Air Quality Simulation and Assessment (Aqsa) Model

Tsai, Ching-Fen; Lin, Hong‐Zong

doi:10.4271/2003-01-2438

Cited by 1 publication

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“…These results mean that austenite phase facilitates the dissolution of ferrite phase by galvanic coupling. By Tsai et al, 15) it is revealed that two separate peaks exist in anodic active-to-passive transition region of polarization curve of SAF2205 in H 2 SO 4 /HCl mixed solution. At higher anodic peak, the preferential dissolution of austenite phase occured, while the lower peak corresponded to the ferrite phase.…”

Section: Introductionmentioning

confidence: 98%

Selective Dissolution Characteristics of 26Cr-7Ni-2.5Mo-3W Duplex Stainless Steel in H2SO4/HCl Mixed Solution

et al. 2009

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Selective dissolution of hyper duplex stainless steel was studied by potentiodynamic and potentiostatic test in various concentrations of H 2 SO 4 /HCl solutions at various temperatures. There were two peaks in the active-to-passive transition region in potentiodynamic test in 2 M H 2 SO 4 + 0.5 M HCl solution at 60 C. In potentiostatic tests, the curve at À340 mV showed stable current density. As the potential increased, the current density increased and at above À310 mV potential, there was a much longer initial period of nonsteady current value. As the potential reached at À280 mV, the current density started to be stabilized and the current density was completely stabilized at À250 mV. It was found that a preferential dissolution of ferrite phase occurred at À330 mV and with the increase of potential, austenite phase was corroded at a high rate. On the other hand, both two phases were passivated at the potential above À270 mV, so that selective dissolution was absent.

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Section: Introductionmentioning

confidence: 98%