Efecto del tratamiento de sellado en el comportamiento frente a corrosión de la aleación anodizada de aluminio-litio AA2099

Published on Dec 14, 2020in Revista De Metalurgia0.959
· DOI :10.3989/REVMETALM.180
P. Samaniego-Gámez1
Estimated H-index: 1
(Universidad Autónoma de Nuevo León),
Facundo Almeraya-Calderón11
Estimated H-index: 11
+ 7 AuthorsDavid M. Bastidas22
Estimated H-index: 22
The corrosion behavior of the sulphuric-anodized AA2099 using two different current densities, 0.19 or 1.0 A·cm−2, with two different sealing treatments in H2O and 6 wt.% Na2Cr2O7 at 95 °C was studied in 3.5 wt.% NaCl and 10 vol.% H2SO4 solutions. The AA2099 is widely used in aeronautical applications, thus it is essential to present good corrosion performance in chloride and acid rain environments. The surface morphology of the anodized film was characterized by scanning electron microscopy (SEM), the electrochemical corrosion behavior was studied using electrochemical impedance (EIS), and finally characterization of the surface chemical composition was revealed by X-ray photoelectron spectroscopy (XPS). It was found the 6 wt.% Na2Cr2O7 sealing treatment imparts a more homogeneous and compact passive layer, and tends to increase the charge transfer resistance, thus improving the corrosion behavior of the anodized AA2099.
#1Shanwen Yu (HBUT: Hubei University of Technology)H-Index: 2
#2Lishi Wang (HBUT: Hubei University of Technology)H-Index: 2
Last. Shiqi Zhu (HBUT: Hubei University of Technology)H-Index: 1
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Abstract The anodic oxide coating was formed on 2024-T3 aluminium alloy with sulfuric-boric acid anodizing. Then it was sealed with an alkaline Mn–Mo oxyanions electrolyte. This investigation revealed the surface morphology of the Mn–Mo sealed sample which showed flake-like surface cluster structure. EDS analysis results of the coating cross-section verified the relative even distribution of the oxygen, aluminium species, but Mo element existed in the outer region of the anodic coating. XPS anal...
#1Fan Zhang (KTH: Royal Institute of Technology)H-Index: 26
#2Cem Örnek (KTH: Royal Institute of Technology)H-Index: 17
Last. Jinshan Pan (KTH: Royal Institute of Technology)H-Index: 45
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Abstract Microstructure and Volta-potential analyses were conducted to characterise intermetallic-particles (IMPs) in AA7075-T5. EIS and AFM were applied under operando-conditions to investigate anodisation processes. IMPs have pronounced influence on the growth of anodic aluminium oxide (AAO) films resulting in low charge-transfer resistance. Cu-bearing constituents show cathodic-character, whereas Mg2Si and MgZn2 particles show anodic-character. During anodisation, Al7Cu2Fe remain stable with ...
#1Ivar J. Halvorsen (SINTEF)H-Index: 19
#2Ivan Pivac (University of Split)H-Index: 6
Last. Federico Zenith (SINTEF)H-Index: 11
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Abstract Prognostics and health management for fuel cells in real-world applications are important for optimization of lifetime and operation. A parameter that has been shown to indicate the state of ageing is the low-frequency intercept with the real axis of the Nyquist diagram in a fuel cell's impedance spectrum. This article presents a method for direct identification of this parameter, without the need to carry out a full electrochemical impedance spectroscopy, and with an algorithm that can...
#1S. Fajardo (CSIC: Spanish National Research Council)H-Index: 21
#2Irene Llorente (CSIC: Spanish National Research Council)H-Index: 21
Last. David M. Bastidas (University of Akron)H-Index: 22
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Abstract Corrosion of TWIP austenitic steels Fe-Mn-3Al-3Si was studied using polarization curves, EIS tests and XPS. Results indicated that increased concentrations of Mn were detrimental to its corrosion resistance. XPS study revealed that pseudo-protective oxide layer was composed of FeO, Fe2O3, FeOOH, Al2O3, MnO and MnO2. Enrichment of Mn oxides in the outermost oxide layer was found as Mn increased in the TWIP steel bulk along with a decrease in Fe oxides. The increased corrosion susceptibil...
#1M. Faizan Khan (UPM: King Fahd University of Petroleum and Minerals)H-Index: 2
#2A. Madhan Kumar (UPM: King Fahd University of Petroleum and Minerals)H-Index: 21
Last. Luai M. Alhems (UPM: King Fahd University of Petroleum and Minerals)H-Index: 11
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Abstract Naturally formed oxide film on the surface of aluminum reduces corrosion rate to significant extent. Anodizing of aluminum is done to enhance this feature by increasing film thickness deliberately to desired level. In the current work, anodizing of Al-2024 alloy was carried out in sulfuric-acetic acid anodizing bath of different concentrations along with gradually increased applied potential. The structure and morphology of the developed anodized film was investigated with and without t...
#1Dino Klotz (MIT: Massachusetts Institute of Technology)H-Index: 22
Abstract Impedance analysis is not an easy task. This becomes even more obvious if unusual shapes appear in the impedance diagram. Here, a low frequency hook with positive imaginary part is discussed that often leaves researchers clueless of how to handle it, especially if there is no common model for the device under test that includes the hook, which is actually true for most electrochemical systems. The low frequency hook is explained from a systems theory perspective and a very basic explana...
#1R. Jaimes-Ramírez (UNAM: National Autonomous University of Mexico)H-Index: 1
#2A. Covelo (UNAM: National Autonomous University of Mexico)H-Index: 4
Last. M. P. Hernández (UNAM: National Autonomous University of Mexico)H-Index: 7
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#2F. Corvo (Autonomous University of Campeche)H-Index: 1
Abstract The corrosion behavior of anodized and non-anodized aluminum alloy 6061 in the presence of Aspergillus niger fungus was studied using electrochemical noise, recurrence plots and electrochemical impedance spectroscopy techniques. Corrosion potential measurements were also obtained. The fungus generated organic acids causing microbially induced corrosion of the specimens, which was more evident on non-anodized than on anodized aluminum alloy 6061, showing uniform and localized corrosion a...
Cited By1
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·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 characte...
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