Cold-Rolled Binary Palladium Alloys with Copper and Ruthenium: Injection and Extraction of Atomic Hydrogen

• Published in: Russian journal of electrochemistry Vol. 58; no. 9; pp. 812 - 822
• Main Authors: Fedoseeva, A. I., Morozova, N. B., Dontsov, A. I., Kozaderov, O. A., Vvedenskii, A. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.09.2022; Springer Nature B.V
• Subjects: Alloys; Annealing; Aqueous solutions; Binary alloys; Cathodes; Chemical composition; Chemistry; Chemistry and Materials Science; Cold rolling; Copper; Diffusion rate; Electrochemistry; Hydrogen; Low level; Mass transfer; Mathematical models; Palladium; Palladium base alloys; Parameters; Permeability; Physical Chemistry; Rate constants; Sulfuric acid; Thickness; β-phase solid solution; atomic hydrogen; cold rolling; bcc lattice; anodic extraction; cathodic injection; hydrogen permeability; cathode-anode chronoamperometry; palladium–copper and palladium–ruthenium alloys
• ISSN: 1023-1935; 1608-3342
• DOI: 10.1134/S1023193522090051

The effect of annealing and chemical composition of cold-rolled palladium–copper (57 at % Cu) and palladium–ruthenium (6 at % Ru) alloys on the processes of injection and extraction of atomic hydrogen in an aqueous solution of 0.1 M H 2 SO 4 was studied by two-stage cathode–anode chronoamperometry. The close values of the parameters of hydrogen permeability, found from the cathode and anode chronoamperograms, indicate a low level of imperfection of the alloy structure. It has been established that the choice of a mathematical model for processing the chronoamperometry results is determined by the thickness of the alloy samples. The finite-thickness model can be applied if the sample thickness does not exceed 10 µm. Preliminary annealing of samples leads to a decrease in hydrogen permeability and an increase in the effective rate constants of the injection and extraction of atomic hydrogen. At the same time, the palladium-ruthenium alloy is characterized by a higher rate of diffusion mass transfer, while the copper–palladium alloy is characterized by increased values of the kinetic parameters of atomic hydrogen transfer.