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Arabian Journal for Science and Engineering

, Volume 43, Issue 9, pp 4871–4878 | Cite as

Corrosion Behavior of ECAP-Processed AM90 Magnesium Alloy

  • K. R. Gopi
  • H. Shivananda Nayaka
  • Sandeep Sahu
Research Article - Mechanical Engineering
  • 49 Downloads

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.

Keywords

Equal-channel angular pressing Magnesium Microstructure Grain refinement Corrosion resistance 

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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  • K. R. Gopi
    • 1
  • H. Shivananda Nayaka
    • 1
  • Sandeep Sahu
    • 2
  1. 1.Department of Mechanical EngineeringNational Institute of Technology KarnatakaSurathkalIndia
  2. 2.Department of Materials Science and EngineeringIndian Institute of Technology KanpurKanpurIndia

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