Journal ArticleDOI
Porosity determination of nickel coatings on copper by anodic voltammetry
H.A. Ponte,A.M. Maul +1 more
TLDR
In this article, anodic voltammetry was used to determine the porosity of nickel coating applied to a copper substrate by electrodeposition from a Watts bath on copper substrate, and the results indicated an exponential decay of the coating porosity with respect to the deposit thickness.Abstract:
This paper presents the application of anodic voltammetry to determine the effective porosity in nickel coatings. The nickel coatings were obtained by electrodeposition from a Watts bath on copper substrate. This technique consists in a comparison of the charge density involved in the passivation process of the substrate without coating and that required to passivate the substrate covered with a nickel layer. The passivation solution was a 0.4 M sodium sulfide solution (Na2SO3) at 25 °C selected to maintain the coating inert in the potential region where substrate passivation occurs, thus preserving its integrity. The results indicate an exponential decay of the coating porosity, with respect to the deposit thickness, and a net porosity of 4 to 5%. The relation between porosity decay and deposition potential was investigated for nickel deposition from a Watts bath.read more
Citations
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Journal ArticleDOI
The effects of sacrificial coatings on hydrogen embrittlement and re-embrittlement of ultra high strength steels
D. Figueroa,M.J. Robinson +1 more
TL;DR: In this article, an investigation of electrodeposited Zn-14% Ni and aluminium-based SermeTel 1140/962 coatings as possible replacements for cadmium was performed to measure the extent of direct hydrogen embrittlement of a high strength steel substrate.
Patent
Articles having ceramic coated surfaces
Jan Weber,Michele Zoromski +1 more
TL;DR: In this article, a substrate and a carbon nanotubes are provided, which include a raised ceramic shells connected by a ceramic layer that is conformal with the substrate, covering at least a portion of the carbon carbon.
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Medical Devices Having Nanoporous Coatings for Controlled Therapeutic Agent Delivery
TL;DR: In this article, implantable or insertable medical devices are provided which contain (a) one or more depressions that contain at least one therapeutic agent, and (b) a nanoporous coating, disposed over the therapeutic-agent-containing depressions, which regulate transport of species.
Patent
Drug-releasing stent with ceramic-containing layer
TL;DR: A vascular or endoluminal stent is adapted to be implanted in a vessel, duct or tract of a human body to maintain an open lumen as mentioned in this paper, which includes a base layer of a biologically compatible metal.
Patent
Medical devices with drug-eluting coating
Jan Weber,Matthew J. Miller +1 more
TL;DR: In this article, a medical device having a body of interconnected bands and connectors forming an elongated tubular structure having an inner luminal wall surface, an outer abluminal wall surfaces and a side wall surface and defining a central lumen or passageway, wherein said inner lumen and side wall surfaces of the band and connectors form transverse passageways through the elongated tube structure is described.
References
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Journal ArticleDOI
Electrochemical Determination of the Porosity of Single and Duplex PVD Coatings of Titanium and Titanium Nitride on Brass
W. Tato,D. Landolt +1 more
TL;DR: In this article, the porosity was measured using dc polarization resistance of the uncoated and coated substrate at constant potential, and the ratio of current maxima observed during dissolution of brass substrate in presence and absence of a coating was taken as a measure of porosity.
Journal ArticleDOI
Cyclic voltammetry measurements of different single-, bi- and multilayer TiN and single layer CrN coatings on low-carbon-steel substrates
M Lakatos-Varsanyi,Darko Hanzel +1 more
TL;DR: In this paper, the electrochemical properties of single layered TiN and CrN films have been compared to bi-and multilayered Ti/TiN coatings deposited on low carbon steel substrate.
Journal ArticleDOI
Quantitative determination of through-coating porosity in thin ceramic physically vapour-deposited coatings
TL;DR: In this paper, an experimental method is proposed to determine in a quantitative way the through-coating porosity of thin ceramic coatings deposited on metallic substrates, based on a coulometric measurement performed during potentiodynamic polarization of a coated sample.
Journal ArticleDOI
Electrolytic Determination of Porosity in Gold Electroplates I . Corrosion Potential Measurements
Journal ArticleDOI
Coulometric measurement of the porosity in thin nickel coatings
TL;DR: In this article, an electrochemical method has been developed to test the porosity in nickel coatings deposited on a CuSn6 substrate, based on the number of coulombs measured during an anodic potentiodynamic polarization of coated samples in a Na 2 SO 4 + Rochelle salt solution.
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