01968nab a2200205 4500 20260520000910.0 260224s2010 xxu Corrosion behavior of ferritic and martensitic power plant steels under conditions of dual atmospheres dic. 2010 10/12/2010 ; 10/12/2010 7 p. ; 126001 Transcripción del resumen del autor. The most efficient construction materials for boiler water walls and superheaters in steam power plants are ferritic and martensitic steels. In practical operation, tubes are exposed simultaneously to combustion gas and air/steam on their opposite surfaces. The corrosion behavior of ferritic-martensitic steels under such dual atmospheres is nondistinctive and has been investigated in a specially designed test equipment between 500°C and 620°C. The power plant conditions were simulated with a flowing and pressurized (80 bar) combustion gas on the inner side of the tube, which contains water (H2O) and carbon dioxide (CO2). On the outer side, tube material was exposed to air. Oxides that formed on the air side under dual atmosphere conditions were significantly different from the oxide scales formed when the alloy was exposed to air only. It is assumed that the anomalous corrosion behavior during the dual atmosphere exposure is due to hydrogen and carbon diffusion through the bulk alloy from the combustion gas side to the air side. Both species are produced when the material reacts with the gas phase. Because of its high diffusivity, hydrogen is thought to affect the corrosion process on the air side from the beginning of the corrosion exposure, whereas carbon reaches the opposite side after a considerably longer time period. 12 Corrosion 66 ARTICULO Huenert, D. 44001 Schulz, W. 44002 Kranzmann, A. 44003 172312 172312 0 0 0 0 240131 BAAB BAAB 2026-03-05 200050288 0 200050288 2026-03-05 16:08:05 2026-03-05 ARTICULO