Influence of Post Weld Heat Treatment on Microstructure and Pitting Corrosion Behavior of Dissimilar Aluminium Alloy Friction Stir Welds

Vikas, K. Sri Ram; Ramana, V.S.N. Venkata; Mohammed, Raffi; Reddy, G. Madhusudhan; Rao, K. Srinivas

doi:10.1016/j.matpr.2019.05.032

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…The results of the tafel analyzes are summarized in Table 4. AA6061-O alloy displayed a corrosion potential of -741mV [53] compared to -659mV of the AA2024-O alloy [56]. The HH condition welded joint presented a similar behavior to the AA6061-O alloy; it is due to the Mg content, which generates a passivating effect, enhanced by the refinement of the grain size in the stir region [54], obtaining a low corrosion rate.…”

Section: Corrosion Results Analysismentioning

confidence: 90%

Influence of process parameters on the mechanical properties and corrosion resistance of dissimilar friction stir welded joints of AA2024-O and AA6061-O aluminum alloys

Soto-Diaz¹,

Sandoval-Amador²,

Escorcia‐Gutierrez³

et al. 2023

Preprint

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xIn this study, the influence of the process parameters, traverse and rotational speeds, of dissimilar friction stir welded joints of AA2024-O and AA6061-O aluminum alloys on the corrosion resistance was evaluated. Potentiodynamic tests using a 3.5% NaCl solution obtained open circuit potential curves and polarization curves showing the corrosion behavior for the different welding parameters. These data were correlated with those obtained by mechanical tests (microhardness, tensile, and fracture analysis) and microstructure analysis by optical microscopy and scanning electron microscopy. It was observed that the combined effect of the parameters influenced the variation of corrosion resistance. This was mainly evidenced by the improvement in corrosion resistance at 1200rpm − 65mm · min−1 which was related to the recrystallization of the grain size and the heat input presented. Corrosive attacks on the welded joints showed greater affectations in the presence of base material 1 (AA6061-O) with greater metallic dissolution. The attacks mentioned above were presented in different forms, such as pitting, localized, and selective, and were observed by scanning electron microscopy. Finally, in corrosive and mechanical terms, the best performing condition was 1200rpm − 65mm · min−1 compared to the low parameter 840rpm − 45mm · min−1 .

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Section: Corrosion Results Analysismentioning

confidence: 90%

Influence of process parameters on the mechanical properties and corrosion resistance of dissimilar friction stir welded joints of AA2024-O and AA6061-O aluminum alloys

Soto-Diaz¹,

Sandoval-Amador²,

Escorcia‐Gutierrez³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The results of the Tafel analyses are summarized in Table 6. AA6061-O alloy displayed a corrosion potential of −741 mV compared to −659 mV of AA2024-O alloy [74,75]. The welded joint with HH conditions presented a similar behavior to AA6061-O alloy; it was due to Mg content, which generates a passivating effect, enhanced by the tendency to refinement of grain size in the stir region [72], obtaining a low corrosion rate.…”

Section: Corrosion Results Analysismentioning

confidence: 91%

Influence of Process Parameters on the Mechanical Properties and Corrosion Resistance of Dissimilar Friction Stir Welded Joints of AA2024-O and AA6061-O Aluminum Alloys

Soto-Diaz,

Sandoval-Amador,

Escorcia-Gutierrez

et al. 2024

Metals

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The influence of the process parameters, traverse, and rotational speeds of dissimilar friction stir welded joints of AA2024-O and AA6061-O aluminum alloys on the corrosion resistance was evaluated. Potentiodynamic tests using a 3.5% NaCl solution, open circuit potential, and polarization curves showed the corrosion behavior for the different welding parameters. These data were correlated with those obtained by mechanical tests (microhardness, tensile, and fracture analysis) and microstructure analysis by optical and scanning electron microscopy. It was observed that the combined effect of the parameters influenced the variation of corrosion resistance. This was evidenced mainly by the improvement of corrosion resistance at 1200 rpm–65 mm·min−1, which was related to the tendency of grain size and heat input presented. The corrosive attacks on the welded joints presented greater affectations in the presence of base material 1 (AA6061-O) with higher metallic dissolution. Corrosion attacks abovementioned were presented in different forms, such as pitting, localized, and selective, and they were observed by scanning electron microscopy. Finally, in corrosive and mechanical terms, the best performing condition was 1200 rpm and 65 mm·min−1 compared to the low parameter of 840 rpm and 45 mm·min−1.

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“…This can be attributed to the precipitation of fine sub microscopic particles during natural ageing. Active sites for the pit initiation get reduced due to the dissolution of secondary intermetallic precipitation [12]. Sunitha et al reported that Al6065/SiC/graphite hybrid composites show a good corrosion resistance behaviour if the graphite percentage of the composite is low [13].…”

Section: Introductionmentioning

confidence: 99%

An Investigation of corrosion of friction welded and post-weld heat-treated AA6061/SiC/graphite hybrid composites

Senthilkumar

Kumar²,

Balasubramanian³

2021

Acta Polytech

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The aluminium-based hybrid metal matrix composites have noteworthy applications in sub-sea installations, structures of deep-sea crawlers, submarine parts, engine cylinders, drum brakes etc., as they possess high strength, corrosion resistance, chemical, and dimensional stability. In this investigation, the pitting corrosion behaviour of friction welded and post-weld heat-treated AA6061/SiC/graphite hybrid composites were analysed. The corrosion rates of AW (as welded), ST (Solution treated), STA (Solution treated and Aged), and AA (Artificially Aged) weld joints were experimentally determined. The corrosion behaviour has been discussed in light of microstructure. The experimental results revealed that the STA joints exhibited better corrosion resistance characteristics as compared to AW, AA, and ST joints. The corrosion rate was high for AW joints, followed by AA and ST joints, respectively. Taking into account the corrosion rates of AW and STA joints, the STA joints have a corrosion rate 34.6% lesser than that of AW joints. A comparison of AA and ST with STA joints reveals that the rate of corrosion for STA joints was 31.1% lesser than that of AA joints and 28.8% lesser than that of ST joints. A lower corrosion rate was observed for STA joints as compared to AA, AW, and ST joints.

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Influence of Post Weld Heat Treatment on Microstructure and Pitting Corrosion Behavior of Dissimilar Aluminium Alloy Friction Stir Welds

Cited by 9 publications

References 9 publications

Influence of process parameters on the mechanical properties and corrosion resistance of dissimilar friction stir welded joints of AA2024-O and AA6061-O aluminum alloys

Influence of process parameters on the mechanical properties and corrosion resistance of dissimilar friction stir welded joints of AA2024-O and AA6061-O aluminum alloys

Influence of Process Parameters on the Mechanical Properties and Corrosion Resistance of Dissimilar Friction Stir Welded Joints of AA2024-O and AA6061-O Aluminum Alloys

An Investigation of corrosion of friction welded and post-weld heat-treated AA6061/SiC/graphite hybrid composites

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