Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1979-04-20
1980-11-11
Massie, Jerome W.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
148 615R, 156656, 156657, 156664, 427305, 427336, C23F 100
Patent
active
042331072
ABSTRACT:
The invention provides a method of producing an ultra-black surface coating, having an extremely high light absorption capacity, on a substrate, such as a metal, ceramic, glass, or plastic, the blackness being associated with a unique surface morphology consisting of a dense array of microscopic pores etched into the surface, as well as the resulting coated substrate.
The method involves preparing the substrate for plating with a nickel-phosphorus alloy, as by cleaning and/or activating it, immersing the thus-prepared substrate in an electroless plating bath containing nickel and hypophosphite ions in solution until an electroless nickel-phosphorus alloy coating has been deposited on the substrate, and then removing the substrate, coated with the electroless nickel-phosphorus alloy, from the plating bath and washing and drying it.
The dried substrate, coated with the electroless nickel-phosphorus alloy, is then immersed in an etchant bath consisting of an aqueous solution of nitric acid, wherein the nitric acid concentration ranges from a 1:5 ratio with distilled or de-ionized water to concentrated, until the coated surface of the substrate develops ultra-blackness, the blackness being associated with the surface morphology as described above.
The resulting substrate, covered with the ultra-black coating is thereafter washed and dried.
The ultra-black surface, which has a spectral reflectance on the order of about from 0.5 to 1.0% at wavelengths of light of about from 320 to 2140 nanometers, finds use as a solar collector in the field of solar energy.
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patent: 4160049 (1979-07-01), Narcus
Pearlstein, "Electroless Plating" Modern Electroplating, John Wiley and Son nc., (1974) pp. 710-731.
Weast, Editor, Handbook Chemistry and Physics, The Chemical Rubber Co., Cleveland, Ohio (1967) pp. B-199.
Englert Alvin J.
Massie Jerome W.
Pawlikowski Eugene J.
The United States of America as represented by the Secretary of
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