WO2004081257A1 - 鉛含有銅合金製水道用器具の製造方法、水道用器具の鋳造脱鉛品及び水道用器具 - Google Patents
鉛含有銅合金製水道用器具の製造方法、水道用器具の鋳造脱鉛品及び水道用器具 Download PDFInfo
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- WO2004081257A1 WO2004081257A1 PCT/JP2004/002320 JP2004002320W WO2004081257A1 WO 2004081257 A1 WO2004081257 A1 WO 2004081257A1 JP 2004002320 W JP2004002320 W JP 2004002320W WO 2004081257 A1 WO2004081257 A1 WO 2004081257A1
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- lead
- peripheral surface
- water
- copper alloy
- water supply
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/02—Plumbing installations for fresh water
- E03C1/04—Water-basin installations specially adapted to wash-basins or baths
Definitions
- the present invention relates to a method for producing a lead-containing copper alloy water supply device, a forged lead-free water supply device, and a water supply device.
- Copper alloys such as bronze and brass, which are lead-containing copper alloys, are used in faucet fittings, water pipes, and other water supply appliances from the viewpoint of corrosion resistance and machinability.
- such plumbing devices made of lead-containing copper alloys have been manufactured as follows. That is, as shown in FIG. 12, first, in a manufacturing process S90, a manufactured product made of a lead-containing copper alloy and having a water passage through which water passes and having a rough shape of a water supply device is obtained. Next, in a cutting step S92, the outer peripheral surface of the manufactured product is cut to obtain a cut product. Then, in the plating step S94, a plated product such as nickel or chrome plating is applied to the outer peripheral surface of the cut product mainly from the viewpoint of decorativeness to obtain a plated product.
- the general plating process S 94 includes a pre-treatment process S 95 for pre-treating the cut product, and a final plating process S 9 5 for applying a plating layer to the outer peripheral surface of the cut product after the pre-treatment process S 95. 6 and. More specifically, the pre-treatment step S95 has a degreasing step S95a for immersing the cut product in an alkaline solution to degrease the outer peripheral surface of the cut product and the inner peripheral surface of the water passage.
- the alkaline liquid used here is usually an alkaline aqueous solution in which sodium hydroxide or the like is dissolved in water. If the cut product is immersed in this liquid, degreasing is performed according to the pH of the liquid.
- the pretreatment step S95 includes, in addition to the degreasing step S95a, a cathodic electrolysis step S95b, which further performs degreasing of the outer peripheral surface of the cut product in a alkaline solution using the cut product as a cathode.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-9662688 discloses that before the final plating step S96, that is, after the cutting step S92.
- Patent Document 1 discloses that before the final plating step S96, that is, after the cutting step S92.
- the degreasing step S95a of the pretreatment step S95 a production method has been proposed in which immersion is performed in an alkaline liquid having a high pI-I. According to this manufacturing method, it seems that the amount of lead eluted into the water from the inner peripheral surface of the water passage can be reduced to some extent.
- Patent Document 2j WOO 2/3 6856 6 A1 (hereinafter referred to as “Patent Document 2j”) shows that, after the plating step S94, the plated product is converted into an activated alkaline solution as shown in FIG.
- a production method has been proposed in which a lead-free process S98 is performed to remove the lead from the inner peripheral surface of the water passage of the immersed and plated product.After the lead-free process S98, phosphoric acid or water is added to the water. It has also been proposed to carry out a film forming step S99 of forming a phosphorus-containing film on the inner peripheral surface of the water passage with a treatment liquid mainly containing a phosphate. The amount of lead eluted into water from the inner peripheral surface of the water channel can be reduced more reliably.
- the immersion step S96 shown in FIG. Lead is removed from the outer peripheral surface of the cut product and the inner peripheral surface of the water passage by etching, and cutting is performed.
- the present invention has been made in view of the above-described conventional circumstances, and has a lead-containing copper alloy tap water having an excellent appearance while sufficiently reducing the amount of lead eluting into the water from the inner peripheral surface of the water passage.
- the task to be solved is to be able to manufacture appliances for use. Means for solving the problem
- the method for producing a lead-containing copper alloy water supply device of the present invention comprises: a production process comprising a lead-containing copper alloy, having a water passage through which water is passed, and obtaining a rough product of the water supply device; A lead-containing copper alloy tap water provided with a cutting step of cutting the outer peripheral surface of the shaped article to obtain a cut article, and a plating step of applying a plating layer to the outer peripheral face of the cut article to obtain a plated article
- a production process comprising a lead-containing copper alloy, having a water passage through which water is passed, and obtaining a rough product of the water supply device
- a lead-containing copper alloy tap water provided with a cutting step of cutting the outer peripheral surface of the shaped article to obtain a cut article, and a plating step of applying a plating layer to the outer peripheral face of the cut article to obtain a plated article
- a lead removal step of immersing the article in a deleading liquid and performing a lead removal process on the outer peripheral surface of the article and the inner peripheral surface of the water passage is performed prior to the cutting step.
- the manufactured product is immersed in a deleading liquid before the cutting process, and the outer peripheral surface of the manufactured product and the inner peripheral surface of the water passage are subjected to a lead removal process.
- the lead product of the lead-containing copper alloy is de-leaded on the inner peripheral surface of the water passage through which water passes, and is also de-leaded on the outer peripheral surface.
- the inner peripheral surface of the water channel will have unevenness due to de-leading, and sufficiently reduce the amount of lead dissolved in water after it has been used as a product for water supply.
- the outer peripheral surface will have irregularities due to lead removal, but the irregularities will be smoothed by a later cutting process. For this reason, in the subsequent plating step, an excellent appearance is exhibited without applying a thick plating layer. Therefore, there is no significant cost increase.
- a lead-containing copper alloy water supply device having an excellent appearance is produced while sufficiently reducing the amount of lead dissolved into water from the inner peripheral surface of the water passage. Can be built.
- Japanese Patent Application Laid-Open No. 11-28987 discloses a manufacturing method for cleaning a part in contact with water with a cleaning solution containing an acid in a piping device made of a lead-containing copper alloy.
- the piping equipment as the product is likely to have unevenness on the outer peripheral surface, which is inferior in appearance.
- this manufacturing method does not always perform the plating step after cleaning, even if the plating step is performed, irregularities remain on the outer peripheral surface of the piping equipment in the case of the normal thickness of the plating layer.
- the outer peripheral surface of the piping equipment tends to have bad surface properties. For this reason, the plumbing equipment will impair the aesthetic appearance as in the case of the manufacturing method disclosed in Patent Document 1 described above.
- a thicker plating layer is applied to the outer peripheral surface of the cut product after cleaning, the production cost will also increase.
- lead is an amphoteric metal
- an acidic solution or an alkaline solution it is conceivable to use an acidic solution or an alkaline solution as the lead-free solution.
- a strong acid aqueous solution as the lead-free liquid.
- a hydrochloric acid aqueous solution, a sulfuric acid aqueous solution, an acetic acid aqueous solution, or the like can be used. If the lead removal solution is an aqueous hydrochloric acid solution, lead will be dissolved by the chemical reaction shown in the following chemical formula 1.
- so-called black scale or oxidized scale at the time of fabrication adheres to the outer peripheral surface of the fabricated product and the inner peripheral surface of the water passage.
- so-called black scale or oxidized scale at the time of fabrication adheres to the outer peripheral surface of the fabricated product and the inner peripheral surface of the water passage.
- sand remaining on the outer peripheral surface of the product may be dropped by shot blasting or the like, sand remaining on the inner peripheral surface of the water passage of the product is difficult to be dropped by such shot blasting.
- the strong acid aqueous solution in the de-leading process according to the present invention dissolves black scales and the like, even if black scales and the like remain on the outer circumferential surface and the inner circumferential surface of the water passage. Therefore, sand is also removed. Therefore, in the cutting step of cutting the outer peripheral surface, the cutting tool does not need to cut black scale or the like, and is not worn by sand. The same applies to the cutting of the inner peripheral surface of the water channel.
- the strong acid aqueous solution in the deleading step according to the present invention dissolves black scales and the like, thereby removing sand, and then performing a deleading process on the base material portion made of the lead-containing copper alloy.
- a low lead-containing layer that is integrated with the base material portion and has a lower lead concentration than the base material portion is formed.
- This low lead content layer lowers the machinability because the lead concentration is lower than that of the base material, but the low lead content layer lowers the machinability due to black scale, etc.
- the cutting process is almost always performed up to the base metal part, so that the reduction in machinability due to the low lead content layer is almost certainly not a problem.
- the plated product is immersed in a second deleading solution to perform a de-tinning treatment on the inner peripheral surface of the water passage of the plated product. It is preferable to carry out. As a result, the amount of lead eluted from the inner peripheral surface of the water passage into the water can be further reduced.
- the second lead removal process is performed after the plating process, the outer peripheral surface of the plated product is protected by the plating layer and lead is not removed, and the lead is further removed only from the inner peripheral surface of the water passage without the plating layer. The Rukoto. For this reason, the outer peripheral surface of the plated product does not have irregularities and the plated layer is not damaged, so that the outer peripheral surface of the water supply appliance maintains excellent surface properties. For this reason, the plumbing fixture has an excellent appearance.
- the active solution is an alkaline solution having a pH in the range of 12 to 14. According to the active alkaline solution having a pH in this range, the active alkaline solution is liable to undergo a chemical reaction with the lead on the inner peripheral surface, so that the lead is easily dissolved and removed.
- Such an active alkali solution is mainly an aqueous solution of sodium carbonate, sodium hydroxide, sodium phosphate, sodium metasilicate, sodium tripolyphosphate, sodium orcayate, and a hydroxylating agent.
- Such a second lead-free liquid may contain a surfactant. If the second lead-free liquid contains a surfactant, the surface tension of the second lead-free liquid can be reduced, so that the permeability and wettability of the second lead-free liquid to the inner peripheral surface of the water passage can be reduced. Can be improved. For this reason, a chemical reaction between the lead contained in the inner peripheral surface and the second deleading liquid is likely to occur.
- a surfactant an anionic surfactant / nonionic surfactant can be used.
- anionic surfactant for example, higher fatty acid sodium, sulfated oil, higher alcohol sodium sulfate, sodium alkyl benzene sulfate, higher sodium alkyl ether sulfate, sodium oleufin sulfate and the like can be used.
- Noeon surfactant for example, alkyl polyoxyethylene ether, alkylphenylpolyoxyethylene ether, fatty acid ethylene oxide adduct, polypropylene glycol ethylene oxide adduct and the like can be used.
- a chelating agent can be included in the second deleading liquid. Since the chelating agent undergoes a chemical reaction with lead to form a water-soluble complex, it is possible to easily remove lead contained in the inner peripheral surface of the water passage.
- chelating agent for example, ethylenediamine, thiourea, tartaric acid, Rossiel salt, EDTA, triethanolamine and the like can be used.
- an oxidizing agent may be included in the second deleading liquid.
- the second deleading solution which is an active solution
- the aqueous sodium hydroxide solution if only the aqueous sodium hydroxide solution is used to remove lead contained in the inner peripheral surface of the water passage, lead will be removed. Will be dissolved by the chemical reaction shown in the following chemical formula 2.
- the oxidizing agent is included in the second deleading solution, which is an active alkali solution, the oxidizing agent firstly undergoes a chemical reaction with lead as shown in the following chemical formula 3 to form lead oxide.
- the lead oxide dissolves in the second deleading liquid, which is an active liquid, and undergoes a chemical reaction shown in Chemical Formula 4 below, whereby a lead oxide salt is formed.
- oxidizing agent use, for example, sodium metanitrobenzenesulfonate, sodium parabenzoate, hypochlorite, bleached powder, hydrogen peroxide, potassium permanganate, persulfate, perchlorate, etc. Can be.
- a film forming step of forming a phosphorus-containing film on the inner peripheral surface of the water passage using a treatment liquid in which phosphoric acid or a phosphate is mainly added to water is performed.
- the film formed in the film forming process further prevents lead leaching.
- the coating may, for example, when using a treatment liquid composed mainly of the first zinc phosphate (Z n (H 2 P 0 4) 2) and phosphoric acid (H 3 PO 4), generated as follows It is thought that it is done.
- the lead may be dissolved in the treatment liquid by phosphoric acid to generate lead ions.
- zinc monophosphate is partially dissociated in the treatment solution, as shown in Chemical formula 7.
- a treatment liquid obtained by adding phosphoric acid or a phosphate mainly to water is used as a treatment liquid, and the phosphoric acid or the phosphate forms a chrome-plated layer.
- it is possible to dispose of the cleaning liquid or the waste liquid by simply neutralizing or diluting the cleaning liquid or the waste liquid after cleaning the workpiece after contacting the processing liquid. Therefore, compared with the disposal of chromate solution containing chromic acid as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2000-96270), the management of the cleaning solution and the like is simplified.
- the phosphoric acid according to the present invention a phosphorus pentoxide (P 2 O 5) a series of acid arising by hydration to varying degrees ( ⁇ 2 0 5 ⁇ ⁇ 2 ⁇ ).
- a phosphorus pentoxide P 2 O 5
- orthophosphoric acid H 3 P0 4 (0. 5 ⁇ 2 0 5 - 1. 5 ⁇ 2 0)
- metaphosphate HP0 3 (0. 5 ⁇ 2 0 5 ⁇ 0. 5 ⁇ 2 0)
- phosphate zinc phosphate, manganese phosphate, iron phosphate, zinc phosphate-calcium phosphate and the like can be used.
- the zinc phosphate, there etc. as a main component a first zinc phosphate (Zn (H 2 P0 4) 3 ⁇ 4).
- the chromium plating bath used in the present invention preferably contains a fluoride. This is because lead chromate formed in the copper plating bath may be dissolved by the fluoride.
- fluorides zinc fluoride, anorenium fluoride, antimony fluoride, ammonium fluoride, yttrium fluoride, uranium fluoride, chlorine fluoride, osmium fluoride, cadmium fluoride, potassium fluoride, fluoride Calcium, xenon fluoride, silver fluoride, chromium fluoride, silicon fluoride, germanium fluoride, cobalt fluoride, oxygen fluoride, cyanogen fluoride, bromine fluoride, zirconium fluoride, stannate fluoride, Strontium fluoride, thallium fluoride, tantalum fluoride, nitrogen fluoride, iron fluoride, copper fluoride, sodium fluoride, niobate fluoride, nickel fluor
- a faucet as a water supply device of the present invention can be obtained.
- the manufactured product is subjected to a de-leading process, a manufactured and de-leaded product of the water supply device of the present invention can be obtained.
- the forged lead-free product is made of a lead-containing copper alloy, has a water passage through which water flows, and forms a rough shape of a water supply appliance; an outer peripheral surface side of the base material and an inner periphery of the water passage.
- a low-lead-containing layer which is integral with the surface side and whose lead concentration is lower than that of the base material.
- the low lead content layer does not contain lead. If the low lead content layer does not contain lead, almost no lead will be eluted into the water passing through the water channel of the waterway device. After the outer peripheral surface of the forged lead-free product is cut, a plating layer is formed, thereby obtaining the water channel device of the present invention.
- This water supply device has a base material portion made of a lead-containing copper alloy having a water passage through which water flows, a damping layer formed on the outer peripheral surface side of the water passage, and a base material portion formed on the inner peripheral surface side of the water passage.
- FIG. 1 is a process chart of a method for producing a lead-containing copper alloy water supply device according to an embodiment.
- FIG. 2 is a longitudinal sectional view of a manufactured product according to the embodiment.
- FIG. 3 is an enlarged cross-sectional view of a portion A of the manufactured product shown in FIG. 2 according to the embodiment.
- FIG. 4 is a vertical cross-sectional view of an artificially lead-free product according to the embodiment.
- FIG. 5 is an enlarged cross-sectional view of part A of the artificial lead-free product shown in FIG. 4 according to the embodiment.
- FIG. 6 is a longitudinal sectional view of a cut product according to the embodiment.
- FIG. 7 is an enlarged cross-sectional view of part A of the cut product shown in FIG. 6 according to the embodiment.
- FIG. 8 is a longitudinal sectional view of a plated product according to the embodiment.
- FIG. 9 is an enlarged cross-sectional view of part A of the plated product shown in FIG. 8 according to the embodiment.
- FIG. 10 is an overall perspective view of a faucet fitting according to the embodiment.
- FIG. 11 is a process diagram of a method for manufacturing a water-supply device made of a tin-containing copper alloy according to a modified embodiment.
- FIG. 12 is a process chart of a method for manufacturing a general lead-containing copper alloy water supply device.
- FIG. 13 is a process chart of a method for manufacturing a lead-containing copper alloy water supply device of Patent Document 2. BEST MODE FOR CARRYING OUT THE INVENTION
- the water tool is manufactured through steps S10 to S60 shown in FIG.
- a JISCAC 406 (six kinds of bronze) is provided, which has a water passage 10a through which water passes to form the rough shape of the faucet fitting body.
- so-called black scale 21a at the time of construction is attached to the outer peripheral surface of the structure 10 and the inner peripheral surface of the water passage 10a as shown in FIG.
- the manufactured product 10 is immersed in a deleading liquid, and the outer peripheral surface and the water passage 10 of the manufactured product 10 are removed.
- De-leading the inner peripheral surface of a As a lead-free solution, a hydrochloric acid aqueous solution having a concentration of 5 to 7% and a temperature of 40 to 60 ° C. is used as a strong acid aqueous solution, and the product 10 is immersed in the hydrochloric acid aqueous solution for 2 to 4 minutes.
- the lead product 10 is de-leaded on the inner peripheral surface of the water passage 10a and is also de-leaded on the outer peripheral surface.
- the product 10 since a strong acid aqueous solution is used as the deleading liquid, the product 10 is not limited to lead existing on the inner and outer peripheral surfaces of the water passage 10a, but also on the outer peripheral surface. And lead that is deep from the inner circumferential surface of the water channel 10a.
- the hydrochloric acid aqueous solution of the deleading process S 20 may be removed from the outer peripheral surface and the inner peripheral surface of the water passage 10 a along with black scales 21 a even if black sand 21 b remains. Dissolve 21a, thereby removing sand 21b.
- this forged lead-free product 20 is made of a lead-containing copper alloy, has a water passage 10 a through which water passes, and has a base material portion 20 which forms a rough shape of the faucet fitting body. 1 and a low-lead-containing layer 2 2 having a lower lead concentration than the base material 21, forming an integral part on the inner peripheral side of the water passage 10 a in the base material 21, and an outer periphery of the base material 21 It consists of a low-lead-containing layer 23 having a lower lead concentration than the base material 21, which is integrated on the surface side.
- the low-lead-containing layer 22 that forms the inner peripheral surface of the water passage 10a generates irregularities due to deleading, and the amount of lead eluted into water after becoming a product faucet is sufficiently small. I do.
- the low lead content layer 23 forming the outer peripheral surface also has irregularities due to lead removal. Depending on the conditions of the strong acid aqueous solution, the low lead content layers 22 and 23 can be made free of lead. After the lead removal step S20, a water washing step is performed.
- a cutting step S30 shown in FIG. 1 the outer peripheral surface of the artificial lead-free product 20 is cut by about 1 mm to obtain a cut product 30 shown in FIG. At this time, the dimensions and shape of the valve seat and water outlet are also adjusted. As a result, as shown in FIG. 7, the low lead content layer 23 on the outer peripheral surface side having the unevenness is completely cut and smoothed. Further, since the black scale 21a and the sand 21b generated in the manufacturing step S10 are removed in the lead-free step S20, the cutting step S30 is easy. That is, in the cutting step S30 for cutting the outer peripheral surface, the cutting tool does not need to cut the black scale 21a or the like and does not wear due to sand 21b.
- the low lead content layer 23 on the outer peripheral surface lowers the machinability because the lead concentration is lower than that of the base metal part 21, but the decrease in machinability due to the low lead content layer 23 is as follows. There is almost no problem compared to the deterioration of machinability due to black scale etc. 21 a, and finally sand 21 b.
- the cutting step S30 since the cutting step S30 is performed up to the base metal part 21, the decrease in the machinability due to the low lead content layer 23 is almost certainly not a problem.
- a plating layer 24 is applied to the outer peripheral surface of the cut product 30 to obtain a plated product 40 shown in FIG. Fig. 1
- the method includes a pretreatment step S95 and a final plating step S96.
- the pretreatment step S95 has a degreasing step S95a, a cathodic electrolysis step S95b, an acid activation step S95c, and a water washing step provided between these steps.
- the degreasing step S95a the cut product 30 is immersed for 5 minutes in an alkaline liquid of pH 11 for degreasing the outer peripheral surface of the cut product 30 and the inner peripheral surface of the water passage 10a. I do.
- This alkaline liquid is an aqueous solution containing a few gZl of sodium hydroxide, a surfactant and a chelating agent, and its temperature is 40 ° C.
- the outer peripheral surface of the cut product 30 is further degreased by using the cut product 30 after the degreasing process S95a as a cathode in the same alkaline solution.
- the cut product 30 after the cathodic electrolysis step S95b is washed with a sulfuric acid aqueous solution at pH 2 at room temperature, and the outer peripheral surface of the cut product 30 and the water passage 10a Is activated on the inner peripheral surface.
- the cut product 30 is washed with water as a washing step.
- the final plating step S96 also has a nickel plating step and a chrome plating step.
- a nickel plating bath is used, and a nickel plating layer is applied to the outer peripheral surface of the cut product 30 after the acid activation step S95c.
- a chrome plating bath is used to apply a chrome plating layer to the outer peripheral surface of the cut product 30 after the nickel plating step.
- This chrome plating bath contains sodium fluoride of 5 to 10 g / 1 as a fluoride.
- chromic acid in the chromium plating bath causes a chemical reaction between chromic acid and lead, and lead contained in the inner peripheral surface of the water passage 10a is removed. At this time, it is considered that lead chromate formed in the chromium plating bath is dissolved by the fluoride. The washing process is performed between these processes.
- the plating step S40 does not require a thick plating layer 24. It will have an excellent appearance. Therefore, there is no significant cost increase.
- the plated product 40 is immersed in the second deleading solution for 10 minutes, and the outer peripheral surface of the plated product 40 and the inner circumference of the water passage 10a are immersed.
- the second deleading solution a strong alkaline aqueous solution of pH 14 is used.
- the second de-shipping liquid is an aqueous solution containing 50 gZl of sodium hydroxide, and its temperature is 50 ° C.
- the amount of lead eluted from the inner peripheral surface of the water passage 10a into the water can be further reduced.
- the second lead removal step S50 is performed after the plating step S40, the outer peripheral surface of the plated product 40 is protected by the plating layer 24 and lead is not removed, and the water passage 10a without the plating layer 24 is removed. Lead will be further removed only from the inner peripheral surface. Therefore, there is no unevenness on the outer peripheral surface of the plated product 40, and the plated layer 24 is not damaged.
- the second deleading solution is an active alkali solution, copper of the lead-containing copper alloy does not react, but only lead reacts.
- a film forming step S60 shown in FIG. 1 is performed.
- the plated product 40 after the second deleading step S50 is immersed in the processing solution for 10 minutes.
- the treatment liquid phosphoric acid (H 3 P 0 4) a 0.9 wt% aqueous solution, the temperature is 50. C.
- the treatment liquid reacts with copper and / or lead on the inner peripheral surface of the water passage 10a to form a phosphorus-containing film 25 on the inner peripheral surface of the water passage 10a as shown in FIG.
- water was also washed before and after the film forming step S60.
- a faucet fitting main body 50 in which the outer peripheral surface maintains excellent surface properties is obtained.
- the faucet fitting includes a base member 21 made of a lead-containing copper alloy having a water passage 10a through which water passes, and an Eckel® chrome formed on the outer peripheral surface side of the base member 21.
- the plating layer 24 and the base material 21 are integrated with the base material 21 on the inner peripheral surface side of the water passage 10 a, and the lower lead-containing layer 22 having a lower lead concentration than the base material 21 and the inner periphery of the low lead content layer 22.
- a low lead content layer 23 (see FIG. 5) having a lower lead concentration than the base material portion 21 may be left thin between the base material portion 21 and the Eckel-chrome plating layer 24. This faucet will be used by passing water through the water passage 10a.
- Test Example 1 a faucet manufactured by the manufacturing method of the above-described embodiment is used.
- Test Example 2 a faucet manufactured by performing the second deleading step S50 and the film forming step S60 twice in succession in the manufacturing method of the embodiment is used.
- Test Example 3 as shown in FIG. 11, in the manufacturing method of the embodiment, the faucet fitting manufactured without performing the second deleading step S50 and the film forming step S60 was used. I have.
- Comparative Example 1 a faucet manufactured by the general manufacturing method shown in FIG. 12 was used.
- Comparative Example 2 a faucet manufactured by performing the lead-free step S98 for 10 minutes in the manufacturing method 2 of Patent Document 2 shown in FIG. 13 is used. At that time, lead is removed using the second deleading solution in the manufacturing method of the above embodiment.
- Comparative Example 3 similarly to Comparative Example 2, a faucet manufactured by performing the lead removal step S98 for 15 minutes is used.
- Comparative Example 4 similarly to Comparative Example 2, a faucet fitting manufactured by performing a 10-minute lead-free step S98 and a 5-minute film-forming step S99 twice in succession was used. I have. Table 1 shows the results.
- the lead elution amount was less than the standard value of 0.007 (mgZl). Therefore, according to the manufacturing method of Test Examples 1 and 2, even if the faucet fitting has an unfavorably large content in order to clear the reference value, the water from the inner peripheral surface of the water passage 10a is It can be seen that while the amount of lead eluted is sufficiently reduced, an excellent appearance can be achieved.
- the amount of lead eluted was 0.007 (mg / 1) or more, and it was difficult to remove the lead by 0.007 (mg / 1) from the lead-free treatment alone. It is considered to be.
- the amount of lead eluted into water from the inner peripheral surface of the water passage 10a is sufficiently reduced so as to satisfy the reference value, It can be seen that a lead-containing copper alloy water supply device having an excellent appearance can be manufactured.
- the degreasing step S95a (see Fig. 11) By immersing, it is also possible to perform a lead removal process on the outer peripheral surface of the cut product 30 and the inner peripheral surface of the water passage 10a. If another lead removal step is performed after the cutting step S30, it is considered that lead will be further removed from the outer peripheral surface of the cut product 30 and the inner peripheral surface of the water passage 10a. However, if immersion in an alkaline solution with too high pH would impair the aesthetic appearance of the water supply equipment, it would be necessary to apply a thick plating layer 24 on the outer peripheral surface of the cut product 30. As a result, manufacturing costs will increase. Therefore, care must be taken in adjusting pH.
- the present invention is suitably embodied in a faucet fitting and a method for manufacturing the same.
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JP5473781B2 (ja) * | 2009-06-01 | 2014-04-16 | 株式会社Lixil | 鉛含有銅合金製水道用器具の製造方法及び処理方法 |
CN103143890A (zh) * | 2013-03-04 | 2013-06-12 | 阮伟光 | 低铅铜合金卫浴器具的制造方法 |
JP2018165406A (ja) * | 2018-04-20 | 2018-10-25 | 株式会社キッツ | 水栓金具又はバルブにおける銅合金製給水器材の製造方法 |
CN114606503A (zh) * | 2022-03-10 | 2022-06-10 | 杭州泛亚卫浴股份有限公司 | 一种龙头内腔粘沙清除液及粘沙处理方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999028536A1 (fr) * | 1997-12-03 | 1999-06-10 | Toto Ltd. | Procede attenuant l'elution du plomb des alliages de cuivre contenant du plomb, et accessoires de distribution d'eau de ville faits en alliage de cuivre contenant du plomb |
JPH11510217A (ja) * | 1995-08-03 | 1999-09-07 | エウロパ メタリ ソチエタ ペル アチオニ | 鉛放出性の低い鉛含有銅合金製配管部材およびその製造法 |
WO2002036856A1 (fr) * | 2000-10-31 | 2002-05-10 | Inax Corporation | Procede d'enlevement du plomb d'article cylindrique plaque en alliage de cuivre contenant du plomb et article metallique pour prise d'eau, procede pour empecher la dissolution du plomb d'un article en alliage de cuivre contenant du plomb et article metallique pour prise d'eau |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9409811D0 (en) * | 1994-05-17 | 1994-07-06 | Imi Yorkshire Fittings | Improvements in copper alloy water fittings |
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2004
- 2004-02-26 WO PCT/JP2004/002320 patent/WO2004081257A1/ja active Application Filing
- 2004-02-26 CN CNB2004800065636A patent/CN100441744C/zh not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11510217A (ja) * | 1995-08-03 | 1999-09-07 | エウロパ メタリ ソチエタ ペル アチオニ | 鉛放出性の低い鉛含有銅合金製配管部材およびその製造法 |
WO1999028536A1 (fr) * | 1997-12-03 | 1999-06-10 | Toto Ltd. | Procede attenuant l'elution du plomb des alliages de cuivre contenant du plomb, et accessoires de distribution d'eau de ville faits en alliage de cuivre contenant du plomb |
WO2002036856A1 (fr) * | 2000-10-31 | 2002-05-10 | Inax Corporation | Procede d'enlevement du plomb d'article cylindrique plaque en alliage de cuivre contenant du plomb et article metallique pour prise d'eau, procede pour empecher la dissolution du plomb d'un article en alliage de cuivre contenant du plomb et article metallique pour prise d'eau |
Also Published As
Publication number | Publication date |
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JP4430879B2 (ja) | 2010-03-10 |
CN100441744C (zh) | 2008-12-10 |
JP2004277793A (ja) | 2004-10-07 |
CN1759205A (zh) | 2006-04-12 |
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