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
More filters
Journal ArticleDOI
Improvement of anticorrosion and adhesion to magnesium alloy by phosphate coating formed at room temperature
TL;DR: In this paper, a new surface protection process was developed to magnesium alloy against corrosion in aggressive environments, where a phosphate coating was formed on rinsed magnesium alloy and powder painting was carried out on the phosphated magnesium alloy.
Journal ArticleDOI
Properties of Hard Ni–P–Al2O3 and Ni–P–SiC Coatings on Al-Based Casting Alloys
TL;DR: In this paper, electroless Ni−P−Al2O3 and Ni-P−SiC composite coatings on an aluminium-silicon casting alloy are studied and the structural study, hardness, and abrasion tests reveal that properties of the coatings strongly depend on the composition of deposition bath and on the heat treatment.
Journal ArticleDOI
Morphology and composition of nickel–boron nanolayer coating on boron carbide particles
TL;DR: In this article, the electroless coating of Ni-B nanolayer on B4C particle surfaces was studied and the effect of activation agent PdCl2, complexing agent C2H8N2, and reducing agent NaBH4 addition rate were investigated.
Journal ArticleDOI
Electroless nickel fabrication on surface modified magnesium substrates
TL;DR: In this article, a comprehensive analysis is devised based on the pre-existing treatment methods for accomplishing the same, and a review article systematically colligates various considerations and evaluations on electroless nickel applications of magnesium and its alloys and explicates how it anchors its practice in the respective domains.
Journal ArticleDOI
Nickel–boron plating on magnesium and AZ91D alloy by a chromium-free electroless process
E. Correa,A.A. Zuleta,M. Sepúlveda,L. Guerra,Juan G. Castaño,Félix Echeverría,H. Liu,Peter Skeldon,George Thompson +8 more
TL;DR: Ni-B coatings have been deposited directly on commercial purity magnesium and AZ91D magnesium alloy by a chromium-free electroless process and characterized using scanning electron microscopy, glow discharge optical emission spectroscopy, gravimetric measurements and, for corrosion evaluation, hydrogen evolution as mentioned in this paper.
References
More filters
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