Journal ArticleDOI
Autocatalytic electroless nickel-boron plating on light alloys
TLDR
In this paper, the authors examined the possibility of depositing a thick autocatalytic electroless Ni-B plating on aluminium alloys and proposed an alkaline bath containing sodium borohydride as the reducing agent.Abstract:
Light alloys are more and more widely used, notably in aeronautics and the car industry. To improve their superficial properties, they can be covered with a hard and wear resistant protective layer. In this article, we examine the possibility of depositing a thick autocatalytic electroless Ni–B plating on aluminium alloys. We propose an alkaline bath containing sodium borohydride as the reducing agent. The deposition rate is held constant by a regular replenishment of the Ni–B bath allowing a rate of about 25 μm/h. The Knoop microhardness of the Ni–B deposits after the bath reaches about 750 hk100. Appropriate heat treatment can increase the deposit microhardness up to more than 1000 hk100 but must be applied with regard to the substrate properties. The study of these heat treatments will be published in a further paper.read more
Citations
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Journal ArticleDOI
Mechanical and wear characterization of electroless nickel-boron coatings
TL;DR: Nanocrystalline electroless nickel-boron deposits were synthesized on mild steel (St-37 ASTM A36) substrates and submitted to heat treatment under non-reactive atmosphere to enhance their properties as discussed by the authors.
Journal ArticleDOI
Tribological behavior of electroless Ni–B coatings on magnesium and AZ91D alloy
E. Correa,A.A. Zuleta,L. Guerra,Maryory Astrid Gómez,Juan G. Castaño,Félix Echeverría,H. Liu,Peter Skeldon,G.E. Thompson +8 more
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.
Journal ArticleDOI
Application of nitriding to electroless nickel–boron coatings: Chemical and structural effects; mechanical characterization; corrosion resistance
TL;DR: In this paper, the effects of both treatments were compared: after the treatment carried out under lowered pressure, the coatings are dense, present signs of solution hardening and are characterized by a high hardness (close to 1600 hv100).
Journal ArticleDOI
Studies on development of electroless Ni-B bath for corrosion resistance and wear resistance applications
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.
Journal ArticleDOI
Wear and corrosion resistance of heat treated and as-plated Duplex NiP/NiB coatings on 2024 aluminum alloys
TL;DR: In this paper, an electroless nickel-boron-aluminum alloy was plated with nickelboron coatings by the electroless deposition method and the wear track was examined by SEM and roughness measurement.
References
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Book
Electroless plating : fundamentals and applications
Glenn O. Mallory,Juan B. Hajdu +1 more
TL;DR: The Electroless Plating: Fundamentals and Applications (ESPA) as discussed by the authors is a comprehensive text that covers both fundamental and applied aspects of electroless deposition, and was first introduced at SUR/FIN '91.
Journal ArticleDOI
Nickel plating on steel by chemical reduction
A. Brenner,G. E. Riddell +1 more
TL;DR: In this article, a process was developed for the production of adherent nickel deposits of good quality on steel without the use of an electric current, which was brought about by chemical reduction of a nickel salt with hypophosphites in a hot ammoniacal solution.
Journal ArticleDOI
Anodic Oxidation of Reductants in Electroless Plating
TL;DR: In this paper, the anodic oxidation of reductants (hypophosphite, formaldehyde, borohydride, dimethylamine borane, and hydrazine) was studied on different metal electrodes (Au, Pt, Pd, Ag, Cu, Ni and Co) at various temperatures, with special interest in the catalytic aspect of electroless plating.
Related Papers (5)
Heat treatments for electroless nickel–boron plating on aluminium alloys
Fabienne Delaunois,P Lienard +1 more