CHARACTERIZATION OF MANGANESE-CONTAINING Co-W COATINGS ELECTRODEPOSITED FROM ELECTROLYTES WITH VARIOUS ORGANIC COMPLEXING AGENTS
G. Tsurtsumia1, N. Nioradze1, T. Lezhava1, N. Koiava1, P. Nikoleishvili1, N. Jokhadze1, R. Kurtanidze1, G. Gorelishvili1, B. Godibadze2
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
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).
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).
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