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 properties and scratch test resistance of nickel–boron coated aluminium alloy after heat treatments
TL;DR: In this article, a comparative hardness study was conducted to assess the influence of load, indent position (free surface or cross section), and heat treatment on the results of the indentation tests.
Journal ArticleDOI
Tribological characteristics of electroless Ni–B coating and optimization of coating parameters using Taguchi based grey relational analysis
Suman Das,Prasanta Sahoo +1 more
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.
Journal ArticleDOI
Mechanical and electrochemical properties of ultrasonic-assisted electroless deposition of Ni–B–TiO2 composite coatings
Vahid Niksefat,Mohammad Ghorbani +1 more
TL;DR: In this article, the hardness and friction coefficient of as-plated and heat treated Ni-B and NiNi-B-TiO2 composite coatings were determined by Vickers diamond indentation and indentation scratch tests and compared with Ni−B coatings.
Journal ArticleDOI
Synthesis and properties of electrodeposited Ni–B–CeO2 composite coatings
TL;DR: In this article, a comparison of properties of Ni-B and Ni−B-CeO2 composite coatings is presented to elucidate the useful role of CeO2 addition.
Journal ArticleDOI
Structural state of electroless nickel-boron deposits (5wt.% B): Characterization by XRD and TEM
TL;DR: In this paper, the structure of electroless nickel-boron with a boron content around 5.5% was investigated in the as deposited and heat treated states by X-ray diffraction and by transmission electron microscopy on thinned cross-sections prepared by focused ion beam technique.
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