Pitting corrosion of 304 stainless steel in secondary water supply system
The effect of NaClO solution on pitting behavior of 304 stainless steel was investigated by electrochemical tests and composition analysis. The results show that the open circuit potential (OCP) shifts to the positive direction with the increase of [ClO−], indicating that the passivation film formed...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Corrosion Communications |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667266922000457 |
| _version_ | 1811316798531829760 |
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| author | Kuijiao Li Li Sun Wenkai Cao Si Chen Zhiwei Chen Yanli Wang Weihua Li |
| author_facet | Kuijiao Li Li Sun Wenkai Cao Si Chen Zhiwei Chen Yanli Wang Weihua Li |
| author_sort | Kuijiao Li |
| collection | DOAJ |
| description | The effect of NaClO solution on pitting behavior of 304 stainless steel was investigated by electrochemical tests and composition analysis. The results show that the open circuit potential (OCP) shifts to the positive direction with the increase of [ClO−], indicating that the passivation film formed on the sample surface is faster, but, has no effect on pitting potential (Eb) in the first stage (< 24 h). After 24 h immersion, the pitting occurs because Cl− is detected in the wake of the decomposition of ClO− for its thermodynamics instability. In the later stage, the [Cl−] increases with the increase of [ClO−], correspondingly resulting in lower pitting resistance. X-ray photoelectron spectroscopy (XPS) reveals that the Cr/Fe atomic ratio in the passivation film decreases with the increase of [ClO−], because Cr(III) is oxidized to Cr(VI) and dissolves in the solution, which further weakens the pitting resistance of 304 stainless steel. The electrochemical impedance spectroscopy (EIS), combined with the Mott-Schottky analysis (MSA) was employed to verify the properties of the passivation film related to pitting. |
| first_indexed | 2024-04-13T11:55:44Z |
| format | Article |
| id | doaj.art-4e7251ac6153405cabc192140e373498 |
| institution | Directory Open Access Journal |
| issn | 2667-2669 |
| language | English |
| last_indexed | 2024-04-13T11:55:44Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Corrosion Communications |
| spelling | doaj.art-4e7251ac6153405cabc192140e3734982022-12-22T02:47:55ZengElsevierCorrosion Communications2667-26692022-09-0174350Pitting corrosion of 304 stainless steel in secondary water supply systemKuijiao Li0Li Sun1Wenkai Cao2Si Chen3Zhiwei Chen4Yanli Wang5Weihua Li6School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, ChinaSchool of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China; Corresponding authors.School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, ChinaSchool of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, ChinaSchool of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, ChinaSchool of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, ChinaSchool of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China; Corresponding authors.The effect of NaClO solution on pitting behavior of 304 stainless steel was investigated by electrochemical tests and composition analysis. The results show that the open circuit potential (OCP) shifts to the positive direction with the increase of [ClO−], indicating that the passivation film formed on the sample surface is faster, but, has no effect on pitting potential (Eb) in the first stage (< 24 h). After 24 h immersion, the pitting occurs because Cl− is detected in the wake of the decomposition of ClO− for its thermodynamics instability. In the later stage, the [Cl−] increases with the increase of [ClO−], correspondingly resulting in lower pitting resistance. X-ray photoelectron spectroscopy (XPS) reveals that the Cr/Fe atomic ratio in the passivation film decreases with the increase of [ClO−], because Cr(III) is oxidized to Cr(VI) and dissolves in the solution, which further weakens the pitting resistance of 304 stainless steel. The electrochemical impedance spectroscopy (EIS), combined with the Mott-Schottky analysis (MSA) was employed to verify the properties of the passivation film related to pitting.http://www.sciencedirect.com/science/article/pii/S2667266922000457Pitting corrosion304 Stainless steelElectrochemistryPassive film |
| spellingShingle | Kuijiao Li Li Sun Wenkai Cao Si Chen Zhiwei Chen Yanli Wang Weihua Li Pitting corrosion of 304 stainless steel in secondary water supply system Corrosion Communications Pitting corrosion 304 Stainless steel Electrochemistry Passive film |
| title | Pitting corrosion of 304 stainless steel in secondary water supply system |
| title_full | Pitting corrosion of 304 stainless steel in secondary water supply system |
| title_fullStr | Pitting corrosion of 304 stainless steel in secondary water supply system |
| title_full_unstemmed | Pitting corrosion of 304 stainless steel in secondary water supply system |
| title_short | Pitting corrosion of 304 stainless steel in secondary water supply system |
| title_sort | pitting corrosion of 304 stainless steel in secondary water supply system |
| topic | Pitting corrosion 304 Stainless steel Electrochemistry Passive film |
| url | http://www.sciencedirect.com/science/article/pii/S2667266922000457 |
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