Corrosion Behavior of Fe-35Ni-22Cr and Fe-17Ni-17Cr Alloys in Acid Pickling Solutions

Document Type : Original Article

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Faculty of science, chemistry department, Al Azhar University

Abstract

This work aims to study the corrosion behavior of two alloys Fe-35Ni-22Cr and Fe-17Ni-17Cr in acid pickling solutions. The corrosion behavior of two alloys in HCl and H2SO4 was studied using the weight-loss method and potentiodynamic polarization, at a different time at 30 °C, 40 °C and 60 °C. The morphology of two alloys was analyzed by scanning electron microscope (SEM) and energy dispersive X-ray (EDS) analysis. The effect of temperature at constant acid concentration solutions has a strong influence on the corrosion rate of two alloys Fe-35Ni-22Cr and Fe-17Ni-17Cr. The activation energy (πΈπ‘Ž), enthalpy (βˆ†π»), entropy (βˆ†π‘†) and free energy (βˆ†πΊ) were calculated and discussed. Results obtained from weight loss and potentiodynamic measurements were in good agreement and confirmed that Fe-35Ni-22Cr alloy is a higher corrosion resistance than Fe-17Ni-17Cr alloy in HCl and H2SO4 acid solutions.

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History

  • Receive Date: 06 January 2020
  • Revise Date: 03 March 2020
  • Accept Date: 10 March 2020

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