Properties of Passive Films Formed on Ferrite-Martensite and Ferrite-Pearlite Steel Microstructures

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Abstract

The effect of ferrite-pearlite and ferrite-martensite phase combinations on the passive layer properties of low carbon steel is investigated in a 0.1 M NaOH solution. Heat treatments were designed to obtain ferrite-pearlite and ferrite-martensite microstructures with similar ferrite volume fractions. Potentiostatic polarisation and electrochemical impedance spectroscopy (EIS) results demonstrated the lower barrier properties of passive films on ferrite-martensite microstructure compared to the ones formed on ferrite-pearlite microstructure. This was attributed to the higher donor density of the passive layer on ferrite-martensite samples, measured with Mott–Schottky analysis. This behaviour was explained by the complex microstructure morphology of the martensite phase that led to the formation of a more defective passive film
Original languageEnglish
Article number594
Number of pages11
JournalMetals
Volume11
Issue number4
DOIs
Publication statusPublished - 2021

Keywords

  • HSLA steel
  • dual-phase
  • passivity
  • EIS
  • polarisation
  • Mott–Schottky

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