Abstract: A method is provided for preventing copper and zinc from being eluted from a copper-alloy-made plumbing instrument that includes valves and pipe joints and suppresses copper and zinc from being eluted from the copper-alloy-made plumbing instrument while using for the plumbing instrument copper alloy as-is that includes bronze and brass, to provide a copper-alloy-made plumbing instrument using the method and to provide a film-forming agent. The method forms on at least a liquid-contact portion of the copper-alloy-made plumbing instrument a film of an organic substance comprising unsaturated fatty acid and coating with the film both copper and zinc in the surface layer of the liquid-contact portion of the plumbing instrument, thereby suppressing the elution of copper and zinc.

Abstract: This invention relates to a plumbing device made of a copper alloy containing nickel salt, that includes a valve and a tube coupling having at least a liquid-contacting part washed with a cleaning fluid incorporating therein nitric acid and hydrochloric acid as an inhibitor under conditions of a temperature and a duration permitting effective removal of nickel salt, thereby performing nickel salt-removing treatment and causing the hydrochloric acid to form a coating film on the surface of the liquid-contacting part thereby effectively precluding elution of nickel salt from the surface of the liquid-contacting part in the presence of the coating film, wherein the nitric acid has a concentration c in a range of 0.5 wt %<c<7 wt % and the hydrochloric acid has a concentration d in a range of 0.05 wt %<d<0.7 wt % in the cleaning fluid, wherein the temperature is set to 10° C.?x 50° C., and wherein nickel salt is removed with the cleaning fluid.

Abstract: A method is provided for preventing copper and zinc from being eluted from a copper-alloy-made plumbing instrument that includes valves and pipe joints and suppresses copper and zinc from being eluted from the copper-alloy-made plumbing instrument while using for the plumbing instrument copper alloy as-is that includes bronze and brass, to provide a copper-alloy-made plumbing instrument using the method and to provide a film-forming agent. The method forms on at least a liquid-contact portion of the copper-alloy-made plumbing instrument a film of an organic substance comprising unsaturated fatty acid and coating with the film both copper and zinc in the surface layer of the liquid-contact portion of the plumbing instrument, thereby suppressing the elution of copper and zinc.

Abstract: There are provide a nickel elution prevention method for preventing a water-contact instrument made of copper alloy from eluting nickel even when being water-contact with a fluid, such as city water, a protective film formation agent for preventing the elution of nickel and a detergent for preventing the elution of nickel. The water-contact instrument includes valves for city water, feedwater or hot water, pipe joints, strainers, water faucet clasps, pump supplies materials, water meters, water purifiers, water feeders, hot water feeders or other such water-contact instruments each made of copper alloy, such as bronze, brass, etc., plated with a material containing nickel, for example.

Abstract: This invention relates to a plumbing device made of a copper alloy containing nickel salt, that includes a valve and a tube coupling having at least a liquid-contacting part washed with a cleaning fluid incorporating therein nitric acid and hydrochloric acid as an inhibitor under conditions of a temperature and a duration permitting effective removal of nickel salt, thereby performing nickel salt-removing treatment and causing the hydrochloric acid to form a coating film on the surface of the liquid-contacting part thereby effectively precluding elution of nickel salt from the surface of the liquid-contacting part in the presence of the coating film, wherein the nitric acid has a concentration c in a range of 0.5 wt %<c<7 wt % and the hydrochloric acid has a concentration d in a range of 0.05 wt %<d<0.7 wt % in the cleaning fluid, wherein the temperature is set to 10° C.?x 50° C., and wherein nickel salt is removed with the cleaning fluid.

Abstract: There are provide a nickel elution prevention method for preventing a water-contact instrument made of copper alloy from eluting nickel even when being water-contact with a fluid, such as city water, a protective film formation agent for preventing the elution of nickel and a detergent for preventing the elution of nickel. The water-contact instrument includes valves for city water, feedwater or hot water, pipe joints, strainers, water faucet clasps, pump supplies materials, water meters, water purifiers, water feeders, hot water feeders or other such water-contact instruments each made of copper alloy, such as bronze, brass, etc., plated with a material containing nickel, for example.

Abstract: This invention relates to a plumbing device made of a copper alloy containing nickel salt, that includes a valve and a tube coupling having at least a liquid-contacting part washed with a cleaning fluid incorporating therein nitric acid and hydrochloric acid as an inhibitor under conditions of a temperature and a duration permitting effective removal of nickel salt, thereby performing nickel salt-removing treatment and causing the hydrochloric acid to form a coating film on the surface of the liquid-contacting part thereby effectively precluding elution of nickel salt from the surface of the liquid-contacting part in the presence of the coating film, wherein the nitric acid has a concentration c in a range of 0.5 wt %<c<7 wt % and the hydrochloric acid has a concentration d in a range of 0.05 wt %<d<0.7 wt % in the cleaning fluid, wherein the temperature is set to 10° C.?x 50° C., and wherein nickel salt is removed with the cleaning fluid.

Abstract: A technique is provided to precludes elution of the nickel by infallibly removing the nickel adhering to the inner surface of plumbing hardware, realize a treatment for efficient (treating temperature, treating duration, etc.) preclusion of both or either of lead and nickel and perform a neutralizing treatment on the varying fluid used in the treatment for precluding elution, thereby rendering the fluid usable as industrial water, permitting a generous cut in cost and allowing thorough observance of the influence on the environment.

Abstract: There are provide a nickel elution prevention method for preventing a wetted instrument made of copper alloy from eluting nickel even when being wetted with a fluid, such as city water, a protective film formation agent for preventing the elution of nickel and a detergent for preventing the elution of nickel. The wetted instrument includes valves for city water, feedwater or hot water, pipe joints, strainers, water faucet clasps, pump supplies materials, water meters, water purifiers, water feeders, hot water feeders or other such wetted instruments each made of copper alloy, such as bronze, brass, etc., plated with a material containing nickel, for example.

Abstract: A technique is provided to precludes elution of the nickel by infallibly removing the nickel adhering to the inner surface of plumbing hardware, realize a treatment for efficient (treating temperature, treating duration, etc.) preclusion of both or either of lead and nickel and perform a neutralizing treatment on the varying fluid used in the treatment for precluding elution, thereby rendering the fluid usable as industrial water, permitting a generous cut in cost and allowing thorough observance of the influence on the environment.