Work

Characterization and mechanical behavior of electroless Ni-P and Ni-Co-P plating using ultrasonic-assisted

Year: 2026

Type: article

Abstract: Brass is widely used in industrial components owing to its excellent machinability and conductivity; however, its relatively low hardness, wear resistance, and corrosion resistance limit its durability in demanding environments. In this study, the incorporation of CoSO₄ (30 g/L) into the Ni-P plating bath to form Ni-Co-P coatings on brass micro-journal bearings with an inner diameter of only 2 mm can enhance mechanical properties and corrosion protection. Electroless plating was selected for its advantage of depositing a uniform coating on complex geometries and micro-scale inner structures. The experimental apparatus includes a plating bath, a constant-temperature heater, a stirring device, and a pH-monitoring and exhaust system. The results confirm that Ni-Co-P coatings exhibit superior performance compared with Ni-P coatings, demonstrating the beneficial effect of Co incorporation. Ultrasonic-assisted electroless plating eliminates hydrogen-bubble accumulation and enhances mass transfer effect via acoustic cavitation, refining the microstructure to yield a denser coating with fewer defects. These findings greatly improve the coating’s hardness, corrosion resistance, and fatigue life, highlighting its significant potential to enhance coating reliability in mechanical and corrosive environments.

Source: The International Journal of Advanced Manufacturing Technology

DOI: 10.1007/s00170-026-17446-6

Authors: Ruei-Chi Hsu, Hung-Yin Tsai

Institutions: National Tsing Hua University, National Institutes of Applied Research

Language: English

Topic: Electrodeposition and Electroless Coatings

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: hybrid

Estimated APC paid: $3,990