000			02087nab a2200205 4500
005			20260520000842.0
008			260224s2009 xxu
245	0	0	_aHigh-Temperature corrosion of superheater tube materials exposed to Zinc salts
260			_a _b _cjul./ago. 2009
270			_a15/06/2010 ; 14/06/2010
300			_a6 p. ; 3469-3474
520			_aTranscripción del resumen del autor. It is of great importance nowadays to develop a deeper understanding of corrosion phenomena occurring in energy conversion processes in thermal power plant technology systems. The superheaters in biofuels and waste-firing boilers are often exposed to aggressive compounds, which strongly decrease their durability. Waste incinerators and demolition wood-fired boiler deposits usually contain relatively high concentrations of heavy metals, such as Zn and Pb compounds. These elements, in combination with chlorine, can decrease the first melting point of the deposits. Consequently, molten salt attack by these metal chlorides can occur, and the corrosion will be more severe than gas-phase corrosion. In this study, laboratory-scale, high-temperature corrosion tests have been carried out. Well-characterized salt mixtures consisting of zinc and potassium chlorides and sulfates (K2SO4, KCl, and ZnCl2) were used for corrosion testing. Tests were performed for three commercially used steam tube materials. The metal specimens covered with salts were exposed to temperatures ranging from 350 to 600 °C for 168 h. After heat treatment, the specimens were analyzed using a scanning electron microscope and energy-dispersive X-ray (SEM-EDX) to determine the oxide layer thickness and the elemental distribution in the oxide scale. The results showed enhanced corrosion of low alloy steel with an increasing temperature and increasing amount of ZnCl2 in the salt mixture.
581			_a4
773	0		_tEnergy & fuels _g23
942			_cARTICULO
100	1		_aBankiewicz, Dorota _942626
100	1		_aYrjas, Patrik _942627
100	1		_aHupa, Mikko _942611
999			_c170999 _d170999