An FT-IRRAS-study of anodic oxide films on aluminum alloys and the impact of bath aging

Schneider, Michael; Gierth, Uta; Kremmer, K.

doi:10.1016/j.apsusc.2020.146438

Cited by 4 publications

(2 citation statements)

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“…F I G U R E 6 SEM cross-section of an anodic layer on an Al-Cu-Mg alloy (AA2024) formed in phosphoric sulfuric acid. [52] SEM, scanning electron microscopy.…”

Section: Nanopores-conventional Anodizing Layersmentioning

confidence: 99%

Anodizing—The pore makes the difference

Schneider

Fürbeth

2022

Materials & Corrosion

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The presentation gives an insight into the fascinating world of anodizing as corrosion protection but also goes far beyond. Starting with an introduction to the formation of anodic oxide films and their characteristic features, the authors briefly outline the subject of pore nucleation and growth. The number, size, and shape of the pores essentially determine the properties and play a crucial role in the final application of the anodizing layers. The tailoring of pore design, considering the final application as well as the use of the porous oxide layers for subsequent functional modifications, is demonstrated by examples, exclusively developed in the working groups of the respective authors or in joint research projects, which were in part professionally accompanied and supported by the German Corrosion Society GfKORR e.V.

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“…F I G U R E 6 SEM cross-section of an anodic layer on an Al-Cu-Mg alloy (AA2024) formed in phosphoric sulfuric acid. [52] SEM, scanning electron microscopy.…”

Section: Nanopores-conventional Anodizing Layersmentioning

confidence: 99%

Anodizing—The pore makes the difference

Schneider

Fürbeth

2022

Materials & Corrosion

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“…The structure of the oxide layer formed during anodizing, from the thickness to the pore diameter for example, depends on numerous parameters. The influence of these parameters (voltage, bath temperature, or nature of the electrolyte) on the anodic layer properties is well documented [5,[12][13][14][15][16][17][18][19]. For example, increasing the temperature of the bath increases the thickness of the oxide layer but can also impact the pore morphology [14].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Anodizing Time on the Microstructure and Immersion Stability of Tartaric-Sulfuric Acid Anodized Aluminum Alloys

Raffin

Volovitch

2023

Metals

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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.

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