Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Coated articles and related methods

Inactive Publication Date: 2009-11-19
XTALIC CORP
View PDF10 Cites 38 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]Other aspects, embodiments and features of the invention will become apparent from the following detailed description when considered in conjunction with the accompanying drawings. The accompanying figures are schematic and are not intended to be drawn to scale. For purposes of clarity, not every component is labeled in every figure, nor is every comp

Problems solved by technology

Although corrosion is typically a problem when the environment includes a fluid, corrosion also occurs quite commonly in vapor environments.
Metallic articles are often subjected to corrosive environments.
Coatings on such articles can affect surface corrosion in several ways.
However, defects in a barrier coating such as cracks, voids, or pore channels penetrating the coating, can expose the substrate to the corrosive environment.
This may lead to a process of “localized corrosion,” which is generally undesirable.
For example, a coating which discolors, tarnishes, dissolves, or otherwise degrades in a corrosive medium may be undesirable, especially when the coating is applied at least in part for aesthetic purposes.
While tungsten-based coatings may provide reasonable substrate protection, the outer surface of the coating is often prone to chemical corrosion, degradation, discoloration, or tarnishing when exposed to corrosive media.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Coated articles and related methods
  • Coated articles and related methods
  • Coated articles and related methods

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0063]In the following example, articles coated with Ni—W alloys were produced by aqueous electrodeposition. The article to be coated was immersed in a solution, and a current was applied for electrodeposition. The components of the solution used for deposition are listed in Table I, along with some of the conditions used in the electrodeposition process. The pH of the solution was balanced to a value of 8.0 using ammonium hydroxide. Reverse pulsed current was applied with the characteristics shown in Table I. The reverse pulse scheme used here is similar to that taught by U.S. Patent Publication No. 2006 / 02722949. Several coatings were prepared atop brass substrates, using a counter electrode of stainless steel.

TABLE 1Deposition conditions for experiments one and two.Citrate ions63g / LNickel (from nickel sulfate)6.5g / LTungsten (from sodium tungstate)32.5g / LForward current pulse time (ms)16Negative current pulse time (ms)4Positive current density (A / cm2)0.1Negative current density (A...

example 2

[0070]Various properties of the samples produced in Example 1 were then studied to determine the effect of the character and composition of the outermost surface of the coatings on the corrosion properties of the sample. The compositions of the two specimens, Sample A and Sample B, were measured using Auger electron spectroscopy, prior to exposure to a corrosive environment. The Auger electron spectroscopy results indicated that the near surface regions of the two coatings were different.

[0071]Sample A had a surface composition comprising Ni (˜62 at %), W (˜22 at %) and O (˜16 at %). When the oxygen was excluded from the analysis, the ratio of the metals is about 75 at % Ni: 25 at % W, or, expressed in weight percentages, 49 wt % Ni: 51 wt % W. This composition was reasonably close to the bulk measurement provided by the XRF results, with a slight difference likely due to the presence of oxide on the surface. Sample B had a very different surface composition, comprising Ni (˜86 at %...

example 3

[0077]A variety of additional coating samples were produced and their properties studied. For example, Sample C and Sample D were produced using the methods described in Example 1 to produce Samples A and B, respectively, except that organic additives (i.e., leveling agents, wetting agents, brightening agents) were added to the electrodeposition bath in the amount of less than 1 g / L. Those of ordinary skill in the art would recognize that levelers, brighteners, ductility agents, wetters and the like may be commonly used in such small quantities in electrodeposition baths, and that many combinations of these may be present in different baths. In this Example, the presence of small concentrations of organic additive did not change the major results reported above for the Samples A and B. Sample C exhibited CASS corrosion in only a few hours, with quite substantial corrosion after 4 hours. Sample D, however, comprised the corrosion resistant top portion and had a CASS corrosion lifetim...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Timeaaaaaaaaaa
Login to View More

Abstract

Coated articles and related methods are described. In some cases, the coated articles may exhibit high strength, hardness, brightness, abrasion resistance, corrosion resistance, and other desirable structural and functional properties. In some embodiments, the coatings may include an alloy, such as a nickel-tungsten alloy and / or metal oxides.

Description

FIELD OF INVENTION[0001]The present invention relates generally to coated articles and related methods and, more particularly, to metal coated articles produced using electrodeposition processes.BACKGROUND OF INVENTION[0002]Coatings are often used to impart a unique functionality to the surface of an article. For example, metallic coatings deposited from electroless or electrolytic baths are often applied to articles in order to provide them with one or more improved surface properties, including hardness, abrasion resistance, luster, reflectivity, color or other visual appearance, wear resistance, and lubricity, amongst others. Such coatings are also frequently provided on a material surface in order to improve corrosion resistance. This is generally required if the article will be exposed to, either in processing, storage, or use, an environment that might promote corrosive processes at one or more surfaces that are exposed to that environment. A common example in this regard is a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C25D5/18C25D3/56
CPCC25D3/562C25D5/18C25D5/12C25D5/617C25D5/619C25D5/627
Inventor SKLAR, GLENNLAI, ALANLUND, ALAN C.
Owner XTALIC CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com