On understanding the effect of benzotriazole during barrier-film growth on Al-Cu alloys

Páez, Maritza; Biaggio, Sonia R.; Rocha‐Filho, Romeu C.; Sepulveda, Y.; Zagal, José H.; Monsalve, Alberto; Zhou, Xiaorong; Skeldon, P.; Thompson, G.E.

doi:10.1007/s10008-002-0345-9

Cited by 6 publications

(4 citation statements)

References 24 publications

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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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show abstract

“…The corrosion enhancement of aluminium alloys is usually achieved by anodizing in sulfuric acid media [5]. However, the large size of the intermetallic precipitates also disturbs the anodizing layer growth [6,7]; consequently, the anodizing process must be followed by a sealing process to increase the corrosion resistance. Since the new ecological regulations have prohibited the use of hexavalent chromium, many alternative treatments are currently studied.…”

Section: Introductionmentioning

confidence: 99%

Initial stages of multi-phased aluminium alloys anodizing by MAO: micro-arc conditions and electrochemical behaviour

Veys‐Renaux

Rocca

2015

J Solid State Electrochem

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International audienceThe electrochemical behaviour of AA1050 and AA2214 alloys was studied in a KOH/silicate in order to investigate the first stages of the coating formation during MAO process (by SEM and electrochemical measurements). Before the sparking initiation, occurring around 300 V for both alloys, a thin inner layer of aluminium oxide grows by a classical anodizing mechanism, and induces a great enhancement of the electrochemical resistance. Then, the micro-arc regime beyond 300 V leads to the formation of a dense, thicker but cracked external aluminium oxide layer. Afterwards, from 400 V, a sharp increase of current density named ``current wall'' and due to an increase of oxide conductivity, leads to a significant oxygen release and the occurrence of large and energetic sparks. Microscopic analyses reveal that the presence of copper-rich intermetallic phases in the multi-phased alloy (AA2214) induces the incorporation of copper nanoparticles in the gamma-alumina layer formed by the sparking phenomenon. These copper particles increase the reaction of water oxidation during the classical anodizing stage, and result in a delay of the sparking initiation during the galvanostatic anodizing and in a lower electrochemical resistance of the anodized layers

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On the corrosion behavior of Al2Cu by local electrochemical impedance spectroscopy using droplet cell microscopy

Rajan

Neelakantan

2016

J Solid State Electrochem

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On understanding the effect of benzotriazole during barrier-film growth on Al-Cu alloys

Cited by 6 publications

References 24 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

Initial stages of multi-phased aluminium alloys anodizing by MAO: micro-arc conditions and electrochemical behaviour

On the corrosion behavior of Al2Cu by local electrochemical impedance spectroscopy using droplet cell microscopy

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