Impact of Deposits and Their Morphology on the Active Corrosion of Iron in Chlorine- and Sulfur-Containing Atmospheres in the Temperature Range of 350–500 °C
- 6 Downloads
Iron-based alloys have shown high corrosion rates under ash deposits typical for waste-to-energy plants. The ashes on superheater tubes in waste incineration are multicomponent systems including alkali and alkali–earth chlorides and sulfates. Under and within such salts, the corrosive effect on the alloy is induced by a complicated interplay of such ash products. On the one hand, in chlorine-containing atmospheres iron-based alloys are believed to be attacked by the so-called active corrosion, including the formation of volatile corrosion products and their transformation into stable iron oxides. At the same time, they form complex scales, involving among other compounds iron sulfides, chlorides, and oxides. Thus, in order to directly investigate the influence of a deposit on the corrosion in waste-to-energy plants and to reproduce the scales observed on field tested superheaters, this work compares the scale formation and metal wastage under different chemically inert alumina deposits with different grain sizes to a synthetic salt as well as to an actual deposit taken from a superheater tube in a plant.
KeywordsChlorine corrosion Carbon steel Waste incineration High temperature Deposits
Thanks are expressed to the Federal Ministry of Education and Research Germany (BMBF) for financing this work and to Ragnar Warnecke from GKS Schweinfurt for providing the plant ash.
- 1.Eurostat, Environmental statistics and accounts in Europe, http://ec.europa.eu/eurostat/de/web/products-statistical-books/-/KS-32-10-283 (2010).
- 2.S. Pollmann, Chemie Ingenieur Technik 39 (1967).Google Scholar
- 3.P. L. Daniel, L. D. Paul and J. Barna, Materials Performance 27, 1988 (22).Google Scholar
- 9.K. Kautz and J. Tichatschke, VGB Kraftwerkstechnik 52, 1972 (249).Google Scholar
- 10.D. Kopeliovich, Fluxes for melting aluminum, www.substech.com/dokuwiki/doku.php?id=fluxes_for_melting_aluminum (2012).
- 13.M.J. McNallan, W.W. Liang, S.H. Kim, and C.T. Kang, in Proceedings of High Temperature Corrosion, San Diego California, 2–6 March 1981, ed. by R.A. Rapp, NACE, 1983), p. 316.Google Scholar
- 21.K. Rahts, M. Schorr, C. Schwalm and M. Schütze, Praktische Metallographie 36, 1999 (86).Google Scholar
- 22.NACE International, Preparation, Installation, Analysis, and Interpretation of Corrosion Coupons in Oilfield Operations (2005).Google Scholar
- 24.B. Waldmann, Dr. rer. nat. Thesis, Universität Augsburg, 2007.Google Scholar
- 25.Z. Grzesik and S. Mrowec, High Temperature Materials and Processes 31, 2012 (539).Google Scholar
- 33.U. Hohmann, in Rauchgasseitige Dampferzeugerkorrosion: Erfahrungen bei der Schadensminderung, ed. by M. Born, Saxonia, (Freiberg, 2003), p. 79.Google Scholar