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OwnerMasashi Kawamoto, Akira Gotou +1inventors
InventorsMasashi Kawamoto, Akira Gotou, Mituo Imamoto
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It is an object of the present invention to provide a processing method for preventing elution of lead in a lead-containing copper alloy to prevent lead from eluting from a faucet metal, etc. made of a lead-containing copper alloy, and a drinking water service fitting made of a lead-containing copper alloy in which elution of lead has been prevented. By forming a chromate film on the surface of a lead-containing copper alloy material, it is possible to reduce elution of the lead left in a limited amount on the surface. A drinking water service fitting made of a lead-containing copper alloy is immersed in an alkaline etching solution in a pre-processing step for a nickel chromium plating step to selectively remove lead on the surface of the lead-containing copper alloy material and is then activated in a solution such as sulfuric acid and hydrochloric acid. Nickel plating is subsequently effected, and then chromium plating is effected in a sargent chromium or chromium fluoride bath, and a chromate film may be formed by immersing the drinking water service fitting in a chromate solution.
(Amended) A processing method of reducing elution of lead from a lead-containing copper alloy, characterized by the step of immersing the lead-containing copper alloy in an alkaline etching solution to which an oxidant has been added to remove lead on the surface thereof.
(Amended) A processing method of reducing elution of lead from a lead-containing copper alloy, characterized by the step of immersing the lead-containing copper alloy in chromic acid solution to which fluoride has been added to remove lead on the surface thereof.
(Deleted)
(Amended) A processing method of reducing elution of lead from a lead-containing copper alloy, characterized by the step of immersing the lead-containing copper alloy in a chromate solution to which phosphoric acid has been added to form a chromate film on the surface thereof.
(Deleted)
(Amended) A processing method of reducing elution of lead from a lead-containing copper alloy, characterized by the step of immersing the lead-containing copper alloy in an alkaline etching solution to remove lead on the surface thereof, and subsequently immersing the same in a chromic solution to which fluoride has been added to remove lead on the surface thereof.
(Amended) A processing method of reducing elution of lead from a lead-containing copper alloy, characterized by the step of immersing the lead-containing copper alloy in an alkaline etching solution to which an oxidant has been added to remove lead on the surface thereof, and subsequently immersing the same in a chromate solution to form a chromate film on the surface thereof.
(Amended) A processing method of reducing elution of lead from a lead-containing copper alloy, characterized by the step of immersing the lead-containing copper alloy in chromic acid to which fluoride has been added to remove lead on the surface, and subsequently immersing the same in a chromate solution to form a chromate film on the surface thereof.
(Amended) A processing method of reducing elution of lead from a lead-containing copper alloy, characterized by the step of immersing the lead-containing copper alloy in an alkaline solution to selectively remove lead on the surface thereof, and then immersing the same in chromic acid solution to remove further lead on the surface thereof, and subsequently immersing the same in a chromate solution to which phosphoric acid has been added to form a chromate film on the surface thereof.
(Deleted)
(Amended) A drinking water service fitting made of a lead-containing copper alloy, characterized by the step of immersing a lead-containing copper alloy material in an alkaline etching solution to which an oxidant has been added to remove lead on the surface thereof.
(Amended) A drinking water service fitting made of a lead-containing copper alloy, characterized by the step of immersing a lead-containing copper alloy material in a chromic acid solution to which fluoride has been added to remove lead on the surface thereof.
(Amended) A drinking water service fitting made of a lead-containing copper alloy, characterized by the step of immersing a lead-containing copper alloy material in a chromate solution to which phosphoric acid has been added to form a chromate film on the surface thereof.
(Amended) A drinking water service fitting made of a lead-containing copper alloy, characterized by the step of immersing a lead-containing copper alloy material in an alkaline etching solution to which an oxidant has been added to remove lead on the surface thereof, and subsequently immersing the same in a chromate solution to form a chromate film on the surface thereof.
(Amended) A drinking water service fitting made of a lead-containing copper alloy, characterized by the step of immersing a lead-containing copper alloy material in an alkaline etching solution to remove lead on the surface thereof, and subsequently immersing the same in a chromic acid solution to which fluoride has been added to remove lead on the surface thereof.
(Amended) A drinking water service fitting made of a lead-containing copper alloy, characterized by the step of immersing a lead-containing copper alloy material in a chromic acid solution to which fluoride has been added to remove lead on the surface thereof, and subsequently immersing the same in a chromate solution to form a chromate film on the surface thereof.
(Amended) A drinking water service fitting made of a lead-containing copper alloy, characterized by the step of immersing a lead-containing copper alloy material in an alkaline solution to remove lead on the surface thereof, and then immersing the same in a chromic acid solution to remove lead on the surface thereof, and subsequently immersing the same in a chromate solution to which phosphoric acid has been added to form a chromate film on the surface thereof.
(Added) A plating method of reducing elution of lead from a lead-containing copper alloy for plating the outer surface of the lead-containing copper alloy and at the same time, removing lead on the inner surface thereof.
(Added) A drinking water service fitting made of a lead-containing copper alloy, characterized by the step of plating the outer surface of the lead-containing copper alloy and at the same time, removing lead on the inner surface thereof.
Dependencies are inferred from the claim text.