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

Kanta, P Laxman Mani and Srivastava, V C and Venkateswarlu, K and Paswan, S and Mahato, B and Das, Goutam and Sivaprasad, K and Krishna, K Gopala (2017) Corrosion behavior of ultrafine-grained AA2024 aluminum alloy produced by cryorolling. International Journal of Minerals, Metallurgy, and Materials, 24(11) (IF- 0.943). pp. 1293-1305.

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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°C/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.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:AA2024 alloy,cryorolling ,ultrafine grains,precipitation ,corrosion behavior
Divisions:Corrosion and Surface Engineering
ID Code:7757
Deposited By:Sahu A K
Deposited On:16 Feb 2018 11:11
Last Modified:16 Feb 2018 11:12
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