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1. WO2004024987 - METHOD OF TREATMENT FOR REDUCING ELUTION OF LEAD FROM LEAD CONTAINING COPPER ALLOY AND WATERWORK UTENSILS MADE FROM LEAD CONTAINING COPPER ALLOY

Publication Number WO/2004/024987
Publication Date 25.03.2004
International Application No. PCT/JP2003/011093
International Filing Date 29.08.2003
IPC
C23C 22/08 2006.01
CCHEMISTRY; METALLURGY
23COATING 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
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
22Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
05using aqueous solutions
06using aqueous acidic solutions with pH < 6
07containing phosphates
08Orthophosphates
C23C 22/78 2006.01
CCHEMISTRY; METALLURGY
23COATING 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
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
22Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
78Pretreatment of the material to be coated
C23F 1/00 2006.01
CCHEMISTRY; METALLURGY
23COATING 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
FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES; INHIBITING CORROSION OF METALLIC MATERIAL; INHIBITING 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 C25247
1Etching metallic material by chemical means
CPC
C23C 22/08
CCHEMISTRY; METALLURGY
23COATING 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
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
22Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
05using aqueous solutions
06using aqueous acidic solutions with pH less than 6
07containing phosphates
08Orthophosphates
C23C 22/78
CCHEMISTRY; METALLURGY
23COATING 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
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
22Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
78Pretreatment of the material to be coated
C23F 1/00
CCHEMISTRY; METALLURGY
23COATING 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
FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE
1Etching metallic material by chemical means
Applicants
  • TOTO LTD. [JP]/[JP] (AllExceptUS)
  • KAWAMOTO, Masashi [JP]/[JP] (UsOnly)
  • ORITA, Mikio [JP]/[JP] (UsOnly)
  • GOTO, Akira [JP]/[JP] (UsOnly)
  • IMAMOTO, Mitsuo [JP]/[JP] (UsOnly)
Inventors
  • KAWAMOTO, Masashi
  • ORITA, Mikio
  • GOTO, Akira
  • IMAMOTO, Mitsuo
Agents
  • KOYAMA, Yuu
Priority Data
2002-25620730.08.2002JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) METHOD OF TREATMENT FOR REDUCING ELUTION OF LEAD FROM LEAD CONTAINING COPPER ALLOY AND WATERWORK UTENSILS MADE FROM LEAD CONTAINING COPPER ALLOY
(FR) PROCEDE DE TRAITEMENT DESTINE A REDUIRE L'ELUTION DE PLOMB DANS UN ALLIAGE DE CUIVRE CONTENANT DU PLOMB ET ELEMENTS D'ADDUCTION D'EAU FABRIQUES EN ALLIAGE DE CUIVRE CONTENANT DU PLOMB
(JA) 鉛含有銅合金の鉛溶出低減処理方法及び鉛含有銅合金製水道用器具
Abstract
(EN)
A method of treatment for reducing the elution of lead from a lead-containing copper alloy, characterized in that it comprises immersing the lead-containing copper alloy in an acidic solution which is free of chromic acid and contains a phosphoric acid or its derivative, to remove the lead in a surface portion thereof; and waterwork utensils made of a lead-containing copper alloy and treated by the method. The utensils having been treated by the method exhibit satisfactorily effective reduction in the elution of lead, and also are free from significant discoloration and from the reduction of its commercial value due to discoloration since only a little etching takes place owing to an acidic phosphoric acid or its derivative and only a fine phosphate film is formed. Further, sodium chloride may be added, the lead-containing copper alloy may be, in advance, immersed in an alkaline etching fluid, to remove the lead in a surface portion thereof, and the outer surface of the alloy may have been plated with a metal such as nickel-chromium.
(FR)
L'invention concerne un procédé de traitement destiné à réduire l'élution du plomb dans un alliage de cuivre contenant du plomb, caractérisé en ce qu'il consiste à immerger l'alliage de cuivre contenant du plomb dans une solution acide sans acide chromique et contenant de l'acide phosphorique ou un de ses dérivés, et à éliminer le plomb dans la partie de surface de l'alliage. L'invention concerne aussi des éléments d'adduction d'eau fabriqués à partir d'alliage de cuivre contenant du plomb et traités par ce procédé. Les éléments traités par ce procédé montrent une réduction effective satisfaisante de l'élution du plomb, ne se décolorent pas de façon importante, ce qui n'entraîne pas de réduction de la valeur commerciale due à la décoloration, seul s'étant produit un faible décapage dû à l'utilisation d'acide phosphorique ou de ses dérivés avec formation d'une couche mince de phosphate. On peut ajouter, en outre, du chlorure de sodium, l'alliage de cuivre contenant du plomb pouvant être immergé à l'avance dans un liquide alcalin de décapage afin d'éliminer le plomb en surface, la surface extérieure de l'alliage pouvant être recouvert par placage électrolytique d'un métal tel que le nickel-chrome.
(JA)
鉛含有銅合金を溶液中にクロム酸を含まずリン酸化合物を含む酸性溶液に浸漬し、表面の鉛を除去することを特徴とする鉛含有銅合金の鉛溶出低減処理方法及び鉛含有銅合金製水道用器具であるため、酸性のリン酸化合物による若干のエッチング効果と微小なリン酸皮膜が形成されるのみであるので大きな変色を伴うことなく、商品価値も低下しない。 また、塩化ナトリウムを添加してもよく、鉛溶出低減についても十分効果がある。前工程として、鉛含有銅合金をアルカリ性のエッチング液に浸漬して表面の鉛を除去してもよい。これらの鉛含有銅合金は外部表面が、ニッケルクロムめっきをはじめとするめっきが施されていても問題はない。
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