Cobalt-molybdenum-phosphorus alloys: Electroplating and corrosion properties

Autor:	E. J. Podlaha-Murphy, Henrikas Cesiulis, V. Kublanovsky, O. Bersirova, Yu. S. Yapontseva
Rok vydání:	2009
Předmět:	Materials science Hypophosphite Phosphorus Organic Chemistry Hydrazine Inorganic chemistry Metals and Alloys chemistry.chemical_element Sodium hypophosphite Surfaces Coatings and Films Corrosion chemistry.chemical_compound chemistry Molybdenum Materials Chemistry Electroplating Cobalt
Zdroj:	Protection of Metals and Physical Chemistry of Surfaces. 45:588-594
ISSN:	2070-206X 2070-2051
Popis:	The relation between the composition, morphology, and corrosion resistance of the electrolytic CoMoP coatings plated at various current densities from citrate baths containing ammonia or hydrazine and various amounts of sodium hypophosphite is studied. Phosphorus was included in the coatings as a result of the electrochemical reduction of hypophosphite ions. Ternary Co-Mo-P alloys containing up to 26 at % Mo and up to 3 at % P were electroplated. Coatings of the highest quality were obtained from a bath containing hydrazine admixture at a temperature of 50°C. Corrosion resistance of CoMoP coatings increases with an increase in the Mo content and a certain decrease in the phosphorus amount in the deposit. The best protective properties were demonstrated by coatings obtained at higher concentrations of sodium hypophosphite and high deposition current densities when CoMoP alloys containing 23 ± 2 at % Mo and up to 1.5 at % P were formed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::64bda2bf91130d56a016634492e2b3d0 https://doi.org/10.1134/s2070205109050165 Zobrazit plný text záznamu Plný text ve formátu PDF