Journal
COATINGS
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/coatings11111278
Keywords
anodizing; aluminum-lithium 2055 alloy; corrosion; SEM; XPS; electrochemical impedance spectroscopy
Categories
Funding
- Mexican National Council for Science and Technology (CONACYT) [A1-S-8882]
- Universidad Autonoma de Nuevo Leon (UANL)
- [UANL-CA-316]
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The study aimed to evaluate the corrosion behavior of the AA2055 Aluminum-lithium alloy anodized in a sulfuric acid bath with different current densities and sealing solutions. It was found that the sodium dichromate sealing solution produced a more homogeneous and compact passive oxide layer, enhancing the corrosion inhibition protection of the AA2055. SEM observations showed that the anodic films formed on the alloy had the best results for both current densities.
The aim of this work was to evaluate the corrosion behavior of the AA2055 Aluminum-lithium alloy anodized in a sulfuric acid (H2SO4) bath, varying the current density of 0.19 and 1 A & BULL;cm(-2) and why the sealing solution was water (H2O) and sodium dichromate (Na2Cr2O7). Anodized samples were exposed to a 10 vol.% H2SO4 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 Na2Cr2O7 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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