Please use this identifier to cite or link to this item: http://www.repositorio.ufc.br/handle/riufc/59297
Title in Portuguese: Corrosion resistance of cu-alloyed precipitation hardenable duplex stainless steel ASTM A890 Grade 1B
Author: Lima, Hillane Mirelle Lopes Ferreira de
Tavares, Sérgio Souto Maior
Bastos, Ivan Napoleão
Rodrigues, Matheus Souza
Martins, Marcelo
Araújo, Walney Silva
Keywords: Cast duplex stainless steel
Copper
Passive film
Issue Date: 2019
Citation: LIMA, Hillane Mirelle Lopes Ferreira de; TAVARES, Sérgio Souto Maior; BASTOS, Ivan Napoleão; RODRIGUES, Matheus Souza; MARTINS, Marcelo; ARAÚJO, Walney Silva. Corrosion resistance of cu-alloyed precipitation hardenable duplex stainless steel ASTM A890 Grade 1B. Revista Materia, Rio de Janeiro, v. 22, n.1, 2019.
Abstract: Duplex stainless steels (DSS) are corrosion resistant alloys largely used in chemical and petrochemical industries. Some commercial DSS contain 0.5-1.0% copper addition to improve the corrosion resistance by reducing the corrosion rate in non-oxidizing environments. Higher copper addition (≥ 2%) can also hard by precipitation, especially when fine copper precipitates (ε phase) are produced. In this work, a cast copper alloyed DSS type ASTM A890 grade 1B with 3.01%Cu was investigated. Different levels of hardness were produced by solution treatment and aging at 450, 500, 550 and 600 oC for periods of time up to 1 hour. The corrosion resistance of aged DSS was evaluated by electrochemical tests in three media: 0.6 mol/L NaCl, 0.3 mol/L H2SO4 and 0.6 mol/L NaCl + 0.3 mol/L H2SO4 solutions. The results indicate that the effect of Cu addition depends on the media studied. Polarization studies in 0.6 mol/L NaCl showed a small anodic current peak occurred at around 400 mV vs. Ag/AgCl, with a strong influence on the passive film stability. Additionally, chronoamperometric measurements at 400 mV vs. Ag/AgCl showed a high electrochemical activity for the samples in 0.6 mol/L NaCl.
URI: http://www.repositorio.ufc.br/handle/riufc/59297
metadata.dc.type: Artigo de Periódico
ISSN: 2359-1900
Appears in Collections:DEMM - Artigos publicados em revista científica

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