Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température
J. Phys. IV France 03 (1993) C9-771-C9-778
Coating behaviour for materials of industrial waste incinerators and heat exchangers in high temperature corrosive atmospheresF. Devisme1, T. Flament1, J.C. Mulet2, C. Prebende2 and J.L. Martigneaux3
1 CEA/DTA/CEREM/DTM/SCECF, Centre d'Etudes de Fontenay-aux-Roses, 60-68 Avenue du Général Leclerc, B.P. 6, 92265 Fontenay-aux-Roses Cedex, France
2 BERTIN et Cie, Centre de Bayonne, Zone Industrielle, 40220 Tarnos, France
3 GEREP S.A. Zone industrielle de Mitry-Compans, rue Jacquard, 77290 Mitry-Mory, France
A coating obtained by flame spraying (Ni-Al) and an aluminizing type (Sermaloy J) were tested in laboratory and in industrial waste incinerator (substrate : AISI 310S steel). In laboratory tests, the studied parameters were : HCl-content (1 and 3% vol. in air + 0.1% vol. SO2), temperature (600 and 800 °C) and thermal cycling between 800 and 400 °C. The increasing of the temperature and HCl-content, and also thermal cycling lead to a degradation of the non coated steel and Ni-Al coated specimen behaviours ; as for Sermaloy J, only temperature raising seems to have a detrimental effect (first batch). For the field tests, the specimens were exposed at about 600 °C in flue gases containing about 0.4% vol. HCl and flying ashes (sodium chloride and sulfate) ; the corrosion phenomena are more closed to molten salts interactions than to gaseous corrosion : Ni-Al behaves better compared with Sermaloy J and the non coated steel which are much more attacked than in laboratory. However, Sermaloy J and Ni-Al can lead to a real protection of a steel substrate but the manufacturing conditions have a great influence on the behaviour of the coated specimens.
© EDP Sciences 1993