EIS and adjunct electrical modeling for material selection by evaluating two mild steels for use in super-alkaline mineral processing

Leila Bakhtiyari, Fereshteh Moghimi, Seyed Soheil Mansouri, Ali Farsi, Masoud M. Malek-Shah

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The production of metal concentrates during mineral processing of ferrous and non-ferrous metals involves a variety of highly corrosive chemicals which deteriorate common mild steel as the material of choice in the construction of such lines, through rapid propagation of localized pitting in susceptible parts, often in sensitive areas. This requires unscheduled maintenance and plant shut down. In order to test the corrosion resistance of different available materials as replacement materials, polarization and electrochemical impedance spectroscopy (EIS) tests were carried out. The EIS numerical outputs were then transformed into an equivalent electric circuit using Z-View software, and the predictive behavior was contrasted with actual performance after long-term immersion, depicted through SEM, EDS, XRD and weight change observations. Also, results of pits and cracks, obtained with climax software-enhanced polarization resistance, and reduced capacitance added to much diminished current densities, verified the acceptable performance of CK45 compared with high priced stainless steel substitutes with comparable operational life. Therefore, CK45 can be a suitable alternative in steel constructions which are exposed to super-alkaline and corrosive environments.
Original languageEnglish
JournalResearch on Chemical Intermediates
Volume38
Issue number3-5
Pages (from-to)965-982
ISSN0922-6168
DOIs
Publication statusPublished - 2012

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