Kinetics study of ozone gas enhanced passivation of pure iron

H. Nanjo, Y. Suzuki, J. Hayasaka, F. M.B. Hassan, I. Ishikawa, M. Kanakubo, T. Aizawa, T. Aida, J. Onagawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Active Members of Electrochemical Society Passive film was exposed by ozone gas to study the applicability of improving the surface structure such as atomically flat terrace. Because water and/or other minor species were contained in the passive oxide film, it is expected that ozone gas oxidized some of them and help the reconstruction of passive film toward stable crystal phase of oxides. The oxide film thickness increased much faster in ozone gas than in air due to ozone oxidation. The thickness increased remarkably by passivation at 800 mV (Ag/AgCl), but increased slightly in ozone gas and decreased in air due to reconstruction after rapid growth of oxides by the passivation at 800 mV. The thickness decreased by passivation at -350 mV, but increased apparently by ozone exposure. The widest terrace width was obtained by passivation at 800 mV and the subsequent ozone gas exposure. The value was three times larger than that of air-formed oxide film. The terrace width with atomic scale flatness correlated with the corrosion resistance except for the increase in oxides film thickness.

Original languageEnglish
Title of host publicationECS Transactions - Nanotechnology - General - 214th ECS Meeting/PRiME 2008
Number of pages9
Publication statusPublished - 2009
Externally publishedYes
EventNanotechnology - General - 214th ECS Meeting/PRiME 2008 - Honolulu, HI, United States
Duration: Oct 12 2008Oct 17 2008

Publication series

NameECS Transactions
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737


ConferenceNanotechnology - General - 214th ECS Meeting/PRiME 2008
Country/TerritoryUnited States
CityHonolulu, HI

ASJC Scopus subject areas

  • General Engineering


Dive into the research topics of 'Kinetics study of ozone gas enhanced passivation of pure iron'. Together they form a unique fingerprint.

Cite this