On-line high temperature electrophoresis technique for evaluating stress corrosion cracking risk of stainless steels in cooking process

Heikki Leinonen, Heli Sirén, Pertti Vastamäki, Stella Rovio, Seppo Peltonen, Teemu Työppönen, Jaakko Rämö

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

On-line high temperature capillary electrophoresis instrument (HotUCE) was constructed for analysis of corrosive ions at normal pulping process temperatures in synthetic liquors in order to evaluate stress corrosion cracking (SCC) susceptibility of stainless steels. The HotUCE-instrument was on-line coupled to an autoclave, where welded duplex stainless steel samples were immersed 500 h in the simulated high ionic strength hot black, hot white or green liquors at temperatures below 210°C. The results showed that only minor amounts of oxidized sulphur compounds emerged. Amounts of sulphur species correlate with the corrosion potential changes of the duplex stainless steel specimens during the cooking experiments. The increase of sulphite during cooking was higher in hot white than in hot black liquor. The results indicate that SCC risk was enhanced at higher temperatures most probably due to increased formation of thiosulphate.
Original languageEnglish
Title of host publicationProceedings of a Corrosion Conference and Expo (CORROSION 2007)
Place of PublicationHouston, TX, USA
Number of pages16
Publication statusPublished - 2007
MoE publication typeA4 Article in a conference publication
EventCorrosion Conference and Expo 2007, Corrosion 2007 - Nashville, United States
Duration: 11 Mar 200715 Mar 2007

Conference

ConferenceCorrosion Conference and Expo 2007, Corrosion 2007
Abbreviated titleCorrosion 2007
CountryUnited States
CityNashville
Period11/03/0715/03/07

Keywords

  • electrophoresis
  • high temperature
  • on-line
  • stress corrosion cracking
  • stainless steels
  • welding
  • hot white liquor
  • hot black liquour
  • green liquor
  • pulp and paper industry

Fingerprint Dive into the research topics of 'On-line high temperature electrophoresis technique for evaluating stress corrosion cracking risk of stainless steels in cooking process'. Together they form a unique fingerprint.

  • Cite this

    Leinonen, H., Sirén, H., Vastamäki, P., Rovio, S., Peltonen, S., Työppönen, T., & Rämö, J. (2007). On-line high temperature electrophoresis technique for evaluating stress corrosion cracking risk of stainless steels in cooking process. In Proceedings of a Corrosion Conference and Expo (CORROSION 2007) [07213].