Krishna, K Gopala and Sivaprasad, S and Sankara Narayanan, T S N and Kumar, K C Hari (2012) Localized corrosion of an ultrafine grained Al-4Zn-2Mg alloy produced by cryorolling. Corrosion Science, 60 . pp. 82-89.
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The effect of microstructure on corrosion behaviour of an ultrafine grained (UFG) Al-4Zn-2Mg alloy produced by cryorolling was investigated. Both UFG and coarse grained (CG) alloys in peak-aged condition were subjected to potentiodynamic polarization and intergranular corrosion (IGC) tests in chloride solutions. UFG alloy exhibited increased corrosion potential (E-corr), decreased corrosion current density (i(corr)) (-864 mV(SCE), 0.60 mu A/cm(2)) during polarization and lower weight loss during IGC when compared with CG alloy (-902 mV(SCE), 4.9 mu A/cm(2)). Improved corrosion resistance of UFG alloy is mainly attributed to sub-micrometer grains, absence of coarse MgZn2 anodic precipitates and precipitate-free zones along the grain boundaries. (c) 2012 Elsevier Ltd. All rights reserved.
|Uncontrolled Keywords:||Aluminium; Intermetallics; Polarization; TEM; Pitting corrosion; Intergranular corrosion|
|Divisions:||Material Science and Technology|
|Deposited By:||Dr. A K Sahu|
|Deposited On:||28 Aug 2012 12:45|
|Last Modified:||28 Aug 2012 12:45|
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