JP2009504923A - マグネシウム基板の電気めっき前処理 - Google Patents
マグネシウム基板の電気めっき前処理 Download PDFInfo
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- JP2009504923A JP2009504923A JP2008526923A JP2008526923A JP2009504923A JP 2009504923 A JP2009504923 A JP 2009504923A JP 2008526923 A JP2008526923 A JP 2008526923A JP 2008526923 A JP2008526923 A JP 2008526923A JP 2009504923 A JP2009504923 A JP 2009504923A
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- Prior art keywords
- zinc
- magnesium alloy
- coating solution
- magnesium
- zinc coating
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- 239000000758 substrate Substances 0.000 title claims abstract description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims description 23
- 239000011777 magnesium Substances 0.000 title claims description 23
- 229910052749 magnesium Inorganic materials 0.000 title claims description 21
- 238000009713 electroplating Methods 0.000 title abstract description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 80
- 239000011701 zinc Substances 0.000 claims abstract description 80
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 80
- 238000000034 method Methods 0.000 claims abstract description 52
- 229910000861 Mg alloy Inorganic materials 0.000 claims abstract description 49
- 239000011248 coating agent Substances 0.000 claims abstract description 43
- 238000000576 coating method Methods 0.000 claims abstract description 43
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 24
- -1 fluoride ions Chemical class 0.000 claims abstract description 15
- 238000007654 immersion Methods 0.000 claims abstract description 15
- 235000011180 diphosphates Nutrition 0.000 claims abstract description 12
- 239000003792 electrolyte Substances 0.000 claims abstract description 10
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 6
- 230000008021 deposition Effects 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 38
- 238000007747 plating Methods 0.000 claims description 23
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 229910052783 alkali metal Inorganic materials 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000004070 electrodeposition Methods 0.000 claims description 6
- 150000003751 zinc Chemical class 0.000 claims description 6
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims description 5
- 150000004673 fluoride salts Chemical class 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 3
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 22
- 239000000956 alloy Substances 0.000 description 22
- 239000000047 product Substances 0.000 description 21
- 238000005266 casting Methods 0.000 description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 239000000203 mixture Substances 0.000 description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229940048084 pyrophosphate Drugs 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910001297 Zn alloy Inorganic materials 0.000 description 4
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000004913 activation Effects 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- RYCLIXPGLDDLTM-UHFFFAOYSA-J tetrapotassium;phosphonato phosphate Chemical compound [K+].[K+].[K+].[K+].[O-]P([O-])(=O)OP([O-])([O-])=O RYCLIXPGLDDLTM-UHFFFAOYSA-J 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- DOBRDRYODQBAMW-UHFFFAOYSA-N copper(i) cyanide Chemical compound [Cu+].N#[C-] DOBRDRYODQBAMW-UHFFFAOYSA-N 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 239000003599 detergent Substances 0.000 description 2
- XPPKVPWEQAFLFU-UHFFFAOYSA-N diphosphoric acid Chemical compound OP(O)(=O)OP(O)(O)=O XPPKVPWEQAFLFU-UHFFFAOYSA-N 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000011698 potassium fluoride Substances 0.000 description 2
- 235000003270 potassium fluoride Nutrition 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 2
- 229960001763 zinc sulfate Drugs 0.000 description 2
- 229910000368 zinc sulfate Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- PGTXKIZLOWULDJ-UHFFFAOYSA-N [Mg].[Zn] Chemical compound [Mg].[Zn] PGTXKIZLOWULDJ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009996 mechanical pre-treatment Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 229940005657 pyrophosphoric acid Drugs 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229940023144 sodium glycolate Drugs 0.000 description 1
- JEJAMASKDTUEBZ-UHFFFAOYSA-N tris(1,1,3-tribromo-2,2-dimethylpropyl) phosphate Chemical compound BrCC(C)(C)C(Br)(Br)OP(=O)(OC(Br)(Br)C(C)(C)CBr)OC(Br)(Br)C(C)(C)CBr JEJAMASKDTUEBZ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
-
- 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
- C23C—COATING 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
- C23C22/00—Chemical 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
- C23C22/05—Chemical 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 using aqueous solutions
- C23C22/60—Chemical 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 using aqueous solutions using alkaline aqueous solutions with pH greater than 8
-
- 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
- C23C—COATING 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
-
- 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
- C23C—COATING 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
-
- 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
- C23C—COATING 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
- C23C28/025—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/42—Pretreatment of metallic surfaces to be electroplated of light metals
Abstract
【解決手段】少量のフッ化物イオンを含有するピロリン酸系亜鉛電解液で被膜を形成し、マグネシウム合金の亜鉛及びアルミニウム含有量に従って、浸漬析出又は電気分解に亜鉛電解液を用いる。
【選択図】なし
Description
1)表面の機械的前処理、
2)有機溶媒又はアルカリ洗浄液を用いた脱脂、
3)マグネシウム合金基板の表面活性、
4)好ましくは60℃を超える温度で、亜鉛イオンを含有したアルカリ金属
ピロリン酸液を用いて、浸漬めっきを行う亜鉛の化学沈殿、及び
5)電解金属めっき処理
a)アルカリ洗浄剤でマグネシウム合金品を洗浄し、
b)浸漬析出又は電着により、洗浄したマグネシウム合金品上に亜鉛被覆液中で
亜鉛層を形成し、
c)亜鉛で被覆したマグネシウム表面に適合した電解液で金属被膜を形成する
工程からなる。
a)アルカリ洗浄剤でマグネシウム合金品を洗浄し、
b)電着により、洗浄したマグネシウム合金品上に亜鉛被覆液中で亜鉛層を
形成し、
c)亜鉛で被覆したマグネシウム表面に適合した電解液で金属被膜を形成する
工程からなる。
a)アルカリ洗浄剤でマグネシウム合金品を洗浄し、
b)浸漬析出又は電着により、洗浄したマグネシウム合金品上に亜鉛被覆液中で
亜鉛層を形成し、
c)亜鉛で被覆したマグネシウム表面に適合した電解液で金属被膜を形成する
アルカリ金属ピロリン酸塩、
亜鉛塩、及び
水可溶フッ化塩又はフッ化水素酸
から大体なる水溶液である。
a)アルカリ洗浄剤でマグネシウム合金品を洗浄し、
b)電着により、洗浄したマグネシウム合金品上に亜鉛被覆液中で亜鉛層を
形成し、
c)亜鉛で被覆したマグネシウム表面に適合した電解液で金属被膜を形成する
工程からなるマグネシウム合金品上に密着するめっき被膜を形成する方法にも関し、このマグネシウム合金品は約0〜9%のアルミニウム及び約6〜20%の亜鉛を含有する。
12.5%亜鉛、3.3%アルミニウム及び0.2%亜鉛の合金組成を有する研磨したマグネシウム鋳物のタップハンドルを、米国特許第4,349,390号明細書に記載された従来の前処理工程で処理した。
1.アセトン脱脂
2.すすぎ
3.周囲温度で1分、シュウ酸10g/lを含有する溶液に浸した
4.すすぎ
5.60℃で1分、ピロリン酸カリウム65g/l及び炭酸ナトリウム15g/lを含有する溶液に浸した
6.すすぎ
7.65℃で3分、硫酸亜鉛55g/l、ピロリン酸カリウム150g/l、フッ化カリウム7g/l、炭酸ナトリウム5g/lを含有する溶液に浸した
8.すすぎ
9.2A/dm2で15分、シアン化銅でめっきした
10.すすぎ
11.4A/dm2で20分、光沢ニッケルめっき溶液でめっきした
12.すすぎ
13.10A/dm2で6分、光沢クロムめっき溶液でめっきした
14.すすぎ
15.乾燥
比較例1と同様の合金組成を有する、研磨したマグネシウム鋳物のハンドルを、第7工程を除いて同様の処理工程で処理した。この工程では、同様の溶液組成で、浸漬めっきの代わりに電気分解で被膜を形成した。電流密度1A/dm2、温度60℃の条件下で5分間、電気分解を行った。
比較例1及び2と同様の合金組成を有する、研磨したマグネシウム鋳物のハンドルを、以下の工程で処理した。
2.すすぎ
3.硫酸亜鉛55g/l、ピロリン酸カリウム150g/l、フッ化カリウム7g/l、炭酸ナトリウム5g/lを含有する溶液中において、60℃、電流密度1A/dm2で5分めっきした
4.すすぎ
5.2A/dm2で15分、シアン化銅中でめっきした
6.すすぎ
7.4A/dm2で20分、光沢ニッケルめっき溶液でめっきした
8.すすぎ
9.10A/dm2で6分、光沢クロムめっき溶液でめっきした
10.すすぎ
11.乾燥
9%アルミニウム及び1%亜鉛の組成を有するマグネシウム合金鋳物AZ91の板を、実施例1に記載された工程で処理した。処理した後、合金を試験し、被膜上の広範囲で腫れが見られた。この実施例では、合金のアルミニウム含有量が高く、かつ、亜鉛含有量が低い場合には、記載された本発明のエッチングフリー処理工程を使用できないことが分かった。
0.5%亜鉛及び1%以下のアルミニウムの組成であるマグネシウム合金鋳物を、実施例1に記載された工程で処理した。
0.5%亜鉛及び1%未満のアルミニウムの組成を有するマグネシウム合金鋳物を、第3工程で電流を印加しないで亜鉛被膜を形成したこと以外については、実施例1に記載した工程で処理した。この場合においても、密着性及び外観性は優れていた。
実施例1に記載した工程で、異なる組成を有するマグネシウム合金を処理した。亜鉛被覆工程において電流を印加したもの、印加してないものに分けて、以下の表1にその試験結果を示す。
Claims (23)
- マグネシウム合金品に密着するめっき被膜を設ける方法であって、前記方法は
a)アルカリ洗浄剤でマグネシウム合金品を洗浄し、
b)浸漬析出又は電着により、洗浄したマグネシウム合金品上に亜鉛被覆液中で
亜鉛層を形成し、
c)亜鉛で被覆したマグネシウム表面に適合した電解液で金属被膜を形成する
工程からなり、マグネシウム合金は約0〜9%のアルミニウム及び約0.2〜20%の亜鉛を含有することを特徴とする方法。 - 亜鉛被覆液は、
アルカリ金属ピロリン酸塩、
亜鉛塩、及び
水可溶フッ化塩又はフッ化水素酸
からなる水溶液である請求項1に記載の方法。 - 約6から270g/lのピロリン酸イオンを与えるのに十分な量のアルカリ金属ピロリン酸塩が亜鉛被覆液に存在する請求項2に記載の方法。
- 約1から40g/lの亜鉛イオンを与えるのに十分な量の亜鉛塩が亜鉛被覆液に存在する請求項2に記載の方法。
- 約2〜80g/lのフッ化物イオンを与えるのに十分な量のフッ化塩又はフッ化水素酸が存在する請求項2に記載の方法。
- マグネシウム合金基板は約6〜20%の亜鉛を含有し、約0.5〜5.0A/dm2の陰極電流密度で電気分解して亜鉛層を形成する請求項1に記載の方法。
- 亜鉛被覆液のpHが約8から11の間である請求項2に記載の方法。
- 亜鉛被覆液の温度が約10〜100℃の間である請求項2に記載の方法。
- 亜鉛被覆液の温度が約40〜65℃の間である請求項8に記載の方法。
- 陰極電流密度が約0.5〜2.0A/dm2の間である請求項6に記載の方法。
- マグネシウム合金のアルミニウム含有量が約6%未満である請求項1に記載の方法。
- マグネシウム合金の亜鉛含有量が10%を超える請求項11に記載の方法。
- マグネシウム合金品に密着するめっき被膜を形成する方法であって、前記方法は
a)アルカリ洗浄剤でマグネシウム合金品を洗浄し、
b)電着により、洗浄したマグネシウム合金品上に亜鉛被覆液中で亜鉛層を
形成し、
c)亜鉛で被覆したマグネシウム表面に適合した電解液で金属被膜を形成する
工程からなり、マグネシウム合金は約0〜9%のアルミニウム及び約6〜20%の亜鉛を含有することを特徴とする方法。 - 亜鉛被覆液は、
アルカリ金属ピロリン酸塩、
亜鉛塩、及び
水可溶フッ化塩又はフッ化水素酸
からなる水溶液である請求項13に記載の方法。 - 約6から270g/lのピロリン酸イオンを与えるのに十分な量のアルカリ金属ピロリン酸塩が亜鉛被覆液に存在する請求項14に記載の方法。
- 約1から40g/lの亜鉛イオンを与えるのに十分な量の亜鉛塩が亜鉛被覆液に存在する請求項14に記載の方法。
- 約2〜80g/lのフッ化物イオンを与えるのに十分な量のフッ化塩又はフッ化水素酸が存在する請求項14に記載の方法。
- 約0.5〜5.0A/dm2の陰極電流密度で電気分解して亜鉛層を形成する請求項14に記載の方法。
- 陰極電流密度が約0.5〜2.0A/dm2である請求項18に記載の方法。
- 亜鉛被覆液のpHが約8から11の間である請求項14に記載の方法。
- 亜鉛被覆液の温度が約10〜100℃の間である請求項14に記載の方法。
- 亜鉛被覆液の温度が約40〜65℃の間である請求項21に記載の方法。
- マグネシウム合金のアルミニウム含有量が約6%未満である請求項13に記載の方法。
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JP2021123783A (ja) * | 2020-02-10 | 2021-08-30 | 新和メッキ工業株式会社 | めっき部材およびめっき部材の製造方法 |
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WO2007021327A3 (en) | 2007-09-20 |
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