caa a22 4500 445844361 CHVBK 20180317145354.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s11085-011-9240-z doi (NATIONALLICENCE)springer-10.1007/s11085-011-9240-z The Effects of KCl, K2SO4 and K2CO3 on the High Temperature Corrosion of a 304-Type Austenitic Stainless Steel [Elektronische Daten] [Jesper Pettersson, Nicklas Folkeson, Lars-Gunnar Johansson, Jan-Erik Svensson] The oxidation of 304-type (Fe18Cr10Ni) austenitic stainless steel was investigated at 500 and 600°C in 5% O2+40% H2O. Prior to exposure the samples were sprayed with KCl, K2CO3 or K2SO4, the amount of salt corresponding to 1.35μmolK+/cm2. For reference, salt-free samples were exposed in 5% O2+40% H2O and in 5% O2 (N2 was used as carrier gas). The oxidized samples were analyzed with SEM/EDX, XRD, IC and FIB. KCl and K2CO3 strongly accelerate the corrosion of 304L while K2SO4 has little influence on the corrosion rate and on the morphology of the corroded surface. KCl and K2CO3 react with the chromium-rich oxide on the sample surface, forming K2CrO4. The resulting chromium depletion of the protective oxide causes rapid oxidation and the formation of a thick duplex scale consisting of an outer hematite layer and a inner layer made up of FeCrNi spinel-type oxide. The differences in the corrosivity of the three salts are directly connected to their ability to form chromate on the surface and, hence, to the relative stability of the corresponding leaving groups (HCl, CO2 and SO3). The Author(s), 2011 KCl induced corrosion nationallicence K2SO4 nationallicence Deposit nationallicence Waste nationallicence Biomass nationallicence 304L nationallicence Pettersson Jesper Department of Chemical and Biological Engineering, Energy and Materials, Chalmers University of Technology, 412 96, Göteborg, Sweden aut Folkeson Nicklas Department of Chemical and Biological Engineering, Energy and Materials, Chalmers University of Technology, 412 96, Göteborg, Sweden aut Johansson Lars-Gunnar Department of Chemical and Biological Engineering, Energy and Materials, Chalmers University of Technology, 412 96, Göteborg, Sweden aut Svensson Jan-Erik Department of Chemical and Biological Engineering, Energy and Materials, Chalmers University of Technology, 412 96, Göteborg, Sweden aut Oxidation of Metals Springer-Verlag 76/1-2(2011-08-01), 93-109 0030-770X 76:1-2<93 2011 76 11085 https://doi.org/10.1007/s11085-011-9240-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11085-011-9240-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pettersson Jesper Department of Chemical and Biological Engineering, Energy and Materials, Chalmers University of Technology, 412 96, Göteborg, Sweden aut NATIONALLICENCE 700 1- Folkeson Nicklas Department of Chemical and Biological Engineering, Energy and Materials, Chalmers University of Technology, 412 96, Göteborg, Sweden aut NATIONALLICENCE 700 1- Johansson Lars-Gunnar Department of Chemical and Biological Engineering, Energy and Materials, Chalmers University of Technology, 412 96, Göteborg, Sweden aut NATIONALLICENCE 700 1- Svensson Jan-Erik Department of Chemical and Biological Engineering, Energy and Materials, Chalmers University of Technology, 412 96, Göteborg, Sweden aut NATIONALLICENCE 773 0- Oxidation of Metals Springer-Verlag 76/1-2(2011-08-01), 93-109 0030-770X 76:1-2<93 2011 76 11085 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer