JP2003223902A - Manufacturing method of separator for fuel cell, and manufacturing equipment for this - Google Patents
Manufacturing method of separator for fuel cell, and manufacturing equipment for thisInfo
- Publication number
- JP2003223902A JP2003223902A JP2002022436A JP2002022436A JP2003223902A JP 2003223902 A JP2003223902 A JP 2003223902A JP 2002022436 A JP2002022436 A JP 2002022436A JP 2002022436 A JP2002022436 A JP 2002022436A JP 2003223902 A JP2003223902 A JP 2003223902A
- Authority
- JP
- Japan
- Prior art keywords
- separator
- treatment
- metal material
- surface layer
- electrolytic etching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0206—Metals or alloys
- H01M8/0208—Alloys
- H01M8/021—Alloys based on iron
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
- C25F3/06—Etching of iron or steel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M2008/1095—Fuel cells with polymeric electrolytes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Sustainable Energy (AREA)
- Sustainable Development (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金属製セパレータ
の生産向上及びコスト削減を図るのに好適な燃料電池用
セパレータの製造方法及び同製造装置に関する。に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for manufacturing a fuel cell separator, which is suitable for improving the production of metal separators and reducing costs. Regarding
【０００２】[0002]
【従来の技術】固体高分子電解質型燃料電池は、各燃料
電池セルを複数積層することで所望の出力を得る構造で
あるため、各燃料電池セルを仕切るセパレータとして
は、樹脂材料に比較して積層時の加圧力に対する強度や
積層後の小型化が有利な金属材料が有力視されている。2. Description of the Related Art A solid polymer electrolyte fuel cell has a structure in which a plurality of fuel cells are stacked to obtain a desired output. Therefore, as a separator for partitioning each fuel cell, compared to a resin material. Metallic materials, which are advantageous in strength against pressure applied during lamination and miniaturization after lamination, are considered promising.
【０００３】このような金属製セパレータを採用する燃
料電池としては、例えば、特開平８−１８０８８３号
公報「固体高分子電解質型燃料電池」、特開２０００
−１６４２２８「固体高分子電解質型燃料電池のセパレ
ータおよびその製造方法」が知られている。Fuel cells employing such a metal separator are disclosed, for example, in Japanese Unexamined Patent Publication No. 8-180883 "Solid Polymer Electrolyte Fuel Cell" and Japanese Unexamined Patent Publication 2000.
-164228 "Solid Polymer Electrolyte Fuel Cell Separator and Manufacturing Method Thereof" is known.
【０００４】上記の図３には、固体高分子電解質膜５
１（符号については、同公報に記載されているものを使
用した。以下同様。）の両側にそれぞれ電極膜７Ａ，７
Ｂを配置し、これらの電極膜７Ａ，７Ｂを、例えばステ
ンレス鋼製のセパレータ４，４で挟み、セパレータ４，
４の縁部をシール体３１，３２でシールした燃料電池の
単電池３が記載されている。In FIG. 3 above, the solid polymer electrolyte membrane 5 is shown.
1 (the reference numerals used are those described in the publication. The same applies to the following).
B is placed, and these electrode films 7A and 7B are sandwiched by, for example, stainless steel separators 4 and 4,
A unit cell 3 of a fuel cell in which the edge portion of No. 4 is sealed with seal bodies 31 and 32 is described.
【０００５】上記の図９には、固体高分子膜２（符号
については、同公報に記載されているものを使用した。
以下同様。）の両側にアノード電極３及びカソード電極
４を配置し、これらのアノード電極３及びカソード電極
４を、例えばステンレス鋼を基材としたセパレータ５，
６で挟んだ燃料電池の単電池１が記載されている。In FIG. 9 described above, the solid polymer film 2 (the reference numerals used are those described in the same publication).
The same applies below. ), The anode electrode 3 and the cathode electrode 4 are arranged on both sides of the separator 5, and the anode electrode 3 and the cathode electrode 4 are connected to the separator 5 made of, for example, stainless steel.
A fuel cell unit cell 1 sandwiched between 6 is described.
【０００６】上記，の公報の技術では、セパレータ
の材料となるステンレス鋼を所定の板厚とするために、
例えばステンレス鋼に冷間圧延を実施した場合、ステン
レス鋼の表層部には圧延によって、酸化物や、ステンレ
ス鋼板に含まれていた金属間化合物が砕かれて粒径の小
さくなったもの等からなる異常層が形成される。この異
常層は導電性が良くないため、セパレータの電気的な接
触抵抗を小さくするために除去する必要がある。そこ
で、このようなステンレス鋼の異常層を除去する工程を
設けたセパレータの製造方法が考えられた。この技術を
以下に説明する。In the technique of the above-mentioned publication, in order to make the stainless steel as the material of the separator a predetermined plate thickness,
For example, when cold rolling is performed on stainless steel, the surface layer of the stainless steel is formed by rolling, and oxides and intermetallic compounds contained in the stainless steel are crushed to reduce the grain size. An abnormal layer is formed. Since this abnormal layer has poor conductivity, it needs to be removed in order to reduce the electrical contact resistance of the separator. Then, the manufacturing method of the separator provided with the process of removing such an abnormal layer of stainless steel was considered. This technique will be described below.
【０００７】図７は従来の金属製セパレータの製造要領
を説明する説明図であり、順に説明する。
１．異常層除去
セパレータの材料となる金属材料１００を所定形状にプ
レス成形する前に圧延する。金属材料１００を圧延する
と、金属材料１００の表層に異常層１０１が形成され
る。FIG. 7 is an explanatory view for explaining the manufacturing procedure of a conventional metal separator, which will be described in order. 1. The metal material 100, which is a material of the abnormal layer removing separator, is rolled before being press-formed into a predetermined shape. When the metal material 100 is rolled, the abnormal layer 101 is formed on the surface layer of the metal material 100.
【０００８】２．異常層除去エッチング
プレス成形の後、エッチング処理により上記した異常層
１０１を除去する。
３．第１不動態化処理
金属材料１００の表面の腐食を防止するために第１不動
態化処理を実施し、第１不動態皮膜１０２を形成する。
４．頭出しエッチング
金属材料１００内に含有する粒状の導電物１０３・・・（・
・・は複数個を示す。以下同様。）の頭出しを行うため
に、エッチング処理を実施する。
５．第２不動態化処理
導電物１０３の頭出しの後、金属材料１００の表面が腐
食しないように第２不動態化処理を実施し、第２不動態
皮膜１０５を形成する。これで、セパレータの製造が完
了する。以上に説明したセパレータの製造方法を次図で
詳細に説明する。2. Abnormal Layer Removal After the etching press molding, the above-mentioned abnormal layer 101 is removed by an etching process. 3. The first passivation treatment is performed to prevent corrosion of the surface of the first passivation-treated metal material 100, and the first passivation film 102 is formed. 4. Granular conductors 103 contained in the cue etching metal material 100 ((
・ ・ Indicates more than one. The same applies below. ), The etching process is performed to perform the cueing. 5. After the second passivation conductor 103 is cued, the second passivation process is performed so that the surface of the metal material 100 is not corroded, and the second passivation film 105 is formed. This completes the manufacture of the separator. The method of manufacturing the separator described above will be described in detail with reference to the following drawings.
【０００９】図８は従来の金属製セパレータの製造工程
を説明するフロー図である。なお、ＳＴ×××はステッ
プ番号を示す。
ＳＴ１０１…圧延の後にプレス成形した金属材料を脱脂
する。処理時間は１分である。
ＳＴ１０２…金属材料を水洗する。処理時間は１分であ
る。FIG. 8 is a flow chart for explaining the manufacturing process of a conventional metal separator. Note that STXXX shows a step number. ST101 ... The metal material press-formed after rolling is degreased. The processing time is 1 minute. ST102 ... Wash the metal material with water. The processing time is 1 minute.
【００１０】ＳＴ１０３…圧延時に形成された異常層を
エッチング処理にて除去する。処理時間は６０分であ
る。
ＳＴ１０４…金属材料を水洗する。処理時間は１分であ
る。ST103 ... The abnormal layer formed during rolling is removed by etching. The processing time is 60 minutes. ST104: The metal material is washed with water. The processing time is 1 minute.
【００１１】ＳＴ１０５…金属材料の表面の腐食を防止
するために第１不動態化処理を実施する。処理時間は３
０分である。
ＳＴ１０６…金属材料を水洗する。処理時間は１分であ
る。ST105 ... A first passivation treatment is carried out to prevent corrosion of the surface of the metal material. Processing time is 3
0 minutes. ST106 ... Wash the metal material with water. The processing time is 1 minute.
【００１２】ＳＴ１０７…金属材料中の導電物の頭出し
のためにエッチング処理を実施する。処理時間は１０分
である。
ＳＴ１０８…金属材料を水洗する。処理時間は１分であ
る。ST107 ... An etching process is carried out in order to find the beginning of the conductive material in the metal material. The processing time is 10 minutes. ST108 ... Wash the metal material with water. The processing time is 1 minute.
【００１３】ＳＴ１０９…金属材料の表面の腐食を防止
するために第２不動態化処理を実施する。処理時間は３
０分である。
ＳＴ１１０…金属材料を水洗する。処理時間は１分であ
る。
ＳＴ１１１…金属材料を乾燥させる。処理時間は１分で
ある。
これで、セパレータの製造が完了する。処理時間の合計
は１３７分である。ST109 ... A second passivation treatment is carried out to prevent corrosion of the surface of the metal material. Processing time is 3
0 minutes. ST110 ... Wash the metal material with water. The processing time is 1 minute. ST111 ... Dry the metal material. The processing time is 1 minute. This completes the manufacture of the separator. The total processing time is 137 minutes.
【００１４】上記セパレータの製造方法では、エッチン
グ処理により化学的に異常層を除去し、更にエッチング
処理により導電物の頭出しを行うことで、セパレータの
接触抵抗を小さくしている。In the above-mentioned method for manufacturing a separator, the contact resistance of the separator is reduced by chemically removing the abnormal layer by an etching process and then performing an etching process to locate the conductor.
【００１５】[0015]
【発明が解決しようとする課題】しかし、上記図８にお
いて、ＳＴ１０１の脱脂からＳＴ１１１の乾燥までの所
要時間は合計で１３７分であり、処理工程数が多いため
に各処理液の種類や処理液を貯める処理槽の数が多くな
るとともに各処理液の温度管理にも多くの工数が掛かる
ため、金属製セパレータの生産性向上及びコスト削減を
図るために、上記処理工程数の削減が求められている。However, in FIG. 8, the time required from the degreasing of ST101 to the drying of ST111 is 137 minutes in total, and since the number of processing steps is large, the type of each processing solution and the processing solution are different. Since the number of treatment tanks for storing the metal is large and many man-hours are required to control the temperature of each treatment liquid, it is required to reduce the number of treatment steps described above in order to improve the productivity and cost of the metal separator. There is.
【００１６】本発明の目的は、燃料電池用セパレータの
製造方法及び同製造装置を改良することで、金属製セパ
レータの生産向上及びコスト削減を図ることにある。It is an object of the present invention to improve the production method and the production apparatus of a fuel cell separator to improve the production of a metal separator and reduce the cost.
【００１７】[0017]
【課題を解決するための手段】上記目的を達成するため
に請求項１は、セパレータ用金属材料を圧延手段で圧延
する工程と、圧延材をプレス手段で所定形状に成形する
工程と、先の圧延工程で発生していた異常表層部を除去
するとともに金属材料自体の表層部に含む導電物の一部
を突出させて頭出しする工程と、金属材料自体の表層部
に不動態化処理を施す工程とからなり、異常表層部を除
去し導電物を頭出しする工程を電解エッチング処理で行
うとともに、この電解エッチング処理の工程と不動態化
処理の工程とを電位制御により連続して実施することを
特徴とする。In order to achieve the above object, a first aspect of the present invention comprises a step of rolling a separator metal material by a rolling means, a step of forming a rolled material into a predetermined shape by a pressing means, and A step of removing the abnormal surface layer part that occurred in the rolling process and projecting a part of the conductive material contained in the surface layer part of the metal material itself so as to locate it and passivating the surface layer part of the metal material itself The step of removing the abnormal surface layer portion and exposing the conductor is performed by electrolytic etching, and the step of electrolytic etching and the step of passivation are continuously performed by potential control. Is characterized by.
【００１８】従来、セパレータ用金属材料の異常表層部
の除去、導電物の頭出し及び不動態化処理を別々な工程
で行っていたものを、本発明では、電位制御により連続
して少ない工程で実施することにより、処理工程数を減
らすことができて、処理時間を短縮することができ、金
属製セパレータの生産性を高めるとともに製造コストを
削減することができる。Conventionally, the removal of the abnormal surface layer of the metallic material for the separator, the cueing of the conductive material, and the passivation treatment are carried out in separate steps. By carrying out, the number of processing steps can be reduced, the processing time can be shortened, the productivity of the metal separator can be improved, and the manufacturing cost can be reduced.
【００１９】請求項２は、電位制御を、金属材料を陽極
にするとともにこの陽極に対向させた電極を負極とする
ときに、電解エッチング処理では陽・負極間の電位差を
大きくし、不動態化処理では陽・負極間の電位差を小さ
くすることを特徴とする。According to a second aspect of the present invention, in the potential control, when a metal material is used as an anode and an electrode facing the anode is used as a negative electrode, the potential difference between the positive and negative electrodes is increased in the electrolytic etching process to passivate. The treatment is characterized by reducing the potential difference between the positive and negative electrodes.
【００２０】電解エッチング処理のときには、電位差を
大きくして過不動態なる状態を形成することで、金属材
料の異常表層部及び金属材料自体の表層部を除去し易く
するようにして導電物の頭出しを容易にし、不動態化処
理のときには、電位差を小さくして不動態なる状態を形
成することで、金属材料への不動態皮膜の形成を容易に
することができる。During the electrolytic etching process, the potential difference is increased to form a state of overpassivity, thereby facilitating removal of the abnormal surface layer portion of the metal material and the surface layer portion of the metal material itself so that the conductive material head is removed. It is possible to facilitate the formation of the passivation film on the metal material by facilitating the discharge and reducing the potential difference during the passivation treatment to form a passivated state.
【００２１】請求項３は、電解エッチング処理では、陽
・負極間の電位差を大きくするとともに電流密度を一定
に保つようにすることを特徴とする。例えば、電位差を
大きくするとともに電位差を一定とした場合には、電解
エッチング処理の時間経過に伴って、金属材料の表面に
過不動態域での皮膜が次第に形成され、電流が流れなく
なって電解エッチング処理の反応が遅くなるが、本発明
のように電流密度を一定に保つように電位制御すること
により、電解エッチング処理の反応を良好に持続させる
ことができる。According to a third aspect of the present invention, in the electrolytic etching treatment, the potential difference between the positive and negative electrodes is increased and the current density is kept constant. For example, when the potential difference is made large and the potential difference is made constant, a film in the passivation region is gradually formed on the surface of the metal material with the lapse of time of the electrolytic etching process, and the current stops flowing and the electrolytic etching is stopped. Although the reaction of the treatment becomes slow, the reaction of the electrolytic etching treatment can be favorably maintained by controlling the potential so as to keep the current density constant as in the present invention.
【００２２】請求項４は、セパレータ用金属材料を圧延
手段で圧延し、圧延材をプレス手段で所定形状に成形
し、電解エッチング処理にて圧延工程で発生していた異
常表層部を除去するとともに金属材料自体の表層部に含
む導電物の一部を突出させて頭出しを行い、金属材料自
体の表層部に不動態化処理を施すことでセパレータを製
造する燃料電池用セパレータの製造装置であって、この
製造装置を、金属材料を電解エッチング処理するために
処理液を満たすとともに処理液内に電極を設けた処理槽
と、この処理槽内の処理液に浸した金属材料、電極間に
給電する給電手段と、この給電手段で給電中の電流密度
を検知する電流密度検知手段と、この電流密度検知手段
で検知した電流密度に応じて金属材料、電極間の電位差
を制御する電位制御手段と、所定時間の給電を行うため
に電位制御手段に時間信号を送るタイマとから構成す
る。従来に比べて、より簡単な構成でセパレータを製造
することができ、セパレータの製造装置のコストを低減
することができる。According to a fourth aspect of the present invention, the separator metal material is rolled by rolling means, the rolled material is formed into a predetermined shape by pressing means, and the abnormal surface layer portion generated in the rolling step is removed by electrolytic etching. A separator for a fuel cell that manufactures a separator by projecting part of the conductive material contained in the surface layer of the metal material itself so as to find the cue, and applying a passivation treatment to the surface layer of the metal material itself. In this manufacturing apparatus, a processing tank is filled with a processing solution for electrolytically etching a metal material and an electrode is provided in the processing solution, and a metal material immersed in the processing solution in the processing tank and a power supply between the electrodes are supplied. Power supply means, a current density detection means for detecting the current density during the power supply by this power supply means, and a potential control for controlling the potential difference between the metal material and the electrode according to the current density detected by the current density detection means. It consists a stage, a timer to send a time signal to the voltage control means for feeding current for a predetermined time. The separator can be manufactured with a simpler structure than the conventional one, and the cost of the separator manufacturing apparatus can be reduced.
【００２３】[0023]
【発明の実施の形態】本発明の実施の形態を添付図に基
づいて以下に説明する。なお、図面は符号の向きに見る
ものとする。図１は本発明に係る燃料電池用セパレータ
の製造装置を示す説明図であり、セパレータ製造装置１
０は、後述するセパレータ製造に関する各処理を行うた
めにその処理液を貯めた第１処理槽１１〜第４処理槽１
４及び乾燥を行う乾燥機１７と、これらの第１処理槽１
１〜第４処理槽１４及び乾燥機１７の位置へセパレータ
になる金属材料としてのセパレータ素材２０を搬送する
搬送装置２１と、セパレータ素材２０を第１処理槽１１
〜第４処理槽１４の各処理液に浸けるために第１処理槽
１１〜第４処理槽１４をそれぞれ上下動させる第１昇降
装置３１〜第４昇降装置３４と、第１処理槽１１〜第４
処理槽１４内の各処理液の温度を調整する液温調整装置
３６・・・（この液温調整装置３６は第１処理槽１１〜第
４処理槽１４のそれぞれに備えるが、図では第１処理槽
１１にのみ描いた。）と、第３処理槽１３内の処理液に
挿入した電極（詳細は後述する。）及び同じく第３処理
槽１３内の処理液に浸けたセパレータ素材２０に給電す
る給電手段としての給電装置３７と、これらの乾燥機１
７、搬送装置２１、第１昇降装置３１〜第４昇降装置３
４、液温調整装置３６及び給電装置３７を制御する電位
制御手段としての制御装置３８とからなる。なお、３１
ｄ〜３４ｄは第１昇降装置３１〜第４昇降装置３４のそ
れぞれを駆動させる昇降駆動部、４１は制御装置３８に
備えたタイマである。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of the reference numerals. FIG. 1 is an explanatory view showing a manufacturing apparatus for a fuel cell separator according to the present invention.
0 denotes a first processing tank 11 to a fourth processing tank 1 that store the processing liquid for performing each processing related to the separator manufacturing described later.
4 and a dryer 17 for drying, and a first treatment tank 1 for these.
A conveying device 21 that conveys a separator material 20 as a metal material to be a separator to the positions of the first to fourth processing tanks 14 and the dryer 17, and the separator material 20 to the first processing tank 11
~ First elevating device 31 to fourth elevating device 34 for vertically moving the first treatment tank 11 to the fourth treatment tank 14 so as to be immersed in each treatment liquid of the fourth treatment tank 14, and the first treatment tank 11 to the first treatment tank 11 Four
A liquid temperature adjusting device 36 that adjusts the temperature of each processing liquid in the processing tank 14 (this liquid temperature adjusting device 36 is provided in each of the first processing tank 11 to the fourth processing tank 14; Power is supplied to the processing tank 11 only), electrodes inserted into the processing liquid in the third processing tank 13 (details will be described later), and the separator material 20 which is also immersed in the processing liquid in the third processing tank 13. Power supply device 37 as a power supply means for controlling
7, transport device 21, first lifting device 31 to fourth lifting device 3
4, a liquid temperature adjusting device 36 and a control device 38 as a potential control means for controlling the power supply device 37. 31
Reference characters d to 34d are lift drive units that drive the first lift device 31 to the fourth lift device 34, respectively, and 41 is a timer included in the control device 38.
【００２４】上記した第１処理槽１１は脱脂槽、第２処
理槽１２・第４処理槽１４は水洗のための洗浄槽、第３
処理槽１３は電解エッチング処理・不動態化処理槽（詳
細は後述する。）である。The above-mentioned first processing tank 11 is a degreasing tank, the second processing tank 12 and the fourth processing tank 14 are cleaning tanks for washing with water, and the third processing tank is a third cleaning tank.
The processing tank 13 is an electrolytic etching processing / passivation processing tank (details will be described later).
【００２５】セパレータ素材２０は、上記のセパレータ
製造装置１０によって最終的にセパレータとなるもので
あり、金属材料、例えば、ステンレス鋼（特に、オース
テナイト系ステンレス鋼）を薄板に圧延し、この後に燃
料電池における燃料ガス、酸化剤ガス、冷却水を通す各
溝、穴等をプレス成形したものである。The separator material 20 is to finally become a separator by the separator manufacturing apparatus 10 described above, and a metal material, for example, stainless steel (in particular, austenitic stainless steel) is rolled into a thin plate, and then the fuel cell is used. The grooves, holes, etc. through which the fuel gas, the oxidant gas, and the cooling water in FIG.
【００２６】乾燥機１７は、制御装置３８からのオンオ
フ信号により作動又は停止する装置であり、セパレータ
素材２０に、例えば送風又は放熱することでセパレータ
素材２０を乾燥させる。搬送装置２１は、第１処理槽１
１〜第４処理槽１４及び乾燥機１７の上方に配置したも
のであり、第１電動モータ４３で駆動する第１ドラム４
４と、第２電動モータ４５で駆動する第２ドラム４６
と、これらの第１ドラム４４及び第２ドラム４６のそれ
ぞれに渡したケーブル４７と、このケーブル４７の途中
に取付けたセパレータ搬送部４８とからなる。The dryer 17 is a device that is activated or stopped by an on / off signal from the control device 38, and dries the separator material 20 by, for example, blowing or radiating heat to the separator material 20. The transfer device 21 is the first processing tank 1
The first drum 4 is arranged above the first to fourth processing tanks 14 and the dryer 17 and is driven by the first electric motor 43.
4 and the second drum 46 driven by the second electric motor 45.
And a cable 47 passed to each of the first drum 44 and the second drum 46, and a separator transport unit 48 attached in the middle of the cable 47.
【００２７】セパレータ素材２０を搬送するには、制御
装置３８で第１電動モータ４３及び第２電動モータ４５
を同期するように回転させ、第１ドラム４４及び第２ド
ラム４６を回転させて、セパレータ素材２０を吊るした
セパレータ搬送部４８を移動させる。タイマ４１は、第
３処理槽１３で実施する電解エッチング処理及び不動態
化処理の処理時間の設定のための時間信号を制御装置３
８に供給するものである。In order to convey the separator material 20, the control device 38 uses the first electric motor 43 and the second electric motor 45.
Are rotated in synchronism with each other, the first drum 44 and the second drum 46 are rotated, and the separator transport unit 48 that suspends the separator material 20 is moved. The timer 41 outputs a time signal for setting the processing time of the electrolytic etching process and the passivation process performed in the third processing tank 13, to the control device 3.
8 is supplied.
【００２８】図２は本発明に係るセパレータの処理状態
を示す説明図であり、セパレータ素材２０に対して、例
えば、第３処理槽１３の下部に設けた第３昇降装置３３
を駆動させて第３処理槽１３を上昇させ、セパレータ素
材２０を第３処理槽１３に満たした処理液４９に浸けた
状態を示す。FIG. 2 is an explanatory view showing a processing state of the separator according to the present invention. For the separator material 20, for example, a third lifting device 33 provided below the third processing tank 13 is provided.
Is driven to raise the third treatment tank 13 and the separator material 20 is immersed in the treatment liquid 49 filled in the third treatment tank 13.
【００２９】セパレータ素材２０は、Ｔ字状のセパレー
タ取付部材５２に締結具５３，５３で取付けたものであ
り、このセパレータ取付部材５２はセパレータ搬送部４
８にワイヤ５４を介して取付ける。５５はセパレータ素
材２０に接触するようにセパレータ取付部材５２に設け
た接点部であり、給電装置３７から給電する部分であ
る。The separator material 20 is attached to a T-shaped separator mounting member 52 with fasteners 53, 53, and the separator mounting member 52 is attached to the separator conveying section 4.
8 through wire 54. Reference numeral 55 is a contact portion provided on the separator mounting member 52 so as to come into contact with the separator material 20, and is a portion to which power is supplied from the power supply device 37.
【００３０】５７，５７は処理液４９に浸すように第３
処理槽１３に設けた電極であり、これらの電極５７，５
７と上記したセパレータ素材２０に給電装置３７から給
電することで、第３処理槽１３にて、セパレータ素材２
０を対象として後述する電解エッチング処理及び不動態
化処理を実施する。給電は、セパレータ素材２０が陽
極、電極５７，５７が負極となるように直流電源として
の給電装置３７に接続して行う。Numerals 57 and 57 are third soaked in the processing liquid 49.
These electrodes 57, 5 are electrodes provided in the processing tank 13.
7 and the separator material 20 described above are supplied from the power supply device 37 to the separator material 2 in the third processing tank 13.
An electrolytic etching process and a passivation process, which will be described later, are performed for 0. Power is supplied by connecting the separator material 20 to a power supply device 37 as a DC power supply so that the separator material 20 serves as an anode and the electrodes 57, 57 serve as a negative electrode.
【００３１】５８は、給電装置３７からセパレータ素材
２０及び電極５７，５７に給電するときの電流値を検出
する電流計を備えるとともに、この電流計で検出した電
流値と一方の極板５７の表面積とから単位面積当たりの
電流値、即ち電流密度を得る電流密度検知手段としての
電流密度検知装置である。６１は、気泡を連続して形成
することにより処理液４９を撹拌させるために第３処理
槽１３の底に配置したエア撹拌装置である。The reference numeral 58 is provided with an ammeter for detecting the current value when the power is supplied to the separator material 20 and the electrodes 57, 57 from the power supply device 37, and the current value detected by this ammeter and the surface area of one electrode plate 57 are provided. It is a current density detecting device as a current density detecting means for obtaining a current value per unit area, that is, a current density. Reference numeral 61 is an air agitator arranged at the bottom of the third treatment tank 13 for agitating the treatment liquid 49 by continuously forming bubbles.
【００３２】ここで、７２，７２は第３処理槽１３内に
配置したヒータ、７３はヒータ７２，７２用の電源、７
４は処理液４９の温度を検知する温度センサであり、こ
の温度センサ７４からの温度信号を液温調整装置３６に
送ることにより、液温調整装置３６は電源７３からヒー
タ７２，７２への通電を制御し、処理液４９の温度を所
定温度に調整する。Here, 72 and 72 are heaters arranged in the third treatment tank 13, 73 is a power source for the heaters 72 and 72, and 7
Reference numeral 4 denotes a temperature sensor that detects the temperature of the treatment liquid 49. By sending a temperature signal from the temperature sensor 74 to the liquid temperature adjusting device 36, the liquid temperature adjusting device 36 causes the power source 73 to energize the heaters 72, 72. Is controlled to adjust the temperature of the treatment liquid 49 to a predetermined temperature.
【００３３】第３昇降装置３３は、ベース部７６と、こ
のベース部７６に一端をスイング可能に取付けるととも
に第３処理槽１３の下部に設けた処理槽受け部７７に他
端をスライド可能に取付けた第１バー７８，７８（奥側
の第１バー７８は不図示）と、ベース部７６に一端をス
ライド可能に取付けるとともに処理槽受け部７７にスイ
ング可能に取付けた第２バー７９，７９（奥側の第２バ
ー７９は不図示）と、第１バー７８，７８又は第２バー
７９，７９を駆動する図示せぬシリンダ装置とからなる
パンタグラフ型昇降装置である。なお、図１に示した第
１昇降装置３１、第２昇降装置３２及び第４昇降装置３
４も上記した第３昇降装置３３と同一構造である。The third elevating device 33 has a base portion 76, one end swingably attached to the base portion 76, and the other end slidably attached to the processing bath receiving portion 77 provided at the lower portion of the third processing bath 13. The first bars 78, 78 (the first bar 78 on the far side is not shown) and the second bars 79, 79 (slidingly attached to the base portion 76 and swingably attached to the processing tank receiving portion 77). The second bar 79 on the back side is a pantograph-type lifting device including a second bar 79 (not shown) and a cylinder device (not shown) that drives the first bars 78, 78 or the second bars 79, 79. The first lifting device 31, the second lifting device 32, and the fourth lifting device 3 shown in FIG.
4 also has the same structure as the third elevating device 33 described above.
【００３４】図３は本発明に係るセパレータの製造方法
を説明するフロー図である。なお、ＳＴ××はステップ
番号を示す。
ＳＴ０１…セパレータ素材を脱脂する。処理時間は１分
である。
ＳＴ０２…セパレータ素材を水洗する。処理時間は１分
である。FIG. 3 is a flow chart for explaining the method of manufacturing the separator according to the present invention. Note that STXX indicates a step number. ST01 ... Degrease the separator material. The processing time is 1 minute. ST02: The separator material is washed with water. The processing time is 1 minute.
【００３５】ＳＴ０３…セパレータ素材に形成されてい
る異常表層部の除去及びセパレータ素材の表層部に含む
導電物の頭出しのために電解エッチング処理を実施す
る。処理液はリン酸３０％、硫酸２５％、硝酸１０％、
過酸化水素水５％、界面活性剤１％、残り水（それぞれ
の単位は重量％である。）からなる溶液、処理液の温度
は４０℃、セパレータ素材と電極とに給電中の電流密度
は１８Ａ／ｄｍ2一定、撹拌方法はエア撹拌、処理時間
は１０分である。ST03 ... An electrolytic etching process is carried out to remove the abnormal surface layer portion formed on the separator material and to locate the conductive material contained in the surface layer portion of the separator material. Treatment liquid is 30% phosphoric acid, 25% sulfuric acid, 10% nitric acid,
A solution consisting of 5% hydrogen peroxide, 1% surfactant, and the remaining water (each unit is% by weight), the temperature of the treatment liquid is 40 ° C., and the current density during power supply to the separator material and the electrode is 18 A / dm 2 is constant, the stirring method is air stirring, and the processing time is 10 minutes.
【００３６】ＳＴ０４…セパレータ素材と電極との電位
差を１Ｖ一定として、セパレータ素材の表面に不動態化
処理を実施し、不動態皮膜を形成する。処理液の温度は
４０℃、処理時間は２０分である。なお、処理液の成
分、温度、撹拌方法は、ＳＴ０３の場合と同様である。
ＳＴ０５…セパレータ素材を水洗する。処理時間は１分
である。
ＳＴ０６…セパレータ素材を乾燥させる。所要時間は１
分である。
これで、セパレータの製造が完了する。以上の製造に要
した時間は合計で３４分であり、図８で説明した従来の
合計処理時間１３７分に比べて１０３分の短縮となる。ST04 ... With the potential difference between the separator material and the electrode kept constant at 1 V, the surface of the separator material is passivated to form a passivation film. The temperature of the treatment liquid is 40 ° C., and the treatment time is 20 minutes. The components of the treatment liquid, the temperature, and the stirring method are the same as in ST03. ST05: The separator material is washed with water. The processing time is 1 minute. ST06 ... Dry the separator material. The time required is 1
Minutes. This completes the manufacture of the separator. The time required for the above manufacturing is 34 minutes in total, which is 103 minutes shorter than the conventional total processing time of 137 minutes described with reference to FIG.
【００３７】上記した各処理工程は、セパレータ素材を
各処理槽及び乾燥機の位置に移動させて行う。即ち、Ｓ
Ｔ０１の脱脂は第１処理槽、ＳＴ０２の水洗は第２処理
槽、ＳＴ０３の電解エッチング処理及びＳＴ０４の不動
態化処理は第３処理槽、ＳＴ０５の水洗は第４処理槽、
ＳＴ０６の乾燥は乾燥機の位置で実施する。Each of the above-mentioned processing steps is carried out by moving the separator material to the position of each processing tank and dryer. That is, S
The degreasing of T01 is the first treatment tank, the washing of ST02 is the second treatment tank, the electrolytic etching treatment of ST03 and the passivation treatment of ST04 are the third treatment tank, and the washing of ST05 is the fourth treatment tank.
The drying of ST06 is performed at the dryer position.
【００３８】図４（ａ）〜（ｃ）は本発明に係るセパレ
ータの製造方法を説明する第１作用図であり、図３に示
した電解エッチング処理（ＳＴ０３）及び不動態化処理
（ＳＴ０４）について詳細に説明する。（ａ）〜（ｃ）
はセパレータ素材の断面図である。（ａ）は、セパレー
タ素材２０に異常表層部９１が形成されている状態を示
す。なお、９２・・・はセパレータ素材２０自体に含む良
導体である粒状の導電物（例えば、金属間化合物である
Ｃｒ2Ｂ）である。なお、導電物９２の形状はそれぞれ
異なるが便宜上同一符号を用いる。FIGS. 4 (a) to 4 (c) are first operation diagrams for explaining the separator manufacturing method according to the present invention. The electrolytic etching treatment (ST03) and passivation treatment (ST04) shown in FIG. Will be described in detail. (A)-(c)
FIG. 4 is a cross-sectional view of a separator material. (A) shows a state in which the abnormal surface layer portion 91 is formed on the separator material 20. In addition, 92 ... Is a granular conductor (for example, Cr 2 B which is an intermetallic compound) which is a good conductor contained in the separator material 20 itself. The conductors 92 have different shapes, but the same reference numerals are used for convenience.
【００３９】異常表層部９１は、圧延によって、セパレ
ータ素材２０に含まれていた粒状物質（金属間化合物
等）が砕かれて粒径が小さくなったり、酸化物等を含む
ことで導電性が低下した層であり、セパレータを積層し
た際に電気的な接触抵抗を高め、燃料電池の出力を低下
させる原因になる。The abnormal surface layer portion 91 has a reduced particle size due to the particulate matter (intermetallic compound, etc.) contained in the separator material 20 being crushed by rolling, and the conductivity is lowered due to the inclusion of oxides and the like. When the separators are laminated, the electrical contact resistance is increased and the output of the fuel cell is reduced.
【００４０】そこで、この異常表層部９１を除去するた
めに電解エッチング処理（図３のＳＴ０３参照）を実施
する。この結果、（ｂ）に示すように、異常表層部９１
が消失する。更に、電解エッチング処理では、セパレー
タ素材２０自体の表層をも除去し、導電物９２・・・をセ
パレータ素材２０自体から突出させる、即ち導電物９２
・・・の頭出しを行う。Therefore, an electrolytic etching process (see ST03 in FIG. 3) is carried out to remove the abnormal surface layer portion 91. As a result, as shown in (b), the abnormal surface portion 91
Disappears. Further, in the electrolytic etching treatment, the surface layer of the separator material 20 itself is also removed, and the conductors 92 ... Are projected from the separator material 20 itself, that is, the conductor 92.
Cue for ...
【００４１】そして、導電物９２・・・以外のセパレータ
素材２０自体の表面の腐食を防ぐために不動態化処理
（図３のＳＴ０４参照）を施し、（ｃ）に示すように、
セパレータ２０自体の表面に不動態皮膜９３を形成す
る。このとき、導電物９２・・・の表面には不動態被膜９
３は形成されず、導電物９２・・・は大きな表面積を有し
且つ不動態被膜９３より突出しているため、セパレータ
を積層した場合に隣接するセパレータ同士やセパレータ
と電極との接触抵抗を小さくすることができる。Then, a passivation treatment (see ST04 in FIG. 3) is applied to prevent the corrosion of the surface of the separator material 20 itself other than the conductors 92 ..., As shown in (c),
The passivation film 93 is formed on the surface of the separator 20 itself. At this time, the passivation film 9 is formed on the surface of the conductors 92 ...
3 is not formed, and the conductors 92 ... Have a large surface area and project from the passivation film 93. Therefore, when the separators are stacked, the contact resistance between the adjacent separators or between the separators and the electrodes is reduced. be able to.
【００４２】図５は本発明に係るセパレータの製造方法
を説明する第２作用図であり、図３及び図４で説明した
電解エッチング処理及び不動態化処理に関係する電位差
と電流密度との関係を示すグラフである。セパレータ素
材と電極との間に加える電位差の上限が約６Ｖまでの範
囲では、電位差を大きくしても電流密度はほとんど上昇
しない。これは、電位差が小さいうちにセパレータ素材
の表面に、金属酸化皮膜であって絶縁体又は絶縁体に近
い性質の不動態皮膜ができ、この不動態皮膜によって、
電流が流れにくくなる。この電位差の範囲を不動態域と
いう。FIG. 5 is a second action diagram for explaining the method of manufacturing the separator according to the present invention. The relation between the potential difference and the current density relating to the electrolytic etching process and the passivation process described in FIGS. 3 and 4. It is a graph which shows. When the upper limit of the potential difference applied between the separator material and the electrode is up to about 6 V, the current density hardly increases even if the potential difference is increased. This is, while the potential difference is small, on the surface of the separator material, a passivation film that is a metal oxide film and is an insulator or a property close to an insulator can be formed.
It becomes difficult for current to flow. The range of this potential difference is called a passive region.
【００４３】また、電位差を不動態域よりも大きくする
と、電流密度が急激に増加する。これは、電流が酸素発
生とセパレータ素材（異常表層部及びセパレータ素材自
体）の溶解との両方に費やされ、しかも金属酸化皮膜を
形成するよりも溶解の速度が大きくなるからである。こ
の電位差の範囲を過不動態域という。When the potential difference is made larger than the passivity region, the current density sharply increases. This is because the electric current is consumed for both the oxygen generation and the dissolution of the separator material (the abnormal surface layer portion and the separator material itself), and the dissolution rate is higher than that of forming the metal oxide film. The range of this potential difference is called a passive state.
【００４４】従って、上記した過不動態域を電解エッチ
ング処理に利用すれば、セパレータ素材の異常表層部の
除去及び導電物頭出しのためのセパレータ素材自体の表
面の除去を行うことができる。また、上記した不動態域
を不動態化処理に利用して不動態皮膜を形成することが
できる。Therefore, if the above-mentioned passivation region is used for the electrolytic etching treatment, it is possible to remove the abnormal surface layer portion of the separator material and the surface of the separator material itself in order to locate the conductor. Further, the above-mentioned passivation region can be utilized for passivation treatment to form a passivation film.
【００４５】電解エッチング処理では、電位差Ｖｅを調
整、即ち電位制御して、例えば、電流密度を１８Ａ／ｄ
ｍ2一定となるようにする。不動態化処理では、例え
ば、電位差を１Ｖ一定に保つ。In the electrolytic etching process, the electric potential difference Ve is adjusted, that is, the electric potential is controlled, and the current density is, for example, 18 A / d.
Keep m 2 constant. In the passivation process, for example, the potential difference is kept constant at 1V.
【００４６】図６は本発明に係るセパレータの製造装置
の要部を説明するブロック構成図であり、電解エッチン
グ処理及び不動態化処理の際の電位制御のための構成を
説明する。セパレータ製造装置１０を構成する電位制御
装置９５は、時間信号ＳＴを生成するタイマ４１（図１
も参照）と、このタイマ４１からの時間信号ＳＴに基づ
いて電解エッチング処理及び不動態化処理の処理時間を
設定するとともに電解エッチング処理及び不動態化処理
のための電位差を制御する電位制御手段３８（即ち制御
装置３８（図１参照）である。）と、この電位制御手段
３８からの制御信号ＳＣに従ってセパレータ素材２０、
電極５７間に給電する給電手段３７（即ち給電装置３７
（図１及び図２参照）である。）と、この給電手段３７
により給電するときの電流密度を検知するとともに検知
した電流密度に基づいて電位制御手段３８へ電流密度信
号ＳＤを供給する電流密度検知手段５８（即ち、電流密
度検知装置５８（図２参照）である。）とからなる。FIG. 6 is a block configuration diagram for explaining a main part of the separator manufacturing apparatus according to the present invention. The configuration for controlling the potential during the electrolytic etching process and the passivation process will be described. The potential control device 95 that constitutes the separator manufacturing apparatus 10 includes a timer 41 (see FIG. 1) that generates a time signal ST.
(See also) and the potential control means 38 for setting the processing time of the electrolytic etching process and the passivation process based on the time signal ST from the timer 41 and controlling the potential difference for the electrolytic etching process and the passivation process. (That is, the control device 38 (see FIG. 1)) and the separator material 20 according to the control signal SC from the potential control means 38.
Power feeding means 37 for feeding power between the electrodes 57 (that is, power feeding device 37
(See FIGS. 1 and 2). ) And this power supply means 37
The current density detecting means 58 (that is, the current density detecting device 58 (see FIG. 2)) which detects the current density when the power is supplied by the power supply and supplies the current density signal SD to the potential control means 38 based on the detected current density. .) And.
【００４７】電解エッチング処理の際には、給電手段３
７からセパレータ素材２０及び電極５７へ給電すると、
このときの電流密度検知手段５８で検知した電流密度に
基づいて、電位制御手段３８は、セパレータ素材２０と
電極５７との電位差が１８Ｖ／ｄｍ2となるように給電
手段３７を制御する。In the electrolytic etching process, the power feeding means 3
When power is supplied from 7 to the separator material 20 and the electrode 57,
Based on the current density detected by the current density detection means 58 at this time, the potential control means 38 controls the power supply means 37 so that the potential difference between the separator material 20 and the electrode 57 becomes 18 V / dm 2 .
【００４８】例えば、電流密度検知手段５８で検知した
電流密度が１８Ｖ／ｄｍ2よりも小さければ、電位制御
手段３８は、セパレータ素材２０と電極５７との電位差
を大きくするように給電手段３７を制御して電流密度を
大きくし、検知した電流密度が１８Ｖ／ｄｍ2よりも大
きければ、電位制御手段３８は、セパレータ素材２０と
電極５７との電位差を小さくするように給電手段３７を
制御して電流密度を小さくすることにより、電流密度が
１８Ｖ／ｄｍ2一定となるようにする。不動態化処理の
際には、電位制御手段３８は、セパレータ素材２０と電
極５７との電位差が１Ｖ一定となるように給電手段３７
を制御する。For example, if the current density detected by the current density detecting means 58 is smaller than 18 V / dm 2 , the potential controlling means 38 controls the power feeding means 37 so as to increase the potential difference between the separator material 20 and the electrode 57. Then, if the detected current density is larger than 18 V / dm 2 , the potential control means 38 controls the power supply means 37 so as to reduce the potential difference between the separator material 20 and the electrode 57. The current density is kept constant at 18 V / dm 2 by reducing the density. During the passivation process, the potential control unit 38 supplies the power supply unit 37 so that the potential difference between the separator material 20 and the electrode 57 becomes constant at 1V.
To control.
【００４９】以上の図２、図３及び図４で説明したよう
に、本発明は第１に、セパレータ素材２０を圧延手段で
圧延する工程と、圧延材をプレス手段で所定形状に成形
する工程と、先の圧延工程でセパレータ素材２０に発生
していた異常表層部９１を除去するとともにセパレータ
素材２０自体の表層部に含む導電物９２の一部を突出さ
せて頭出しする工程と、セパレータ素材２０自体の表層
部に不動態化処理を施す工程とからなり、異常表層部９
１を除去し導電物９２を頭出しする工程を電解エッチン
グ処理で行うとともに、この電解エッチング処理の工程
と不動態化処理の工程とを電位制御により、例えば同一
の第３処理槽１３にて連続して実施することを特徴とす
る。As described above with reference to FIGS. 2, 3 and 4, the present invention firstly comprises a step of rolling the separator material 20 by means of rolling means and a step of forming the rolled material into a predetermined shape by means of pressing means. And a step of removing the abnormal surface layer portion 91 generated in the separator material 20 in the previous rolling step and projecting a part of the conductive material 92 included in the surface layer portion of the separator material 20 itself so as to locate the head, and the separator material. 20 to passivate the surface layer of itself.
The step of removing 1 and exposing the conductor 92 is performed by electrolytic etching, and the step of electrolytic etching and the step of passivation are continuously controlled by potential control, for example, in the same third processing tank 13. It is characterized by carrying out.
【００５０】従来、セパレータ素材の異常表層部の除
去、導電物の頭出し及び不動態化処理を別々な工程（処
理槽及び処理液も別々である。）で行っていたものを、
本発明では、電位制御により連続して少ない工程で、例
えば、同一の第３処理槽１３にて行うことにより、処理
工程数を１１工程から６工程にほぼ半減することができ
て、処理時間を１３７分から３４分に（ほぼ１／４に）
短縮することができ、金属製セパレータの生産性を大幅
に高めることができるとともに製造コストをより一層削
減することができる。従って、燃料電池の製造コストを
低減することができる。Conventionally, the removal of the abnormal surface layer of the separator material, the cueing of the conductive material, and the passivation treatment are performed in different steps (the treatment tank and the treatment liquid are also different).
In the present invention, the number of processing steps can be reduced from 11 steps to 6 steps, and the processing time can be reduced by about half by performing the steps in a small number of steps continuously by controlling the potential, for example, in the same third processing tank 13. From 137 minutes to 34 minutes (almost 1/4)
It can be shortened, the productivity of the metallic separator can be significantly increased, and the manufacturing cost can be further reduced. Therefore, the manufacturing cost of the fuel cell can be reduced.
【００５１】本発明は第２に、図２、図４及び図５で説
明したように、電位制御を、セパレータ素材２０を陽極
にするとともにこの陽極に対向させた電極５７を負極と
するときに、電解エッチング処理では陽・負極間の電位
差を大きくし、不動態化処理では陽・負極間の電位差を
小さくすることを特徴とする。具体的には、電解エッチ
ング処理では、電流密度が１８Ｖ／ｄｍ2一定となるよ
うな電位差Ｖｅとし、不動態化処理では、電位差１Ｖ一
定とする。Secondly, according to the present invention, as described with reference to FIGS. 2, 4 and 5, the potential control is performed when the separator material 20 is used as an anode and the electrode 57 facing the anode is used as a negative electrode. The electrolytic etching treatment is characterized by increasing the positive-negative electrode potential difference, and the passivation treatment is characterized by decreasing the positive-negative electrode potential difference. Specifically, the potential difference Ve is set so that the current density is constant at 18 V / dm 2 in the electrolytic etching process, and the potential difference is fixed at 1 V in the passivation process.
【００５２】電解エッチング処理のときには、電位差を
大きくして過不動態なる状態を形成することで、セパレ
ータ素材２０の異常表層部９１及びセパレータ素材２０
自体の表層部を除去し易くして導電物９２の頭出しを容
易にし、不動態化処理のときには、電位差を小さくして
不動態なる状態を形成することで、セパレータ素材２０
への不動態皮膜９３の形成を容易にすることができる。During the electrolytic etching process, the potential difference is increased to form a state of overpassivity, whereby the abnormal surface layer portion 91 of the separator material 20 and the separator material 20 are formed.
The separator material 20 is formed by facilitating removal of the surface layer of the separator itself, facilitating the beginning of the conductor 92, and reducing the potential difference during passivation to form a passivated state.
It is possible to facilitate the formation of the passivation film 93.
【００５３】本発明は第３に、電解エッチング処理で
は、陽・負極間の電位差を大きくするとともに電流密度
を一定に保つようにすることを特徴とする。例えば、電
位差を大きくするとともに電位差を一定とした場合に
は、電解エッチング処理の時間経過に伴って、金属材料
の表面に過不動態域での皮膜が次第に形成され、電流が
流れなくなって電解エッチング処理の反応が遅くなる
が、本発明のように電流密度を一定に保つように電位制
御することにより、電解エッチング処理の反応を良好に
持続させることができる。Thirdly, the present invention is characterized in that, in the electrolytic etching treatment, the potential difference between the positive and negative electrodes is increased and the current density is kept constant. For example, when the potential difference is made large and the potential difference is made constant, a film in the passivation region is gradually formed on the surface of the metal material with the lapse of time of the electrolytic etching process, and the current stops flowing and the electrolytic etching is stopped. Although the reaction of the treatment becomes slow, the reaction of the electrolytic etching treatment can be favorably maintained by controlling the potential so as to keep the current density constant as in the present invention.
【００５４】本発明は第４に、図１、図２及び図４で説
明したように、セパレータ素材２０を圧延手段で圧延
し、圧延材をプレス手段で所定形状に成形し、電解エッ
チング処理にて圧延工程で発生していた異常表層部９１
を除去するとともにセパレータ素材２０自体の表層部に
含む導電物９２の一部を突出させて頭出しを行い、セパ
レータ素材２０自体の表層部に不動態化処理を施すこと
でセパレータを製造する燃料電池用セパレータ製造装置
１０であって、このセパレータ製造装置１０を、セパレ
ータ素材２０を電解エッチング処理するために処理液４
９を満たすとともに処理液４９内に電極５７を設けた第
３処理槽１３と、この第３処理槽１３内の処理液４９に
浸したセパレータ素材２０、電極５７間に給電する給電
装置３７と、この給電装置３７で給電中の電流密度を検
知する電流密度検知装置５８と、この電流密度検知装置
５８で検知した電流密度に応じてセパレータ素材２０、
電極５７間の電位差を制御する制御装置３８と、所定時
間の給電を行うために制御装置３８に時間信号ＳＴを送
るタイマ４１とから構成する。従来に比べて、より簡単
な構成でセパレータを製造することができ、セパレータ
製造装置１０のコストを低減することができる。Fourthly, according to the present invention, as described with reference to FIGS. 1, 2 and 4, the separator material 20 is rolled by a rolling means, the rolled material is formed into a predetermined shape by a pressing means, and electrolytically treated. Abnormal surface layer portion 91 that has occurred in the rolling process
Fuel cell in which the separator is manufactured by removing a portion of the conductive material 92 included in the surface layer portion of the separator material 20 itself to perform cueing, and performing a passivation treatment on the surface layer portion of the separator material 20 itself. A separator manufacturing apparatus 10 for treating a separator material 20 for electrolytically etching a separator material 20.
9, a third treatment tank 13 having an electrode 57 provided in the treatment liquid 49, a separator material 20 immersed in the treatment liquid 49 in the third treatment tank 13, and a power supply device 37 for supplying power between the electrodes 57, A current density detection device 58 that detects the current density during power supply by the power supply device 37, and the separator material 20 according to the current density detected by the current density detection device 58,
The control unit 38 controls the potential difference between the electrodes 57, and the timer 41 sends a time signal ST to the control unit 38 to supply power for a predetermined time. The separator can be manufactured with a simpler structure than the conventional one, and the cost of the separator manufacturing apparatus 10 can be reduced.
【００５５】尚、本発明の実施の形態では、電解エッチ
ング処理の工程と不動態化処理の工程とを電位制御によ
り同一処理槽にて連続して実施するようにしたが、これ
に限らず、電解エッチング処理の工程と不動態化処理の
工程とを電位制御によりそれぞれ別々の処理液を満たし
た別々の処理槽にて連続して実施するようにしてもよ
い。In the embodiment of the present invention, the electrolytic etching process and the passivation process are continuously performed in the same processing tank by potential control, but the invention is not limited to this. The electrolytic etching process and the passivation process may be continuously performed in different processing tanks filled with different processing liquids by potential control.
【００５６】[0056]
【発明の効果】本発明は上記構成により次の効果を発揮
する。請求項１の燃料電池用セパレータの製造方法は、
異常表層部を除去し導電物を頭出しする工程を電解エッ
チング処理で行うとともに、この電解エッチング処理の
工程と不動態化処理の工程とを電位制御により連続して
実施するので、従来、セパレータ用金属材料の異常表層
部の除去、導電物の頭出し及び不動態化処理を別々な工
程で行っていたものを、本発明では、電位制御により連
続して少ない工程で実施することにより、処理工程数を
減らすことができて、処理時間を短縮することができ、
金属製セパレータの生産性を高めるとともに製造コスト
を削減することができる。従って、燃料電池の製造コス
トを低減することができる。The present invention has the following effects due to the above configuration. A method for manufacturing a fuel cell separator according to claim 1,
Since the step of removing the abnormal surface layer and exposing the conductor is performed by electrolytic etching, and the step of electrolytic etching and the step of passivation are continuously performed by potential control, the conventional separator In the present invention, the removal of the abnormal surface layer of the metal material, the cueing of the conductor, and the passivation treatment are performed in separate steps. The number can be reduced, the processing time can be shortened,
It is possible to increase the productivity of the metal separator and reduce the manufacturing cost. Therefore, the manufacturing cost of the fuel cell can be reduced.
【００５７】請求項２の燃料電池用セパレータの製造方
法は、電位制御を、金属材料を陽極にするとともにこの
陽極に対向させた電極を負極とするときに、電解エッチ
ング処理では陽・負極間の電位差を大きくし、不動態化
処理では陽・負極間の電位差を小さくするので、電解エ
ッチング処理のときには、電位差を大きくして過不動態
なる状態を形成することで、金属材料の異常表層部及び
金属材料自体の表層部を除去し易くするようにして導電
物の頭出しを容易にし、不動態化処理のときには、電位
差を小さくして不動態なる状態を形成することで、金属
材料への不動態皮膜の形成を容易にすることができる。In the method for manufacturing a fuel cell separator according to a second aspect of the present invention, when the potential control is performed by using a metal material as an anode and an electrode facing the anode as a negative electrode, a positive electrode and a negative electrode are subjected to electrolytic etching treatment. Since the potential difference is increased and the potential difference between the positive electrode and the negative electrode is reduced in the passivation process, during the electrolytic etching process, the potential difference is increased to form a state of overpassivity, thereby forming an abnormal surface layer portion of the metal material. When the passivation process is performed, the potential difference is reduced to form a passivated state so that the surface of the metal material itself can be easily removed. The formation of the dynamic film can be facilitated.
【００５８】請求項３の燃料電池用セパレータの製造方
法は、電解エッチング処理では、陽・負極間の電位差を
大きくするとともに電流密度を一定に保つようにするの
で、例えば、電位差を大きくするとともに電位差を一定
とした場合には、電解エッチング処理の時間経過に伴っ
て、金属材料の表面に過不動態域での皮膜が次第に形成
され、電流が流れなくなって電解エッチング処理の反応
が遅くなるが、本発明のように電流密度を一定に保つよ
うに電位制御することにより、電解エッチング処理の反
応を良好に持続させることができる。In the method of manufacturing the fuel cell separator according to the third aspect of the present invention, in the electrolytic etching treatment, the potential difference between the positive electrode and the negative electrode is increased and the current density is kept constant. Therefore, for example, the potential difference is increased and the potential difference is increased. If is constant, with the passage of time of the electrolytic etching process, a film in the passivation region is gradually formed on the surface of the metal material, the current stops flowing, and the reaction of the electrolytic etching process slows, By controlling the potential so as to keep the current density constant as in the present invention, the reaction of the electrolytic etching treatment can be favorably maintained.
【００５９】請求項４の燃料電池用セパレータの製造装
置は、金属材料を電解エッチング処理するために処理液
を満たすとともに処理液内に電極を設けた処理槽と、こ
の処理槽内の処理液に浸した金属材料、電極間に給電す
る給電手段と、この給電手段で給電中の電流密度を検知
する電流密度検知手段と、この電流密度検知手段で検知
した電流密度に応じて金属材料、電極間の電位差を制御
する電位制御手段と、所定時間の給電を行うために電位
制御手段に時間信号を送るタイマとから構成するので、
従来に比べて、より簡単な構成でセパレータを製造する
ことができ、セパレータの製造装置のコストを低減する
ことができる。従って、燃料電池を安価に提供すること
が可能になる。According to a fourth aspect of the present invention, there is provided a manufacturing apparatus for a fuel cell separator, which comprises a processing tank filled with a processing solution for electrolytically etching a metal material and having electrodes provided in the processing solution, and a processing solution in the processing tank. Immersed metal material, power supply means for supplying power between electrodes, current density detection means for detecting current density during power supply by this power supply means, and metal material, between electrodes depending on the current density detected by this current density detection means Since it is composed of a potential control means for controlling the potential difference of and a timer for sending a time signal to the potential control means for supplying power for a predetermined time,
The separator can be manufactured with a simpler structure than the conventional one, and the cost of the separator manufacturing apparatus can be reduced. Therefore, the fuel cell can be provided at a low cost.
【図１】本発明に係る燃料電池用セパレータの製造装置
を示す説明図FIG. 1 is an explanatory view showing an apparatus for manufacturing a fuel cell separator according to the present invention.
【図２】本発明に係るセパレータの処理状態を示す説明
図FIG. 2 is an explanatory view showing a processing state of a separator according to the present invention.
【図３】本発明に係るセパレータの製造方法を説明する
フロー図FIG. 3 is a flowchart illustrating a method of manufacturing a separator according to the present invention.
【図４】本発明に係るセパレータの製造方法を説明する
第１作用図FIG. 4 is a first operation diagram illustrating a method of manufacturing a separator according to the present invention.
【図５】本発明に係るセパレータの製造方法を説明する
第２作用図FIG. 5 is a second action diagram for explaining the separator manufacturing method according to the present invention.
【図６】本発明に係るセパレータの製造装置の要部を説
明するブロック構成図FIG. 6 is a block diagram illustrating a main part of a separator manufacturing apparatus according to the present invention.
【図７】従来の金属製セパレータの製造要領を説明する
説明図FIG. 7 is an explanatory view illustrating a manufacturing procedure of a conventional metal separator.
【図８】従来の金属製セパレータの製造工程を説明する
フロー図FIG. 8 is a flowchart illustrating a manufacturing process of a conventional metal separator.
１０…セパレータ製造装置、１３…処理槽（第３処理
槽）、２０…金属材料（セパレータ素材）、３７…給電
手段（給電装置）、３８…電位制御手段（制御装置）、
４１…タイマ、４９…処理液、５７…電極、５８…電流
密度検知装置（電流密度検知手段）、９１…異常表層
部、９２…導電物。10 ... Separator manufacturing apparatus, 13 ... Processing tank (third processing tank), 20 ... Metal material (separator material), 37 ... Power feeding means (power feeding apparatus), 38 ... Potential control means (control apparatus),
41 ... Timer, 49 ... Treatment liquid, 57 ... Electrode, 58 ... Current density detection device (current density detection means), 91 ... Abnormal surface layer section, 92 ... Conductive material.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ２５Ｄ 21/12 Ｃ２５Ｄ 21/12 Ａ Ｊ Ｃ２５Ｆ 3/02 Ｃ２５Ｆ 3/02 Ｂ Ｃ 3/06 3/06 7/00 7/00 Ｌ Ｖ Ｈ０１Ｍ 8/10 Ｈ０１Ｍ 8/10 ─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. 7 Identification Code FI Theme Coat (Reference) C25D 21/12 C25D 21/12 A J C25F 3/02 C25F 3/02 BC C 3/06 3/06 7 / 00 7/00 L V H01M 8/10 H01M 8/10
Claims (4)
する工程と、圧延材をプレス手段で所定形状に成形する
工程と、先の前記圧延工程で発生していた異常表層部を
除去するとともに金属材料自体の表層部に含む導電物の
一部を突出させて頭出しする工程と、金属材料自体の表
層部に不動態化処理を施す工程とからなり、前記異常表
層部を除去し導電物を頭出しする工程を電解エッチング
処理で行うとともに、この電解エッチング処理の工程と
前記不動態化処理の工程とを電位制御により連続して実
施することを特徴とする燃料電池用セパレータの製造方
法。1. A step of rolling a metallic material for a separator by a rolling means, a step of shaping a rolled material into a predetermined shape by a pressing means, and removing an abnormal surface layer portion that has occurred in the previous rolling step, and metal It consists of a step of projecting a part of the conductive material included in the surface layer part of the material itself to the beginning, and a step of performing passivation treatment on the surface layer part of the metal material itself, removing the abnormal surface layer part and removing the conductive material. A method for producing a fuel cell separator, characterized in that the step of cueing is performed by electrolytic etching, and the step of electrolytic etching and the step of passivation are continuously performed by potential control.
するとともにこの陽極に対向させた電極を負極とすると
きに、前記電解エッチング処理では陽・負極間の電位差
を大きくし、前記不動態化処理では陽・負極間の電位差
を小さくすることを特徴とする請求項１記載の燃料電池
用セパレータの製造方法。2. The potential control is performed by increasing a potential difference between a positive electrode and a negative electrode in the electrolytic etching process when the metal material is used as an anode and an electrode facing the anode is used as a negative electrode. The method for manufacturing a fuel cell separator according to claim 1, wherein the potential difference between the positive electrode and the negative electrode is reduced in the chemical treatment.
間の電位差を大きくするとともに電流密度を一定に保つ
ようにすることを特徴とする請求項２記載の燃料電池用
セパレータの製造方法。3. The method for producing a fuel cell separator according to claim 2, wherein in the electrolytic etching treatment, the potential difference between the positive electrode and the negative electrode is increased and the current density is kept constant.
し、圧延材をプレス手段で所定形状に成形し、電解エッ
チング処理にて前記圧延工程で発生していた異常表層部
を除去するとともに金属材料自体の表層部に含む導電物
の一部を突出させて頭出しを行い、金属材料自体の表層
部に不動態化処理を施すことでセパレータを製造する燃
料電池用セパレータの製造装置であって、 この製造装置は、金属材料を電解エッチング処理するた
めに処理液を満たすとともに処理液内に電極を設けた処
理槽と、この処理槽内の処理液に浸した金属材料、電極
間に給電する給電手段と、この給電手段で給電中の電流
密度を検知する電流密度検知手段と、この電流密度検知
手段で検知した電流密度に応じて金属材料、電極間の電
位差を制御する電位制御手段と、所定時間の給電を行う
ために前記電位制御手段に時間信号を送るタイマとから
なる燃料電池用セパレータの燃料電池用セパレータの製
造装置。4. A metal material for a separator is rolled by a rolling means, the rolled material is formed into a predetermined shape by a pressing means, and an abnormal surface layer portion generated in the rolling step is removed by electrolytic etching treatment, and the metal material is used. A manufacturing apparatus for a fuel cell separator for manufacturing a separator by projecting a part of a conductive material included in a surface layer part of itself to produce a separator by performing passivation treatment on a surface layer part of a metal material itself, This manufacturing apparatus is a power supply for supplying electric power between a treatment tank filled with a treatment liquid for electrolytically treating a metal material and having electrodes in the treatment liquid, a metal material immersed in the treatment liquid in the treatment tank, and electrodes. Means, a current density detecting means for detecting a current density during power feeding by the power feeding means, and a potential control means for controlling a potential difference between the metal material and the electrodes according to the current density detected by the current density detecting means. It said potential control means producing apparatus for a fuel cell separator of a fuel cell separator comprising a timer that sends a time signal in order to perform the feeding of the predetermined time.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002022436A JP3831269B2 (en) | 2002-01-30 | 2002-01-30 | Manufacturing method and apparatus for separator for fuel cell |
| CA2468510A CA2468510C (en) | 2001-12-18 | 2002-12-12 | Method of producing fuel cell-use separator and device for producing it |
| PCT/JP2002/013026 WO2003052848A1 (en) | 2001-12-18 | 2002-12-12 | Method of producing fuel cell-use separator and device for producing it |
| AU2002366465A AU2002366465A1 (en) | 2001-12-18 | 2002-12-12 | Method of producing fuel cell-use separator and device for producing it |
| EP02790738A EP1467424B1 (en) | 2001-12-18 | 2002-12-12 | Method of producing a fuel cell separator |
| DE60239489T DE60239489D1 (en) | 2001-12-18 | 2002-12-12 | METHOD FOR PRODUCING A FUEL CELL PARAATOR |
| KR1020047009390A KR100874563B1 (en) | 2001-12-18 | 2002-12-12 | Method for manufacturing separator for fuel cell and apparatus for manufacturing same |
| CNB028254171A CN1290219C (en) | 2001-12-18 | 2002-12-12 | Method of producing fuel cell-use separator and device for producing it |
| US10/499,048 US7254887B2 (en) | 2001-12-18 | 2002-12-12 | Fuel cell separator manufacturing method and manufacturing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002022436A JP3831269B2 (en) | 2002-01-30 | 2002-01-30 | Manufacturing method and apparatus for separator for fuel cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003223902A true JP2003223902A (en) | 2003-08-08 |
| JP3831269B2 JP3831269B2 (en) | 2006-10-11 |
Family
ID=27745431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002022436A Expired - Fee Related JP3831269B2 (en) | 2001-12-18 | 2002-01-30 | Manufacturing method and apparatus for separator for fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3831269B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005268041A (en) * | 2004-03-18 | 2005-09-29 | Honda Motor Co Ltd | Manufacturing method of conductive substance contained stainless steel separator |
| JP2009263794A (en) * | 2008-04-23 | 2009-11-12 | Hyundai Hysco | Stainless steel separator for fuel cell and method of manufacturing the same |
| WO2011010746A1 (en) * | 2009-07-23 | 2011-01-27 | Ｊｆｅスチール株式会社 | Stainless steel for fuel cell having excellent corrosion resistance and method for producing same |
| EP2137339A4 (en) * | 2007-04-18 | 2016-08-24 | Hyundai Steel Co | Stainless steel separator for fuel cell and the manufacturing method thereof |
-
2002
- 2002-01-30 JP JP2002022436A patent/JP3831269B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005268041A (en) * | 2004-03-18 | 2005-09-29 | Honda Motor Co Ltd | Manufacturing method of conductive substance contained stainless steel separator |
| JP4575007B2 (en) * | 2004-03-18 | 2010-11-04 | 本田技研工業株式会社 | Method for producing conductive material-containing stainless steel separator |
| EP2137339A4 (en) * | 2007-04-18 | 2016-08-24 | Hyundai Steel Co | Stainless steel separator for fuel cell and the manufacturing method thereof |
| JP2009263794A (en) * | 2008-04-23 | 2009-11-12 | Hyundai Hysco | Stainless steel separator for fuel cell and method of manufacturing the same |
| US9070907B2 (en) | 2008-04-23 | 2015-06-30 | Hyundai Hysco | Stainless separator for fuel cell and method of manufacturing the same |
| US9331343B2 (en) | 2008-04-23 | 2016-05-03 | Hyundai Steel Company | Stainless separator for fuel cell and method of manufacturing the same |
| US9337495B2 (en) | 2008-04-23 | 2016-05-10 | Hyundai Steel Company | Stainless separator for fuel cell and method of manufacturing the same |
| US9337496B2 (en) | 2008-04-23 | 2016-05-10 | Hyundai Steel Company | Stainless separator for fuel cell and method of manufacturing the same |
| US9425450B2 (en) | 2008-04-23 | 2016-08-23 | Hyundai Steel Company | Stainless separator for fuel cell and method of manufacturing the same |
| WO2011010746A1 (en) * | 2009-07-23 | 2011-01-27 | Ｊｆｅスチール株式会社 | Stainless steel for fuel cell having excellent corrosion resistance and method for producing same |
| JP2011047041A (en) * | 2009-07-23 | 2011-03-10 | Jfe Steel Corp | Stainless steel for fuel cell having excellent corrosion resistance and method for producing the same |
| US9130199B2 (en) | 2009-07-23 | 2015-09-08 | Jfe Steel Corporation | Stainless steel for fuel cell having good corrosion resistance and method for producing the same |
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|---|---|
| JP3831269B2 (en) | 2006-10-11 |
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