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Núñez, Yamid; Mafra, Marcio; Morales, Rigoberto E.; Borges, Paulo César; Pintaude, Giuseppe

The effect of plasma nitriding on the synergism between wear and corrosion of SAF 2205 duplex stainless steel

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  • Medientyp: E-Artikel
  • Titel: The effect of plasma nitriding on the synergism between wear and corrosion of SAF 2205 duplex stainless steel
  • Beteiligte: Núñez, Yamid; Mafra, Marcio; Morales, Rigoberto E.; Borges, Paulo César; Pintaude, Giuseppe
  • Erschienen: Emerald, 2020
  • Erschienen in: Industrial Lubrication and Tribology
  • Sprache: Englisch
  • DOI: 10.1108/ilt-08-2019-0302
  • ISSN: 0036-8792
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:sec> <jats:title content-type="abstract-subheading">Purpose</jats:title> <jats:p>This study aims to assess the performance of SAF 2205 duplex stainless steel against pure wear, tribo-corrosion, corrosion and the synergism between wear and corrosion. The effect of plasma nitriding conducted at low temperature (380°C) on SAF 2205 steel was analyzed.</jats:p> </jats:sec> <jats:sec> <jats:title content-type="abstract-subheading">Design/methodology/approach</jats:title> <jats:p>Three systems were used for assessing the synergism between wear and corrosion: tribo-corrosion – wear tests conducted using the micro-scale abrasion test, performed under a slurry of alumina particles containing 3.5% NaCl; pure wear – tests conducted using the previous system but isolated in a glovebox with a 99% N2 atmosphere; and cyclic polarization under 3.5% NaCl solution. A hard nitrided layer of 3 µm thickness was characterized using X-ray diffraction, presenting expanded austenite.</jats:p> </jats:sec> <jats:sec> <jats:title content-type="abstract-subheading">Findings</jats:title> <jats:p>The wear mode after micro-scale abrasion tests changed in the absence of an oxygen atmosphere. During pure wear, a mixed mode was identified (rolling + grooving), with the grooving mode more intense for the untreated steel. For tribo-corrosion tests, only rolling wear was identified. For all cases, the nitrided samples presented less wear. The corrosion results indicated a higher repassivation potential for the nitrided condition.</jats:p> </jats:sec> <jats:sec> <jats:title content-type="abstract-subheading">Practical implications</jats:title> <jats:p>The synergism was more positive for the nitrided sample than for the untreated one, which can be considered for surface treatments of duplex stainless steels in practical applications.</jats:p> </jats:sec> <jats:sec> <jats:title content-type="abstract-subheading">Originality/value</jats:title> <jats:p>A detailed description of wear mechanisms showed a significant change in the presence of oxygen atmosphere, a new approach for isolating pure wear.</jats:p> </jats:sec>