OPTIMIZATION OF THE BASIC PARAMETERS OF CATHODIC DEPOSITION OF Ce-CONVERSION COATINGS ON D16 AM CLAD ALLOY

The present research work is investigation on the probabilities for application of a new cerium compound, for cathodic electrodeposition of cerium based conversion coatings (CeCC) for protection of D16 AM alloy against corrosion. For the purpose of the present study, diammonium pentanitrocerate (NH 4 ) 2 Ce(NO 3 ) 5 was used, where the cerium is represented in the anionic moiety, instead of the electrolytes used up to nowadays. The barrier ability and durability against corrosion of all coatings were evaluated by electrochemical methods – Linear Sweep Voltammetry (LSV) and Electrochemical Impedance Spectroscopy (EIS). Additionally, selected specimens underwent morphological characterization by means of canning Electronic Microscopy (SEM) combined with Energy Dispersive X-ray spectroscopy (EDX). As a result, various parameters and conditions of deposition, such as the preliminary treatment, concentration of the basic substance and additives, density of the applied electric current and duration of deposition were elucidated.