Finite Modeling and Simulation of the Effects of Neutral Electrolytic Pickling Process Parameters on EN 1.4404 Steel Strips

dc.contributorAalto Universityen
dc.contributor.authorAji, Arif Tirtoen_US
dc.contributor.authorAromaa, Jarien_US
dc.contributor.authorTuovinen, Teemuen_US
dc.contributor.authorRiekki, Elinaen_US
dc.contributor.authorLundström, Marien_US
dc.contributor.departmentDepartment of Chemical and Metallurgical Engineeringen
dc.contributor.groupauthorHydrometallurgy and Corrosionen
dc.contributor.organizationUniversity of Ouluen_US
dc.contributor.organizationOutokumpu Stainless Oyen_US
dc.descriptionFunding Information: This research was conducted with the funding from the TOCANEM project financed by Business Finland (grant number 41778/31/2020). The authors gratefully acknowledge the support of the School of Chemical Engineering at Aalto University as well as the RawMatters Finland Infrastructure (RAMI), funded by the Academy of Finland. Publisher Copyright: © 2023 by the authors.
dc.description.abstractSurface treatment via neutral electrolytic pickling (NEP) aims to remove oxide layers and scaling from stainless steel. The objective of this study was to investigate the factors that affect the energy efficiency of the process. This study developed a COMSOL Multiphysics model for the distribution of current across a bipolar steel strip by controlling the following parameters: Na2SO4 concentration, temperature, electrode-to-strip distance, and inter-electrode distance. Full factorial measurements of the electrolyte’s conductivity as well as the steel strip’s and the electrode’s polarization were conducted to provide data for the NEP model. Galvanostatic pulse measurements were performed to calculate transient times during pickling. According to the model, an applied voltage of less than 11 V was insufficient to polarize the steel strip to the potentials needed on both the anodic and cathodic sides. A higher voltage of 11–15 V resulted in anodic current densities of 600–1600 A m−2 and cathodic current densities of 700–2000 A m−2 on the steel strip. These current densities are within the range of previous experimental studies and industrial practices. The model showed that when a steel strip acts as a bipolar electrode, the current’s efficiency decreases, as only a fraction of the strip facing the anodes or cathodes is polarized sufficiently. The galvanostatic tests showed that anodic polarization of the steel strip is easier than cathodic polarization. The slow polarization in the cathodic direction can be improved by using a higher current density. The time needed to polarize stainless steel indicates that the strip’s velocity should be less than 1 m s−1 to give enough time for polarizing the steel strip.en
dc.description.versionPeer revieweden
dc.identifier.citationAji, A T, Aromaa, J, Tuovinen, T, Riekki, E & Lundström, M 2023, ' Finite Modeling and Simulation of the Effects of Neutral Electrolytic Pickling Process Parameters on EN 1.4404 Steel Strips ', Metals, vol. 13, no. 12, 2001 .
dc.identifier.otherPURE UUID: 6d0b0371-521c-41fd-9b64-f9def3d1ee16en_US
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dc.publisherMDPI AG
dc.relation.ispartofseriesVolume 13, issue 12en
dc.subject.keywordfinite modelingen_US
dc.subject.keywordneutral electrolytic picklingen_US
dc.subject.keywordstainless steelen_US
dc.titleFinite Modeling and Simulation of the Effects of Neutral Electrolytic Pickling Process Parameters on EN 1.4404 Steel Stripsen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi