JP2017021956A - 燃料電池用通電部材、燃料電池セル、燃料電池スタック、及び燃料電池用通電部材の製造方法 - Google Patents
燃料電池用通電部材、燃料電池セル、燃料電池スタック、及び燃料電池用通電部材の製造方法 Download PDFInfo
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- plating layer
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- metal plating
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- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0223—Composites
- H01M8/0228—Composites in the form of layered or coated products
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- H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
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- 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
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Abstract
Description
本発明において、前記酸処理が、硫酸又は硝酸を用いた処理であることが好ましい。
本発明において、燃料電池用通電部材は、前記金属めっき層上に、金めっき層をさらに備えることが好ましい。
本発明において、前記基材が、鋼材又はアルミニウム材からなることが好ましい。
本発明において、前記燃料電池用通電部材は、燃料電池用セパレータまたは燃料電池用集電板であることが好ましい。
また、本発明によれば、上記の燃料電池用セルを複数積層してなる燃料電池スタックが提供される。
また、本発明によれば、基材上に、少なくとも一層の金属めっき層を形成する工程と、前記金属めっき層上に、金めっき層を形成する工程と、前記金属めっき層及び金めっき層を形成した基材に対して、保護膜形成剤を用いて保護膜形成処理を行う工程と、前記保護膜形成処理を行った基材に対して、酸処理を行う工程と、を有する燃料電池用通電部材の製造方法が提供される。
また、本発明によれば、基材と、前記基材上に形成された金属めっき層とを備え、前記金めっき層は、前記金めっき層の露出表面の少なくとも一部に、保護膜形成剤を用いて形成された保護膜を備え、前記基材は、前記基材の露出表面の少なくとも一部に、酸処理により形成された不動態皮膜を備える燃料電池用通電部材が提供される。
本実施形態の燃料電池用通電部材は、図4に示すような構成を有する表面処理基材10に対して、後述する保護膜形成剤を用いた保護膜形成処理と、酸処理とを、この順で行うことにより形成される。
基材11としては、特に限定されないが、鋼、ステンレス鋼、Al、Al合金、Ti、Ti合金、Cu、Cu合金、Ni、Ni合金などを、特に制限なく用いることができる。
本実施形態の基材11は、燃料電池用集電板の用途で用いられる場合、基材11の平板をプレス加工により所定の形状に形成する方法が挙げられる。
金属めっき層12は、基材11の表面に形成される層であり、図4に示すように、その上に金めっき層13を形成する場合には、金めっき層13を良好に形成するための下地層として作用する層である。あるいは、金めっき層13を形成しない場合には、燃料電池用通電部材の最表層を構成する層となる。なお、金属めっき層12は、1層のみでもよいし、2層以上としてもよく、また、2層以上とする場合には、各層を構成する成分は異なるものであってもよいし、あるいは、同じものであってもよい。
金めっき層13は、必要に応じて金属めっき層12上に形成される層であり、金属めっき層12上にめっき処理を施すことにより形成される。なお、めっき処理としては、無電解めっきが好ましく、無電解置換めっき処理、無電解還元めっき処理などが挙げられる。また、金めっき層13を形成する際には、例えば、無電解置換めっき処理を施し、さらに無電解還元めっき処理を施すことにより形成してもよい。本実施形態では、無電解めっきにより金めっき層13を形成することにより、上述したように予めガス流路が形成された基材を用いた場合においても、ガス流路を構成する凹凸部に対しても、金めっき層13を均一な状態で形成することができる。
まず、表面処理基材10を、保護膜形成剤で処理することで、図6に示すように、表面処理基材10における金属めっき層12が露出した部分の少なくとも一部に、保護膜14を形成する。すなわち、図6に示す要部拡大図のように、保護膜形成剤で処理することで、金めっき層13のピンホール等により、金属めっき層12において金属めっき層12が露出した部分に対し、保護膜形成剤が付着し、これにより、保護膜14が形成される。この際には、金属めっき層12の露出部分は、実質的に全体に保護膜14が形成されていることが好ましいが、保護膜14が形成されていない部分があってもよい。あるいは、本実施形態の表面処理基材10において、上述したように金めっき層13を形成しなかった場合には、金属めっき層12の表面に、保護膜14が形成される。この際には、金属めっき層12の表面は、実質的に全体に保護膜14が形成されていることが好ましいが、保護膜14が形成されていない部分があってもよい。
次いで、上述した保護膜14を形成した表面処理基材10に対して、酸処理を行う。本実施形態では、酸処理を行うことにより、図6に示す表面処理基材10における基材11が露出した部分の少なくとも一部に、図7に示すように、不動態皮膜111を形成する。すなわち、図7に示す要部拡大図のように、金属めっき層12のピンホール等により、基材11上に基材11が露出した部分がある場合には、その露出した部分が、酸処理により不動態化され、不動態皮膜111が形成される。この際には、基材11の露出部分は、実質的に全体に不動態皮膜111が形成されていることが好ましいが、不動態皮膜111が形成されていない部分があってもよい。
まず、基材11としてステンレス鋼材(SUS316L)を準備した。次いで、準備した基材11に対し、下記に示すパラジウムめっき浴と、ニッケルめっき浴とを、パラジウムめっき浴:ニッケルめっき浴=5.7:1(体積比)の割合で混合しためっき浴を用いて、38℃、4分間の条件で、無電解めっき処理を施すことにより、基材11上に、金属めっき層12として厚さ40nmのNi−Pd−P合金層を形成した。なお、めっき浴中におけるパラジウム塩、還元剤、および錯化剤については、従来公知の化合物を用いた。また、パラジウムめっき浴と、ニッケルめっき浴とを混合しためっき浴中におけるNi:Pd(モル比)は、1.14:1.0であった。
<パラジウムめっき浴>
パラジウム塩:パラジウムめっき浴中におけるPd量が0.15重量%となる量
還元剤:1.8重量%
錯化剤:0.63重量%
水:87.2重量%
pH:1.8
<ニッケルめっき浴>
ニッケル塩(硫酸ニッケル):1.8重量%
還元剤(次亜燐酸ソーダ):2.4重量%
錯化剤:2.4重量%
水:93.2重量%
pH:5.2
次いで、表面処理基材10に対し、耐食性の評価を行った。耐食性の評価は、具体的には、表面処理基材10を縦35mm、横30mmの面積が表裏に露出するように基材の端面をポリイミドテープでマスキングし、90℃の硫酸水溶液(体積80ml、pH:2)に100時間浸漬した後、表面処理基材10を取り出し、表面処理基材10から硫酸水溶液中に溶出したイオン(Ni、Pd、P)の濃度をICP(島津製作所社製、ICPE−9000)により測定することにより行った。結果を図10及び表1に示す。
次いで、実施例1において得られた表面処理基材10を用いて、図11に示すような測定系を形成し、次の条件にて、表面処理基材10の電気抵抗を測定した。なお、図11に示す測定系は、表面処理基材10の試験片、金めっき被覆された銅電極20、抵抗計30によって構成される。電気抵抗の測定は、具体的には、まず、表面処理基材10を幅20mm、長さ20mm、厚さ0.1mmの大きさに加工して得た試験片を、図11に示すように、金めっき被覆された銅電極20によって両側から挟んで固定することで、図11に示す測定系とした。次いで、銅電極20に1MPa荷重を加えながら、抵抗計(日置電機社製、ミリオームハイテスタ3540)を用いて、試験片を挟んだ金めっき被覆された銅電極20間の電気抵抗値を測定した。電気抵抗値は、試験片自体の導電性を示すものである。得られた測定結果を表2に示す。
上述した実施例1で用いたステンレス鋼材(SUS316L)を準備し、このステンレス鋼材について、金属めっき層12及び金めっき層13のいずれも形成することなく、そのまま、上述した耐食性の評価、及び電気抵抗の測定を行った。なお、耐食性の評価は、SUS316Lを縦50mm、横60mmの面積が露出するようにポリイミドテープでマスキングして評価を行った。また、電気抵抗の測定は、SUS316Lを、幅20mm、長さ20mm、厚さ0.1mmの大きさに加工して測定を行った。結果を図10及び表1,2に示す。
保護膜形成剤を用いた処理、及び酸処理をいずれも行わなかった以外は、実施例1と同様に表面処理基材10を作製し、同様に耐食性の評価を行った。結果を表1に示す。
酸処理を行わなかった以外は、実施例1と同様に表面処理基材10を作製し、同様に耐食性の評価を行った。結果を表1に示す。
上述した実施例1で用いたステンレス鋼材(SUS316L)を準備し、このステンレス鋼材を、0.049重量%(pH2)の硫酸水溶液に、90℃、24時間の条件で浸漬させて酸処理を行うことにより、ステンレス鋼材の表面に不動態皮膜111を形成し、その後、水洗した。
ステンレス鋼板の表面に形成した不動態皮膜111の表面について、X線光電子分光装置(アルバック・ファイ社製、型番:VersaProbeII)を用いて、Fe2p及びCr2pのピークをそれぞれ測定した。そして、得られたピークの面積から、各ピークの強度を求めた。結果を表3に示す。なお、表3においては、Fe2pのピークの強度と、Cr2pのピークの強度との合計が100となるように、各ピークの強度を求めた。
ステンレス鋼板に形成した不動態皮膜111の表面について、査型オージェ電子分光分析装置(日本電子社製、型番:JAMP−9500F)を用いて、Fe及びCrの原子%を測定し、得られた結果に基づいて、Cr/Fe値(Crの原子%/Feの原子%)を求めた。結果を表4に示す。
上述した参考例2と同じステンレス鋼材(SUS316L)を準備し、このステンレス鋼材について、酸処理を行うことなく、そのまま、上述したXPS測定及びAES測定を行った。結果を表3,4に示す。
酸処理を、濃度1重量%の硫酸水溶液を用いて、pH1以下、70℃、2分間の条件で浸漬させることで行った以外は、上述した実施例1と同様に表面処理基材10を作製した。そして、作製した表面処理基材10について、金めっき層13の剥離の有無を、目視にて確認した。結果を表5に示す。
酸処理を、濃度1重量%の硝酸水溶液を用いて、pH1、70℃、2分間の条件で浸漬させることで行った以外は、上述した実施例2と同様に表面処理基材10を作製し、同様に評価した。結果を表5に示す。
保護膜形成剤を用いた処理を行わなかった以外は、上述した実施例2と同様に表面処理基材10を作製し、同様に評価した。結果を表5に示す。
保護膜形成剤を用いた処理を行わなかった以外は、上述した実施例3と同様に表面処理基材10を作製し、同様に評価した。結果を表5に示す。
2…燃料電池セル
21…電解質膜
22…アノード
23…カソード
1A…燃料ガス流路
3C…酸化ガス流路
3…燃料電池スタック
31…燃料電池用通電部材(集電板)
10…表面処理基材
11…基材
111…不動態皮膜
12…金属めっき層
13…金めっき層
14…保護膜
Claims (10)
- 基材と、前記基材上に形成された少なくとも一層の金属めっき層と、を備える表面処理基材に対し、
保護膜形成剤を用いて、前記金属めっき層上に保護膜を形成した後、酸処理されてなる燃料電池用通電部材。 - 前記保護膜形成剤は、チオール基を有する化合物と、アゾール系化合物との混合物、及び/又はチオール基を有するアゾール系化合物を含むものである請求項1に記載の燃料電池用通電部材。
- 前記酸処理が、硫酸又は硝酸を用いた処理である請求項1又は2に記載の燃料電池用通電部材。
- 前記金属めっき層上に、金めっき層を、さらに備える請求項1〜3のいずれか一項に記載の燃料電池用通電部材。
- 前記基材が、鋼材又はアルミニウム材からなる請求項1〜4のいずれか一項に記載の燃料電池用通電部材。
- 前記燃料電池用通電部材が燃料電池用セパレータまたは燃料電池用集電板である請求項1〜5のいずれか一項に記載の燃料電池用通電部材。
- 請求項1〜6のいずれか一項に記載の燃料電池用通電部材を用いてなる燃料電池セル。
- 請求項7に記載の燃料電池用セルを複数積層してなる燃料電池スタック。
- 基材上に、少なくとも一層の金属めっき層を形成する工程と、
金属めっき層を形成した基材に対して、保護膜形成剤を用いて保護膜形成処理を行う工程と、
前記保護膜形成処理を行った基材に対して、酸処理を行う工程と、を有する燃料電池用通電部材の製造方法。 - 基材上に、少なくとも一層の金属めっき層を形成する工程と、
前記金属めっき層上に、金めっき層を形成する工程と、
前記金属めっき層及び金めっき層を形成した基材に対して、保護膜形成剤を用いて保護膜形成処理を行う工程と、
前記保護膜形成処理を行った基材に対して、酸処理を行う工程と、を有する燃料電池用通電部材の製造方法。
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- 2016-06-16 WO PCT/JP2016/067991 patent/WO2017006741A1/ja active Application Filing
- 2016-06-16 KR KR1020177037658A patent/KR20180027437A/ko not_active Application Discontinuation
- 2016-06-16 EP EP16821211.6A patent/EP3322013B1/en active Active
- 2016-06-16 CA CA2991692A patent/CA2991692A1/en not_active Abandoned
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2021020064A1 (ja) * | 2019-07-31 | 2021-02-04 | 昭和電工株式会社 | 積層体およびその製造方法 |
CN113874551A (zh) * | 2019-07-31 | 2021-12-31 | 昭和电工株式会社 | 层叠体及其制造方法 |
CN113874551B (zh) * | 2019-07-31 | 2023-10-03 | 株式会社力森诺科 | 层叠体及其制造方法 |
US12031213B2 (en) | 2019-07-31 | 2024-07-09 | Resonac Corporation | Laminate |
Also Published As
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EP3322013A1 (en) | 2018-05-16 |
JP6587848B2 (ja) | 2019-10-09 |
US20180198152A1 (en) | 2018-07-12 |
WO2017006741A1 (ja) | 2017-01-12 |
CN107851811A (zh) | 2018-03-27 |
EP3322013A4 (en) | 2019-03-13 |
EP3322013B1 (en) | 2020-03-04 |
CN107851811B (zh) | 2021-03-09 |
KR20180027437A (ko) | 2018-03-14 |
US10847830B2 (en) | 2020-11-24 |
CA2991692A1 (en) | 2017-01-12 |
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