 100 days of urban exposure slightly improved compared with Zn-Cr(III) (35 nm). However, their long-term protection capacities were inversed. 

Released concentrations of total chromium correspond to annual release rates less than 0.000032 (Zn-Cr(III)) and 0.00014 g Cr m-2yr-1 (Zn-Cr(VI)) after one year of urban exposure. Ageing by indoor storage of the surface treatments prior to outdoor exposure reduced the released Cr concentrations from the surface treatments. No Cr(VI) was released from the aged surfaces but from the freshly exposed Zn-Cr(VI).  

Marine exposure conditions resulted in a faster reduction of chromate to chromium(III)oxide compared with urban conditions, and a significantly lower amount of both chromium(III) and chromium(VI) released from Zn-Cr(VI) at the marine site compared with the urban site.

Keyword
Barrier properties, Chromium oxides, Cr concentration, Environmental aspects, Galvanized steels, Indoor storage, Marine exposure, Outdoor exposure, Protection capacity, Release rate, Total chromium, Urban conditions, Urban exposure, Urban site, Zinc sheets, Atmospheric corrosion, Chromates, Galvanized metal, Galvanizing, Zinc
National Category
Chemical Sciences Other Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-24693 (URN)10.1021/es1003022 (DOI)000278003500047 ()2-s2.0-77952893663 (Scopus ID)
Note
QC 20101006Available from: 2010-09-22 Created: 2010-09-22 Last updated: 2017-12-12Bibliographically approved

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