Journal
SURFACE & COATINGS TECHNOLOGY
Volume 204, Issue 20, Pages 3280-3286Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2010.03.036
Keywords
Plasma nitriding; PH stainless steel; Martensitic stainless steel; Corrosion resistance
Funding
- National University of Technology [PID 25D/031]
- IONAR S.A (Buenos Aires)
- National University of Mar del Plata
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Plasma nitriding is a well established technology to improve wear and corrosion properties of austenitic stainless steels. Nevertheless, in the case of martensitic stainless steels, it continues being a problem mainly from the corrosion resistance viewpoint. In this work, three high chromium stainless steels (M340, N695 and Corrax) were hardened by ion nitriding at low temperature, intending to preserve their corrosion resistance. Corrosion behavior was evaluated by CuSO4 spot, salt spray fog and potentiodynamic polarization in NaCl solution. Microstructure was analyzed by optical microscopy, SEM (EDS) and glancing angle X-ray diffraction. All the samples showed an acceptable corrosion resistance in experiments with CuSO4, but in salt spray fog and electrochemical tests, only Corrax showed good behavior. The poor corrosion performance could be explained by chromium carbides formed in thermal treatment stage in martensitic steels and chromium nitrides formed during nitriding, even though the process was carried out at low temperature. (C) 2010 Elsevier B.V. All rights reserved.
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