Enhancing corrosion resistance of anodized AA7075 alloys by electrodeposition of superhydrophobic coatings

Verro, Vincenzo; Di Franco, Francesco; Zaffora, Andrea; Santamaria, Monica

doi:10.1016/j.colsurfa.2023.132040

Cited by 9 publications

(2 citation statements)

References 19 publications

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“…AA2024-0 also demonstrated the highest value of mixed corrosion behavior. Our findings not only reaffirm the significance of the Lyapunov exponent but also extend its applicability to corrosion behavior classification, furnishing a valuable analytical tool for understanding and predicting corrosion dynamics [66][67][68].…”

Section: Discussionsupporting

confidence: 70%

Electrochemical Noise Analysis Using Experimental Chaos Theory, Power Spectral Density and Hilbert–Huang Transform in Anodized Aluminum Alloys in Tartaric–Phosphoric–Sulfuric Acid Solutions

Martínez-Ramos,

Olguin-Coca,

Lopez-Leon

et al. 2023

Metals

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Aluminum and its alloys find widespread applications across diverse industries such as the automotive, construction, and aeronautics industries. When these alloys come into contact with ambient air, an Al2O3 thin oxide layer is naturally formed, typically measuring 2 to 4 nm and exhibiting remarkable hardness and protective qualities, rendering the alloys corrosion-resistant in specific atmospheric and chemical environments. This study aimed to characterize the electrochemical behaviors of anodized AA2024 and AA7075 alloys within a complex three-component electrolyte composed of tartaric–phosphoric–sulfuric acid (TPSA) solutions. The anodized specimens were subsequently exposed to 3.5 wt.% NaCl solution at room temperature, and their electrochemical performances were meticulously evaluated using an electrochemical noise (EN) analysis in accordance with ASTM G-199, respectively. In the EN, three methods of data analysis were used: the time domain analysis (chaos analysis: application of Lyapunov exponent and dimension correlation), the frequency domain analysis (power spectral density, PSD), and the time–frequency domains analysis (Hilbert–Huang transform, HHT). Scanning electron microscopy (SEM) was used to observe the morphologies of the anodized surfaces. The results indicated that the AA2024-0, AA2024-1, and AA2024-2 alloys and the AA7075-2 and AA7075-3 samples exhibited mixed corrosion according to the Lyapunov constant, with a notable inclination towards localized corrosion when analyzed using the PSD and HHT methods. The surface was not homogenous, and the corrosion process was predominately localized in specific zones.

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Section: Discussionsupporting

confidence: 70%

Electrochemical Noise Analysis Using Experimental Chaos Theory, Power Spectral Density and Hilbert–Huang Transform in Anodized Aluminum Alloys in Tartaric–Phosphoric–Sulfuric Acid Solutions

Martínez-Ramos,

Olguin-Coca,

Lopez-Leon

et al. 2023

Metals

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“…Corrosion testing plays a crucial role in the qualification and certification of materials for technological applications. The barrier properties of aluminum anodic oxide films have been widely studied under immersion [5][6][7][8][9] and various salts spray testing. 1,[10][11][12][13] Although most corrosion testing methods are common to several metallic materials, some of them and the testing solutions are usually specific to a given material and a given form of corrosion.…”

mentioning

confidence: 99%

The Effect of Spray Testing Condition on the Corrosion Performance of Hydrothermally Sealed Anodic Oxide on a 5005 Aluminum Alloy: Comparison between Neutral Salt Spray, Acetic Salt Spray and Prohesion Testing Methods

Ramdé,

Fedel,

Rossi

2024

J. Electrochem. Soc.

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In this work, the output of different accelerated tests on anodic aluminum oxide (AAO) coatings developed on AA5005 aluminum alloy (sulfuric acid bath and hydrothermal sealing) has been investigated. In particular, three corrosion testing methods, namely neutral salt spray test (NSS), acetic acid salt spray (AASS) and prohesion test, have been performed on the sealed AAO-coated panels in order to investigate the reliability of the obtained results to the electrochemical impedance ones. NSS and prohesion testing results are found to align with findings from electrochemical impedance spectroscopy (EIS). The acetic salt spray test proved highly corrosive, causing rapid depletion of the oxide layer's protective capabilities, as indicated by the EIS analysis. These results seem to be underestimated by optical image analysis.

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Acid wet blasting method for fabricating superhydrophobic aluminum surface with micro-nano composite structures

Zhai,

Liu,

Mohamed

et al. 2024

Appl. Phys. A

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Enhancing corrosion resistance of anodized AA7075 alloys by electrodeposition of superhydrophobic coatings

Cited by 9 publications

References 19 publications

Electrochemical Noise Analysis Using Experimental Chaos Theory, Power Spectral Density and Hilbert–Huang Transform in Anodized Aluminum Alloys in Tartaric–Phosphoric–Sulfuric Acid Solutions

Electrochemical Noise Analysis Using Experimental Chaos Theory, Power Spectral Density and Hilbert–Huang Transform in Anodized Aluminum Alloys in Tartaric–Phosphoric–Sulfuric Acid Solutions

The Effect of Spray Testing Condition on the Corrosion Performance of Hydrothermally Sealed Anodic Oxide on a 5005 Aluminum Alloy: Comparison between Neutral Salt Spray, Acetic Salt Spray and Prohesion Testing Methods

Acid wet blasting method for fabricating superhydrophobic aluminum surface with micro-nano composite structures

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