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The influence of small amounts of KCl(s) on the high temperature corrosion of a Fe-2.25Cr-1Mo steel at 400 and 500 degrees C

Nicklas Folkeson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Torbjörn Jonsson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Mats Halvarsson (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; Lars-Gunnar Johansson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Jan-Erik Svensson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
Materials and Corrosion-Werkstoffe Und Korrosion (0947-5117). Vol. 62 (2011), 7, p. 606-615.
[Artikel, refereegranskad vetenskaplig]

This paper reports the oxidation behaviour of a low-alloyed steel (Fe-2.25Cr-1Mo) in the presence of small amounts of KCl(s) at 400 and 500 degrees C. Cleaned and polished sample coupons were exposed in a horizontal tube furnace with exposure times ranging from one hour to one week. The flue gas composition was 5% O(2) with 40% H(2)O in N(2), and 0.1mg KCl/cm(2) was deposited on the samples prior to exposure. X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis were used to characterize the samples. Cross sections were prepared by means of focused ion beam (FIB) and broad ion beam (BIB). At 400 degrees C there was a modest mass gain in the absence of KCl. In the presence of KCl, mass gain is significantly increased and a rapid attack is evident already after short exposure times. At 500 degrees C, the mass gains in the absence of KCl were considerably higher than at 400 degrees C, especially after 168 hours of exposure. KCl had an effect at shorter exposure times, but after one week the samples exposed with and without KCl had mass gains of comparable magnitude.

Nyckelord: simulated combustion atmospheres, alloy sanicro 28, fe-cr alloys, boiler, steels, oxidizing atmospheres, iron oxidation, pure fe, behavior, 600-degrees-c, diffusion, nallan mj, 1983, p316



Denna post skapades 2011-09-15. Senast ändrad 2017-10-03.
CPL Pubid: 146228

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)
Institutionen för teknisk fysik, Mikroskopi och mikroanalys (2005-2012)

Ämnesområden

Kemi

Chalmers infrastruktur