The influence of the polarization time on the passivation of iron in sulphuric acid |
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| Authors: | I.J. Krstulović B. Kulušić M. Karšulin |
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| Affiliation: | Institute for Protection of Materials against Sea Water Corrosion and Desalination, Yugoslav Academy of Sciences and Arts, Dubrovnik, Yugoslavia |
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| Abstract: | The aim of the investigations was to define the time necessary to completely cover an iron surface with a passivating solid layer of FeSO4.7H2O resp. with FeSO4.1H2O. This was determined by anodic passivation of Armco iron in a wide range of concentrations of sulphuric acid and also by varying the time of the polarization. A log/log relationship between the passivation time (t) and acid concentration (N) was found. This indicated that the film was formed from the nuclei of FeSO4 which precede the crystallization of the appropriate form of hydrated FeSO4. |
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