Journal
CORROSION SCIENCE
Volume 58, Issue -, Pages 321-326Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2012.01.007
Keywords
Magnesium; Polarization; Weight loss; SEM
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Effect of grain refinement and heat treatment on corrosion behavior of a friction stir processed Mg-Y-RE alloy was studied. The ennoblement of pitting potential by similar to 250 mV vs. SCE of processed samples as compared to parent alloy was attributed to grain refinement and uniform second phase distribution as a result of friction stir processing. Lower currents and positive open circuit potentials were observed in friction stir processed samples under free corroding conditions. Friction stir processing prior to peak hardening resulted in improved pitting potential when compared to the peak aged and processed samples. Electrochemical testing and constant immersion testing showed differing trends. (c) 2012 Elsevier Ltd. All rights reserved.
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