Advantage of an in-situ reactive incorporation over direct particles incorporation of V2O5 for a competitive plasma electrolysis coating
By Kaseem, Mosab; Hussain, Tassawar; Rehman, Zeeshan Ur; Banisalman, Mosab Jaser; Ko, Young Gun
Published in Surface and Coatings Technology
Surface and Coatings Technology
2020
Abstract
With the target to improve the electrochemical and catalytic responses of Al alloy, the introduction of chemically inert phases of V2O5 in the coating is explored via both the direct nonreactive incorporation route utilizing V2O5 nanoparticles, and via in-situ reactive incorporation route using ammonium salt of metavanadate (NH4VO3). The Al2O3 formed during plasma electrolysis (PE) process is very suitable to form a substitution solid solution with V2O5, as both the Al+3 and V+5 ions have almost similar ionic radii. The formed solid solution upon cooling would be a promising coating layer with high electrochemical stability and inertness. Our investigation suggests that the in-situ reactive route of solid solution formation and PE coating can provide more stable and inert coating with an excellent electrochemical behavior despite the intrinsic porous nature of PE coating. The intrinsic porous nature of PE coating, however, provided catalytic activity making it a functionalized coating utilized for degradation of organic dyes, thus satisfying both structural and functional properties with a sort of trade-off efficiencies. The chemically inert incorporation of V2O5 is higher in proportion on substrate coating treated with NH4VO3 additive shown by EDS and XPS results and by the color differences of the coatings observed visually. The inert and stable compositions with higher thickness tend to improve its electrochemical behavior and the influence of V2O5 on coating structure, morphology, phase composition, physical appearance, and catalytic performance is discussed in details in this work.