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
Thermal shock behavior of YSZ thermal barrier coatings with a Ni-P/Al/Ni-P sandwich interlayer on AZ91D magnesium alloy substrate at 400 °C
TL;DR: In this paper, a Ni-P/Al/Ni-P sandwich interlayer between the AZ91D magnesium alloy substrate and the NiCrAlY bond coat was fabricated by electroless plating for NiP layer and APS for Al layer.
Journal ArticleDOI
Preparation and characterization of Co–Fe–B thin films produced by electroless deposition
TL;DR: In this article, the formation of electroless Co-Fe-B coatings was investigated on pure copper and 304 stainless steel substrates which were pretreated in a bath containing EDTA (20 g l−1), ethylene diamine (30 g l −1), PdCl2 (10g l− 1) and NaHPO2 (4 gl−1).
Journal ArticleDOI
Electroless and electrolytic deposition of Co–SiC composite coatings on aluminum
Ewa Rudnik,Tomasz Jucha +1 more
TL;DR: In this article, the following consecutive stages were proposed: zincating of aluminum substrate in strong alkaline solutions (cementation, compact deposition, double dip), electroless cobalt deposition in an alkaline solution and, finally, electroless deposition or electrodeposition of the composites.
Journal ArticleDOI
Review of duplex electroless coatings and their properties
TL;DR: Electroless coatings (unary, binary and ternary) are used nowadays on a wide scale due to their good tribological and mechanical properties (anti-wear, friction, hardness, anti-corrosion) as mentioned in this paper.
Journal ArticleDOI
Electroless nickel boron plating on AA6061
TL;DR: In this paper, the authors used an electroless nickel boron (EN-B) plating preceded by the application of a protective zincating/electroless nickel phosphorus coating.
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