International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Electrochemical behavior of silver in tungstate-molybdate melts was studied by potentiometric and voltammetric methods. The electrode process was identified as a single-electron reversible one. The effect of silver on the electrochemical deposition of molybdenum carbide coatings and their electrochemical corrosion behavior in a sodium polysulfide melt was studied.

The objects of this study are galvanically deposited Zn and Zn-Ni-P coatings additionally treated (passivated) in environmentally friendly Cr(III)-based composition for obtaining of conversion films (CF). The aim of this treatment is to improve the corrosion-resistant properties of the coatings.

The elemental composition and surface morphology of the newly obtained systems “galvanic coating/conversion film” are investigated with EDS and SEM analyses.

Protective properties of the conversion films are defined with potentiodynamic polarization curves and polarization resistance measurements in a model medium containing chloride ions (5% NaCl) which leads to appearance of local corrosion.