Topic
Electroless nickel plating
About: Electroless nickel plating is a research topic. Over the lifetime, 1593 publications have been published within this topic receiving 14940 citations.
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TL;DR: In this article, reinforcement of electroless Ni-P plate with ZrO2 has been proposed and shown to have high stability and excellent electrocatalytic activity in hydrogen evolution reaction.
20 citations
Patent•
02 Feb 2011
TL;DR: In this article, a method for performing electroless nickel plating on the surface of aluminum nitride ceramic, belonging to the ceramic thin-film metallization field, is described.
Abstract: The invention provides a method for performing electroless nickel plating on the surface of aluminum nitride ceramic, belonging to the ceramic thin-film metallization field The method comprises the following specific steps: 1) polishing the surface of aluminum nitride with a machinery; coarsening the aluminum nitride substrate with mixed acid or alkali, completely cleaning away the residual acid or alkali; 3) sensitizing the coarsened substrate in stannous chloride solution, activating in palladium chloride solution or performing activation without palladium; 4) weighting a certain amount of nickel sulphate, sodium hypophosphite, sodium citrate, sodium acetate, lactic acid, thiourea and sodium dodecyl sulfate in sequence to prepare a chemical plating solution; and 5) adjusting the pH value of the solution to 40-60 with acid or alkali, heating the solution to 70-95 DEG C, and placing the prepared substrate in the solution to perform electroless nickel plating The invention is characterized in that the electroless nickel plating can be performed on the surface of the aluminum nitride ceramic substrate which is difficult to plate; and a certain amount of surfactant is added so that the plating becomes denser and smoother, the binding force between the plating and the substrate is increased, and the solderability of the plating is better
20 citations
Journal Article•
TL;DR: In this paper, the real reason electroless nickel plating works-a no-shortcut pretreatment process-was addressed, and details of one process that has been successful on all types of ferrous metals, including high alloy, carburized and hardened substrates, was described, with focus on using the proper electrolytic processes.
Abstract: Inadequate surface preparation is a common pitfall associated with adhesion or corrosion-resistant failures. This paper addresses the real reason electroless nickel plating works-a no-shortcut pretreatment process. The details of one process that has been successful on all types of ferrous metals, including high alloy, carburized and hardened substrates, is described, with focus on using the proper electrolytic processes
20 citations
TL;DR: In this article, the effects of two different pretreatments on direct electroless nickel plating of magnesium alloys have been studied in order to obtain an environmentally friendly process of pretreatment.
Abstract: The effects of two different pretreatments on direct electroless nickel plating of magnesium alloys have been studied in order to obtain an environmentally friendly process of pretreatment. The surface morphology, chemical composition and corrosion resistance were characterised using SEM, energy dispersive X-ray and polarisation curves. An environmentally friendly pretreatment has been finally established by the procedure of pickling with nitric acid plus phosphoric acid, twice activating with K4P2O7 and NH4HF2. It is found that a coarse surface was produced on the Mg substrate via the researched pretreatment. The adherence between the coating and the substrate was improved. A compact Ni–P alloy coating with better adhesion and corrosion resistance was fabricated. The phosphorus content in the coating was ∼11·24%.
20 citations
TL;DR: In this paper, a new pretreatment process for electroless Ni-P plating on Mg-10Gd-4.8Y-0.6Zr was investigated.
Abstract: A new pretreatment process for electroless Ni-P plating on Mg-10Gd-4.8Y-0.6Zr was investigated in this paper. The morphology, component, chemical composition and structure of the pretreatment layers and Ni-P coating were analyzed by scanning electronic microscopy, energy dispersive spectroscopy and X-ray diffraction spectroscopy. The structure of Ni-P coating was also detected by transmission electron microscopy (TEM). Potentiodynamic polarization analysis and salt spray test were used to test the corrosion resistance of the Ni-P coating. Experimental results indicate that: metal Cr generated in the new pretreatment process, which provided active points for later zinc immersion process, was beneficial to nickel deposition. The subsequent Ni-P coating was amorphous, in which the content of P was 9.43 wt.%. It was uniform and its thickness reached about 50 μm at 2 h deposition. Compared to Mg-10Gd-4.8Y-0.6Zr alloy substrate, the corrosion potential of the coated alloy shifted by 1090 mV positively and the corrosion current density decreased one order of magnitude in 3.5 wt.% NaCl solution. The salt spray test time of Ni-P coating was 210 h. All of these results suggest that the electroless nickel plating procedure researched in this paper is suitable for Mg-10Gd-4.8Y-0.6Zr alloy.
20 citations