Conduction mechanism in passive films on austenitic stainless steels in sulphate solutions
The passive state of three commercial highly alloyed austenitic stainless steels is studied by voltammetric, contact electric resistance and impedance measurements in 0.5 M sulphate solutions (pH 2-7). The three materials self-passivate and are susceptible to transpassive dissolution. The electric p...
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| Format: | Article |
| Language: | English |
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International Association of Physical Chemists (IAPC)
2015-08-01
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| Series: | Journal of Electrochemical Science and Engineering |
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| Online Access: | http://pub.iapchem.org/ojs/index.php/JESE/article/view/153 |
| _version_ | 1818279984337256448 |
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| author | Iva Betova |
| author_facet | Iva Betova |
| author_sort | Iva Betova |
| collection | DOAJ |
| description | The passive state of three commercial highly alloyed austenitic stainless steels is studied by voltammetric, contact electric resistance and impedance measurements in 0.5 M sulphate solutions (pH 2-7). The three materials self-passivate and are susceptible to transpassive dissolution. The electric properties of the passive films formed are only slightly dependent on alloy composition. The impedance response can be interpreted as due to both the electronic properties of a thin semiconductor film of variable stoichiometry and the ionic defect migration through that film limiting the metal dissolution rate in the passive state. A range of kinetic, transport and structural parameters characterising the passive film and its interfaces with the underlying alloys and the electrolyte solution are determined by a quantitative comparison of the Mixed-Conduction Model to the experimental steady-state current and impedance data in a wide potential range. The relevance of the parameter values and the prospects of using the proposed approach to predict the steady-state metal dissolution rate and thus the general corrosion behaviour of stainless steels are discussed. |
| first_indexed | 2024-12-12T23:42:01Z |
| format | Article |
| id | doaj.art-941aed1dcafb45a2b8d22f68b6a08ab7 |
| institution | Directory Open Access Journal |
| issn | 1847-9286 |
| language | English |
| last_indexed | 2024-12-12T23:42:01Z |
| publishDate | 2015-08-01 |
| publisher | International Association of Physical Chemists (IAPC) |
| record_format | Article |
| series | Journal of Electrochemical Science and Engineering |
| spelling | doaj.art-941aed1dcafb45a2b8d22f68b6a08ab72022-12-22T00:07:05ZengInternational Association of Physical Chemists (IAPC)Journal of Electrochemical Science and Engineering1847-92862015-08-015210.5599/jese.153132Conduction mechanism in passive films on austenitic stainless steels in sulphate solutionsIva Betova0Department of Chemistry, Technical University of SofiaThe passive state of three commercial highly alloyed austenitic stainless steels is studied by voltammetric, contact electric resistance and impedance measurements in 0.5 M sulphate solutions (pH 2-7). The three materials self-passivate and are susceptible to transpassive dissolution. The electric properties of the passive films formed are only slightly dependent on alloy composition. The impedance response can be interpreted as due to both the electronic properties of a thin semiconductor film of variable stoichiometry and the ionic defect migration through that film limiting the metal dissolution rate in the passive state. A range of kinetic, transport and structural parameters characterising the passive film and its interfaces with the underlying alloys and the electrolyte solution are determined by a quantitative comparison of the Mixed-Conduction Model to the experimental steady-state current and impedance data in a wide potential range. The relevance of the parameter values and the prospects of using the proposed approach to predict the steady-state metal dissolution rate and thus the general corrosion behaviour of stainless steels are discussed.http://pub.iapchem.org/ojs/index.php/JESE/article/view/153stainless steelmetal dissolutionpassive filmelectrochemical impedance spectroscopykinetic model |
| spellingShingle | Iva Betova Conduction mechanism in passive films on austenitic stainless steels in sulphate solutions Journal of Electrochemical Science and Engineering stainless steel metal dissolution passive film electrochemical impedance spectroscopy kinetic model |
| title | Conduction mechanism in passive films on austenitic stainless steels in sulphate solutions |
| title_full | Conduction mechanism in passive films on austenitic stainless steels in sulphate solutions |
| title_fullStr | Conduction mechanism in passive films on austenitic stainless steels in sulphate solutions |
| title_full_unstemmed | Conduction mechanism in passive films on austenitic stainless steels in sulphate solutions |
| title_short | Conduction mechanism in passive films on austenitic stainless steels in sulphate solutions |
| title_sort | conduction mechanism in passive films on austenitic stainless steels in sulphate solutions |
| topic | stainless steel metal dissolution passive film electrochemical impedance spectroscopy kinetic model |
| url | http://pub.iapchem.org/ojs/index.php/JESE/article/view/153 |
| work_keys_str_mv | AT ivabetova conductionmechanisminpassivefilmsonausteniticstainlesssteelsinsulphatesolutions |