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Title: | Corrosion Behavior of ECAP-Processed AM90 Magnesium Alloy |
Authors: | Gopi, K.R. Nayaka, H.S. Sahu, S. |
Issue Date: | 2018 |
Citation: | Arabian Journal for Science and Engineering, 2018, Vol.43, 9, pp.4871-4878 |
Abstract: | Magnesium AM90 alloy was subjected to equal-channel angular pressing (ECAP) using route B C. Microstructural characterization revealed refined grains having average grain size ?3?m after ECAP 4 passes. Samples were subjected to electrochemical measurements to study the corrosion behavior. Potentiodynamic polarization test showed reduced corrosion current density (Icorr) for processed samples up to ECAP 3 pass due to grain refinement. Electrochemical impedance spectroscopy showed an increase in the diameter of the capacitive arcs and charge-transfer resistance (Rt) for ECAP-processed 3 pass sample indicating the reduction in corrosion rate. Increase in corrosion resistance is due to refined microstructure and uniform distribution of secondary particles forming a protective passivation layer (Mg (OH) 2) on the sample s surface. Immersion test indicated lower hydrogen evolution from ECAP-processed samples compared to the unprocessed condition indicating decreased corrosion rate. 2018, King Fahd University of Petroleum & Minerals. |
URI: | http://idr.nitk.ac.in/jspui/handle/123456789/10415 |
Appears in Collections: | 1. Journal Articles |
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