Ключевые слова: электрохимический синтез, формообразующая обработка, полилигандные комплексы, механизм катодных реакций, импульсный электролиз, каталитическая активность, металлы платиновой группы.
Nenastina T.A. Improvement of the electrochemical technique for palladium and palladium-nickel alloy catalytic coating. Manuscript.
Thesis for granting the Degree of the Candidate of Technical Sciences according to the specialist 05.17.03 – Technical Electrochemistry, National Technical University “Kharkiv Polytechnical Institute”, Kharkiv, 2008.
The thesis deals with scientific foundations of improving the process of electroplating the catalytically active coatings based on palladium and its alloy Pd-Ni. The author developed the electrochemical method of carrier surface preparation, determined the kinetic parameters of electrochemical process for electrode materials formation from corrosion-resistant steel with a highly-developed surface and proposed the electrolyte and the electrolysis mode for highly-resistant surface formation. The stability of pyrophosphate and pyrophosphate-ammonia complexes of palladium was determined, and the polyligand system for palladium and its alloys deposition was proposed. The author also established the palladium ions reduction mechanism and determined the nature of limiting stage in complex electrolytes, proved the existence of prior chemical stage – complexes dissociation, – optimized conditions for palladium-containing coatings formation process execution on the basis of obtained chemical parameters and validated the electrolyte composition. The author proposed to use pulse modes for deposition of palladium-containing alloys making possible to increase the content of a non-precious component in the alloy and current output as well as to intensify coating deposition process. On the evidence of the study of corrosion resistance and palladium-containing coatings’ catalytic activity n electrochemical processes and gaseous-phase reactions the author proposed to use in catalytic systems palladium-nickel alloy with nickel content 20%.
Keywords: electrochemical synthesis, formforming treatment, polyligand electrolyte, cathode reactions mechanism, pulse electrolysis, catalytic activity, platinum group metals, technological process.