000			01919nab a2200205 4500
005			20260520000935.0
008			260224s2010 xxu
245	0	0	_aInfluence of nitrate on pit stability in austenitic stainless steel
260			_a _b _cjul. 2010
270			_a02/08/2010 ; 02/08/2010
300			_a12 p. ; 075004
520			_aTranscripción del resumen del autor. Sufficiently high concentrations of nitrate (NO3-) additions to chloride (Cl-) solution resulted in the elimination of slow rise metastable pitting transients and, correspondingly, localized corrosion inhibition in Type 304L (UNS S30403) stainless steel (SS). In comparison, the nucleation frequency of sharp rise metastable pitting transients was independent of NO3- concentration. Sharp rise transients in solutions containing only NO3- were associated with the highest peak current and calculated pit current densities, 50 A/cm2 to 200 A/cm2. Thus, NO3- does not appear to inhibit pitting corrosion by reducing the current density at the incipient pit surface. To evaluate the influence of NO3- on repassivation, we developed a mathematical expression for fitting transients. In the case of sharp rise transients, the resulting parameters were used to generate plots of the anodic dissolution and the film growth components of the current as well as the fraction of passive film coverage with time. In comparison, the decay portion of slow rise transients could not befit by our expression. It was concluded that, while the repassivation of sharp rise transients can be modeled as exposure of bare metal and subsequent oxide film formation, it appears that the repassivation of slow transients is governed by a different process.
581			_a7
773	0		_tCorrosion _g66
942			_cARTICULO
100	1		_aLillard, R.S. _927365
100	1		_aVasquez, G. _946106
100	1		_aBahr, D.F. _946107
999			_c175610 _d175610