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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
Cite this article as:
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

  • 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.
    • Research Article

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

    + Author Affiliations
      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.
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