Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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
Atomospheric corrosion effects on HNO3 - a comparison of laboratory and field exposed copper, zinc and carbon steel
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Corrosion Science.ORCID iD: 0000-0002-9453-1333
2007 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 154, no 5, C249-C254 p.Article in journal (Refereed) Published
Abstract [en]

The present trends with decreasing ambient SO2 levels and unchanged HNO3 levels has resulted in an increased interest in HNO3 as a corrosive pollutant. Despite the fact that ambient SO2 levels are still in general much higher than HNO3 levels, this study shows that HNO3 plays a significant role for the atmospheric corrosion of copper and zinc but not for carbon steel. A comparison of laboratory and field corrosion effects of HNO3 on copper, zinc, and carbon steel is presented. The quantitative agreement between extrapolated laboratory results and field results are good for both copper and zinc and the total corrosion effect can be represented by the sum of two contributions; one from HNO3 and one from remaining corrosion stimulators, including SO2. However, an extrapolation of laboratory results of HNO3-induced corrosion of carbon steel resulted in corrosion effects much lower than the total effect observed in the field. The field data used for comparison are from the international projects model for multipollutant impact and assessment of threshold levels for cultural heritage, with 29 sites in Europe, and Regional Air Pollution in Developing Countries with 12 sites in Asia and 4 in Africa.

Place, publisher, year, edition, pages
2007. Vol. 154, no 5, C249-C254 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-6445DOI: 10.1149/1.2712817ISI: 000245371700027Scopus ID: 2-s2.0-34047179977OAI: oai:DiVA.org:kth-6445DiVA: diva2:11160
Note
Uppdaterad från submitted till published: 20100917 QC 20100917Available from: 2006-11-29 Created: 2006-11-29 Last updated: 2010-09-17Bibliographically approved
In thesis
1. HNO3-Induced Atmospheric Corrosion of Copper, Zinc and Carbon Steel
Open this publication in new window or tab >>HNO3-Induced Atmospheric Corrosion of Copper, Zinc and Carbon Steel
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The role of nitric acid (HNO3) on the atmospheric corrosion of metals has so far received little or no attention. However, the last decades of decreasing sulphur dioxide (SO2) levels and unchanged HNO3 levels in many industrialized countries have resulted in an increased interest in possible HNO3-induced atmospheric corrosion effects. In this study a new method was developed for studying the corrosion effects of HNO3 on metals at well-defined laboratory exposure conditions. The method has enabled studies to be performed on the influence of individual exposure parameters, namely HNO3-concentration, air velocity, temperature and relative humidity, as well as comparisons with newly generated field exposure data.

The corrosion rate and deposition rate of HNO3 on copper was shown to follow a linear increase with HNO3 concentration. The deposition velocity (Vd) of HNO3 increased up to an air velocity of 11.8 cm s-1. Only at a higher air velocity (35.4 cm s-1) the Vd on copper was lower than the Vd on an ideal absorbent, implying the Vd of HNO3 at lower air velocities to be mass-transport limited.

Within the investigated temperature range of 15 to 35 ºC only a minor decrease in the HNO3-induced copper corrosion rate could be observed. The effect of relative humidity (RH) was more evident. Already at 20 % RH a significant corrosion rate could be measured and at 65 % RH the Vd of HNO3 on copper, zinc and carbon steel reached maximum and nearly ideal absorption conditions.

During identical exposure conditions in HNO3-containing atmosphere, the corrosion rate of carbon steel was nearly three times higher than that of copper and zinc. The HNO3-induced corrosion effect of copper, zinc and steel turned out to be significantly higher than that induced by SO2 alone or in combination with either NO2 or O3. This is mainly attributed to the much higher water solubility and reactivity of HNO3 compared to SO2, NO2 and O3. Relative to SO2, zinc exhibits the highest sensitivity to HNO3, followed by copper, and carbon steel with the lowest sensitivity.

Extrapolation of laboratory data to an assumed average outdoor wind velocity of 3.6 m s-1 enabled a good comparison with field data. Despite the fact that ambient SO2 levels are still much higher than HNO3 levels, the results show that HNO3 plays a significant role for the atmospheric corrosion of copper and zinc, but not for carbon steel. The results generated within this doctoral study emphasize the importance of further research on the influence of HNO3 on degradation of other materials, e.g. stone and glass, as well as of other metals.

Place, publisher, year, edition, pages
Stockholm: Kemi, 2006
Keyword
Nitric acid, deposition velocity, mass transport, air velocity, relative humidity
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-4194 (URN)91-7178-483-7 (ISBN)
Public defence
2006-12-08, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Available from: 2006-11-29 Created: 2006-11-29 Last updated: 2016-12-21

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Authority records BETA

Leygraf, Christofer

Search in DiVA

By author/editor
Samie, FaridTidblad, JohanLeygraf, Christofer
By organisation
Corrosion Science
In the same journal
Journal of the Electrochemical Society
Chemical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 85 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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