Elevated corrosion in strain hardened Al Mg alloy

Neetu, .; Singh, Subhash; Rao, P.V.D. Somasekhar; Jayaganathan, R.; Midathada, Anil; Verma, Kartikey; Ravella, Uday K.

doi:10.1016/j.vacuum.2018.09.010

Cited by 5 publications

(6 citation statements)

References 45 publications

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“…Another discrepancy that needs to be explained is that Aballe et al [71] did not observe any relationship between the formation of crystallographic pitting and the existence of intermetallic particles, but Neetu et al [42] claimed that pit initiation occurred at particles rich in Fe and Mn. We observed spontaneously-formed pits on the undeformed samples; however, in contrast to both works, our observations indicate that crystallographic pit growth is often initiated in the areas occluded by secondary particles enriched with Si.…”

Section: Discussionmentioning

confidence: 98%

“…The pitting current, i p , shifted to higher values for the deformed areas after 3 h of immersion and continued to increase over time. Afterwards, an abrupt change in the current density was observed, which indicates the position of the pitting potential (E pit ) [25,42,58]. The pitting potential for both undeformed samples has the same value of E pit = −0.68 V/REF (Table 3).…”

Section: Corrosion Testing 421 Electrochemical Testingmentioning

confidence: 97%

“…In the deformed region (Figure 3), the subsequent bending altered the microstructure of the material, and the distribution of the intermetallic particles also changed; more coarse white precipitates were observed in the bending area (Figure 3a). Additionally, during deformation, a significant strain was introduced into the material and resulting from this, higher dislocation density occurred [42]. Therefore, a granular structure is not clearly distinguishable in the BSE contrast image; however, many dislocations, especially multiple slip bands, are visible (Figure 3b).…”

Section: Microstructure Characterizationmentioning

confidence: 99%

“…Since the 5xxx alloys do not respond to age hardening, previous reports regarding the electrochemical behavior of 5xxx alloys have also focused on post-processing heat-treatment and/or plastic deformation [39][40][41]. As stated by Neetu et al [42], the subsequent annealing of the AA5080 produced by multi-axial forging at room temperature drastically improved its corrosion resistance. The homogenization heat treatment of AA5083-O plates after casting had the optimal effect on the overall corrosion resistance of the material [40].…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Behavior of Cold-Formed AA5754 Alloy Sheets

et al. 2021

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In this work, the influence of bending an AA5457 alloy sheet and the resulting microstructural changes on its corrosion behavior was investigated. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to perform detailed microstructural analyses of the alloy in its original form and after bending. After immersion in naturally-aged NaCl under open-circuit conditions (0.5 M, adjusted to 3 by HCl), post-corrosion observations were made, and electrochemical polarization measurements were performed to investigate the corrosion mechanisms occurring on both surfaces. The results showed that the corrosion of AA5457 is a complex process that mainly involves trenching around coarse Si-rich particles, crystallographically-grown large pits, and the formation of multiple tiny pits around Si-rich nanoparticles. The experimental data showed that bending AA5457 changed the shape and distribution of Si-rich coarse particles, cumulated a higher dislocation density in the material, especially around Si-rich nanoparticles, and all of these factors caused that corrosion behavior of the AA5754 in the bending area was lowered.

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Section: Discussionmentioning

confidence: 98%

Section: Corrosion Testing 421 Electrochemical Testingmentioning

confidence: 97%

Section: Microstructure Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion Behavior of Cold-Formed AA5754 Alloy Sheets

et al. 2021

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“…Corrosion current (i corr ) and corrosion potential (E corr ) for polarisation curves can be calculated by the Tafel extrapolation method. Corrosion current helps in predicting the Corrosion rate with the help of following Eqn (3) 17 .…”

Section: Electrochemical Characterisationmentioning

confidence: 99%

Corrosion Behaviour of Multiaxial Compressed AlMgSi alloy

Roy

Kumar

2021

Def. Sc. J.

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In the present study, AlMgSi alloy was processed through multi-axial compression (MAC) to produce ultrafine-grained microstructure at room temperature. The AlMgSi alloys are widely used in automobile industries for making cylinder heads and brake disks etc. MAC was performed up to three cycles and showed improvement in mechanical properties. The impact of different strain levels upon microstructure changes is investigated using electron backscatter diffraction (EBSD). The average grain size reduced from an initial average grain size of ~ 124 to ~ 3 μm after completion of three cycles of MAC processing. Samples were tested for mechanical properties using uniaxial tensile test, hardness measurements, and corrosion. Tensile test results show a considerable increase in yield strength from ~90 MPa to ~249 MPa after 3 cycles of MAC. The average hardness value increased from 52 VHN to 90 VHN after 3 cycles of MAC. The corrosion resistance of MAC processed samples was found to decrease in comparison to solution-treated samples.

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