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The beneficial effect of ruthenium additions on the passivation of duplex stainless steel corrosion in sodium chloride solutions |
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| Authors: | El-Sayed M Sherif JH Potgieter L Cornish CN Machio |
| Affiliation: | a DST/NRF Centre of Excellence in Strong Materials, School of Physics, University of the Witwatersrand, Johannesburg, Wits 2050, South Africa b Chemistry and Materials Division, School of Biology, Chemistry and Health Sciences, Manchester Metropolitan University, Oxford Road, Manchester M1 5GD, UK c DST/NRF Centre of Excellence in Strong Materials, School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg, Wits 2050, South Africa d Center of Excellence for Research in Engineering Materials (CEREM), College of Engineering, King Saud University, P. O. Box 800, Al-Riyadh 11421, Saudi Arabia |
| Abstract: | The effect of varying ruthenium contents of 0.00, 0.14, 0.22, and 0.28% on the corrosion of 22%Cr-9%Ni-3%Mo duplex stainless steel (DSS) after different immersion intervals in 3.5% NaCl solutions has been investigated. The study was carried out using open-circuit potential, potentiodynamic cyclic polarization, chronoamperometry, electrochemical impedance spectroscopy, and weight-loss measurements. Particular attention was paid to the effect of Ru on the pitting corrosion of DSS in the chloride solutions. Electrochemical measurements indicated that the presence of Ru passivates the DSS alloy by decreasing its corrosion parameters. Furthermore, it shifts the corrosion and pitting potentials to more positive values. This effect was found to increase with increasing Ru content and also with increased immersion time of the alloy in the chloride solution before measurements. Weight-loss time data after varied exposure periods (4-20 days) showed that the weight-loss and corrosion rate of DSS significantly decrease with increasing Ru contents. |
| Keywords: | B EIS C Passive films Corrosion protection Duplex stainless steel Salt water |
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