Paper Title:
Passive-Active Transition Behavior of 304 Stainless Steel
  Abstract

The passive-active transition behavior of a 304 stainless steel was investigated by observing the self-activation behavior and nano-scale galvanostatic cathodic reduction experiment. The self-activation time, τ0 was dependent remarkably on concentration of sulfuric acid. It was appeared that applied nano-scale cathodic current density dissolved the passive film on a 304 stainless steel surface and shortened the activation time in galvanostatic cathodic reduction experiments. The applied cathodic current density was proportional to the reciprocal of activation time. From this linear relationship, the rate of the self-activation process, i0 was obtained. The i0 increased with increasing H2SO4 concentration. And i0 also increased with increasing passivation potential and passivation time. The stability of passive film increased in accordance with increasing τ0 and decreasing i0. Therefore, it was concluded that the stability of passive film on austenitic stainless steel is evaluated by the kinetic parameters of the self-activation rate i0 and the self-activation time, τ0.

  Info
Periodical
Materials Science Forum (Volumes 544-545)
Edited by
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
Pages
423-426
DOI
10.4028/www.scientific.net/MSF.544-545.423
Citation
W. S. Hwang, J. J. Lee, W. S. Yang, S. C. Na, "Passive-Active Transition Behavior of 304 Stainless Steel", Materials Science Forum, Vols. 544-545, pp. 423-426, 2007
Online since
May 2007
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Price
$32.00
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