Methods for controlling the composition and morphology of electrodeposited Fe–Mo and Fe–Co–Mo coatings
- Authors: Ved’ M.V.1, Ermolenko I.Y.1, Sakhnenko N.D.1, Zyubanova S.I.1, Sachanova Y.I.1
- 
							Affiliations: 
							- National Technical University
 
- Issue: Vol 53, No 6 (2017)
- Pages: 525-532
- Section: Article
- URL: https://journals.rcsi.science/1068-3755/article/view/230433
- DOI: https://doi.org/10.3103/S1068375517060138
- ID: 230433
Cite item
Abstract
The effect of the electrolyte composition and the stationary electrolysis parameters on the composition and morphology of Fe–Mo and Fe–Co–Mo coatings deposited from complex citrate electrolytes based on Fe(III) is studied. It is shown that, at a constant component ratio of с(Fe3+): с(Co2+): с(MoO2−4): с(Cit3–) = 2: 2: 1: 4, an increase in the electrolyte concentration leads to a decrease in the pH of the solution in a range of 4.85–4.30 and in the molybdenum content in the coating. An increase in the current density contributes to the molybdenum enrichment of the electrodeposited alloy in the entire range of electrolyte concentrations. The Fe–Mo alloy coatings have a rough microporous surface; an increase in the current density does not lead to significant changes in the surface topography. It is found that the formation of ternary coatings is characterized by the competitive reduction of iron and cobalt in the alloy; the molybdenum content depends on the current density. At a metal ratio of 3: 2: 1 and a molybdenum content of up to 17 at % in the Fe–Co–Mo alloy, the surface has a fine-grained needlelike structure typical of cobalt. With an increase in ic, the atomic fraction of molybdenum increases, while the surface becomes microglobular. The Fe–Co–Mo electrodeposits with a metal ratio of 2.5: 1.5: 1.0 and a molybdenum content of 19–20 at % have a more developed surface with a high density of spheroids.
About the authors
M. V. Ved’
National Technical University
							Author for correspondence.
							Email: kirilesha72@yandex.ua
				                					                																			                												                	Ukraine, 							Kharkiv, 61002						
I. Yu. Ermolenko
National Technical University
														Email: kirilesha72@yandex.ua
				                					                																			                												                	Ukraine, 							Kharkiv, 61002						
N. D. Sakhnenko
National Technical University
														Email: kirilesha72@yandex.ua
				                					                																			                												                	Ukraine, 							Kharkiv, 61002						
S. I. Zyubanova
National Technical University
														Email: kirilesha72@yandex.ua
				                					                																			                												                	Ukraine, 							Kharkiv, 61002						
Yu. I. Sachanova
National Technical University
														Email: kirilesha72@yandex.ua
				                					                																			                												                	Ukraine, 							Kharkiv, 61002						
Supplementary files
 
				
			 
					 
						 
						 
						 
						 
				 
  
  
  
  
  Email this article
			Email this article  Open Access
		                                Open Access Access granted
						Access granted Subscription Access
		                                		                                        Subscription Access
		                                					