Corrosive environments in modern kraft batch cooking

Heikki Leinonen, Petri Lassila

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

Abstract

Corrosive environments have been studied in three modern Finnish kraft batch digesters during their normal operation. The potentials of a carbon steel, an austenitic stainless steel and a duplex stainless steel have been measured for a long period of time using an on-line digester process and corrosion monitoring system. Corrosion potentials of the steels varied extensively depending on the stages of the batch process and on the cooking processes. The lowest potentials were in stable stage of cooking, where temperature was over 150°C and hot white liquor has been added. The differences of corrosion potentials in different cooking processes has been analysed with the operating process parameters such as temperature and composition of green, impregnation, hot black, hot white, split white and displacement liquors. Linear polarisation resistances of the studied steels showed good correlation of the weight losses of the steels. The highest resistances were monitored during filling and impregnation stages and the lowest in stable stage of cooking. The corrosion of the studied steels depends notably also on the operation sequences in batch digesting.
Original languageEnglish
Title of host publication10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI). Vol. 2
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages427-440
ISBN (Electronic)951-38-5724-7
ISBN (Print)951-38-5721-2
Publication statusPublished - 2001
MoE publication typeA4 Article in a conference publication
Event10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI - Helsinki, Finland
Duration: 21 Aug 200124 Aug 2001

Publication series

SeriesVTT Symposium
Number215
ISSN0357-9387

Conference

Conference10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI
Abbreviated title10th ISCPPI
CountryFinland
CityHelsinki
Period21/08/0124/08/01

Fingerprint

Cooking
Corrosion
Steel
Impregnation
Austenitic stainless steel
Carbon steel
Stainless steel
Polarization
Temperature
Monitoring
Chemical analysis

Cite this

Leinonen, H., & Lassila, P. (2001). Corrosive environments in modern kraft batch cooking. In 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI). Vol. 2 (pp. 427-440). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 215
Leinonen, Heikki ; Lassila, Petri. / Corrosive environments in modern kraft batch cooking. 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI). Vol. 2. Espoo : VTT Technical Research Centre of Finland, 2001. pp. 427-440 (VTT Symposium; No. 215).
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Leinonen, H & Lassila, P 2001, Corrosive environments in modern kraft batch cooking. in 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI). Vol. 2. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 215, pp. 427-440, 10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI , Helsinki, Finland, 21/08/01.

Corrosive environments in modern kraft batch cooking. / Leinonen, Heikki; Lassila, Petri.

10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI). Vol. 2. Espoo : VTT Technical Research Centre of Finland, 2001. p. 427-440 (VTT Symposium; No. 215).

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

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Leinonen H, Lassila P. Corrosive environments in modern kraft batch cooking. In 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI). Vol. 2. Espoo: VTT Technical Research Centre of Finland. 2001. p. 427-440. (VTT Symposium; No. 215).