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Composite electroless plating

a technology of electroless plating and composite materials, which is applied in the direction of transportation and packaging, chemical coatings, natural mineral layered products, etc., can solve the problems of reducing the use rate of such heavy metals, and reducing the wear and corrosion resistance of the coating, so as to prevent the decomposition of the plating bath, increase the plating rate, and reduce the plating rate

Inactive Publication Date: 2006-11-09
SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a process for electroless plating without the use of heavy metals. This is achieved by using particulate matter stabilizers to stabilize the plating bath and prevent instability caused by the addition of insoluble or sparingly soluble particulate matter. The use of heavy metals in the plating process has drawbacks such as decreased plating rate and reduced wear and corrosion resistance of coatings. The invention complies with regulations restricting or prohibiting the use of heavy metals and provides an environmentally friendly and cost-effective solution for electroless plating.

Problems solved by technology

However, the use of such heavy metals has drawbacks.
As explained in U.S. Pat. No. 6,306,466, increased concentration of heavy metals in electroless composite plating baths above a minimum level necessary for stabilization results in a diminished plating rate.
Therefore, resorting to thinner composite electroless coatings inherently reduces the coating's wear and corrosion resistance and consequently has limited the extent of applications for which composite electroless coatings can be commercially utilized.
In addition, the inclusion of insoluble particulate matter in composite electroless baths introduces additional instability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0046] Nickel-PTFE without Heavy Metals

[0047] A composite electroless nickel-PTFE bath was formulated. The bath included nickel salt providing a nickel metal concentration of 6 grams per liter in the plating bath, a reducing agent of sodium hypophosphate at a concentration of 30 grams per liter, an aqueous dispersion of PTFE particles and particulate matter stabilizers in a concentration of 3.6 grams of PTFE particles per liter of plating bath, and other components typical of electroless nickel baths, but free of any lead or other heavy metals. The plating bath was operated at the parameters of pH 4.8-5.0, temperature of 90 degrees Celsius, and mild stirring agitation.

[0048] A steel panel measuring 2 cm by 5 cm was prepared by an immersion in a hot (180 degrees Fahrenheit) alkaline cleaning solution for 10 minutes, rinse in water, immersion in a fifty percent by volume concentration of hydrochloric acid in water at 70 degrees Fahrenheit for 1 minute, rinse in water, and then immer...

example 2

[0055] Nickel-Diamond without Heavy Metals

[0056] A composite electroless nickel-diamond bath was formulated. The bath included nickel salt providing a nickel metal concentration of 6 grams per liter in the plating bath, a reducing agent of sodium hypophosphate at a concentration of 30 grams per liter, an aqueous dispersion of diamond particles and particulate matter stabilizers in a concentration of 6 grams per liter, and other components typical of electroless nickel baths, but free of any lead or other heavy metals. The plating bath was operated at the parameters of pH 4.8-4.9, temperature of 90 degrees Celsius, and mild stirring agitation.

[0057] A steel panel measuring 2 cm by 5 cm was prepared by an immersion in a hot (180 degrees Fahrenheit) alkaline cleaning solution for 10 minutes, rinse in water, immersion in a fifty percent by volume concentration of hydrochloric acid in water at 70 degrees Fahrenheit for 1 minute, rinse in water, and then immersion in the plating bath of...

example 3

[0060] Nickel-Aluminum Oxide without Heavy Metals

[0061] A composite electroless nickel-aluminum oxide bath was formulated. The bath included nickel salt providing a nickel metal concentration of 6 grams per liter in the plating bath, a reducing agent of sodium hypophosphate at a concentration of 30 grams per liter, an aqueous dispersion of aluminum oxide particles and particulate matter stabilizers in a concentration of 3.5 grams of particles per liter, and other components typical of electroless nickel baths, but free of any lead or other heavy metals. The plating bath was operated at the parameters of pH 4.8-4.9, temperature of 90 degrees Celsius, and mild stirring agitation.

[0062] A steel panel measuring 2 cm by 5 cm was prepared by an immersion in a hot (180 degrees Fahrenheit) alkaline cleaning solution for 10 minutes, rinse in water, immersion in a fifty percent by volume concentration of hydrochloric acid in water at 70 degrees Fahrenheit for 1 minute, rinse in water, and t...

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Abstract

This invention is a process for electrolessly metallizing an article to provide on the surface thereof a metal coating incorporating therein particulate matter, in which the process comprises contacting the surface of said article with an electroless metallizing bath essentially free of heavy metals, an electroless metallizing bath used in the process, and articles with coatings resulting from the process.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates in general to composite electroless plating, and more particularly, to a process of composite electroless plating without the intentional introduction of heavy metals, articles resulting from the process, and plating baths used in the process. [0002] The electroless plating of articles or substrates with a composite coating containing finely dispersed particulate matter is well documented. [0003] Electroless plating generally involves the deposition of metal alloys by chemical or electrochemical reduction of aqueous metal ions. Through such deposition, the process of electrolessly metallizing a desired metal coating over an article or substrate is achieved. [0004] The fundamentals of composite electroless plating are documented in a text entitled “Electroless Plating Fundamentals and Applications,” edited by G. Mallory and J. B. Hajdu, Chapter 11, published by American Electroplaters and Surface Finishers Society (1990...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C18/34
CPCC23C18/1662C23C18/38C23C18/32Y10T428/31678
Inventor LANCSEK, THOMAS S.FELDSTEIN, MICHAEL DAVID
Owner SURFACE TECH
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