The Mechanism of Transpassive Dissolution of AISI 321 Stainless Steel in Sulphuric Acid Solution
The transpassive dissolution mechanism of AISI 321 stainless steel in a 0.5 M sulphate solution was studied using electrochemical impedance spectroscopy (EIS). On the basis of the experimental results, surface charge approach, and point defect model, a kinetic model of the transpassive dissolution p...
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| Format: | Article |
| Language: | English |
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Wiley
2011-01-01
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| Series: | International Journal of Electrochemistry |
| Online Access: | http://dx.doi.org/10.4061/2011/521384 |
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| author | A. Fattah-Alhosseini N. Attarzadeh |
| author_facet | A. Fattah-Alhosseini N. Attarzadeh |
| author_sort | A. Fattah-Alhosseini |
| collection | DOAJ |
| description | The transpassive dissolution mechanism of AISI 321 stainless steel in a 0.5 M sulphate solution was studied using electrochemical impedance spectroscopy (EIS). On the basis of the experimental results, surface charge approach, and point defect model, a kinetic model of the transpassive dissolution process is proposed. The transpassive film is modeled as a highly doped n-type semiconductor—insulator-p-type semiconductor structure. Injection of negative defects at the transpassive film/solution interface results in their accumulation as a negative surface charge. It alters the nonstationary transpassive film growth rate controlled by the transport of positive defects (oxygen vacancies). The model describes the process as dissolution of Cr as Cr (VI) and Fe as Fe (III) through the transpassive film via parallel reaction paths. |
| format | Article |
| id | doaj-art-326357d7593e4705a3b641df58386e31 |
| institution | Kabale University |
| issn | 2090-3537 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Electrochemistry |
| spelling | doaj-art-326357d7593e4705a3b641df58386e312025-02-03T01:03:20ZengWileyInternational Journal of Electrochemistry2090-35372011-01-01201110.4061/2011/521384521384The Mechanism of Transpassive Dissolution of AISI 321 Stainless Steel in Sulphuric Acid SolutionA. Fattah-Alhosseini0N. Attarzadeh1Faculty of Engineering, Bu-Ali Sina University (BASU), Hamedan 65178-38695, IranDepartment of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, IranThe transpassive dissolution mechanism of AISI 321 stainless steel in a 0.5 M sulphate solution was studied using electrochemical impedance spectroscopy (EIS). On the basis of the experimental results, surface charge approach, and point defect model, a kinetic model of the transpassive dissolution process is proposed. The transpassive film is modeled as a highly doped n-type semiconductor—insulator-p-type semiconductor structure. Injection of negative defects at the transpassive film/solution interface results in their accumulation as a negative surface charge. It alters the nonstationary transpassive film growth rate controlled by the transport of positive defects (oxygen vacancies). The model describes the process as dissolution of Cr as Cr (VI) and Fe as Fe (III) through the transpassive film via parallel reaction paths.http://dx.doi.org/10.4061/2011/521384 |
| spellingShingle | A. Fattah-Alhosseini N. Attarzadeh The Mechanism of Transpassive Dissolution of AISI 321 Stainless Steel in Sulphuric Acid Solution International Journal of Electrochemistry |
| title | The Mechanism of Transpassive Dissolution of AISI 321 Stainless Steel in Sulphuric Acid Solution |
| title_full | The Mechanism of Transpassive Dissolution of AISI 321 Stainless Steel in Sulphuric Acid Solution |
| title_fullStr | The Mechanism of Transpassive Dissolution of AISI 321 Stainless Steel in Sulphuric Acid Solution |
| title_full_unstemmed | The Mechanism of Transpassive Dissolution of AISI 321 Stainless Steel in Sulphuric Acid Solution |
| title_short | The Mechanism of Transpassive Dissolution of AISI 321 Stainless Steel in Sulphuric Acid Solution |
| title_sort | mechanism of transpassive dissolution of aisi 321 stainless steel in sulphuric acid solution |
| url | http://dx.doi.org/10.4061/2011/521384 |
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