Pitting potential of high purity binary aluminium alloys—I. AlCu alloys. Pitting and intergranular corrosion

Müller, Ivan; Galvele, J.R.

doi:10.1016/0010-938x(77)90044-0

Cited by 196 publications

(114 citation statements)

References 8 publications

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“…AA2024-T3, T3+ and water-quenched SHT alloys exhibited two breakdown potentials, while only one breakdown potential was found for T8, T8+ , and furnace-cooled AA2024-SHT alloys. Muller and Galvele [2] reported that aging Al-4% Cu could produce a decrease of more than 100 mV in the breakdown potential as a result of formation of Al 2 Cu intermetallic particles and depletion of copper from the matrix. In the case of AA2024, it is expected that aging allows more precipitation of fine intermetallic particles such as S phase from matrix, leaving a copperimpoverished matrix and forming copper-depleted zones along the subgrain and grain boundaries, both of which can decrease the breakdown potentials of the alloys.…”

Section: Effect Of Artificial Agingmentioning

confidence: 99%

“…For example, chloride ions have been reported to be necessary for both pitting and IGC in Al alloys [1]. The growth of pits and IGC is believed to depend on potential [2]. As pits grow into the microstructure, they can develop into IGC or exfoliation (a form of IGC found in wrought Al alloys), which can penetrate deeply into the microstructure [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…As pits grow into the microstructure, they can develop into IGC or exfoliation (a form of IGC found in wrought Al alloys), which can penetrate deeply into the microstructure [3,4]. To some extent, IGC can be regarded as a special kind of pitting corrosion occurring preferentially at the grain boundaries for Al alloys since the mechanism of IGC was found to be of the same nature as the process of pitting [1,2,[5][6][7][8]. However, differences clearly exist between pitting and IGC.…”

Section: Introductionmentioning

confidence: 99%

“…However, differences clearly exist between pitting and IGC. For example, artificial aging is thought to minimize IGC susceptibility, but may not necessarily improve pitting resistance [2,9,10]. Furthermore, the growth kinetics for IGC may be different than for pitting.…”

Section: Introductionmentioning

confidence: 99%

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Transitions between pitting and intergranular corrosion in AA2024

Zhang

Frankel

2003

Electrochimica Acta

241

152

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The pitting and intergranular corrosion (IGC) behavior of various tempers of AA2024 was investigated in 1 M NaCl. The breakdown potentials associated with pitting or IGC were determined. The breakdown potentials were found to be almost independent of sample orientation for any given temper. Artificial aging had a strong effect on polarization behavior and localized corrosion morphology. The anodic polarization curves of AA2024 in the solution heat treated and water-quenched condition, T3, and T3+ tempers exhibited two breakdown potentials, whereas overaged AA2024-T8, T8+ , and solutionized and furnace cooled AA2024 exhibited only one breakdown potential. When two breakdown potentials were observed, the more active one was found to be related to the transient dissolution of S phase Al 2 CuMg particles leading to pitting while the noble one was thought to result primarily from initiation and growth of IGC. The breakdown potentials decreased with increasing aging time at 190°C, and only one breakdown potential was measured for T8 and T8+ tempers. Unlike the T3 temper, no sharp IGC was found for these tempers. Selected granular attack from breakdown of the copper-depleted matrix was believed to be the cause for localized corrosion in the T8 and T8+ tempers. The effect of nitrate and sulfate ions on the localized corrosion behavior was also studied.

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Section: Effect Of Artificial Agingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Transitions between pitting and intergranular corrosion in AA2024

Zhang

Frankel

2003

Electrochimica Acta

241

152

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“…A great effort has been made to analyze the corrosion behavior of high strength aluminum alloys. In particular, AA2024-T3 is among the most extensively studied alloys, and the mechanisms of corrosion have been debated in the literature [5,[7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

A study of the mechanisms of corrosion inhibition of AA2024-T3 by vanadates using the split cell technique

Iannuzzi

Kovač

Frankel

2007

Electrochimica Acta

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The mechanisms of corrosion inhibition of AA2024-T3 by vanadates were studied in this work using the split cell technique and polarization curves. The electrochemical behavior of clear solutions containing metavanadates and orange solutions containing decavanadates was clearly distinctive. Injection of metavanadates to the cathode side of the different split cell setups greatly reduced the galvanic current, indicating a potent inhibition of the oxygen reduction kinetics. The galvanic current never exhibited a transient current peak, suggesting that metavanadates inhibit AA2024-T3 corrosion by a mechanism that does not involve electrochemical reduction. Injection of metavanadate to the anode side of the different split cells had no effect on the galvanic current. Injection of orange decavanadate to the cathode side of the AA2024-T3 split cell resulted in a large current peak, associated with the electrochemical reduction of decavanadate. However, decavanadates did not impart significant corrosion protection.

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General, Galvanic, and Localized Corrosion of Aluminum and Its Alloys

2010

Corrosion Resistance of Aluminum and Magnesium Alloys

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Pitting potential of high purity binary aluminium alloys—I. AlCu alloys. Pitting and intergranular corrosion

Cited by 196 publications

References 8 publications

Transitions between pitting and intergranular corrosion in AA2024

Transitions between pitting and intergranular corrosion in AA2024

A study of the mechanisms of corrosion inhibition of AA2024-T3 by vanadates using the split cell technique

General, Galvanic, and Localized Corrosion of Aluminum and Its Alloys

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