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.
Papers published on a yearly basis
Papers
More filters
Patent•
23 Apr 2004
TL;DR: In this paper, a substitution type gold plating liquid with which plating is possible at a practical rate even on an electroless nickel film having a high concentration of phosphorus, and a solder joining applied to the surface of the obtained gold film exhibits sufficient strength even in the case of lead-free type solder.
Abstract: PROBLEM TO BE SOLVED: To provide a substitution type gold plating liquid with which plating is possible at a practical rate even on an electroless nickel film having a high concentration of phosphorus, and a solder joining applied to the surface of the obtained gold film exhibits sufficient strength even in the case of lead-free type solder. SOLUTION: The electroless gold plating liquid for forming a gold film on an electroless nickel plating film comprises: (a) a water soluble gold compound; (b) a conductive salt composed of an acidic substance having an acid dissociation constant (pKa) of ≤2.2; and (c) an oxidation inhibitor composed of a heterocyclic aromatic compound having two or more nitrogen atoms in the molecule as essential constitutive components. COPYRIGHT: (C)2006,JPO&NCIPI
6 citations
TL;DR: In this paper, the results show that after a 2min heat treatment under 800/spl deg/C in a high vacuum environment, the plating acquires a crystalline structure with microhardness exceeding 1100 HV and a very good adhesion to the substrate material, without deteriorating its corrosion wear properties.
Abstract: Electroless nickel plating has been tried on steel or brass substrates. By selected conditions of heat treatment in a high vacuum environment the plating can produce chromium equivalent hardness without the effluents of the hard chromium plating process. The resulting surfaces were examined and characterized under an optical and a scanning electron microscope. X-ray diffraction analysis was also performed to investigate recrystallization effects. The fabricated contact materials were also tested under corrosion conditions and linear polarization measurements were performed. To exploit possible utilization of produced coatings as electrical contact or connector materials, semispherical nickel plated steel joints were tested under the simultaneous application of mechanical fretting and a low-voltage electrical load. Their contact resistance was monitored during 20,000 cycle tests. The results show that after a 2-min heat treatment under 800/spl deg/C in a high vacuum environment, the plating acquires a crystalline structure with microhardness exceeding 1100 HV and a very good adhesion to the substrate material, without deteriorating its corrosion wear properties. In addition they exhibit a low and stable electrical contact resistance when operating in adverse environments i.e. fretting conditions or corrosive atmosphere.
6 citations
TL;DR: In this paper, the initial deposition mechanism of electroless nickel plating on AZ91D magnesium alloy was investigated by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX).
6 citations
TL;DR: In this paper, metal-coated fiber Bragg grating (FBG) temperature sensors were prepared via electroless nickel (EN) plating and tin electroplating methods on the surface of normal bare FBG.
6 citations
TL;DR: In this paper, a novel palladium-free and environmentally friendly surface activation process was applied to prepare nickel plated fabric, which exhibited saturation magnetization with coating mass of 331.4 emu/g and good electromagnetic shielding effectiveness.
Abstract: In this work, a novel palladium-free and environmentally friendly surface activation process was applied to prepare nickel plated fabric. Firstly, chitosan (CTS) film was formed on the polyamide (PA) surfaces. Then, the electroless nickel plating was carried out on the surface of textile in the absence of Sn through the electroless plating technique. The morphology of nickel-plated PA fabrics was characterized by scanning electron microscope (SEM), energy disperse spectroscopy (EDS) and X-ray diffraction patterns (XRD). The plated nickel fabric exhibited saturation magnetization with coating mass of 331.4 emu/g and good electromagnetic shielding effectiveness (50 dB) in frequency range from 300 KHz to 3000 MHz). This approach reveals a promising potential to fabricate electromagnetic shielding materials, in which nickel salt is as activator instead of metallic palladium to realize the palladium-free activation.
6 citations