Metals (Jun 2022)

Corrosion Behavior of Passivated Martensitic and Semi-Austenitic Precipitation Hardening Stainless Steel

  • Facundo Almeraya-Calderón,
  • Oliver Samaniego-Gámez,
  • Erick Maldonado-Bandala,
  • Demetrio Nieves-Mendoza,
  • Javier Olguín-Coca,
  • Jesús Manuel Jáquez-Muñoz,
  • José Cabral-Miramontes,
  • Juan Pablo Flores-De los Rios,
  • Raul German Bautista-Margulis,
  • Citlalli Gaona-Tiburcio

DOI
https://doi.org/10.3390/met12061033
Journal volume & issue
Vol. 12, no. 6
p. 1033

Abstract

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This research aimed to conduct a passive layer state study on martensitic and semi-austenitic precipitation hardening stainless steels (PHSS) passivated in citric acid and nitric acid baths at 49 and 70 °C for 50 and 75 min and subsequently exposed in 5 wt.% NaCl and 1 wt.% H2SO4 solutions. Corrosion behavior of the passivated material was observed by using potentiodynamic polarization (PP) according to the ASTM G5-11 standard. The microstructural analysis was performed by optical microscopy and scanning electron microscopy (SEM), while the passivated layer was characterized by X-ray photoelectron spectroscopy (XPS). The results indicated that the semi-austenitic-NA-50 min-70 °C sample showed the best corrosion resistance behavior in both solutions. The XPS characterization confirmed that the martensitic and semi-austenitic surface film presented a mixture of chemical compounds, such as Cr2O3 and Fe(OH)O, respectively.

Keywords