Corrosion Behavior of AA2055 Aluminum-Lithium Alloys Anodized in the Presence of Sulfuric Acid Solution
The aim of this work was to evaluate the corrosion behavior of the AA2055 Aluminum-lithium alloy anodized in a sulfuric acid (H<sub>2</sub>SO<sub>4</sub>) bath, varying the current density of 0.19 and 1 A·cm<sup>−2</sup> and why the sealing solution was water (H&l...
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| Autores principales: | , , , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/6e274bbe8ff845a98a077e5a1220194a |
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| Sumario: | The aim of this work was to evaluate the corrosion behavior of the AA2055 Aluminum-lithium alloy anodized in a sulfuric acid (H<sub>2</sub>SO<sub>4</sub>) bath, varying the current density of 0.19 and 1 A·cm<sup>−2</sup> and why the sealing solution was water (H<sub>2</sub>O) and sodium dichromate (Na<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub>). Anodized samples were exposed to a 10 vol.% H<sub>2</sub>SO<sub>4</sub> solution and the electrochemical technique used was electrochemical impedance spectroscopy. Scanning electron microscopy and X-ray photoelectron spectroscopy were employed to characterization of the anodizing layer, determinate morphology and thickness of coatings. The Na<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> sealing solution tends to increase the charge transfer resistance and produces a more homogeneous and compact passive oxide layer, and imparts a corrosion inhibition protection to the AA2055. SEM observations indicated that the morphology and thickness of the anodic films formed on AA2055 aluminum-lithium alloy anodized have the best results for both current densities. |
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