Coating of aluminum substrates with nanostructured Pd–Ni alloys by electrodeposition

MENESES, FERNANDO; RIVA, JULIETA S.; URRETA, SILVIA E.; BERCOFF, PAULA G.

MATERIALS CHEMISTRY AND PHYSICS

ELSEVIER SCIENCE SA

Año: 2022 vol. 277

0254-0584

Pd-Ni alloys are electrodepositedonto low-purity aluminum substrates varying both the composition of the feedingsolution and the appliedelectrodeposition potential.It is found that the initial nucleation-and-growth mechanism in every case iswell described by a 3D-type nucleation process. The resulting deposits consistof Pd-Ni alloys of different compositions, all electrocrystallized in adisordered fcc phase; depending onthe electrodeposition parameters, different morphologies and compositions areobtained. It is found that when the electrodeposition potential is high and thePd content in the feeding solution is low, the substrate coating is moreefficient and the deposit morphology tends to refine into dendritic-like structures,making this kind of deposit quite interesting for using as electrodes inelectrochemical devices. Room temperature magnetic measurements indicate thatthe samples are soft ferromagnetic with negligible demagnetizing effects. Dendriticand spheroidal-like Pd-rich deposits exhibit larger remanence values and aremore coercive than those with higher Ni content due to the dependence of theanisotropy constant on the alloy composition.