Corrosion Behavior of Al Modified with Zn in Chloride Solution
Aluminum-based alloys have been considered candidate materials for cathodic protection anodes. However, the Al-based alloys can form a layer of alumina, which is a drawback in a sacrificial anode. The anodes must exhibit uniform corrosion to achieve better performance. Aluminum can be alloyed with Z...
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MDPI AG
2022-06-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/12/4229 |
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| author | Jesús Porcayo Calderón José Luis Reyes Barragán Jesús Israel Barraza Fierro Héctor Cruz Mejía Cinthya Dinorah Arrieta González Víctor Ravelero Vázquez Kevin Piedad Sánchez María Teresa Torres-Mancera Rogel Fernando Retes-Mantilla Roberto Ademar Rodríguez-Díaz |
| author_facet | Jesús Porcayo Calderón José Luis Reyes Barragán Jesús Israel Barraza Fierro Héctor Cruz Mejía Cinthya Dinorah Arrieta González Víctor Ravelero Vázquez Kevin Piedad Sánchez María Teresa Torres-Mancera Rogel Fernando Retes-Mantilla Roberto Ademar Rodríguez-Díaz |
| author_sort | Jesús Porcayo Calderón |
| collection | DOAJ |
| description | Aluminum-based alloys have been considered candidate materials for cathodic protection anodes. However, the Al-based alloys can form a layer of alumina, which is a drawback in a sacrificial anode. The anodes must exhibit uniform corrosion to achieve better performance. Aluminum can be alloyed with Zn to improve their performance. In this sense, in the present research, the electrochemical corrosion performance of Al-xZn alloys (x = 1.5, 3.5, and 5 at.% Zn) exposed to 3.5 wt.% NaCl for 24 h was evaluated. Polarization curves, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) were used to identify the electrochemical behavior. The microstructure of the samples before the corrosion assessment was characterized by means of X-ray diffraction analyses (XRD) and scanning electron microscopy (SEM). In addition, microstructures of the corroded surfaces were characterized using X-ray mappings via SEM. Polarization curves indicated that Zn additions changed the pseudo-passivation behavior from what pure Al exhibited in a uniform dissolution regime. Furthermore, the addition of Zn shifted the corrosion potential to the active side and increased the corrosion rate. This behavior was consistent with the proportional decrease in polarization resistance (R<sub>p</sub>) and charge transfer resistance (<i>R<sub>ct</sub></i>) in the EIS. The analysis of EIS was done using a mathematical model related to an adsorption electrochemical mechanism. The adsorption of chloride at the Al-Zn alloy surface formed aluminum chloride intermediates, which controlled the rate of the process. The rate constants of the reactions of a proposed chemical mechanism were evaluated. |
| first_indexed | 2024-03-09T23:10:38Z |
| format | Article |
| id | doaj.art-53d9820ece984f7cbbcffc03973ab2c7 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T23:10:38Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-53d9820ece984f7cbbcffc03973ab2c72023-11-23T17:44:53ZengMDPI AGMaterials1996-19442022-06-011512422910.3390/ma15124229Corrosion Behavior of Al Modified with Zn in Chloride SolutionJesús Porcayo Calderón0José Luis Reyes Barragán1Jesús Israel Barraza Fierro2Héctor Cruz Mejía3Cinthya Dinorah Arrieta González4Víctor Ravelero Vázquez5Kevin Piedad Sánchez6María Teresa Torres-Mancera7Rogel Fernando Retes-Mantilla8Roberto Ademar Rodríguez-Díaz9Departamento de Ingeniería Química y Metalurgia, Universidad de Sonora, Hermosillo 83000, MexicoDepartamento de Ingeniería en Diseño, Universidad Politécnica de la Zona Metropolitana de Guadalajara, Tlajomulco de Zúñiga 45640, MexicoEscuela de Preparatoria, Universidad La Salle Nezahualcóyotl, Nezahualcóyotl 57300, MexicoDivisión de Ingeniería en Nanotecnología, Universidad Politécnica del Valle de México, Av. Mexiquense s/n, esq., Av. Universidad Politécnica, Villa Esmeralda, Fuentes del Valle 54910, MexicoTecnológico Nacional de México—Instituto Tecnológico de Zacatepec, Calzada Instituto Tecnológico 27, Zacatepec 62780, MexicoDepartamento de Ingeniería en Diseño, Universidad Politécnica de la Zona Metropolitana de Guadalajara, Tlajomulco de Zúñiga 45640, MexicoDepartamento de Ingeniería Química, Tecnológico de Estudios Superiores de Coacalco, Av. 16 de Septiembre 54, Coacalco 55700, MexicoDepartamento de Ingeniería Química y Ambiental, Tecnológico de Estudios Superiores de Coacalco, Av. 16 de Septiembre 54, Coacalco 55700, MexicoDepartamento de Posgrado en Logística y Cadena de Suministro, Tecnológico de Estudios Superiores de Coacalco, Av. 16 de Septiembre 54, Coacalco 55700, MexicoDepartamento de Ingeniería de Materiales, Tecnológico de Estudios Superiores de Coacalco, Av. 16 de Septiembre 54, Coacalco 55700, MexicoAluminum-based alloys have been considered candidate materials for cathodic protection anodes. However, the Al-based alloys can form a layer of alumina, which is a drawback in a sacrificial anode. The anodes must exhibit uniform corrosion to achieve better performance. Aluminum can be alloyed with Zn to improve their performance. In this sense, in the present research, the electrochemical corrosion performance of Al-xZn alloys (x = 1.5, 3.5, and 5 at.% Zn) exposed to 3.5 wt.% NaCl for 24 h was evaluated. Polarization curves, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) were used to identify the electrochemical behavior. The microstructure of the samples before the corrosion assessment was characterized by means of X-ray diffraction analyses (XRD) and scanning electron microscopy (SEM). In addition, microstructures of the corroded surfaces were characterized using X-ray mappings via SEM. Polarization curves indicated that Zn additions changed the pseudo-passivation behavior from what pure Al exhibited in a uniform dissolution regime. Furthermore, the addition of Zn shifted the corrosion potential to the active side and increased the corrosion rate. This behavior was consistent with the proportional decrease in polarization resistance (R<sub>p</sub>) and charge transfer resistance (<i>R<sub>ct</sub></i>) in the EIS. The analysis of EIS was done using a mathematical model related to an adsorption electrochemical mechanism. The adsorption of chloride at the Al-Zn alloy surface formed aluminum chloride intermediates, which controlled the rate of the process. The rate constants of the reactions of a proposed chemical mechanism were evaluated.https://www.mdpi.com/1996-1944/15/12/4229Al alloyAl-Zn alloycorrosionelectrochemical techniques |
| spellingShingle | Jesús Porcayo Calderón José Luis Reyes Barragán Jesús Israel Barraza Fierro Héctor Cruz Mejía Cinthya Dinorah Arrieta González Víctor Ravelero Vázquez Kevin Piedad Sánchez María Teresa Torres-Mancera Rogel Fernando Retes-Mantilla Roberto Ademar Rodríguez-Díaz Corrosion Behavior of Al Modified with Zn in Chloride Solution Materials Al alloy Al-Zn alloy corrosion electrochemical techniques |
| title | Corrosion Behavior of Al Modified with Zn in Chloride Solution |
| title_full | Corrosion Behavior of Al Modified with Zn in Chloride Solution |
| title_fullStr | Corrosion Behavior of Al Modified with Zn in Chloride Solution |
| title_full_unstemmed | Corrosion Behavior of Al Modified with Zn in Chloride Solution |
| title_short | Corrosion Behavior of Al Modified with Zn in Chloride Solution |
| title_sort | corrosion behavior of al modified with zn in chloride solution |
| topic | Al alloy Al-Zn alloy corrosion electrochemical techniques |
| url | https://www.mdpi.com/1996-1944/15/12/4229 |
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