JP6344269B2 - めっき方法 - Google Patents
めっき方法 Download PDFInfo
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- JP6344269B2 JP6344269B2 JP2015044836A JP2015044836A JP6344269B2 JP 6344269 B2 JP6344269 B2 JP 6344269B2 JP 2015044836 A JP2015044836 A JP 2015044836A JP 2015044836 A JP2015044836 A JP 2015044836A JP 6344269 B2 JP6344269 B2 JP 6344269B2
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- auxiliary electrode
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- 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
- C25D5/54—Electroplating of non-metallic surfaces
- C25D5/56—Electroplating of non-metallic surfaces of plastics
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1633—Process of electroless plating
- C23C18/1655—Process features
- C23C18/1664—Process features with additional means during the plating process
- C23C18/1671—Electric field
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1619—Apparatus for electroless plating
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1619—Apparatus for electroless plating
- C23C18/1628—Specific elements or parts of the apparatus
- C23C18/163—Supporting devices for articles to be coated
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1619—Apparatus for electroless plating
- C23C18/1632—Features specific for the apparatus, e.g. layout of cells and of its equipment, multiple cells
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1633—Process of electroless plating
- C23C18/1646—Characteristics of the product obtained
- C23C18/165—Multilayered product
- C23C18/1653—Two or more layers with at least one layer obtained by electroless plating and one layer obtained by electroplating
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- 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
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- 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
- C23F17/00—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
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/005—Contacting devices
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- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/06—Suspending or supporting devices for articles to be coated
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
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- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/10—Electrodes, e.g. composition, counter electrode
- C25D17/12—Shape or form
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/2006—Pretreatment of the material to be coated of organic surfaces, e.g. resins by other methods than those of C23C18/22 - C23C18/30
- C23C18/2046—Pretreatment of the material to be coated of organic surfaces, e.g. resins by other methods than those of C23C18/22 - C23C18/30 by chemical pretreatment
- C23C18/2073—Multistep pretreatment
- C23C18/2086—Multistep pretreatment with use of organic or inorganic compounds other than metals, first
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/22—Roughening, e.g. by etching
- C23C18/24—Roughening, e.g. by etching using acid aqueous solutions
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/28—Sensitising or activating
- C23C18/285—Sensitising or activating with tin based compound or composition
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
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- 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
- C25D5/60—Electroplating characterised by the structure or texture of the layers
- C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
- C25D5/611—Smooth layers
Description
このように製造される車両用装飾品では、その形状が複雑であったり、その表面に窪み部分が形成されていたりすると、電解めっき処理によって形成された金属被膜の各層の厚みが均質とならない場合がある。これは、電解めっき処理で金属被膜を形成する際、複雑な形状の内部や、窪み部分等では電気密度が低くなりやすく、当該部分での金属被膜が極端に薄くなってしまうことによる。このため、車両用装飾品全体での金属被膜が均質化されず、車両用装飾品としての外観形状が良好とはならないといった問題があった。
請求項3に記載の発明は、前記非導電性基材と前記補助電極は、搬送用の冶具に連結されており、前記無電解めっき工程、前記電解めっき工程の各工程間で、前記冶具に連結された状態で前記非導電性基材及び前記補助電極を移動させることを要旨とする。
上記構成によれば、補助電極からの導電層の剥離を効率的に行うことができる。
合成樹脂基材からなる非導電性基材に、無電解めっき処理によって導電性を付与する際、非導電性基材に補助電極を位置合わせした状態で無電解めっき処理を行うと、非導電性基材とともに補助電極も無電解めっき液に浸漬されて、非導電性基材上には導電性被膜が形成され、補助電極上にも導電層が形成される。この点、上記構成によれば、補助電極上に形成された導電層が、洗浄工程において剥離される。これにより、電解めっき工程への導電層の持ち込みが抑制され、電解めっき処理中に導電層が剥離する事態を抑制することができる。
以下、この発明を具体化した第一実施形態のめっき方法について説明する。ここでは、ABS樹脂からなる非導電性基材上に導電性被膜を形成して導電性を付与する無電解めっき工程と、導電性被膜上に各種機能を備えた金属被膜を積層する複数回の電解めっき工程とを備えた従来公知のめっき方法を例に挙げて説明する。本実施形態では、無電解めっき工程に特徴があることから、無電解めっき工程として無電解ニッケルめっき工程を例に挙げ、この部分を中心に説明する。なお、無電解めっきの種類、基材の材質等は、ここで説明する内容に限定されるものではなく、適宜変更することができる。
イオン交換膜23は、無電解ニッケルめっき液21中のニッケルイオンが金属電解板22に付着することを抑制するために設けられていることから、金属イオン(本実施形態では、ニッケルイオン)を通さない孔径を有するものを選択する。イオン交換膜23としては、陽イオン交換膜、陰イオン交換膜等従来公知のものを使用することができる。例えば、スルホ化されたテトラフルオロエチレンを基にしたフッ素樹脂の共重合体であるナフィオンを材料とした陽イオン交換膜を好適に挙げることができる。
非導電性基材11は、脱脂工程、エッチング工程、キャタリスト工程、アクセレータ工程等の一連の工程を経た後、無電解ニッケルめっき処理がなされる。したがって、非導電性基材11の表面は粗化されているとともに、表面に吸着された触媒が活性化して、無電解ニッケルめっき工程において、金属ニッケルが析出しやすい表面形状となっている。無電解ニッケルめっき液21に浸漬された非導電性基材11の表面には、無電解ニッケルめっき液21中に溶解しているニッケルイオンが吸着し、金属ニッケルとして析出する。これにより、非導電性基材11上には、非導電性基材11に導電性を付与する導電性被膜11aが形成される。
(1)無電解ニッケルめっき工程において、非導電性基材11には、導電性被膜11aが形成される一方、プラスに荷電している補助電極12には、金属ニッケルの析出が抑制されて導電層が形成されない。非導電性基材11にのみ選択的に金属ニッケルを析出させることができる。そして、導電性被膜が形成されていない補助電極12によれば、後に続く電解めっき工程への、金属ニッケルが析出した状態の補助電極12の持ち込みが回避される。したがって、無電解ニッケルめっき工程に続く電解めっき工程において、補助電極12を陽極側に接続し、非導電性基材11を陰極側に接続して通電しても、補助電極12から金属ニッケルが剥離する事態が回避される。非導電性基材11の導電性被膜11a上に、剥離片の付着による突起物の形成が抑制される。
次に、この発明を具体化した第二実施形態のめっき方法について説明する。ここでは、ABS樹脂からなる非導電性基材上に導電性被膜を形成して導電性を付与する無電解めっき工程と、各種機能を備えた金属被膜を積層する複数回の電解めっき工程とを備えた従来公知のめっき方法を例に挙げて説明する。本実施形態では、無電解めっき工程後の洗浄工程に特徴があることから、無電解めっき工程として無電解ニッケルめっき工程を例に挙げ、無電解ニッケルめっき工程、及び無電解ニッケルめっき工程後の洗浄工程を中心に説明する。また、第一実施形態と共通する部材については、同じ部材番号を付して説明する。なお、無電解めっきの種類、基材の材質等は、ここで説明する内容に限定されるものではなく、適宜変更することができる。
非導電性基材11及び補助電極12は、冶具13に一体に連結されて、脱脂工程、エッチング工程、キャタリスト工程、アクセレータ工程等の一連の工程を経た後、無電解ニッケルめっき処理がなされる。そのため、非導電性基材11の表面は粗化されているとともに、表面に吸着された触媒が活性化して、無電化ニッケルめっき工程において、金属ニッケルが析出しやすい表面状態となっている。また、一体物1として非導電性基材11とともに表面処理された補助電極12の表面も改質されている。このため、無電解ニッケルめっき液21に浸漬された非導電性基材11及び補助電極12の表面には、無電解ニッケルめっき液21中に溶解しているニッケルイオンが吸着し、金属ニッケルとして析出する。これにより、非導電性基材11上には、非導電性基材11に導電性を付与する導電性被膜11aが形成されるとともに、補助電極12上には、導電層12aが形成される。
(4)非導電性基材11及び補助電極12が一体化された状態で、脱脂工程、エッチング工程、キャタリスト工程、アクセレータ工程、無電解ニッケルめっき工程等の一連の前処理が行われることから、非導電性基材11上には、導電性被膜11aが形成され、補助電極12上には、導電層12aが形成される。しかし、無電解ニッケルめっき工程後の洗浄工程では、洗浄液31中に浸漬された補助電極12をプラスに荷電しているため、補助電極12上に付着された金属ニッケルが剥離して導電層12aがほぼ消失する。これにより、非導電性基材11にのみ選択的に導電性被膜11aが形成された状態となり、電解めっき工程への、金属ニッケルが析出した補助電極12の持ち込みが回避される。したがって、その後に続く電解めっき工程において、補助電極12を陽極側に接続し、非導電性基材11を陰極側に接続して通電しても、補助電極12から金属ニッケルが剥離する事態が回避され、非導電性基材11の導電性被膜11a上に、剥離片の付着による突起物の形成が抑制される。
・ 上記各実施形態では、無電解めっき工程として、無電解ニッケルめっき処理を例に挙げて説明したが、無電解銅めっき処理でもよく、或いは、他の無電解めっき処理でもよい。
図4に示すように、無電解ニッケルめっき液21で満たされた無電解ニッケルめっき槽2内に、SUS材からなる金属電解板22を浸漬するとともに、金属電解板22の周囲を、内部に金属イオンを含有しない電解液24で満たしたイオン交換膜23で被覆した。そして、Ti−Ptからなる補助電極12を無電解ニッケルめっき液21に浸漬し、金属電解板22を陰極とし、補助電極12を陽極として通電した。
まず、実験2の第1の検討事項として、無電解ニッケルめっき工程後の洗浄工程で使用する洗浄液31を選定する検討を行った。洗浄液31で満たされた洗浄槽3内に、SUS材からなる金属電解板32を浸漬し、補助電極12を陽極、金属電解板32を陰極に接続して通電し、補助電極12の通電性から洗浄液31として好適な電解液濃度の下限値を検討した。洗浄液31としては、水酸化ナトリウム水溶液と、硫酸の2種類を選択し、各濃度において電流値を変更してそのときの電圧値を測定した。このとき、電流値が1.0Aのときに、電圧値が15V以下であることを選択の目安とした。その結果を図7に示す。図7(a)は、洗浄液31として水酸化ナトリウム水溶液を使用した場合、図7(b)は、洗浄液31として硫酸を使用した場合である。
Claims (7)
- 非導電性基材上に導電性被膜を形成する無電解めっき工程と、前記非導電性基材の形状に応じて配置される補助電極を用いて前記導電性被膜上に金属被膜を形成する電解めっき工程を備えるめっき方法であって、
前記無電解めっき工程では、前記非導電性基材に前記補助電極を位置合わせした状態で、該非導電性基材を前記補助電極とともに無電解めっき液に浸漬して前記導電性被膜を形成し、
前記電解めっき工程では、前記非導電性基材に前記補助電極を位置合わせした状態で該非導電性基材を前記補助電極とともに電解めっき液に浸漬して前記金属被膜を形成し、
前記無電解めっき工程において、前記補助電極を陽極とし、前記無電解めっき液中に浸漬された導電部材を陰極として通電することを特徴とするめっき方法。 - 前記無電解めっき工程において、前記導電部材をイオン交換膜で被覆し、該イオン交換膜の内部を金属イオンを含まない電解液で満たす請求項1に記載のめっき方法。
- 前記非導電性基材と前記補助電極は、搬送用の冶具に連結されており、
前記無電解めっき工程、前記電解めっき工程の各工程間で、前記冶具に連結された状態で前記非導電性基材及び前記補助電極を移動させる請求項1又は2に記載のめっき方法。 - 基材上に導電性被膜を形成する前処理工程と、前記基材の形状に応じて配置される補助電極を用いて前記導電性被膜上に金属被膜を形成する電解めっき工程と、前記前処理工程と前記電解めっき工程との間で行われる洗浄工程を備えるめっき方法であって、
前記前処理工程では、前記基材に前記補助電極を位置合わせした状態で該基材上に前記導電性被膜を形成し、
前記洗浄工程では、前記基材に前記補助電極を位置合わせした状態で、該基材を補助電極とともに洗浄液に浸漬し、
前記電解めっき工程では、前記基材に前記補助電極を位置合わせした状態で、該基材を補助電極とともに電解めっき液に浸漬し、かつ、前記補助電極を陽極側に接続して前記導電性被膜上に前記金属被膜を形成し、
前記洗浄工程において、前記補助電極を陽極とし、前記洗浄液中に浸漬された導電部材を陰極として通電することを特徴とするめっき方法。 - 前記洗浄工程において、前記洗浄液を酸性電解液で構成する請求項4に記載のめっき方法。
- 前記基材は合成樹脂材料からなる非導電性基材であり、
前記前処理工程は、無電解めっき工程を備える請求項4又は5に記載のめっき方法。 - 前記基材と前記補助電極は、搬送用の冶具に連結されており、
前記前処理工程、前記洗浄工程、前記電解めっき工程の各工程間で、前記冶具に連結された状態で前記基材及び前記補助電極を移動させる請求項4乃至6のいずれか一項に記載のめっき方法。
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