Influence of the Anodizing Time on the Microstructure and Immersion Stability of Tartaric-Sulfuric Acid Anodized Aluminum Alloys
Tartaric-sulfuric acid anodizing (TSA) has been selected by the aerospace industry to replace Cr(VI)-based anodizing treatments of aluminum alloys. Modification of the bath composition can result in the necessity to revise the process conditions, including the time necessary to obtain the desired pr...
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| Format: | Article |
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MDPI AG
2023-05-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/5/993 |
| _version_ | 1797599039220350976 |
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| author | Florian Raffin Jacques Echouard Polina Volovitch |
| author_facet | Florian Raffin Jacques Echouard Polina Volovitch |
| author_sort | Florian Raffin |
| collection | DOAJ |
| description | Tartaric-sulfuric acid anodizing (TSA) has been selected by the aerospace industry to replace Cr(VI)-based anodizing treatments of aluminum alloys. Modification of the bath composition can result in the necessity to revise the process conditions, including the time necessary to obtain the desired properties of the anodized layer. This study focuses on the microstructure and immersion stability of the pilot scale anodized AA2024 aluminum alloy, with anodizing times of 25 min and 45 min. The layer structure was characterized by scanning electron microscopy (SEM) and glow discharge optical emission spectrometry (GD-OES). The electrochemical impedance spectroscopy (EIS) was used to evaluate the corrosion resistance and immersion stability of the samples in 0.01 M NaCl solution. The density of pores formed in the 45 min anodized samples was higher which correlated with higher impedance modulus at equivalent immersion time and higher thickness of the oxide layer. Contact angle measurements demonstrated better wettability of the 45 min anodized sample. The results suggest that 45 min anodizing offers higher corrosion resistance and better initial adhesion with subsequent post-treatment such as sealing or painting. |
| first_indexed | 2024-03-11T03:29:38Z |
| format | Article |
| id | doaj.art-28f05873d74f406badf6e79f890a7516 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T03:29:38Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-28f05873d74f406badf6e79f890a75162023-11-18T02:28:44ZengMDPI AGMetals2075-47012023-05-0113599310.3390/met13050993Influence of the Anodizing Time on the Microstructure and Immersion Stability of Tartaric-Sulfuric Acid Anodized Aluminum AlloysFlorian Raffin0Jacques Echouard1Polina Volovitch2Chimie ParisTech-CNRS, Institut de Recherche de Chimie Paris (IRCP), PSL University, 11 rue Pierre et Marie Curie, 75005 Paris, FranceSafran Landing Systems, 7 Rue Général Valérie André, 78140 Vélizy-Villacoublay, FranceChimie ParisTech-CNRS, Institut de Recherche de Chimie Paris (IRCP), PSL University, 11 rue Pierre et Marie Curie, 75005 Paris, FranceTartaric-sulfuric acid anodizing (TSA) has been selected by the aerospace industry to replace Cr(VI)-based anodizing treatments of aluminum alloys. Modification of the bath composition can result in the necessity to revise the process conditions, including the time necessary to obtain the desired properties of the anodized layer. This study focuses on the microstructure and immersion stability of the pilot scale anodized AA2024 aluminum alloy, with anodizing times of 25 min and 45 min. The layer structure was characterized by scanning electron microscopy (SEM) and glow discharge optical emission spectrometry (GD-OES). The electrochemical impedance spectroscopy (EIS) was used to evaluate the corrosion resistance and immersion stability of the samples in 0.01 M NaCl solution. The density of pores formed in the 45 min anodized samples was higher which correlated with higher impedance modulus at equivalent immersion time and higher thickness of the oxide layer. Contact angle measurements demonstrated better wettability of the 45 min anodized sample. The results suggest that 45 min anodizing offers higher corrosion resistance and better initial adhesion with subsequent post-treatment such as sealing or painting.https://www.mdpi.com/2075-4701/13/5/993TSA anodizingaluminum alloyelectrochemical impedance spectroscopycorrosion protection |
| spellingShingle | Florian Raffin Jacques Echouard Polina Volovitch Influence of the Anodizing Time on the Microstructure and Immersion Stability of Tartaric-Sulfuric Acid Anodized Aluminum Alloys Metals TSA anodizing aluminum alloy electrochemical impedance spectroscopy corrosion protection |
| title | Influence of the Anodizing Time on the Microstructure and Immersion Stability of Tartaric-Sulfuric Acid Anodized Aluminum Alloys |
| title_full | Influence of the Anodizing Time on the Microstructure and Immersion Stability of Tartaric-Sulfuric Acid Anodized Aluminum Alloys |
| title_fullStr | Influence of the Anodizing Time on the Microstructure and Immersion Stability of Tartaric-Sulfuric Acid Anodized Aluminum Alloys |
| title_full_unstemmed | Influence of the Anodizing Time on the Microstructure and Immersion Stability of Tartaric-Sulfuric Acid Anodized Aluminum Alloys |
| title_short | Influence of the Anodizing Time on the Microstructure and Immersion Stability of Tartaric-Sulfuric Acid Anodized Aluminum Alloys |
| title_sort | influence of the anodizing time on the microstructure and immersion stability of tartaric sulfuric acid anodized aluminum alloys |
| topic | TSA anodizing aluminum alloy electrochemical impedance spectroscopy corrosion protection |
| url | https://www.mdpi.com/2075-4701/13/5/993 |
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