Structure, Composition and Corrosion Resistance of Zn-Ni-P Alloys Electrodeposited from an Ionic Liquid Based on Choline Chloride

Abstract

Ternary Zn–Ni–P alloy coatings were electrodeposited from electrolytes based on choline-chloride ionic liquid. Their phases, microstructures, chemical compositions and corrosion behaviors were characterized as a function of electrodeposition current density. Varying the deposition current density has an influence on the composition and corrosion resistance of the obtained amorphous Zn-Ni-P deposit. The chemical composition results show that during electrodeposition from ionic liquids, P is incorporated into the Zn-Ni alloy through an indirect mechanism. The amount of phosphorus and nickel of the alloy decreases with an increase in the deposition current density while that of zinc increases, which corresponds to normal co-deposition mechanism. From the two electrolytes considered, the morphology of the Zn-Ni-P alloy electrodeposited evolved from a superficial network of fine cracks to larger cracks with an increase of the deposition current density. From polarization curves of coatings in 3.5% NaCl, it is shown that the P incorporated Zn-Ni alloy coatings exhibit a remarkably enhanced corrosion resistance and barrier properties, and the protective ability increases with decrease in the deposition current density.

Potential applications of deep eutectic solvents in nanotechnology

“…This was reported for single metal coating (such as Ni [76]) and multi-ingredient coating (such as Ni/MWCNT composite [77], Co-Sn alloy [78], Ni-P alloy [79], Zn-Ni-P [80] and Mg-Nd-Zn-Zr alloy [81]). DES electrolytes have offered a flexibility to obtain several film compositions for different coating purposes.…”

Mapping the Knowledge Domain of Corrosion Inhibition Studies of Ionic Liquids

“…The second phase (2014–2018) is the transformation burst stage, and the burst keywords that grow steadily in this stage are deposition, media, contact, and solubility . This stage belongs to the rapid variation period, and there is more research literature related to ionic liquid corrosion inhibition in this stage.…”

“…The first stage (2011–2013) is the predevelopment stage. The burst words in this stage were electrophoresis, corrosion, , aluminum, and alloy. The burst keywords in this stage lasted for a long time, so it was considered that this stage provided the basis for the study of subsequent research.…”

Electrodeposition in Ionic Liquids

“…Furthermore, it was easy to tune the morphology, composition and phase structure of ZnCo alloys by adjusting the deposition potential. In another work by Fashu and coworkers, it was found that the electrodeposition of ZnNiP in choline chloride‐based DES also followed a normal codeposition mechanism. The composition, morphology and corrosion resistance of ZnNiP deposits depended on current density.…”