High-Temperature Corrosion Behavior of Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub> Coating Prepared by rf Magnetron Sputtering
Using the rf magnetron sputtering technique, Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub> coatings were formed and obtained a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/10/1585 |
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| author | Jorge Bautista-Ruiz Jorge Sánchez-Molina Willian Aperador |
| author_facet | Jorge Bautista-Ruiz Jorge Sánchez-Molina Willian Aperador |
| author_sort | Jorge Bautista-Ruiz |
| collection | DOAJ |
| description | Using the rf magnetron sputtering technique, Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub> coatings were formed and obtained as a thin film on Hastelloy substrates. When subjected to high-temperature conditions, the effect of lanthanum on the anti-corrosive properties of the coatings was investigated. The anti-corrosive response was evaluated by electrochemical impedance spectroscopy and potentiodynamic curves, which are rarely reported. Hot corrosion occurs through the electrochemical mechanism, and more information can be obtained through electrochemical corrosion tests, which are very effective and fast. The electrochemical behavior at high temperatures was studied via molten salt corrosion tests, potentiodynamic polarization curves, and electrochemical impedance spectroscopy. Additionally, the coatings were evaluated via scanning electron microscopy and transmission microscopy to determine their morphology. With X-ray diffraction, the crystallinity of the films was determined. It was determined that the corrosion rate directly correlates with the temperature, attributed to the mechanisms induced by the Na<sub>2</sub>SO<sub>4</sub> and V<sub>2</sub>O<sub>5</sub> salts that generated condensation. As the temperature increases, the density of the corrosion current increases in the thin films of Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub>. When comparing the two compounds, it is determined that the increase in lanthanum alters the positive acid character, thus reducing the dissolution of the oxides and increasing protection. |
| first_indexed | 2024-03-09T19:48:08Z |
| format | Article |
| id | doaj.art-39dabd95bbed410eabab362eb66ddde2 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T19:48:08Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-39dabd95bbed410eabab362eb66ddde22023-11-24T01:17:23ZengMDPI AGMetals2075-47012022-09-011210158510.3390/met12101585High-Temperature Corrosion Behavior of Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub> Coating Prepared by rf Magnetron SputteringJorge Bautista-Ruiz0Jorge Sánchez-Molina1Willian Aperador2Centro de Investigación de Materiales Cerámicos, Universidad Francisco de Paula Santander, San Jose de Cucuta 540003, ColombiaCentro de Investigación de Materiales Cerámicos, Universidad Francisco de Paula Santander, San Jose de Cucuta 540003, ColombiaDepartment of Engineering, Universidad Militar Nueva Granada, Bogota 110111, ColombiaUsing the rf magnetron sputtering technique, Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub> coatings were formed and obtained as a thin film on Hastelloy substrates. When subjected to high-temperature conditions, the effect of lanthanum on the anti-corrosive properties of the coatings was investigated. The anti-corrosive response was evaluated by electrochemical impedance spectroscopy and potentiodynamic curves, which are rarely reported. Hot corrosion occurs through the electrochemical mechanism, and more information can be obtained through electrochemical corrosion tests, which are very effective and fast. The electrochemical behavior at high temperatures was studied via molten salt corrosion tests, potentiodynamic polarization curves, and electrochemical impedance spectroscopy. Additionally, the coatings were evaluated via scanning electron microscopy and transmission microscopy to determine their morphology. With X-ray diffraction, the crystallinity of the films was determined. It was determined that the corrosion rate directly correlates with the temperature, attributed to the mechanisms induced by the Na<sub>2</sub>SO<sub>4</sub> and V<sub>2</sub>O<sub>5</sub> salts that generated condensation. As the temperature increases, the density of the corrosion current increases in the thin films of Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub>. When comparing the two compounds, it is determined that the increase in lanthanum alters the positive acid character, thus reducing the dissolution of the oxides and increasing protection.https://www.mdpi.com/2075-4701/12/10/1585hot corrosionlanthanum dopedaccelerated oxidation |
| spellingShingle | Jorge Bautista-Ruiz Jorge Sánchez-Molina Willian Aperador High-Temperature Corrosion Behavior of Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub> Coating Prepared by rf Magnetron Sputtering Metals hot corrosion lanthanum doped accelerated oxidation |
| title | High-Temperature Corrosion Behavior of Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub> Coating Prepared by rf Magnetron Sputtering |
| title_full | High-Temperature Corrosion Behavior of Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub> Coating Prepared by rf Magnetron Sputtering |
| title_fullStr | High-Temperature Corrosion Behavior of Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub> Coating Prepared by rf Magnetron Sputtering |
| title_full_unstemmed | High-Temperature Corrosion Behavior of Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub> Coating Prepared by rf Magnetron Sputtering |
| title_short | High-Temperature Corrosion Behavior of Bi<sub>3.75</sub>La<sub>0.25</sub>Ti<sub>3</sub>O<sub>12</sub> and Bi<sub>3</sub>La<sub>1</sub>Ti<sub>3</sub>O<sub>12</sub> Coating Prepared by rf Magnetron Sputtering |
| title_sort | high temperature corrosion behavior of bi sub 3 75 sub la sub 0 25 sub ti sub 3 sub o sub 12 sub and bi sub 3 sub la sub 1 sub ti sub 3 sub o sub 12 sub coating prepared by rf magnetron sputtering |
| topic | hot corrosion lanthanum doped accelerated oxidation |
| url | https://www.mdpi.com/2075-4701/12/10/1585 |
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