Efficient Preparation of Nanoparticle-Reinforced Nickel-based Composite Coating with Highly Preferred（220） Orientation

摘要

Nanoparticle-reinforced metal matrix composite coatings have significant potential in mechanical part surface strengthening owing their excellent mechanical properties. This paper reports a phenomenon in which the grain orientation gradually evolves to（220） as the deposition current density increases when preparing nanoparticlereinforced nickel-based composite coatings through jet electrodeposition（JED）. During the preparation of the Ni-SiC composite coatings, the deposition current density increased from 180 A/dm~2 to 220 A/dm~2, and TC（220） gradually increase from 41.4% to 97.7%. With an increase of TC（220）, the self-corrosion potential increases from-0.575 to-0.477 V, the corrosion current density decreases from 9.52 μA/cm2 to 2.76 μA/cm2, the diameter of the corrosion pits that after 10 days of immersion in a 3.5 wt% NaCl solution decreases from 278–944 nm to 153–260 nm, and the adhesion of the coating increases from 24.9 N to 61.6 N. Compared a conventional electrodeposition（CED）, the Ni-SiC composite coating using JED has the advantages of a smooth surface morphology, high corrosion resistance, and strong adhesion, which are more obvious with an increase in TC（220）.