Corrosion Behavior of AA6012 Aluminum Alloy Processed by ECAP and Cryogenic Treatment

Viceré, Annamaria; Roventi, G.; Paoletti, Chiara; Cabibbo, Marcello; Bellezze, T.

doi:10.3390/met9040408

Cited by 19 publications

(14 citation statements)

References 43 publications

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“…In this respect, previous works by one of these authors showed that the different strain paths to which tempered aluminum alloys can be subjected by ECAP are able to effectively influence the secondary-phase precipitates volume fraction [65,66]. Indeed, this did not induce a marked deterioration of other important properties such as corrosion resistance, as reported by Vicerè et al [67,68]. In ECAP, samples are usually in form of cylindrical or square-section rod billets that are continuously forced to follow a linear path into a L-shaped equal-channel [69][70][71][72][73][74][75][76][77][78].…”

Section: Introductionmentioning

confidence: 57%

High-Temperature Equal-Channel Angular Pressing of a T6-Al-Cu-Li-Mg-Ag-Zr-Sc Alloy

Cabibbo

Paoletti

2021

JMMP

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Equal-channel angular pressing (ECAP) is known to induce significant grain refinement and formation of tangled dislocations within the grains. These are induced to evolve to form low-angle boundaries (i.e., cell boundaries) and eventually high-angle boundaries (i.e., grain boundaries). On the other hand, the precipitation sequence of age hardening aluminum alloys can be significantly affected by pre-straining and severe plastic deformation. Thus, ECAP is expected to influence the T6 response of aluminum alloys. In this study, a complex Al-Cu-Mg-Li-Ag-Zr-Sc alloy was subjected to ECAP following different straining paths. The alloy was ECAP at 460 K via route A, C, and by forward-backward route A (FB-route A) up to four passes. That is, ECAP was carried out imposing billet rotation between passes (route A), billet rotation by +90° between passes (route C), and billet rotation by +90° and inversion upside down between passes (FB-route A). The alloy was also aged at 460 K for different durations after ECAP. TEM microstructure inspections showed a marked influence of the different shearing deformations induced by ECAP on the alloy aging response. The precipitation kinetics of the different hardening secondary phases were affected by shearing deformation and tangled dislocations. In particular, the T1-Al2CuLi phase was the one that mostly showed a precipitation sequence speed up induced by the tangled dislocations formed during ECAP. The T1 phase was found to grow with aging time according to the Lifshitz-Slyozov-Wagner low-power regime.

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Section: Introductionmentioning

confidence: 57%

High-Temperature Equal-Channel Angular Pressing of a T6-Al-Cu-Li-Mg-Ag-Zr-Sc Alloy

Cabibbo

Paoletti

2021

JMMP

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“…8. The inductive element is not used in the EEC to curve fit the EIS data because the inductive loop is not well defined and the curve fitting of the inductive character observed in the present EIS data will not yield the appropriate information, hence the typical Randle circuit is used to fit the only capacitive loop [36]. The corrosion parameters attained from curve fitting of EIS data are tabulated in Table 3.…”

Section: Electrochemical Corrosion Analysismentioning

confidence: 99%

“…In the used EEC, Rs represents the solution resistance, the RC couple denotes the charge transfer resistance Rct and the double layer constant phase element Qdl (i.e., double layer capacitance which forms at the working electrode/electrolyte interface because of the adsorbed ions on the working electrode surface) [35,36]. The constant phase element exponent 'n' value obtained from EEC analysis is less than '1' and it may due to the surface roughness created from the adsorbed corrosion products on the working electrode.…”

Section: Electrochemical Corrosion Analysismentioning

confidence: 99%

Enhancement in the corrosion resistance of nanocrystalline aluminium coatings by incorporation of graphene oxide

Kumar

Laxmeesha

Ray

et al. 2020

Applied Surface Science

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Non-aqueous electrolyte containing aluminium chloride (AlCl3) and 1-ethyl-3methylimidazolium chloride ([EMIm]Cl) topped with n-decane was used to electrodeposit aluminium (Al) coating via chronoamperometric method at ambient atmosphere. Aluminiumgraphene oxide (Al-GO) composite coating was further obtained from the Al electrolytic bath by dispersing GO in it. GO was prepared by oxidation of high purity graphite. The Al deposition potential was noted by cyclic voltammetry (CV) method. Influence of GO on the morphology and microstructure of Al metal matrix was analysed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction spectroscopy (XRD). Inclusion of GO into the Al matrix enhanced the coating compactness thus nullifying the surface defects which were observed for the pristine Al deposit. The texture co-efficient calculation showed that the addition of GO altered the growth texture from growth predominately along (002) plane for pure Al coating to growth predominantly along (111) and (022) plane for Al-GO composite coating. The morphological and microstructural changes occurred in the Al coating from GO incorporation influenced the anti-corrosion behaviour of the coatings. The electrochemical corrosion analysis by Tafel polarization and Impedance Spectroscopy confirmed that the GO reinforced Al deposit possessed two-fold enhanced anticorrosive property than pure Al coating.

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“…The ECAP processes for Al alloys are significantly interesting in the automotive, aerospace, and building industries. Exceptional mechanical [15][16][17][18][19][20][21] and electrochemical properties [21][22][23][24][25][26][27] are observed in Al alloys because of ECAP.…”

Section: Introductionmentioning

confidence: 99%

Effect of Severe Plastic Deformation, through Equal-Channel Angular Press Processing, on the Electrochemical Behavior of Al5083 Alloy

2020

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In this study, Al5083 alloy was deformed through equal-channel angular pressing (ECAP) up to three passes. The ECAP was conducted at room temperature in a mold using route C. The microstructure evolution was investigated under optical microscopic observations. The grain size was measured using ImageJ software. Grain refinement from 145 µM (as received) to 37 µM (after third pass) was observed due to ECAP. The potentiodynamic polarization of the Al5083 alloy was obtained from a 3.5% sodium chloride solution. Electrochemical impedance spectroscopy was performed in the sodium chloride solution to study the alloy’s surface properties. Scanning electron microscopy and Raman spectroscopy were conducted after obtaining the corrosion performance. As a result, we found that ECAP processing leads to the grain refinement of the alloy, which causes a detrimental effect on the corrosion resistance property.

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Corrosion Behavior of AA6012 Aluminum Alloy Processed by ECAP and Cryogenic Treatment

Cited by 19 publications

References 43 publications

High-Temperature Equal-Channel Angular Pressing of a T6-Al-Cu-Li-Mg-Ag-Zr-Sc Alloy

High-Temperature Equal-Channel Angular Pressing of a T6-Al-Cu-Li-Mg-Ag-Zr-Sc Alloy

Enhancement in the corrosion resistance of nanocrystalline aluminium coatings by incorporation of graphene oxide

Effect of Severe Plastic Deformation, through Equal-Channel Angular Press Processing, on the Electrochemical Behavior of Al5083 Alloy

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