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Kim D, Kim K, Park J, Chung W, Shin BH. Microstructure and corrosion performance of high-entropy alloy and austenite and super duplex stainless steels in 3.5% NaCl solution. INT J ELECTROCHEM SC 2023. [DOI: 10.1016/j.ijoes.2023.100074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
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Miramontes JC, Gaona Tiburcio C, García Mata E, Esneider Alcála MÁ, Maldonado-Bandala E, Lara-Banda M, Nieves-Mendoza D, Olguín-Coca J, Zambrano-Robledo P, López-León LD, Almeraya Calderón F. Corrosion Resistance of Aluminum Alloy AA2024 with Hard Anodizing in Sulfuric Acid-Free Solution. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6401. [PMID: 36143713 PMCID: PMC9506083 DOI: 10.3390/ma15186401] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 09/07/2022] [Accepted: 09/08/2022] [Indexed: 06/16/2023]
Abstract
In the aeronautical industry, Al-Cu alloys are used as a structural material in the manufacturing of commercial aircraft due to their high mechanical properties and low density. One of the main issues with these Al-Cu alloy systems is their low corrosion resistance in aggressive substances; as a result, Al-Cu alloys are electrochemically treated by anodizing processes to increase their corrosion resistance. Hard anodizing realized on AA2024 was performed in citric and sulfuric acid solutions for 60 min with constant stirring using current densities 3 and 4.5 A/dm2. After anodizing, a 60 min sealing procedure in water at 95 °C was performed. Scanning electron microscopy (SEM) and Vickers microhardness (HV) measurements were used to characterize the microstructure and mechanical properties of the hard anodizing material. Electrochemical corrosion was carried out using cyclic potentiodynamic polarization curves (CPP) and electrochemical impedance spectroscopy (EIS) in a 3.5 wt. % NaCl solution. The results indicate that the corrosion resistance of Al-Cu alloys in citric acid solutions with a current density 4.5 A/dm2 was the best, with corrosion current densities of 2 × 10-8 and 2 × 10-9 A/cm2. Citric acid-anodized samples had a higher corrosion resistance than un-anodized materials, making citric acid a viable alternative for fabricating hard-anodized Al-Cu alloys.
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Affiliation(s)
- José Cabral Miramontes
- Universidad Autónoma de Nuevo León, FIME-Centro de Investigación e Innovación en Ingeniería Aeronáutica (CIIIA), Av. Universidad s/n, Ciudad Universitaria, San Nicolás de los Garza 66455, Mexico
| | - Citlalli Gaona Tiburcio
- Universidad Autónoma de Nuevo León, FIME-Centro de Investigación e Innovación en Ingeniería Aeronáutica (CIIIA), Av. Universidad s/n, Ciudad Universitaria, San Nicolás de los Garza 66455, Mexico
| | - Estefanía García Mata
- Universidad Autónoma de Nuevo León, FIME-Centro de Investigación e Innovación en Ingeniería Aeronáutica (CIIIA), Av. Universidad s/n, Ciudad Universitaria, San Nicolás de los Garza 66455, Mexico
| | - Miguel Ángel Esneider Alcála
- Centro de Investigación en Materiales Avanzados Subsede Monterrey (CIMAV), Alianza Norte 202, PIIT, Autopista Monterrey-Aeropuerto, Km 10, Apodaca, Nuevo León 66628, Mexico
| | | | - Maria Lara-Banda
- Universidad Autónoma de Nuevo León, FIME-Centro de Investigación e Innovación en Ingeniería Aeronáutica (CIIIA), Av. Universidad s/n, Ciudad Universitaria, San Nicolás de los Garza 66455, Mexico
| | | | - Javier Olguín-Coca
- Área Académica de Ingeniería y Arquitectura, Universidad Autónoma del Estado de Hidalgo, 42082 Carretera Pachuca-Tulancingo, Km 4.5, Hidalgo 42082, Mexico
| | - Patricia Zambrano-Robledo
- Universidad Autónoma de Nuevo León, FIME-Centro de Investigación e Innovación en Ingeniería Aeronáutica (CIIIA), Av. Universidad s/n, Ciudad Universitaria, San Nicolás de los Garza 66455, Mexico
| | - Luis Daimir López-León
- Área Académica de Ingeniería y Arquitectura, Universidad Autónoma del Estado de Hidalgo, 42082 Carretera Pachuca-Tulancingo, Km 4.5, Hidalgo 42082, Mexico
| | - Facundo Almeraya Calderón
- Universidad Autónoma de Nuevo León, FIME-Centro de Investigación e Innovación en Ingeniería Aeronáutica (CIIIA), Av. Universidad s/n, Ciudad Universitaria, San Nicolás de los Garza 66455, Mexico
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Corrosion Behavior of Passivated Martensitic and Semi-Austenitic Precipitation Hardening Stainless Steel. METALS 2022. [DOI: 10.3390/met12061033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
This research aimed to conduct a passive layer state study on martensitic and semi-austenitic precipitation hardening stainless steels (PHSS) passivated in citric acid and nitric acid baths at 49 and 70 °C for 50 and 75 min and subsequently exposed in 5 wt.% NaCl and 1 wt.% H2SO4 solutions. Corrosion behavior of the passivated material was observed by using potentiodynamic polarization (PP) according to the ASTM G5-11 standard. The microstructural analysis was performed by optical microscopy and scanning electron microscopy (SEM), while the passivated layer was characterized by X-ray photoelectron spectroscopy (XPS). The results indicated that the semi-austenitic-NA-50 min-70 °C sample showed the best corrosion resistance behavior in both solutions. The XPS characterization confirmed that the martensitic and semi-austenitic surface film presented a mixture of chemical compounds, such as Cr2O3 and Fe(OH)O, respectively.
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