The effect of copper addition on the corrosion resistance of cast duplex stainless steel

In this study, the effects of the addition of 3.01% Cu on the corrosion behaviour of cast duplex stainless steel aged for 1h at different temperatures between 450 and 600°C was investigated by electrochemical tests in 0.6M NaCl, 0.3M H2SO4 and 0.6M NaCl+0.3M H2SO4. A short ageing time increases the...

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Bibliographic Details
Published in:Journal of materials research and technology 2019-04, Vol.8 (2), p.2107-2119
Main Authors: Lima, Hillane Mirelle Lopes Ferreira de, Tavares, Sérgio Souto Maior, Martins, Marcelo, Araújo, Walney Silva
Format: Article
Language:English
Subjects:
Cast duplex stainless steel
Copper
Passive film
Pitting corrosion
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Summary:In this study, the effects of the addition of 3.01% Cu on the corrosion behaviour of cast duplex stainless steel aged for 1h at different temperatures between 450 and 600°C was investigated by electrochemical tests in 0.6M NaCl, 0.3M H2SO4 and 0.6M NaCl+0.3M H2SO4. A short ageing time increases the hardness and mechanical resistance of the Cu-containing steel by precipitation hardening. Potentiodynamic polarization and electrochemical impedance spectroscopy results show that the effect of Cu addition depends on the media studied. In addition, critical pitting temperature (CPT) measurements revealed that steel with 3.01% Cu has a lower pitting corrosion resistance. On the other hand, for both steels, the short time ageing caused a slight increase in CPT values.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2019.01.018