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| FORMATION OF PASSIVE FILM ON 304 STAINLESS STEEL UNDER ALTERNATING VOLTAGE ELECTRIC FIELD |
| ZHANG Junxi; YAN Licheng; WEI Zengfu; QIAO Yinan; CAO Chunan |
| Electrochemical Research Group; Shanghai University of Electric Power; Key Laboratory of State Power Corporation of China; Shanghai 200090 |
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Cite this article:
ZHANG Junxi; YAN Licheng; WEI Zengfu; QIAO Yinan; CAO Chunan. FORMATION OF PASSIVE FILM ON 304 STAINLESS STEEL UNDER ALTERNATING VOLTAGE ELECTRIC FIELD. Acta Metall Sin, 2004, 40(4): 404-410 .
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Abstract An investigation on the growth of passive film on 304 stainless steel
by using alternating voltage (A.V.) passivation was carried out by
electrochemical impedance spectroscopy (EIS), coulometry measurement
and atomic force microscopy (AFM). EIS was performed on 304 stainless
steel electrode, which is covered by A.V. passive film, to identify the
formation of pore as a function of higher potential parts ($E_{\rm h}$)
in alternating square wave electric field. Coulomb--time curves were
measured during the growth of passive film on different conditions. A
new concept, probability of pore formation, which describes the behavior
of the pores during the growth of film, was presented. Results indicate
that the growth mechanism of A.V. passive film is different from that of
D.C. passive film, which makes the A.V. passive films have a faster
growth rate. Coulomb--time curves and AFM analysis confirmed the growth
mechanism of A.V. passive film.
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Received: 08 May 2003
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