Effect of new sealing treatments on corrosion fatigue lifetime of anodized 2024 aluminium alloy

Priet, Bertrand; Odemer, Grégory; Blanc, Christine; Giffard, Kévin; Arurault, Laurent

doi:10.1016/j.surfcoat.2016.07.083

Cited by 33 publications

(22 citation statements)

References 30 publications

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“…The decrease in fatigue durability, caused by the anodic coating on aluminum alloys, is mentioned at several research studies. This fatigue susceptibility is attributed to the brittle and porous nature of the anodizing oxide layer . Moreover, the anodized oxide film is vulnerable to microcracking.…”

Section: Resultsmentioning

confidence: 99%

“…The variations in thermal expansion coefficients among the oxide layer and the aluminum substrate might be responsible for these microcracks that are formed on the oxide film. Induced tensile residual stresses on the coating can also worsen the fatigue strength . Because the anodizing film is noticeably adhered to the substrate (aluminum alloy), any surface crack, which might be formed throughout the sealing procedure, can effortlessly advance into the substrate.…”

Section: Resultsmentioning

confidence: 99%

“…Despite that fact, the porous outer layer is brittle and can cause the effortless formation and propagation of cracks into the substrate. Therefore, the fatigue strength of the metal can dramatically be reduced …”

Section: Introductionmentioning

confidence: 99%

“…The fatigue strength and crack propagation of several types of aluminum alloy are well documented in literature . However, the synergistic effects, between cyclic alternating mechanical loads and chemical degradation, remain still elusive.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the fatigue strength of the metal can dramatically be reduced. [5][6][7] Micro-arc deposition of ceramic coatings, plasma electrolytic oxidation (PEO), and hard anodized ceramic coatings have been used in the past on light materials (including aluminum alloys) to enhance tribological properties and improve corrosion resistance. During the last decade, it has been shown that by using appropriate sealing processes and better quality of coatings surfaces, these hard oxides do not deteriorate the fatigue durability of aluminum Nomenclature: AA, Aluminum Alloy; EDM, Electrical Discharge Machining; FEM, Finite Element Method; MAO, Microarc Oxidation; OCP, Open Circuit Potential; PEO, Plasma Electrolytic Oxidation; SCE, Saturated Calomel Electrode alloys.…”

Section: Introductionmentioning

confidence: 99%

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A study on corrosion‐fatigue behavior of AA7075‐T651 subjected to different surface modification treatments

Michailidis

Stergioudi

Ragousis

et al. 2019

Fatigue Fract Eng Mat Struct

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Two corrosive media were used (3.5 wt% NaCl aqueous solution and distilled water) to examine the corrosion‐fatigue behavior of AA 7075‐T651, subjected to various surface modifications (wire‐EDM, blasting, and anodizing). An in‐situ corrosion‐fatigue device was used to test the corrosion‐fatigue durability. The apparatus is able to generate cyclic loads within a corrosive solution. The mechanical loading is simulated with the aid of finite element method (FEM). At both corrosive environments, a prolongation of the corrosion‐fatigue life was achieved by the blasting procedure, compared with the as‐machined specimens under same conditions. Anodizing had a deleterious impact in all examined cases.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A study on corrosion‐fatigue behavior of AA7075‐T651 subjected to different surface modification treatments

Michailidis

Stergioudi

Ragousis

et al. 2019

Fatigue Fract Eng Mat Struct

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Fatigue Resistance of an Anodized and Hardanodized 6082 Aluminum Alloy Depending on the Coating Thickness in the High Cycle Regime

Winter,

Lampke

2023

Adv Eng Mater

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This study investigates the high cycle fatigue behavior of an anodized 6082 aluminum alloy. Main focus is on the most relevant influencing factors for crack initiation and propagation under cyclic loading and damage mechanisms considering coating type, thickness and residual stresses. The bare substrate is compared to anodized and hardanodized specimens with three coating thicknesses, for each coating type, in the range from 20 to 70 µm. Coating hardness and microstructure as well as residual stresses are analyzed. Fatigue and fracture behavior under alternating tension‐compression loading is determined. Dependent on the coating thickness, the fatigue strength is reduced by 8‐50 % after anodizing and by 50–62 % after hardanodizing. As the coating thickness is equal to the initial crack length from a fracture mechanical point of view, stress intensities at the crack tips are higher for thicker coatings respectively longer initial crack lengths. Therefore, propagation of fatigue induced cracks from the coating into the substrate is promoted for a higher coating thickness resulting in premature failure. A significant correlation between the coating thickness and tensile residual stresses induced by both coatings in the subjacent substrate is not found and residual stress influence on the overall fatigue strength is only minor.This article is protected by copyright. All rights reserved.

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Accurate evaluations of both porosity and tortuosity of anodic films grown on rolled AA 1050 and on rolled or machined AA 2024 T3

Giffard

Arurault

Blanc

et al. 2018

Surface & Interface Analysis

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The porosity of the anodic films grown on aluminium substrates depends on various operating conditions related to the anodization electrolyte and to the applied electrical parameters, as well as to the substrate itself. In the present study, three different aluminium substrates were studied and anodized: AA 1050 (rolled; thickness = 1 mm), AA 2024 T3 (rolled; 1 mm), and AA 2024 T3 (machined; 3 mm). For each type of anodic film, the porosity, as well as its changes during anodization, was accurately characterized using both field‐emission gun scanning electron microscopy (FEG‐SEM) and a reanodization technique. Moreover, for the first time, the corresponding tortuosity was quantified for all studied substrates. Results for rolled AA 2024 T3 and for machined AA 2024 T3 especially showed significant differences in tortuosity values, contributing towards clarifying, in part, their different wettability characteristics or anticorrosion behaviour, so far not clearly explained.

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Effect of new sealing treatments on corrosion fatigue lifetime of anodized 2024 aluminium alloy

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

Cited by 33 publications

References 30 publications

A study on corrosion‐fatigue behavior of AA7075‐T651 subjected to different surface modification treatments

A study on corrosion‐fatigue behavior of AA7075‐T651 subjected to different surface modification treatments

Fatigue Resistance of an Anodized and Hardanodized 6082 Aluminum Alloy Depending on the Coating Thickness in the High Cycle Regime

Accurate evaluations of both porosity and tortuosity of anodic films grown on rolled AA 1050 and on rolled or machined AA 2024 T3

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