ANODIZING OF Al 2024-T3 IN MIXTURES OF SULPHURIC-BORIC ACIDS

Sepulveda, Y.; Zagal, José H.; Henriquez, J.; Pavez, Jorge; Monsalve, Alberto; Bustos, O.; Thompson, G.E.

doi:10.4067/s0366-16442001000400003

Cited by 7 publications

(8 citation statements)

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“…15. Some authors (9)(10)(11) have reported that the mechanism of anodizing consists of the dissolution of the alloy in the metal-oxide interphase, with a migration of cations from the alloy to the electrolyte, and the entrance of oxygen ions to form oxides. Also, these authors report an enrichment of copper in the case of 2024 alloys in this interphase, after which copper oxide forms by combining with oxygen ions.…”

Section: R E S U Lt S a N D Discussionmentioning

confidence: 99%

“…In all the cases analysed, the statistical study is based on Maennig's works [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] , which considers a total of 50 samples by level of load, and three levels of load in the finite endurance range. Moreover, the statistical treatment of the data considers the function 3 ln P f , which transforms the relation with the stress logarithm into a straight line.…”

Section: R E S U Lt S a N D Discussionmentioning

confidence: 99%

“…9 Specifically, it is known that copper concentrates itself near the aluminiumoxide interface, becoming copper oxide. [10][11][12][13] The resulting Cu + ions 2 have higher mobility than Al + ions. 3 The highly alloyed second phase results in anodic sites, producing oxygen that exerts high pressure on the surrounding alumina phase.…”

Section: Introductionmentioning

confidence: 99%

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S‐N‐P curves in 7075 T7351 and 2024 T3 aluminium alloys subjected to surface treatments

Monsalve

Páez

Toledano

et al. 2007

Fatigue Fract Eng Mat Struct

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A B S T R A C T The S-N-P (stress, number of cycles, failure probability) curves for 2024 T3 and 7075 T7351 aluminium alloys were obtained. Previously, surface treatments of degreasing and different types of anodizing were applied to samples, evaluating the influence of these treatments on the fatigue life of the alloys. The determination of the S-N-P curves was done using Maennig's method. Rotary fatigue was used because this technique produces greater stress on the sample surfaces, the zone in which it is important to evaluate fatigue resistance. Both the transition range and the finite life range were evaluated, calculating the 1, 50 and 99% fracture probability. SEM was performed in order to characterize the fracture micromechanism. The conclusions were that Maennig's method is useful to evaluate fatigue life of these materials in a fast and efficient manner. Moreover, surface treatments produce a decrease in the fatigue life of both alloys, associating this effect with the surface damage produced on each sample during the treatment.

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Section: R E S U Lt S a N D Discussionmentioning

confidence: 99%

Section: R E S U Lt S a N D Discussionmentioning

confidence: 99%

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S‐N‐P curves in 7075 T7351 and 2024 T3 aluminium alloys subjected to surface treatments

Monsalve

Páez

Toledano

et al. 2007

Fatigue Fract Eng Mat Struct

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“…Figure 5 shows the typical voltage-time behaviour during galvanostatic anodising of high-purity aluminium in sulfuric acid. [8] Thus, at the onset of anodising, the voltage increased linearly with time at 1.1 ± 0.1 V s −1 to a maximum of 24 V. Subsequently, the voltage decreased gradually with time and eventually achieved a steady voltage of 19 V. Similarly, the voltage-time responses of the Al-Cu matrix (i.e. Al-1.3at.%Cu), model IMCs, AA2024-T3 and AA7075-T6 alloys, revealed an initial increase of voltage of 1.1±0.1 V s −1 (Fig.…”

Section: Linear Polarisation Behaviourmentioning

confidence: 99%

“…Such side reactions included oxygen evolution upon and dissolution of the IMCs. [8,12] Model IMCs and matrices synthesised by magnetron sputtering allowed the anodising behaviour of aluminium alloys to be further understood. Thus, the first peak observed in Fig.…”

Section: Behaviour Of Second-phase Constituents During Sulfuric Acid mentioning

confidence: 99%

Preferential anodic oxidation of second‐phase constituents during anodising of AA2024‐T3 and AA7075‐T6 alloys

Miera

Curioni

Skeldon

et al. 2010

Surface & Interface Analysis

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Model analogues of the metallurgical phases found in 2xxx and 7xxx series aluminium alloys were produced by magnetron sputtering and employed to investigate the local and general anodising behaviour of the alloys. Electrochemical tests, allied with scanning and transmission electron microscopy, enabled insight into the local anodising behaviour of the constituents and related effects on the overall porous oxide morphology. Under potentiodynamic conditions, the observed anodic current peaks of the commercial alloys were related with the anodic oxidation of specific second-phase particles. At 0 V, magnesiumcontaining particles, including S-phase, were preferentially removed from the alloy surface; at 5-6 V SCE , the copper-and/or iron-containing particles, such as θ phase and Al 7 Cu 2 Fe particles were anodically oxidised. The initial voltage transient revealed for the commercial alloys during galvanostatic anodising was related to the previous findings and reproduced by the use of coupled alloy analogues. Transmission electron microscopy revealed that the voltage transient associated with oxidation of second-phase material influence the morphology of the anodic film formed on the aluminium matrix.

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Tailoring the porous nanostructure of porous anodic alumina membrane with the impurity control

Abd‐Elnaiem

Mebed

Gaber

et al. 2016

Journal of Alloys and Compounds

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ANODIZING OF Al 2024-T3 IN MIXTURES OF SULPHURIC-BORIC ACIDS

Cited by 7 publications

References 0 publications

S‐N‐P curves in 7075 T7351 and 2024 T3 aluminium alloys subjected to surface treatments

S‐N‐P curves in 7075 T7351 and 2024 T3 aluminium alloys subjected to surface treatments

Preferential anodic oxidation of second‐phase constituents during anodising of AA2024‐T3 and AA7075‐T6 alloys

Tailoring the porous nanostructure of porous anodic alumina membrane with the impurity control

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