INTEMA 05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
Corrosion behavior of martensitic and precipitation hardening stainless steels treated by plasma nitriding
Autor/es:
SONIA P. BRÜHL; RAÚL CHARADIA; SILVIA SIMISON; DIEGO G. LAMAS; AMADO CABO
Revista:
SURFACE AND COATINGS TECHNOLOGY
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Año: 2010
ISSN:
0257-8972
Resumen:
Plasma nitriding is a well established technology to improve wear and corrosion properties of austeniticstainless steels. Nevertheless, in the case of martensitic stainless steels, it continues being a problem mainlyfrom the corrosion resistance viewpoint.In this work, three high chromium stainless steels (M340, N695 and Corrax) were hardened by ion nitridingat low temperature, intending to preserve their corrosion resistance.Corrosion behavior was evaluated by CuSO4 spot, salt spray fog and potentiodynamic polarization in NaClsolution. Microstructure was analyzed by optical microscopy, SEM (EDS) and glancing angle X-raydiffraction. All the samples showed an acceptable corrosion resistance in experiments with CuSO4, but in saltspray fog and electrochemical tests, only Corrax showed good behavior. The poor corrosion performancecould be explained by chromium carbides formed in thermal treatment stage in martensitic steels andchromium nitrides formed during nitriding, even though the process was carried out at low temperature
