Journal
SURFACE & COATINGS TECHNOLOGY
Volume 413, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2021.127095
Keywords
Super duplex stainless steel (SDSS); Low temperature plasma nitriding (LTPN); Pitting corrosion; Crevice corrosion
Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico - Brazil (CNPq) [PQ 311685/2018-8]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brazil (CAPES) [001]
- Fundacao Araucaria (PRONEX Project)
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Nitriding treatment on UNS 532750 super duplex stainless steel improved hardness, general corrosion resistance, passive layer breakdown potential, and crevice corrosion resistance. Nitrogen played a crucial role in the passivation behavior and susceptibility to repassivation of localized corrosion.
The UNS 532750 super duplex stainless steel (SDSS) was low temperature plasma nitrided at 350 degrees C and 400 degrees C for 4 h. Pitting and crevice corrosion resistance was evaluated using electrochemical techniques in a NaCl neutral solution. Nitriding treatments resulted in increased in hardness, general corrosion resistance and in the passive layer breakdown potential. Regarding crevice corrosion tests, the nitrided surfaces showed lower current densities during the potentiostatic polarization and lower corrosion depths when compared to the untreated surface. The nitrogen played a fundamental role in the passivation behavior and in the susceptibility to repassivation of localized corrosion.
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