Electrodeposition of Ni-P composite coatings: A review

TL;DR

This review discusses the electrodeposition of Ni-P composite coatings, highlighting recent advances, models, and future research opportunities for improving coating properties with various embedded particles.

Contribution

It provides a comprehensive overview of research on Ni-P composite coatings with embedded particles, including models, process control, and future directions.

Findings

Enhanced hardness with thermal treatment

Improved deposit properties with particle codeposition

Various particles like SiC, WC, TiO2 improve coating performance

Abstract

Ni-P coatings produced by electrodeposition have important mechanical, tribological and electrochemical properties. They can also exhibit catalytic activity and beneficial magnetic behaviour. With subsequent thermal treatment, the hardness of such Ni-P coatings can approach or exceed that of hard Cr coatings. Electrochemical codeposition of homogeneously dispersed second phase particles within the Ni-P matrix can enhance deposit properties and meet the challenging demands on modern engineering coatings. A general overview of research work on the electrodeposition of Ni-P composite coatings containing included ceramic or solid lubricant particles is provided. Advances in research into NieP composite layers reinforced by SiC, B4C, WC, Al2O3, SiO2, TiO2, CeO2, MWCNT, MoS2, WS2, TiN, hexagonal BN, PTFE and their combinations are considered. Major models proposed for the codeposition of particles, the influence of bath hydrodynamics and control of operational parameters are illustrated by examples. Important trends are highlighted and opportunities for future R & D are summarised.