Author
S. John
Bio: S. John is an academic researcher. The author has contributed to research in topics: Corrosion & Electroless nickel. The author has an hindex of 1, co-authored 1 publications receiving 56 citations.
Topics: Corrosion, Electroless nickel, Coating
Papers
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TL;DR: In this paper, the authors have reported on the development of a biodegradable electroless Ni-B bath and evaluated its characteristic properties, and the influence of bath constituents, temperature and pH on the rate of deposition was studied.
Abstract: 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...
67 citations
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TL;DR: In this article, the authors reviewed the tribological advancement of different electroless nickel coatings based on the bath types, structure and also the tribo testing parameters in recent years.
477 citations
TL;DR: In this paper, a taguchi-based grey relational analysis is employed for the optimization of this multiple response problem using an L 27 orthogonal array to minimize the friction and wear characteristics of electroless Ni-B coatings simultaneously by optimizing the three coating parameters.
87 citations
TL;DR: In this article, high-boron electroless nickel was synthesized on mild steel substrates by modification of the plating conditions of a mid-bron (5-6-wt% B) plating bath.
Abstract: 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.
70 citations
TL;DR: In this article, Ni-B coatings have been deposited directly on commercial purity magnesium and AZ91D alloy and characterized using glow discharge optical emission spectroscopy, scanning electron microscopy, X-ray diffraction and, for tribological and mechanical evaluation, dry sliding wear and friction testing and microhardness measurement.
68 citations
TL;DR: In this paper, the experiments are carried out to reduce the friction and improve corrosion resistant properties of Ni-B coating by PTFE impregnation, and it is found that Ni-b coating after impregnated by an aqueous solution containing 40 ¼wt% pTFE nanoparticles is able to withstand a rubbing test duration of 3600 s with the coefficient of friction as low as
Abstract: Electroless nickel boron (Ni-B) coatings are finding their applications in the aerospace, automotive, chemical and electrical industries due to their properties such as high hardness and high wear resistance. However, Ni-B coatings generally show high friction. They also suffered from severe attacks in aqueous solution containing Cl− ion. In this paper, the experiments are carried out to reduce the friction and improve corrosion resistant properties of Ni-B coating by PTFE impregnation. It is found that Ni-B coating after impregnated by an aqueous solution containing 40 wt% PTFE nanoparticles is able to withstand a rubbing test duration of 3600 s with the coefficient of friction as low as
65 citations