Tribology of electroless nickel coatings – A review

Tribological characteristics of electroless Ni–B coating and optimization of coating parameters using Taguchi based grey relational analysis

This article presents an experimental investigation to assess the influence of input process parameters of machinability of wire electrical discharge machining (WEDM) process for machining of tripl...

https://journals.sagepub.com/doi/pdf/10.1177/2633366X20963137

Investigating the influence of WEDM process parameters in machining of hybrid aluminum composites

High-boron (7–9 wt%) electroless nickel-coatings were synthesized on mild steel substrates by modification of the plating conditions of a mid-boron (5–6 wt% B) plating bath. They were fully characterized and compared when possible with the coatings obtained in the usual operating conditions, before and after a heat treatment at 400 °C for 1 h in a protective atmosphere. The morphology of the coating was similar to mid-boron coatings and left unchanged by heat treatment. Similarly, most properties of the as-deposited coatings were similar for mid and high-boron coatings. However, the effect of heat treatment was very different on both types of coatings: while mid-boron coatings crystallized fully in the Ni 3 B system, high-boron was multiphased. The coatings also presented a difference in terms of hardness behavior with a very important increase for the mid-boron coatings and lesser modification in the case of high boron. The abrasive wear resistance of both kinds of coatings was similar before heat treatment and high-boron coatings had a slightly better behavior after heat treatment. However, the sliding wear behavior of mid-boron coatings is significantly better than that of high-boron electroless nickel.

Increase of boron content in electroless nickel-boron coating by modification of plating conditions

Tribological behavior of electroless Ni–B coatings on magnesium and AZ91D alloy

Electroless deposition process has undergone numerous changes to meet the challenging needs for a variety of industrial applications ever since the invention of the process during 1947. Among the various metals that can be electrolessly plated, electroless nickel has proved its supremacy for producing coatings with high corrosion resistance, hardness, wear resistance and uniformity. Electroless nickel can be deposited from a variety of baths and the coating properties depends upon the type of reducing agents and other deposition conditions. Electroless nickel–boron coatings have received considerable interest nowadays because of the superior hardness, corrosion and wear resistance characteristics. In this paper, the authors have reported on the development of a biodegradable electroless Ni–B bath and evaluated its characteristic properties. The influence of bath constituents, temperature and pH on the rate of deposition was studied. Scanning electron microscopy, X-ray diffraction, X-ray fluoresce...

Studies on development of electroless Ni-B bath for corrosion resistance and wear resistance applications

Electroless plating have unique metallurgical characteristics, and the deposits can be made onto a wide range of substrates, including both metallic and non‐metallic surfaces. In this paper, the authors have reported on the development of new bath formulation for getting Ni–Co–P nanoalloy deposit and optimised bath concentration and operating conditions. The alloy deposit contains 10·59%Co in the Ni–P matrix. There is an increase in hardness and corrosion resistance of the deposit with the incorporation of Co. Furthermore, from the XRD measurements of the deposits, it was found that the alloy is nanocrystalline in nature, and the particle size is around 37–45 nm. Atomic force microscopy results show that the height of the particles is in nanosize, and roughness of the surface is within 3 nm.

Electroless deposition of nickel–cobalt–phosphorus nanoalloy

A systematic read on evaluating the machining characteristics of wire cut electrical discharge machining (WEDM) using analysis of variance (ANOVA) and multilinear regression model based multi objec...

R. Meenakshi

Papers

Studies on development of electroless Ni-B bath for corrosion resistance and wear resistance applications

Electroless deposition of nickel–cobalt–phosphorus nanoalloy

WEDM of Cu/WC/SiC composites: development and machining parameters using artificial immune system

Tribological characteristics of powder metallurgy processed Cu- WC/SiC metal matrix composites

Optimization of machining parameters in wire EDM of OFHC copper using Taguchi analysis