000			01968nab a2200205 4500
005			20260520000910.0
008			260224s2010 xxu
245	0	0	_aCorrosion behavior of ferritic and martensitic power plant steels under conditions of dual atmospheres
260			_a _b _cdic. 2010
270			_a10/12/2010 ; 10/12/2010
300			_a7 p. ; 126001
520			_aTranscripción 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.
581			_a12
773	0		_tCorrosion _g66
942			_cARTICULO
100	1		_aHuenert, D. _944001
100	1		_aSchulz, W. _944002
100	1		_aKranzmann, A. _944003
999			_c172312 _d172312