Electrochemical behavior of anodized AA6063-T6 alloys affected by matrix structures

Huang, Yung Sen; Shih, Teng Shih; Wu, Chen En

doi:10.1016/j.apsusc.2012.10.036

Cited by 17 publications

(6 citation statements)

References 24 publications

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“…The dissolution of SP/IMC at the film-matrix interface drove aluminum and magnesium ions to move toward electrolytes leaving the Si particles remaining in the film, as shown in Figure 11c [27]. Consequently, the anodized and sealed T6 sample obtained inferior corrosion current density to the bare T6 sample (3.6ˆ10´5 A/cm 2 vs. 2.6ˆ10´6 A/cm 2 ).…”

Section: Fatigue and Corrosion Testsmentioning

confidence: 89%

“…The CFT6a samples exhibited slightly inferior Ecorr (−1.0 V) and Icorr (4.7 × 10 −6 A/cm 2 ) than the T6 sample did (−0.93 V and 2.6 × 10 −6 A/cm 2 , respectively). After anodization and sealing, the anodized films on the aluminum alloy samples contained mainly amorphous alumina and a few hydrated alumina [27]. These AAO films could significantly enhance the corrosion resistance of the aluminum alloys [28].…”

Section: Fatigue and Corrosion Testsmentioning

confidence: 98%

“…Decreasing SP/IMC particle size and counts also reduced the size and counts of the Si particles that remained in the anodized film to undergo a minor change in corrosion current density (4.7 × 10 −6 vs. 3.86 × 10 −6 A/cm 2 ) in the bare CFT6a and anodized/sealed CFT6a samples. After anodization and sealing, the anodized films on the aluminum alloy samples contained mainly amorphous alumina and a few hydrated alumina [27]. These AAO films could significantly enhance the corrosion resistance of the aluminum alloys [28].…”

Section: Fatigue and Corrosion Testsmentioning

confidence: 98%

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Effects of Cryogenic Forging and Anodization on the Mechanical Properties and Corrosion Resistance of AA6066–T6 Aluminum Alloys

Shih

Yong

Hsu

2016

Metals

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Abstract:In this study, AA6066 alloy samples were cryogenically forged after annealing and then subjected to solution and aging treatments. Compared with conventional 6066-T6 alloy samples, the cryoforged samples exhibited a 34% increase in elongation but sacrificed about 8%-12% in ultimate tensile strength (UTS) and yield stress (YS). Such difference was affected by the constituent phases that changed in the samples' matrix. Anodization and sealing did minor effect on tensile strength of the 6066-T6 samples with/without cryoforging but it decreased samples' elongation about 8%-10%. The anodized/sealed anodic aluminum oxide (AAO) film enhanced the corrosion resistance of the cryoforged samples.

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Section: Fatigue and Corrosion Testsmentioning

confidence: 89%

Section: Fatigue and Corrosion Testsmentioning

confidence: 98%

Section: Fatigue and Corrosion Testsmentioning

confidence: 98%

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Effects of Cryogenic Forging and Anodization on the Mechanical Properties and Corrosion Resistance of AA6066–T6 Aluminum Alloys

Shih

Yong

Hsu

2016

Metals

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“…Since Al(OH) 3 hydrated oxide tends to form on the AAO surface, 43 pitting is prone to initiate at the AAO surface where Al(OH) 3 is highly concentrated. 44 The deposited particle in Fig. 3c is most likely deposited Al(OH) 3 forming a dome-like structure.…”

Section: Skpfm Evaluation Of Corrosion Tendency Of Impsmentioning

confidence: 93%

In Situ and Operando AFM and EIS Studies of Anodization of Al 6060: Influence of Intermetallic Particles

Zhang

Nilsson²,

Pan

2016

J. Electrochem. Soc.

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In this study, anodization of an Al 6060 alloy has been investigated by in-situ electrochemical atomic force microscopy (EC-AFM) and electrochemical impedance spectroscopy (EIS) under operando conditions, to elucidate the role of intermetallic particles (IMPs) in the alloy. The Volta potential maps measured by scanning Kelvin probe force microscopy (SKPFM) reveal that the relative nobility is higher for AlFeSi type and lower for Mg2Si type of particles as compared with the alloy matrix. The EIS results obtained at anodizing potentials show that the thickness of the barrier oxide layer increases linearly with the applied potential, but the oxide growth rate is lower than that of single crystal samples reported previously. Moreover, the EIS spectra show an inductive loop at low frequencies indicating an anodic dissolution process. The EC-AFM images display detailed morphological changes related to the IMPs during the anodization, which reveal certain localized dissolution in parallel to anodic Al oxide (AAO) formation on the alloy. The combined AFM and EIS measurements demonstrate that the IMPs in the alloy cause localized dissolution during anodization, resulting in a reduced AAO growth rate. The corrosion resistance of as-produced AAO film is low unless anodized at sufficiently high potential.

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“…When compared to the appearance of the as-received, uncoated material, the surface was uniformly covered with a matt film, which had been successfully formed on the Al-Mg-Si alloy substrate. In general, if a surface treatment is effective for pure Al, it will often fail to work with Al alloys, because some components of the Al alloys suppress the formation of the films [24,25]. Non-uniform microstructures, such as the second-phase particles in an aluminum alloy, play a major role in the passivity breakdown and pit morphology of aluminum alloys in seawater [26,27].…”

Section: Characterization Of Filmmentioning

confidence: 99%

Formation of Anticorrosive Film for Suppressing Pitting Corrosion on Al-Mg-Si Alloy by Steam Coating

et al. 2018

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Al alloys offer excellent physical and mechanical properties, such as a low density, high specific strength, and good ductility. However, their low corrosion resistance has restricted their application in corrosive environments. There is a need, therefore, for a novel coating technology that is capable of improving the corrosion resistance of Al alloys. In the present study, we examined a steam-based method of forming a corrosion-resistant film on Al alloys. Al-Mg-Si alloy was used as the substrate. The cleaned substrates were set in an autoclave with ultrapure water as the steam source and processed using different temperatures and holding times, resulting in the formation of anticorrosive films on the alloy. FE-SEM images of the film surfaces showed that plate-like nanocrystals were densely formed over the entire surface. XRD patterns indicated that the film was composed mainly of AlOOH crystals. The potentiodynamic polarization curves revealed that the corrosion current density of the film-coated substrates significantly decreased, and that the pitting corrosion was completely suppressed, indicating that the corrosion resistance of the Al-Mg-Si alloy was improved by the film formed by means of steam coating.

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Electrochemical behavior of anodized AA6063-T6 alloys affected by matrix structures

Cited by 17 publications

References 24 publications

Effects of Cryogenic Forging and Anodization on the Mechanical Properties and Corrosion Resistance of AA6066–T6 Aluminum Alloys

Effects of Cryogenic Forging and Anodization on the Mechanical Properties and Corrosion Resistance of AA6066–T6 Aluminum Alloys

In Situ and Operando AFM and EIS Studies of Anodization of Al 6060: Influence of Intermetallic Particles

Formation of Anticorrosive Film for Suppressing Pitting Corrosion on Al-Mg-Si Alloy by Steam Coating

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