Kinetics of cathodic evolution of hydrogen on Ni-P systems electrodeposited alloys
| Autor: | Nadezhda V. Sotskaya, O. V. Dolgikh, Yu. G. Kravtsova, Lyudmila V. Sapronova |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Hydrogen Organic Chemistry Kinetics Metallurgy Metals and Alloys chemistry.chemical_element Sulfuric acid Electrochemistry Alloy composition Surfaces Coatings and Films Cathodic protection chemistry.chemical_compound Adsorption chemistry Chemical engineering Materials Chemistry Hydrogen evolution |
| Zdroj: | Protection of Metals and Physical Chemistry of Surfaces. 51:360-365 |
| ISSN: | 2070-206X 2070-2051 |
| DOI: | 10.1134/s2070205115030247 |
| Popis: | Analysis of experimental data on kinetics of hydrogen evolution reaction from sulfuric acid solutions on electrodeposited Ni,P alloys of various compositions is conducted. It is shown that changeover of mechanism of the process is observed upon increase of cathodic potential: at low overvoltages it occurs mainly via the Volmer-Heyrovsky pathway with control of the charge transfer stage, and the Volmer-Tafel mechanism, the slow stage of which is mechanical recombination, is realized at high potentials. The influence of the alloy composition on the parameters of the process is manifested in the change of charge transfer coefficients of both electrochemical stages and degree of surface filling by adsorbed hydrogen. |
| Databáze: | OpenAIRE |
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