Corrosion behavior of ultrafine-grained AA2024 aluminum alloy produced by cryorolling

P. Laxman Mani Kanta; V. C. Srivastava; K. Venkateswarlu; Sharma Paswan; B. Mahato; Goutam Das; K. Sivaprasad; K. Gopala Krishna

doi:10.1007/s12613-017-1522-2

Volume 24 Issue 11

Nov. 2017

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文章导航 > 矿物冶金与材料学报（英文） > 2017 > 24(11): 1293-1305

P. Laxman Mani Kanta, V. C. Srivastava, K. Venkateswarlu, Sharma Paswan, B. Mahato, Goutam Das, K. Sivaprasad, and K. Gopala Krishna, Corrosion behavior of ultrafine-grained AA2024 aluminum alloy produced by cryorolling, Int. J. Miner. Metall. Mater., 24(2017), No. 11, pp. 1293-1305. https://doi.org/10.1007/s12613-017-1522-2

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P. Laxman Mani Kanta, V. C. Srivastava, K. Venkateswarlu, Sharma Paswan, B. Mahato, Goutam Das, K. Sivaprasad, and K. Gopala Krishna, Corrosion behavior of ultrafine-grained AA2024 aluminum alloy produced by cryorolling, Int. J. Miner. Metall. Mater., 24(2017), No. 11, pp. 1293-1305. https://doi.org/10.1007/s12613-017-1522-2

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研究论文

Corrosion behavior of ultrafine-grained AA2024 aluminum alloy produced by cryorolling

Department of Metallurgical & Materials Engineering, National Institute of Technology, Thiruchirappalli 620015, India
National Metallurgical Laboratory, Council of Scientific & Industrial Research, Jamshedpur 831007, India
National Aerospace Laboratories, Council of Scientific & Industrial Research, Bangalore 560017, India

通讯作者:
K. Gopala Krishna E-mail: kgk@nmlindia.org

中文摘要

The objectives of this study were to produce ultrafine-grained (UFG) AA2024 aluminum alloy by cryorolling followed by aging and to evaluate its corrosion behavior. Solutionized samples were cryorolled to ~85% reduction in thickness. Subsequent aging resulted in a UFG structure with finer precipitates of Al₂CuMg in the cryorolled alloy. The (1) solutionized and (2) solutionized and cryorolled samples were uniformly aged at 160℃/24 h and were designated as CGPA and CRPA, respectively; these samples were subsequently subjected to corrosion studies. Potentiodynamic polarization studies in 3.5wt% NaCl solution indicated an increase in corrosion potential and a decrease in corrosion current density for CRPA compared to CGPA. In the case of CRPA, electrochemical impedance spectroscopic studies indicated the presence of two complex passive oxide layers with a higher charge transfer resistance and lower mass loss during intergranular corrosion tests. The improved corrosion resistance of CRPA was mainly attributed to its UFG structure, uniform distribution of fine precipitates, and absence of coarse grain-boundary precipitation and associated precipitate-free zones as compared with the CGPA alloy.

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Research Article

Corrosion behavior of ultrafine-grained AA2024 aluminum alloy produced by cryorolling

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Abstract

Abstract

The objectives of this study were to produce ultrafine-grained (UFG) AA2024 aluminum alloy by cryorolling followed by aging and to evaluate its corrosion behavior. Solutionized samples were cryorolled to ~85% reduction in thickness. Subsequent aging resulted in a UFG structure with finer precipitates of Al₂CuMg in the cryorolled alloy. The (1) solutionized and (2) solutionized and cryorolled samples were uniformly aged at 160℃/24 h and were designated as CGPA and CRPA, respectively; these samples were subsequently subjected to corrosion studies. Potentiodynamic polarization studies in 3.5wt% NaCl solution indicated an increase in corrosion potential and a decrease in corrosion current density for CRPA compared to CGPA. In the case of CRPA, electrochemical impedance spectroscopic studies indicated the presence of two complex passive oxide layers with a higher charge transfer resistance and lower mass loss during intergranular corrosion tests. The improved corrosion resistance of CRPA was mainly attributed to its UFG structure, uniform distribution of fine precipitates, and absence of coarse grain-boundary precipitation and associated precipitate-free zones as compared with the CGPA alloy.
- AA2024 alloy;
- cryorolling;
- ultrafine grains;
- precipitation;
- corrosion behavior

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References

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Corrosion behavior of ultrafine-grained AA2024 aluminum alloy produced by cryorolling

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Corrosion behavior of ultrafine-grained AA2024 aluminum alloy produced by cryorolling

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