REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

the influence of carbamide additive on the properties of electrodeposited manganese coatings

mladen vuruna

Military Academy, University of Defense, Belgrade, Serbia, nacelnik@va.mod.gov.rs

mihael bučko

Military Academy, University of Defense, Belgrade, Serbia, mbucko@tmf.bg.ac.rs

ljubica radović

Military Technical Institute, Belgrade, ljmradovic@gmail.com

jelena bajat

Faculty of Technology and Metallurgy, University of Belgrade, Serbia, jela@tmf.bg.ac.rs

Abstract: Pure manganese coatings were prepared on the steel (AISI 4340) electrode by non-conventional electrodeposition method, with the assistance of 8 mol dm^-3 of carbamide as a plating additive. The influence of carbamide on the electrodeposition of Mn was investigated by linear sweep voltammetry. The morphology of the coatings was studied by scanning electron microscopy (SEM), and their elemental composition by energy dispersive X-ray spectrometry (EDS). The results showed that the presence of carbamide in the solution enhanced both the reduction of water and Mn²⁺ ions. Moreover, carbamide improves the characteristics of Mn deposits, i.e. their adhesiveness, porosity, compactness, and appearance. Except from oxygen as a part of Mn corrosion product at the coatings' surface, no carbon or nitrogen incorporation was detected in the deposits by EDS.

Keywords: carbamide, electrodeposition, Mn coating, morphology.