Abstract
Magnesium AM90 alloy was subjected to equal-channel angular pressing (ECAP) using route $$\hbox {B}_{\mathrm{C}}$$ . Microstructural characterization revealed refined grains having average grain size $$\sim \,3\,\upmu \hbox {m}$$ after ECAP 4 passes. Samples were subjected to electrochemical measurements to study the corrosion behavior. Potentiodynamic polarization test showed reduced corrosion current density $$(I_{\mathrm{corr}})$$ 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 $$(R_{\mathrm{t}})$$ 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 $$(\hbox {Mg}(\hbox {OH})_{2})$$ on the sample’s surface. Immersion test indicated lower hydrogen evolution from ECAP-processed samples compared to the unprocessed condition indicating decreased corrosion rate.
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