000			01637nab a2200205 4500
005			20260520000923.0
008			260224s2011 xxu
245	0	0	_aStress corrosion cracking of alloy 625 in ph2 aqueous solution at high temperature and pressure
260			_a _b _cmar. 2011
270			_a22/03/2011 ; 22/03/2011
300			_a7 p. ; 035002-1 a 035002-8
520			_aTranscripción del resumen del autor: Stress corrosion cracking (SCC) of Alloy 625 (UNS N06625) has been investigated in pH 2 aqueous solution at high temperatures (300°C to 426°C) and high pressure (24.1 MPa) to understand the corrosion behavior in supercritical water oxidation (SCWO) systems, which can destroy aqueous organic wastes with high efficiency with no harmful byproducts. Alloy 625 was exposed to 11 operational (chemical, thermal, pressure) cycles. SCC at subcritical temperature comes from the chemical stability of the elements, which produces a dealloyed oxide layer where Ni is selectively dissolved and Cr forms stable oxides. Its growth is accelerated along the grain boundaries, where SCC develops during the operational cycles. As a result of the defective dealloyed oxide layer structure, the diffusivity of Ni is fast, intermediate between the surface and grain boundary diffusivities. SCC at supercritical temperature comes from the direct chemical attack of associated hydrochloric acid (HCl) molecules.
581			_a3
773	0		_tCorrosion _g67
942			_cARTICULO
100	1		_aKim, H. _99787
100	1		_aMitton, D.B. _944819
100	1		_aLatanision, R.M. _940741
999			_c174131 _d174131