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Microstructure and corrosion behaviour of pulsed plasma-nitrided AISI H13 tool steel |
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| Authors: | Rodrigo LO Basso Vanessa Schmidt Silvia AC Abarca Almir Spinelli Cristiano Giacomelli |
| Affiliation: | a Centro de Ciências Exatas e Tecnologia, Universidade de Caxias do Sul, 95070-560 Caxias do Sul, RS, Brazil b Instituto de Química, Universidade Estadual de Campinas, 13084-862 Campinas, SP, Brazil c Instituto de Física, Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, RS, Brazil d Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil |
| Abstract: | The effect of pulsed plasma nitriding temperature and time on the pitting corrosion behaviour of AISI H13 tool steel in 0.9% NaCl solutions was investigated by cyclic polarization. The pitting potential (Epit) was found to be dependent on the composition, microstructure and morphology of the surface layers, whose properties were determined by X-ray diffraction and scanning electron microscopy techniques. The best corrosion protection was observed for samples nitrided at 480 °C and 520 °C. Under such experimental conditions the Epit-values shifted up to 1.25 V in the positive direction. |
| Keywords: | A Steel B Polarization B XRD B SEM C Pitting corrosion |
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