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A Comparative Study of the Initial Corrosion of KCl and PbCl2 on a Low-Alloyed Steel

Erik Larsson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Hans Gruber (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Kristina Hellström (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Torbjörn Jonsson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Jesper Liske (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Jan-Erik Svensson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi)
Oxidation of Metals (0030-770X). Vol. 87 (2017), 5-6, p. 779-787.
[Artikel, refereegranskad vetenskaplig]

Heat exchange surfaces in biomass- and waste-fired boilers are exposed to corrosive species due to the considerable amounts of alkali chlorides and PbCl2 which are released during combustion. The corrosivity of alkali chlorides toward superheater alloys exposed at high temperature has been studied extensively. However, at lower material temperatures, i.e., at waterwall conditions, considerably less research has been performed. In order to investigate the effect of small amounts of KCl and PbCl2 during the initial stages of the corrosion attack, a Fe–2.25Cr–1Mo steel was exposed for 24 h in an atmospheres consisting of O2 + H2O + N2 at 400 °C. Both KCl and PbCl2 resulted in an increased corrosion rate compared to the reference. The aim of the present paper is to investigate the influence of KCl and PbCl2 on the initial oxidation of a Fe–2.25Cr–1Mo steel. The work involves a detailed microstructural investigation as well as thermodynamic equilibrium calculations.

Nyckelord: KCl; Low-alloyed steel; PbCl2; Waste combustion; Waterwalls



Denna post skapades 2017-06-14. Senast ändrad 2017-06-20.
CPL Pubid: 249789

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Oorganisk miljökemi

Ämnesområden

Kemi

Chalmers infrastruktur