Chemical Problems; 2026; V. 24(4); p. 553-569
CHARACTERIZATION OF MANGANESE-CONTAINING Co-W COATINGS ELECTRODEPOSITED FROM ELECTROLYTES WITH VARIOUS ORGANIC COMPLEXING AGENTS
1 Ivane Javakhishvili Tbilisi State University, R. Agladze Institute of Inorganic Chemistry and Electrochemistry, 11 Mindeli Str., Tbilisi 0186, Georgia
2 F. Tavadze Institute of Metallurgy and Materials Science, 8b E. Mindeli Str., Tbilisi 0186, Georgia
E-mail:
nikoloz.nioradze@tsu.ge
Received Date: 2025-05-14
Accepted Date: 2025-08-22
Keywords:
Co-Mn/Co-W galvanic coatings, (Mn, Co)₃O₄ spinel layers, Solid-oxide fuel cells (SOFCs), Tungsten electrodeposition, Amorphous α-Co solid solution.
Notes:
Abstract: Galvanic coatings of Co-Mn are promising materials for obtaining protective spinel layers of (Mn,Co)₃O₄ on stainless steel, which can be successfully used in solid-oxide fuel cells (SOFCs) as interconnects. To enhance the anti-corrosion and heat resistance properties of Co-Mn, tungsten is introduced into the coatings via electrodeposition. Mn-containing Co-W coatings electrodeposited from electrolytes containing various non-toxic organic complexing agents show a shiny appearance are roughly 5 μm in thickness, have strong adherence to electrodes, and have uniformly incorporated oxygen. We found pH and current density dependence of Mn-containing Co-W coating content in an electrolyte containing a sodium citrate-EDTA complexing agent. X-ray structural analysis indicates that the Mn-containing Co-W coatings are likely amorphous, consisting of an α-Co solid solution with disordered dissolution of W and Mn. The corrosion potential Ecor of Mn-containing Co-W coatings deposited on a graphite cathode in a 3.5% aerated NaCl solution is -0.530 V (Ag/AgCl).