WO2005035816A1 - 固体高分子型燃料電池セパレータ用ステンレス鋼およびそのステンレス鋼を用いた固体高分子型燃料電池 - Google Patents
固体高分子型燃料電池セパレータ用ステンレス鋼およびそのステンレス鋼を用いた固体高分子型燃料電池 Download PDFInfo
- Publication number
- WO2005035816A1 WO2005035816A1 PCT/JP2004/008401 JP2004008401W WO2005035816A1 WO 2005035816 A1 WO2005035816 A1 WO 2005035816A1 JP 2004008401 W JP2004008401 W JP 2004008401W WO 2005035816 A1 WO2005035816 A1 WO 2005035816A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stainless steel
- mass
- less
- fuel cell
- separator
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
-
- 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
-
- 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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
- H01M8/0254—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form corrugated or undulated
-
- 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
- H01M8/1007—Fuel cells with solid electrolytes with both reactants being gaseous or vaporised
-
- 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
Definitions
- the present invention relates to a stainless steel for a solid polymer fuel cell separator having excellent durability and low contact resistance, and a solid polymer using the stainless steel separator. Fuel cell type.
- polymer electrolyte fuel cells are examples of polymer electrolyte fuel cells.
- the power generation temperature is about 80 ° C, and power can be generated at a much lower temperature.
- the weight and size of the fuel cell body can be reduced.
- polymer electrolyte fuel cells are the hottest fuel cells of today to be used as power sources for onboard electric vehicles, stationary generators for home use, and small portable generators.
- Polymer electrolyte fuel cell which out taking electricity from between H 2 0 2 through the polymer film, as shown in FIG. 1, the gas diffusion layer 2, 3 (e.g. a car Bonpepa etc.) Contact
- the membrane-electrode assembly 1 is sandwiched between the separators 4 and 5, and this is defined as a single component (so-called single cell).
- An electromotive force is generated between the generator 4 and the separator 5.
- the membrane-electrode assembly 1 is called MEA (that is, Membrane-Electrode Assembly), in which a polymer film and an electrode material such as carbon black carrying a platinum-based catalyst are integrated on the front and back surfaces of the film.
- the thickness is several tens; ni to several hundreds.
- the gas diffusion layers 2 and 3 are often integrated with the membrane-electrode assembly 1.
- the separators 4 and 5 are required to have characteristics such as corrosion resistance that can withstand long-term power generation.
- the contact resistance between the separators 4, 5 and the gas diffusion layers 2, 3 be as low as possible. The reason is that when the contact resistance between the separators 4 and 5 and the gas diffusion layers 2 and 3 increases, the power generation efficiency of the polymer electrolyte fuel cell decreases. In other words, the smaller the contact resistance, the better the electrical conductivity.
- Japanese Patent Application Laid-Open No. 8-180883 discloses a technique using a metal such as stainless steel, which easily forms a passive film, as a separator.
- a metal such as stainless steel
- the formation of a passive film leads to an increase in contact resistance, leading to a decrease in power generation efficiency.
- these metal materials have problems to be improved, such as higher contact resistance and lower corrosion resistance than carbon materials such as graphite.
- JP-A-200-239806 and JP-A-2000-294255 disclose that Cu, Ni are positively added, impurity elements such as S, p, and N are reduced, and C + N 0. 03 mass. / 0 , 10.5% by mass ⁇ Cr + 3XMo ⁇ 43% by mass discloses a frit-based stainless steel for separators.
- Japanese Patent Application Laid-Open Nos. 2000-265248 and 2000-294256 disclose that Cu and Ni are limited to 0.2% by mass or less to suppress metal ion elution, and that impurities such as S, P, and N element to reduce, and C + N ⁇ 0.
- 03 wt% 10.5 wt% ⁇ ( ⁇ + 3 X Mo ⁇ 43 separator satisfies mass% ferritic stainless steel is disclosed.
- the components of stainless steel are specified in the range of determination, and the passive state film is strengthened to improve the surface. It is based on the idea of reducing the catalytic performance of the electrode-carrying catalyst due to eluting metal ions even when used as is without any treatment, and to suppress the increase in contact resistance with the electrode due to corrosion products. Therefore, it does not attempt to lower the contact resistance of the stainless steel itself. Also, it does not provide the durability (that is, the reduction in output voltage) that can endure tens of thousands of hours of power generation. Also, Japanese Patent Application Laid-Open No. 10-228914 discloses a technique in which the surface of a metal separator such as SUS304 is plated with metal to reduce contact resistance and secure high output. However, it is difficult to prevent the occurrence of pinholes with a thin metallization, and conversely, a cost problem remains with a thick metallization.
- Japanese Patent Application Laid-Open No. 2000-277133 discloses a method of dispersing carbon powder in a ferritic stainless steel base material to obtain a separator having improved electric conductivity.
- the cost of the surface treatment of the separator is still high, so the cost problem still remains.
- the surface-treated separator is significantly reduced in corrosion resistance when scratches or the like occur during assembly.
- Japanese Patent Application Laid-Open No. 2003-223904 is an invention developed by the present applicant, and also studies the effect of surface roughness of stainless steel surface on contact resistance. It discloses that the contact resistance is reduced by setting the surface roughness to Ra: 0.01 / Zm to l / zm and Ry: 0.01 to 20 / m. However, the contact resistance was insufficient from the viewpoint of increasing the output of the battery. Disclosure of the invention
- the present invention has been made in consideration of the above-mentioned problems (1) of the prior art, and has been developed for polymer electrolyte fuel cell separators having good corrosion resistance and low contact resistance (that is, excellent electrical conductivity).
- An object of the present invention is to provide stainless steel and a polymer electrolyte fuel cell using the same.
- the present invention regulates not only the components of the stainless steel as the material but also the components of the passive film present on the surface within a predetermined range, so that the contact resistance is small even without surface treatment, and the power generation efficiency is reduced.
- An object of the present invention is to provide a stainless steel for a polymer electrolyte fuel cell separator which is excellent and has high corrosion resistance of the stainless steel itself, and a polymer electrolyte fuel cell using the same.
- C is 0.03% by mass or less
- ⁇ is 0.03% by mass. /.
- 16 to 45% by mass of Cr and 0.1 to 5.0% by mass of Mo. / 0 contains, and the total content of C and N content satisfies 0.03 mass% or less, a stainless steel having the balance consisting of Fe and unavoidable impurities, and the surface of the stainless steel Atomic ratio of Al, Cr and Fe contained in the passivation film of Cr / Fe is 1 or more and the atomic ratio Al / (Cr + Fe) force is less than 0.10.
- Stainless steel for molecular fuel cell separator is 0.03% by mass or less
- ⁇ is 0.03% by mass. /.
- 16 to 45% by mass of Cr and 0.1 to 5.0% by mass of Mo. / 0 contains, and the total content of C and N content satisfies 0.03 mass% or less, a stainless steel having the balance consisting of Fe and unavoidable impurities, and the surface of the stainless steel Atom
- C is 0.03% by mass or less
- N is 0.03% by mass or less
- Cr is 20 to 45% by mass.
- Mo is contained in an amount of 0.1 to 5.0% by mass
- the total of the C content and the N content satisfies 0.03% by mass or less
- the balance is Fe and unavoidable impurities.
- Stainless steel having a composition, and a table of the stainless steel Solid polymer type fuel in which the atomic ratio Cr / Fe of Al, Cr and Fe contained in the passive film on the surface is 1 or more and the atomic ratio Al / (Cr + Fe) force is less than 0.05 Stainless steel for fuel cell separator.
- the stainless steel for a solid polymer fuel cell separator according to the above invention, wherein the stainless steel contains, in addition to the composition, at least one selected from the following groups (1) to (4): It is.
- the present invention provides the above-mentioned invention, wherein, among the oxygen contained in the passive film, oxygen present in a metal oxide state: O (M) and oxygen present in a metal hydroxide state: O (H) is a stainless steel for polymer electrolyte fuel cell separators in which the atomic ratio of O (M) / O (H) is 0.9 or less.
- the present invention is the stainless steel for a polymer electrolyte fuel cell separator according to the above invention, wherein the Cr force is 20 to 45% by mass.
- FIG. 1 is a perspective view schematically showing an example of a polymer electrolyte fuel cell.
- Figure 2 A cross-sectional view schematically showing a sample used for measuring contact resistance.
- the present inventors have conducted intensive studies on stainless steel separators for exhibiting high corrosion resistance while keeping the contact resistance low, from the viewpoint of the components of the stainless steel and the components of the passive film. As a result, they found that contact resistance was significantly reduced by adjusting the composition of the passive film formed on the surface of high-purity ferritic stainless steel containing Mo.
- Masuko and other materials are annealed (950 ° C, 2 minutes) in an atmosphere of 75% by volume H 2 + 25% by volume N 2 with a dew point of 60 ° C, so-called Bright Annealing, B A). Further, nitric acid 10 wt%, hydrochloric acid 50 wt%, with an acidic aqueous solution containing 1 mass 0/0 picric acid, various temperatures for these materials, after performing an etching process in time, pure water cleaning, It was dried with cold air and used for measurement of contact resistance. At the same time, with a portion of the sample wet grinding, generally used mixed acid solution pickling stainless steel (8 wt% nitric acid + 2.5 wt. / 0 hydrofluoric acid, 55 ° C) 300 seconds in a After immersion and pickling, they were washed with pure water, dried with cold air, and subjected to contact resistance measurement.
- mixed acid solution pickling stainless steel 8 wt% nitric acid + 2.5 wt.
- the contact resistance values were calculated based on the measured values obtained six times while exchanging one set of two test pieces 8, and the average value is shown in Table 1.
- the measurement was performed, and the contact resistance value was calculated. The results are shown in Table 1. If the contact resistance value is 10 m ⁇ ⁇ cm 2 or less, there is almost no adverse effect on the characteristics of the fuel cell.
- the passivation film after the etching and pickling treatments is It was measured by spectroscopy (photoelectron spectroscopy), and the spectral intensity of Fe, Cr, and A1 in the passive film (that is, in the oxidized state) was calculated by the peak separation method.
- the atomic ratios Cr / Fe and A1Z (Cr + Fe) were calculated from the vector intensity and the relative sensitivity of each element (ie, the spectral intensity and the conversion factor of the number of atoms). The results are shown in Table 1.
- O (oxygen) contained in the passive film the oxygen present in the form of a metal oxide: O (M) and the oxygen present in the form of a metal hydroxide: O (H) was separated into peaks, and the atomic ratio O (M) / O (H) was calculated from the spectrum intensity. The results are shown in Table 1.
- the photoelectron spectrometer used in this experiment was AXIS-HS manufactured by KRAT0S, and measurement was performed under the conditions of an acceleration voltage of 15 kV and a current density of 5 mA using the A1-Ka ray as an excitation source.
- software attached to the apparatus was used for the peak separation of each element.
- the contact resistance value is reduced by etching the stainless steel sheet.
- the contact resistance value of the stainless steel sheet is 10 m ⁇ ⁇ cm 2 or less.
- the contact resistance is reduced by the pickling treatment generally used for pickling stainless steel, the Cr / Fe ratio is less than 1, and the contact angle resistance is not sufficiently reduced.
- the atomic ratio (O (M) ZOO!) Is 0.9 or less, the contact resistance is further reduced to 8 ⁇ -cm 2 or less.
- stainless steel with BA finish contains A1 in the passive film
- the contact resistance value also decreases.
- the stainless steel with BA finish The contact resistance of the steel sheet is less than 10 m ⁇ ⁇ cm 2 .
- the contact resistance value is 10 m ⁇ ⁇ cm 2 or less, there is almost no adverse effect on the characteristics of the fuel cell.
- C and N both react with Cr in stainless steel and precipitate at the grain boundaries as Cr carbonitrides, resulting in lower corrosion resistance. Therefore, C, N Are preferably as small as possible. If C: 0.03% by mass or less and N: 0.03% by mass or less, the corrosion resistance is not significantly reduced. When the sum of the C content and the N content (hereinafter, referred to as C + N) exceeds 0.03% by mass, cracks generated when the separator is pressed are significantly increased. Therefore, C + N is set to 0.03% by mass or less. Preferably, C: 0.015% by mass or less, N: 0.015% by mass. / 0 or less, C + N: 0.02% by mass or less.
- Cr is an element necessary for ensuring the corrosion resistance of stainless steel sheets. If the Cr content is less than 16% by mass, it cannot be used for a long time as a separator. If the Cr content is less than 16% by mass, it is difficult to adjust the atomic ratio Cr / Fe of the passivation film to 1 or more to make the contact resistance 10 m ⁇ ⁇ cm 2 or less. On the other hand, if the Cr content exceeds 45% by mass, toughness is reduced due to precipitation of the ⁇ phase. Therefore, the Cr content was set to 16 to 45% by mass. When long-term durability on the order of tens of thousands of hours is required, a higher Cr content is more advantageous from the viewpoint of corrosion resistance. Therefore, the content is preferably 20 to 45% by mass. Further, the content is preferably 22 to 35% by mass.
- Mo is an element effective in improving the crevice corrosion resistance of stainless steel sheets. In order to exhibit this effect, it is necessary to contain 0.1% by mass or more. On the other hand, if it is added in excess of 5.0% by mass, the stainless steel becomes extremely brittle and production becomes difficult. Therefore, the Mo content was set to 0.1 to 5.0% by mass. Preferably 0.5 to 3.0 wt%. In the stainless steel for separator according to the present invention, it is desirable that the content of the following components be defined in addition to the above-described red iron.
- the content is preferably 0.01% by mass or more. However, if it is contained excessively, the stainless steel sheet becomes harder and ductility is reduced. Therefore, the upper limit of the Si content is preferably set to 1.0% by mass. More preferably, it is 0.01 to 0.6% by mass.
- Mn combines with S and has the effect of reducing S dissolved in stainless steel, it is an effective element for suppressing grain boundary segregation of S and preventing cracking during hot rolling. .
- the content is preferably 0.01% by mass or more. If the Mn content is 1.0% by mass or less, this effect is sufficiently exerted. The preferred properly is 0.001 to 0.8 mass 0/0.
- A1 is an element effective for deoxidation in the steelmaking process, and its effect requires 0.001% by mass or more. On the other hand, if the content exceeds 0.2% by mass, the effect is saturated and the cost is increased. Therefore, the A1 content is 0.001 to 0.2 mass. / 0 is preferable.
- Ti and Nb fix C and N in stainless steel as carbonitride, It is an element effective for improving the loess formability.
- the C content and N content satisfy the above ranges and Ti or Nb is added, the effect will be improved if the Ti content is 0.01% by mass or more or the Nb content is 0.01% by mass or more. Be demonstrated.
- Ti and Nb are added, the effect is exhibited if the total content of Ti and Nb is 0.01% by mass or more.
- Ti or Nb is added, the Ti content is 0.5 mass. / 0 or Nb: If the content exceeds 0.5% by mass, the effect is saturated.
- Ti and Nb are added, the effect is saturated when the total of Ti and Nb exceeds 0.5% by mass.
- Ti or Nb when Ti or Nb is added, Ti is contained at 0.01 to 0.5% by mass or Nb is contained at 0.01 to 0.5% by mass, and when Ti and Nb are added, Ti and Nb are added. It is preferable that the total content be 0.01 to 0.5% by mass.
- each of Ca, Mg, REM (that is, rare earth element) and B is 0.1% by mass or less.
- Ni 1% by mass or less may be added for the purpose of improving the toughness of the stainless steel sheet.
- Ag 1 mass to reduce contact resistance. / 0 or less, Cu: 5 mass% / 0 or less, and V: 0.5 mass% or less for the purpose of finely dispersing Ag.
- the steel sheet of the present invention is a ferrite-based stainless steel sheet having a ferrite structure from the above-described component range of the present invention.
- the atomic ratio Cr / Fe needs to be 1 or more.
- O (oxygen) contained in the passive film can also reduce contact resistance. It is an important factor.
- the atomic ratio O between the oxygen present in the metal oxide state (ie, O (M)) and the oxygen present in the metal hydroxide state (ie, O (H)) It is effective to lower (M) ZO (H).
- a contact resistance value of 8 ⁇ ⁇ cm 2 or less can be obtained.
- the production conditions of the steel of the present invention are not particularly limited, and a general production method of ferritic stainless steel can be used.
- the method for producing the stainless steel for a separator of the present invention all known methods can be applied, and there is no particular limitation. For example, it is preferable to melt in a converter and perform secondary refining by strong agitation * vacuum oxygen decarburization treatment (S SV OD).
- the cycling method is preferably a continuous molding method in terms of productivity and quality.
- the slab obtained by the forging is heated to, for example, 100 to 125 ° C., and is hot rolled to have a desired thickness by hot rolling.
- This hot-rolled sheet is hot-rolled at 800 to 1150 ° C, pickled, cold-rolled to a predetermined product thickness, or further annealed at 800 to 1150 ° C.
- the product is preferably further subjected to an acid washing treatment.
- two or more times of cold rolling including intermediate annealing may be performed as necessary depending on production reasons.
- the total rolling reduction in the cold rolling step comprising one or more cold rollings is 60% or more, preferably 70% or more.
- light temper rolling skin pass rolling, skin pass rolling, etc.
- the stainless steel sheet obtained in this manner be used as a separator by forming a gas flow path by press working or the like, and then further adjusting the composition of the passive film.
- nitric acid + hydrofluoric acid aqueous solution good results were obtained with an acid solution in which the concentration of hydrofluoric acid was 1.5 times or more that of nitric acid.
- the preferred temperature of the acid solution in the case of the aqueous solution of nitric acid + hydrochloric acid and the aqueous solution of nitric acid + hydrofluoric acid is 45 or more. The higher the temperature of the acid solution, the shorter the treatment time.
- the treatment liquid used in the treatment of the present invention is not limited to these, and various kinds of acids or acids may be used in the case of treatment by immersion according to the composition and surface finish of the material stainless steel. , Composition, acid solution temperature and treatment time. When processing by electrolysis, the composition of various electrolytes and Solution conditions, acid solution temperature, treatment time, etc. can be selected.
- Such adjustment of the composition of the passive film may be performed before processing the stainless steel sheet into the separator, or may be performed after processing the stainless steel sheet into the separator.
- the passivation film may be damaged by processing. Therefore, it is preferable to perform a composition adjustment process after processing into a separator.
- a stainless steel having the components shown in Table 2 was melted by a converter and strong stirring vacuum-oxygen decarburization (abbreviated as SS-VOD). Slab. After heating the slab to 1250 ° C, it was hot-rolled into a hot-rolled stainless steel sheet with a thickness of 4 mm, and further annealed (850-1100 ° C) and pickled. Next, the thickness is reduced to 0.3IM1 by cold rolling, and further annealed (
- temper rolling was performed to produce a so-called 2B-finished cold-rolled stainless steel sheet.
- the center of the obtained cold rolled stainless steel sheet in the sheet width direction and the center in the longitudinal direction Four 200ran X 200mm test pieces were cut out from the part.
- Four test pieces cut out from cold-rolled stainless steel sheets of steel numbers 1 to 9 were pressed to obtain separators having a predetermined shape. After that, for each steel number, the composition ratio of the passive film was adjusted on some of the separators to adjust the atomic ratio Cr / Fe.
- A 10% by mass of nitric acid and 50% by weight of hydrochloric acid.
- the cathode side flow of air, to the anode side is supplied after humidified by a bubbler holding ultrapure water containing (purity 99.9999 vol 0/0) to 80 ⁇ 1 ° C, Denkomo density 0.4 A cm 2 (Condition 1) and the output voltage of 0.7AZcm 2 (Condition 2) were measured.
- a stainless steel plate (equivalent to SUS304) is caloried into the same shape as steel numbers 1 to 9 above, and then the surface is gold-plated (thickness: about ⁇ . ⁇ ⁇ ), and is 3 mm wide 2 mm on one side of the graph eye bets plate, with a separator arranged 17 rows with grooves 2 mm spacing height lmm, current density 0. 4 a / cm 2 Oyopi 0.7 a // The output voltage in cm 2 was measured. The method of measuring the output voltage is the same as that for steel numbers 1 to 9 above.
- a stainless steel satisfying the composition range of the present invention (i.e., steel numbers 3 to 6 and 9) was treated with the liquid A or B to adjust the composition of the passive film.
- Sepa with atomic ratio Cr / Fe of 1 or more A single cell using a radiator has a low contact resistance, and can obtain the same output voltage as the gold-plated separator ⁇ ⁇ ⁇ ⁇ ⁇ the graphite plate separator in both the initial output voltage and the output voltage after 2,000 hours. It was at a level that could withstand practical use.
- the stainless steel satisfies the component range of the present invention (that is, steel Nos. 3 to 6 and 9), it is generally used in the case where the passivation film composition adjustment treatment is not performed or when pickling stainless steel.
- pickling the atomic ratio CrZFe of the passivation film was low, and the initial output voltage was lower than that of the gold-plated separator / graphite plate separator.
- the hot-rolled stainless steel sheet used in Example 1 was cold-rolled to a thickness of 0.2 mm, and further annealed (900 to 1000 ° C for 2 minutes) in an ammonia decomposition gas having a dew point of 60 ° C to obtain a so-called BA.
- the finished cold rolled stainless steel sheet was used. Annealing As a result, a 2 to 10 nm BA film is formed.
- a test piece was taken from the obtained cold-rolled stainless steel sheet in the same manner as in Example 1 to obtain a separator having a predetermined shape.
- the Cr / Fe ratio, O (M) / O (H) ratio, and Al / (Cr + Fe) ratio of the passive film of this separator were calculated. Further, the contact resistance was measured.
- the separator shape and forming method, the passivation film composition adjustment treatment, pickling treatment, the method for measuring the content of each element, and the method for measuring contact resistance are the same as in Example 1, and therefore description thereof is omitted.
- the stainless steel satisfying the component range of the present invention (that is, steel numbers 3 to 6 and 9) is treated with the liquid A or B, A single cell using a separator with a Cr / Fe ratio of 1 or more and an Al / (Cr + Fe) ratio of 0.10 or less by adjusting the composition of the passive film has a low contact resistance and an initial output voltage.
- the output voltage after 2,000 hours had passed was equivalent to that of the gold-plated separator / graphite plate separator, and was at a level sufficient for practical use.
- the initial output voltage after about 2,000 hours has passed regardless of whether or not the passivation film composition was adjusted. The output voltage was lower than that of the gold-plated separator / graphite plate separator.
- the passivation film composition adjustment treatment was not performed, the acid generally used for pickling stainless steel was used.
- the atomic ratio A1Z (Cr + Fe) of the passive film is high and the contact resistance is high.
- the output voltage after the initial 200 hours is the value of the gold-plated separator. It was lower than that of the separator on the iron plate.
- a stainless steel for a polymer electrolyte fuel cell separator having a low contact resistance value and excellent corrosion resistance can be obtained. Therefore, it has become possible to provide an inexpensive stainless steel separator to polymer electrolyte fuel cells, which used to use expensive graphite separators due to durability issues.
- the present invention is not limited to a polymer electrolyte fuel cell separator, but can be widely used as an electrical component made of stainless steel having electrical conductivity.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Fuel Cell (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002503030A CA2503030C (en) | 2003-10-07 | 2004-06-09 | Stainless steel for proton-exchange membrane fuel cell separator and proton-exchange membrane fuel cell using the same |
US10/533,609 US8900379B2 (en) | 2003-10-07 | 2004-06-09 | Stainless steel for solid polymer fuel cell separator and solid polymer typefuel cell using the stainless steel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003348772A JP4496750B2 (ja) | 2002-10-07 | 2003-10-07 | 固体高分子型燃料電池セパレータ用ステンレス鋼とそのステンレス鋼を用いた固体高分子型燃料電池 |
JP2003-348772 | 2003-10-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005035816A1 true WO2005035816A1 (ja) | 2005-04-21 |
Family
ID=34430983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/008401 WO2005035816A1 (ja) | 2003-10-07 | 2004-06-09 | 固体高分子型燃料電池セパレータ用ステンレス鋼およびそのステンレス鋼を用いた固体高分子型燃料電池 |
Country Status (3)
Country | Link |
---|---|
US (1) | US8900379B2 (ja) |
CA (1) | CA2503030C (ja) |
WO (1) | WO2005035816A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012046879A1 (ja) | 2010-10-08 | 2012-04-12 | Jfeスチール株式会社 | 耐食性および電気伝導性に優れたフェライト系ステンレス鋼とその製造方法、固体高分子型燃料電池セパレータおよび固体高分子型燃料電池 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100777123B1 (ko) * | 2007-04-18 | 2007-11-19 | 현대하이스코 주식회사 | 연료전지용 스테인리스강 분리판 및 그 제조방법 |
JP4485552B2 (ja) * | 2007-08-03 | 2010-06-23 | 本田技研工業株式会社 | 燃料電池用セパレータの製造方法 |
US20090286107A1 (en) * | 2008-05-13 | 2009-11-19 | Ut-Battelle, Llc | Ferritic Alloy Compositions |
KR100993412B1 (ko) | 2008-12-29 | 2010-11-09 | 주식회사 포스코 | 고분자 연료전지 분리판용 스테인리스강 및 그 제조방법 |
KR101231462B1 (ko) * | 2009-07-30 | 2013-02-07 | 제이에프이 스틸 가부시키가이샤 | 도전성과 연성이 우수한 연료 전지 세퍼레이터용 스테인리스강 및 그 제조 방법 |
KR101319384B1 (ko) * | 2010-08-03 | 2013-10-22 | 삼성에스디아이 주식회사 | 연료 전지용 세퍼레이터 및 이를 포함하는 연료 전지 시스템 |
CN103717772B (zh) * | 2011-07-29 | 2016-10-26 | 杰富意钢铁株式会社 | 燃料电池隔板用不锈钢 |
JP6323624B1 (ja) | 2016-06-10 | 2018-05-16 | Jfeスチール株式会社 | 燃料電池のセパレータ用ステンレス鋼板およびその製造方法 |
KR102165049B1 (ko) | 2016-06-10 | 2020-10-13 | 제이에프이 스틸 가부시키가이샤 | 연료 전지의 세퍼레이터용 스테인리스 강판 및 그의 제조 방법 |
JP7064723B2 (ja) | 2017-03-31 | 2022-05-11 | 株式会社Flosfia | 成膜方法 |
WO2018199327A1 (ja) | 2017-04-28 | 2018-11-01 | 株式会社Flosfia | 導電性部材およびその製造方法 |
GB2565370B (en) * | 2017-08-11 | 2020-10-07 | Intelligent Energy Ltd | Fuel cell units having angled offset flow channels |
US20190165383A1 (en) * | 2017-11-29 | 2019-05-30 | Flosfia Inc. | Layered structure, electronic device including layered structure, system including electronic device, and method of manufacturing layered structure |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002013300A1 (en) * | 2000-08-05 | 2002-02-14 | Ineos Chlor Limited | Stainless steel substrate treatment |
JP2002270196A (ja) * | 2001-03-07 | 2002-09-20 | Matsushita Electric Ind Co Ltd | 高分子電解質型燃料電池およびその運転方法 |
JP2003223904A (ja) * | 2001-02-22 | 2003-08-08 | Jfe Steel Kk | 燃料電池用セパレータとその製造方法および固体高分子型燃料電池 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1117882C (zh) * | 1999-04-19 | 2003-08-13 | 住友金属工业株式会社 | 固体高分子型燃料电池用不锈钢材 |
US20030170526A1 (en) * | 2000-08-05 | 2003-09-11 | Ineos Chlor Limited | Substrate treatment |
CA2372326C (en) * | 2001-02-22 | 2007-09-11 | Kawasaki Steel Corporation | Stainless steel separator for fuel cells, method for making the same, and solid polymer fuel cell including the same |
-
2004
- 2004-06-09 CA CA002503030A patent/CA2503030C/en not_active Expired - Fee Related
- 2004-06-09 WO PCT/JP2004/008401 patent/WO2005035816A1/ja active Application Filing
- 2004-06-09 US US10/533,609 patent/US8900379B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002013300A1 (en) * | 2000-08-05 | 2002-02-14 | Ineos Chlor Limited | Stainless steel substrate treatment |
JP2003223904A (ja) * | 2001-02-22 | 2003-08-08 | Jfe Steel Kk | 燃料電池用セパレータとその製造方法および固体高分子型燃料電池 |
JP2002270196A (ja) * | 2001-03-07 | 2002-09-20 | Matsushita Electric Ind Co Ltd | 高分子電解質型燃料電池およびその運転方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012046879A1 (ja) | 2010-10-08 | 2012-04-12 | Jfeスチール株式会社 | 耐食性および電気伝導性に優れたフェライト系ステンレス鋼とその製造方法、固体高分子型燃料電池セパレータおよび固体高分子型燃料電池 |
US9587297B2 (en) | 2010-10-08 | 2017-03-07 | Jfe Steel Corporation | Ferritic stainless steel excellent in corrosion resistance and conductivity and method for manufacturing the same, separator of proton-exchange membrane fuel cell and proton-exchange membrane fuel cell |
Also Published As
Publication number | Publication date |
---|---|
US20060105218A1 (en) | 2006-05-18 |
CA2503030A1 (en) | 2005-04-21 |
US8900379B2 (en) | 2014-12-02 |
CA2503030C (en) | 2009-05-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1235290B1 (en) | Stainless steel separator for fuel cells, method for making the same, and solid polymer fuel cell including the same | |
CN102471848B (zh) | 燃料电池隔板用不锈钢及其制造方法 | |
JP4496750B2 (ja) | 固体高分子型燃料電池セパレータ用ステンレス鋼とそのステンレス鋼を用いた固体高分子型燃料電池 | |
EP2667439A1 (en) | Method for producing stainless steel for fuel cell separators, stainless steel for fuel cell separators, fuel cell separator, and fuel cell | |
WO2005090626A1 (ja) | 通電部材用金属材料、それを用いた燃料電池用セパレータおよびその燃料電池 | |
WO2005035816A1 (ja) | 固体高分子型燃料電池セパレータ用ステンレス鋼およびそのステンレス鋼を用いた固体高分子型燃料電池 | |
JP2012177157A (ja) | 固体高分子形燃料電池セパレータ用ステンレス鋼およびその製造方法 | |
JP3922154B2 (ja) | 固体高分子型燃料電池セパレータ用ステンレス鋼とその製造方法および固体高分子型燃料電池 | |
JP2007254795A (ja) | 固体高分子形燃料電池およびそのセパレータに好適なステンレス鋼 | |
JP4967831B2 (ja) | 固体高分子形燃料電池セパレータ用フェライト系ステンレス鋼およびそれを用いた固体高分子形燃料電池 | |
JP4930222B2 (ja) | 固体高分子形燃料電池セパレータ用オーステナイト系ステンレス鋼およびそれを用いた固体高分子形燃料電池 | |
CN110199047B (zh) | 具有优异的接触电阻的用于聚合物燃料电池隔板的不锈钢及其制造方法 | |
JP2005166276A (ja) | 固体高分子型燃料電池セパレータ用ステンレス鋼,それを用いた固体高分子型燃料電池セパレータおよび固体高分子型燃料電池 | |
JP2004269969A (ja) | 固体高分子型燃料電池用セパレータおよびその製造方法 | |
JP2005089800A (ja) | 固体高分子型燃料電池セパレータ用ステンレス鋼およびそれを用いた固体高分子型燃料電池 | |
JP5560533B2 (ja) | 固体高分子形燃料電池セパレータ用ステンレス鋼およびそれを用いた固体高分子形燃料電池 | |
JP5217755B2 (ja) | 燃料電池セパレータ用ステンレス鋼および燃料電池用セパレータ | |
JP5703560B2 (ja) | 導電性に優れた燃料電池セパレータ用ステンレス鋼板 | |
JP6648273B2 (ja) | 親水性および接触抵抗が向上した高分子燃料電池の分離板用ステンレス鋼およびその製造方法 | |
KR102497442B1 (ko) | 접촉저항이 향상된 고분자 연료전지 분리판용 오스테나이트계 스테인리스강 및 그 제조 방법 | |
JP2008103136A (ja) | 燃料電池、燃料電池の製造方法及び燃料電池車両 | |
CN114730892A (zh) | 用于制造聚合物燃料电池隔离件用不锈钢的方法 | |
JP2008059978A (ja) | 燃料電池、燃料電池の製造方法及び燃料電池車両 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 2503030 Country of ref document: CA |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
ENP | Entry into the national phase |
Ref document number: 2006105218 Country of ref document: US Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10533609 Country of ref document: US |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 10533609 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |