An Electrochemical Impedance Study of AISI 321 Stainless Steel in 0.5 M H2SO4 | Zendy

Arash Fattahalhosseini | Zendy; M. Mosavi | Zendy; Atefe Allahdadi | Zendy

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An Electrochemical Impedance Study of AISI 321 Stainless Steel in 0.5 M H₂SO₄

Author(s) -

Arash Fattahalhosseini,

M. Mosavi,

Atefe Allahdadi

Publication year - 2011

Publication title -

international journal of electrochemistry

Language(s) - English

Resource type - Journals

eISSN - 2090-3537

pISSN - 2090-3529

DOI - 10.4061/2011/505929

Subject(s) - dielectric spectroscopy , materials science , electrical impedance , corrosion , polarization (electrochemistry) , equivalent circuit , electrochemistry , composite material , metallurgy , electrical engineering , electrode , chemistry , voltage , engineering

The electrochemical behavior of passive films formed on AISI 321 has been examined using electrochemical impedance spectroscopy. AISI 321 is characterized by high interfacial impedance, thereby illustrating its high corrosion resistance. Results showed that the interfacial impedance and the polarization resistance initially increase with applied potential, within the low potential. However, at a sufficiently high potential (>0.6 V), the interfacial impedance and the polarization resistance decrease with increasing potential. The impedance data were adequately represented by an equivalent electrical circuit model based on point defect model, which described the behavior of the passive film on stainless steel more satisfactorily than the proposed models

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