Effects of electrolyte parameters on the iron/steel cathode potential in the chlorate process
2009 (English)In: Journal of Applied Electrochemistry, ISSN 0021-891X, E-ISSN 1572-8838, Vol. 39, no 1, 71-81 p.Article in journal (Refereed) Published
This study focuses on how different electrolyte parameters of the chlorate process affect the cathode potential for hydrogen evolution on iron in a wide current-density range. The varied parameters were pH, temperature, mass transport conditions and the ionic concentrations of chloride, chlorate, chromate and hypochlorite. At lower current densities, where cathodic protection of the electrode material is important, the pH buffering capacity of the electrolyte influenced the potential to a large extent. It could be concluded that none of the electrolyte parameters had any major effects (< 50 mV) on the chlorate-cathode potential at industrially relevant current densities (around 3 kA m(-2)). Certainly, there is more voltage to gain from changing the cathode material than from modifying the electrolyte composition. This is exemplified by experiments on steel corroded from operation in a chlorate plant, which exhibits significantly higher activity for hydrogen evolution than polished steel or iron.
Place, publisher, year, edition, pages
2009. Vol. 39, no 1, 71-81 p.
Chlorate cathode, Chlorate process, Hydrogen evolution, Iron, Steel
IdentifiersURN: urn:nbn:se:kth:diva-8149DOI: 10.1007/s10800-008-9642-zISI: 000268729700010ScopusID: 2-s2.0-58149503301OAI: oai:DiVA.org:kth-8149DiVA: diva2:13395
QC 20100901. Uppdaterad från submitted till published (20100901). Tidigare titel: Effects of electrolyte parameters on the chlorate cathode potential2008-03-272008-03-272010-09-01Bibliographically approved