CN101488571A - Surface treatment process for molten carbonate fuel cell stainless steel bi-polar plate - Google Patents
Surface treatment process for molten carbonate fuel cell stainless steel bi-polar plate Download PDFInfo
- Publication number
- CN101488571A CN101488571A CNA200810010112XA CN200810010112A CN101488571A CN 101488571 A CN101488571 A CN 101488571A CN A200810010112X A CNA200810010112X A CN A200810010112XA CN 200810010112 A CN200810010112 A CN 200810010112A CN 101488571 A CN101488571 A CN 101488571A
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- China
- Prior art keywords
- stainless steel
- fuel cell
- molten carbonate
- carbonate fuel
- surface treatment
- 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.)
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 37
- 239000010935 stainless steel Substances 0.000 title claims abstract description 34
- 239000000446 fuel Substances 0.000 title claims abstract description 29
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 27
- 238000004381 surface treatment Methods 0.000 title claims description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 44
- 238000000576 coating method Methods 0.000 claims abstract description 44
- 229910015372 FeAl Inorganic materials 0.000 claims abstract description 18
- 238000005260 corrosion Methods 0.000 claims abstract description 17
- 230000007797 corrosion Effects 0.000 claims abstract description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 9
- 238000005275 alloying Methods 0.000 claims description 8
- 239000011247 coating layer Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 5
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000002194 synthesizing effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 8
- -1 304 Inorganic materials 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 description 13
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 238000000151 deposition Methods 0.000 description 12
- 238000005498 polishing Methods 0.000 description 12
- 238000004062 sedimentation Methods 0.000 description 7
- 244000137852 Petrea volubilis Species 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- 230000008021 deposition Effects 0.000 description 6
- 230000004927 fusion Effects 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000003973 paint Substances 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910010093 LiAlO Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Fuel Cell (AREA)
Abstract
The invention provides a method for processing the surface of a stainless steel bipolar plate of a molten carbonate fuel cell, comprising the following steps: preparing a FeAl corrosion resistant coating on the surface of the bipolar plate with the thickness of 40-100mum.The FeAl corrosion resistant coating is prepared on the surface of the bipolar plate of the molten carbonate fuel cell. The coating can be applied to the surface of various stainless steels (such as 304, 316L, and 310 type stainless steel). With the thickness above 40mum, the coating can protect the base material of stainless steel effectively. The method has the advantages of simple technique, low processing cost, excellent molten carbonate corrosion resistance performance of the coating and the like.
Description
Technical field
The present invention relates to fuel cell technology, provide a kind of especially, make bipolar plate of stainless steel have good anti-corrosion by processing to the molten carbonate fuel cell stainless steel bi-polar plate surface.
Background technology
Fuel cell is a kind of Blast Furnace Top Gas Recovery Turbine Unit (TRT) that fuel and oxygen or airborne chemical energy is converted into electric energy by electrochemical reaction.The a kind of of battery acts as a fuel, molten carbonate fuel cell (MCFC) need not to use characteristics such as noble metal and environmental friendliness and comes into one's own with generating efficiency height, electro-catalysis, become beautiful since the eighties, day, the civilian power generation technology given priority to of Europe, and it can be a fuel with coal gas directly, is particularly suitable for China's national situation.MCFC is a kind of high-temperature fuel cell, and working temperature is 600-700 ℃, and it mainly is made up of porous metals anode, porous oxide negative electrode, electrolyte panel and conductive bipolar plate etc.At present the MCFC technology of preparing is ripe relatively, but the low life-span of battery, expensive its commercialization process that still seriously hindered.Wherein, the corrosion of the battery material that fused carbonate electrolyte causes is an one of the main reasons, and the corrosion of battery material mainly comprises the corrosion etc. of dissolving, anode and the bipolar plate material of oxide coated cathode.Bipolar plates double as battery current collector and division board.Current collector connects division board and electrode, and division board separating monomer battery, it mainly plays 3 kinds of effects, and the one, anode atmosphere is separated with negative electrode atmosphere, two provide electrically contacting between the cell, and three provide a wet envelope district.So just there are 3 different corrosive environments, i.e. anode region, cathodic region and wet envelope district.A kind of homogenous material or coating are difficult to satisfy different like this corrosive environments.Because total preferably material mechanical performance and cost are lower, at present bipolar plate material generally adopts stainless steel as 316 and 310 etc., but their decay resistance does not far satisfy the practicability requirement, and, therefore must seek suitable surface protection technique at high 2 orders of magnitude of comparable negative electrode one side of the corrosion rate of anode one side.Because wet envelope is distinguished the conductivity no requirement (NR), thus Alization thing coating generally adopted at this position, in the hope of forming Al
2O
3Diaphragm (is converted into LiAlO in the process under arms
2), can satisfy the practicability requirement.At present spraying, thermal diffusion or ion evaporation method are generally adopted in the surface treatment in wet envelope district.These method existence or shortcomings such as complex process or processing cost height.
Summary of the invention
The object of the present invention is to provide a kind of surface treatment method of molten carbonate fuel cell stainless steel bi-polar plate, this method can improve the decay resistance of metal.
The invention provides a kind of surface treatment method of molten carbonate fuel cell stainless steel bi-polar plate, at the surface preparation FeAl of described bipolar plates corrosion-resistant finishes, coating layer thickness 40～100 μ m; Coating layer thickness is preferably 60 ± 5 μ m.
The surface treatment method of molten carbonate fuel cell stainless steel bi-polar plate provided by the invention, described coating adopts high energy differential of the arc alloying process synthetic, synthesizing in power output is 210～1500W, voltage is 40～100V, frequency is to carry out under 250～2000Hz condition, need deposition-pre-grinding-deposit again in synthetic, the thickness of coating is regulated by power, voltage, time are controlled.
The surface treatment method of molten carbonate fuel cell stainless steel bi-polar plate provided by the invention, described power output is preferably 1000～1500W.
The surface treatment method of molten carbonate fuel cell stainless steel bi-polar plate provided by the invention, described voltage is preferably 60～80V.
The surface treatment method of molten carbonate fuel cell stainless steel bi-polar plate provided by the invention, described frequency is preferably 1000～2000Hz.
The surface treatment method of molten carbonate fuel cell stainless steel bi-polar plate provided by the invention feeds inert gas in building-up process, inert gas is argon gas or helium, is preferably argon gas.
The processing method on molten carbonate fuel cell stainless steel bi-polar plate provided by the invention surface, in the bipolar plate of stainless steel surface preparation FeAl anti-corrosion coating.It can be applied to all types of stainless steels (as 304,316L, 310 type stainless steels) surface.When the thickness of coating reaches more than the 40 μ m and can play fine protective effect to the base material stainless steel.
The present invention is an example to apply the FeAl coating at the 316L stainless steel surfaces, and coating is at 650 ℃, (0.62Li, 0.38K)
2CO
3Can form continuous protectiveness Al in the eutectic fused salt
2O
3Film, coating have excellent anti-fused carbonate corrosive nature, are metallurgical binding between coating and matrix.
The present invention has that technology is simple, processing cost is low, and coating has excellent advantages such as anti-fused carbonate corrosive nature.
Embodiment
Embodiment 1
Adopt diameter be FeAl alloy (composition the is Fe-38.26%Al) pole of 4mm as depositing electrode, use high energy differential of the arc alloying process and prepare the FeAl coating at the 316L stainless steel surfaces.The equipment power output is 1065W, and voltage is 80V, and frequency is 1500HZ, and argon flow amount is 101/min, and sedimentation time is 7min, needs the deposition of deposition-polishing-again in the preparation process, and the polishing number of times is 3 times, and Sand paper for polishing is 800#.In order to make the coating deposited surface Paint Gloss, under the constant condition of other technological parameter, voltage is transferred to 60V, inswept whole coating surface at last.Coating layer thickness is about 54 μ m, fine and close zero defect, and belong to metallurgical binding between matrix.Coating is at 650 ℃ of fusion 62mol%Li
2CO
3-38mol%K
2CO
3In formed continuous Al
2O
3Oxide layer has improved the corrosion resisting property of matrix alloy significantly.
Embodiment 2
Adopt diameter be FeAl alloy (composition the is Fe-38.26%Al) pole of 4mm as depositing electrode, use high energy differential of the arc alloying process and prepare the FeAl coating at the 316L stainless steel surfaces.The equipment power output is 1065W, and voltage is 60V, and frequency is 2000Hz, and argon flow amount is 101/min, and sedimentation time is 10min, needs the deposition of deposition-polishing-again in the preparation process, and the polishing number of times is 4 times, and Sand paper for polishing is 800#.Belong to metallurgical binding between coating and matrix, thickness is about 50 μ m, the fine and close zero defect of coating.Coating is at 650 ℃ of fusion 62mol%Li
2CO
3-38mol%K
2CO
3In formed continuous Al
2O
3Oxide layer has improved the corrosion resisting property of matrix alloy significantly.
Embodiment 3
Adopt diameter be FeAl alloy (composition the is Fe-38.26%Al) pole of 4mm as depositing electrode, use high energy differential of the arc alloying process and prepare the FeAl coating at the 316L stainless steel surfaces.The equipment power output is 1500W, and voltage is 80V, and frequency is 2000Hz, and argon flow amount is 10l/min, and sedimentation time is 8min, needs the deposition of deposition-polishing-again in the preparation process, and the polishing number of times is 4 times, and Sand paper for polishing is 800#.In order to make the coating deposited surface Paint Gloss, under the constant condition of other technological parameter, voltage is transferred to 60V at last, inswept whole coating surface, the time is 2min.Belong to metallurgical binding between coating and matrix, thickness is about 62 μ m, the fine and close zero defect of coating.Coating is at 650 ℃ of fusion 62mol%Li
2CO
3-38mol%K
2CO
3In formed continuous Al
2O
3Oxide layer has improved the corrosion resisting property of matrix alloy significantly.
Embodiment 4
Adopt diameter be FeAl alloy (composition the is Fe-38.26%Al) pole of 4mm as depositing electrode, use high energy differential of the arc alloying process and prepare the FeAl coating at the 316L stainless steel surfaces.The equipment power output is 1290W, and voltage is 80V, and frequency is 1000Hz, and argon flow amount is 121/min, and sedimentation time is 6min, needs the deposition of deposition-polishing-again in the preparation process, and the polishing number of times is 3 times, and Sand paper for polishing is 800#.In order to make the coating deposited surface Paint Gloss, under the constant condition of other technological parameter, voltage is transferred to 60V, inswept whole coating surface at last.Belong to metallurgical binding between coating and matrix, thickness is about 46 μ m, fine and close zero defect.Coating is at 650 ℃ of fusion 62mol%Li
2CO
3-38mol%K
2CO
3In formed continuous Al
2O
3Oxide layer has improved the corrosion resisting property of matrix alloy significantly.
Embodiment 5
Adopt diameter be FeAl alloy (composition the is Fe-38.26%Al) pole of 4mm as depositing electrode, use high energy differential of the arc alloying process and prepare the FeAl coating at the 316L stainless steel surfaces.The equipment power output is 1046W, and voltage is 80V, and frequency is 1000Hz, and argon flow amount is 121/min, and sedimentation time is 8min, needs the deposition of deposition-polishing-again in the preparation process, and the polishing number of times is 4 times, and Sand paper for polishing is 800#.Belong to metallurgical binding between coating and matrix, coating layer thickness is about 56 μ m, fine and close zero defect.Coating is at 650 ℃ of fusion 62mol%Li
2CO
3-38mol%K
2CO
3In formed continuous Al
2O
3Oxide layer has improved the corrosion resisting property of matrix alloy significantly.
Embodiment 6
Adopt diameter be FeAl alloy (composition the is Fe-38.26%Al) pole of 4mm as depositing electrode, use high energy differential of the arc alloying process and prepare the FeAl coating at the 316L stainless steel surfaces.The equipment power output is 1080W, and voltage is 80V, and frequency is 2000Hz, and argon flow amount is 101/min, and sedimentation time is 10min, needs the deposition of deposition-polishing-again in the preparation process, and the polishing number of times is 4 times, and Sand paper for polishing is 800#.Voltage is transferred to 60V, and inswept whole coating surface, sedimentation time are 2min.Belong to metallurgical binding between coating and matrix, coating layer thickness is about 75 μ m, fine and close no significant defect.Coating is at 650 ℃ of fusion 62mol%Li
2CO
3-38mol%K
2CO
3In formed continuous Al
2O
3Oxide layer has improved the corrosion resisting property of matrix alloy significantly.
Claims (9)
1, a kind of surface treatment method of molten carbonate fuel cell stainless steel bi-polar plate is characterized in that: at the surface preparation FeAl of described bipolar plates corrosion-resistant finishes, and coating layer thickness 40～100 μ m.
2, according to the surface treatment method of the described molten carbonate fuel cell stainless steel bi-polar plate of claim 1, it is characterized in that: described coating layer thickness is 60 ± 5 μ m.
3, according to the surface treatment method of the described molten carbonate fuel cell stainless steel bi-polar plate of claim 1, it is characterized in that: described coating adopts high energy differential of the arc alloying process synthetic, synthesizing in power output is 210～1500W, voltage is 40～100V, frequency is to carry out under 250～2000Hz condition, need deposition-pre-grinding-deposit again in synthetic, the thickness of coating is regulated by power, voltage, time are controlled.
4, according to the surface treatment method of the described molten carbonate fuel cell stainless steel bi-polar plate of claim 3, it is characterized in that: described power output is 1000～1500W.
5, according to the surface treatment method of the described molten carbonate fuel cell stainless steel bi-polar plate of claim 3, it is characterized in that: described voltage is 60～80V.
6, according to the surface treatment method of the described molten carbonate fuel cell stainless steel bi-polar plate of claim 3, it is characterized in that: described frequency is 1000～2000Hz.
7, according to the surface treatment method of the described molten carbonate fuel cell stainless steel bi-polar plate of claim 3, it is characterized in that: in building-up process, feed inert gas.
8, according to the surface treatment method of the described molten carbonate fuel cell stainless steel bi-polar plate of claim 7, it is characterized in that: described inert gas is argon gas or helium.
9, according to the surface treatment method of claim 7 or 8 described molten carbonate fuel cell stainless steel bi-polar plates, it is characterized in that: described inert gas is an argon gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810010112XA CN101488571A (en) | 2008-01-16 | 2008-01-16 | Surface treatment process for molten carbonate fuel cell stainless steel bi-polar plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810010112XA CN101488571A (en) | 2008-01-16 | 2008-01-16 | Surface treatment process for molten carbonate fuel cell stainless steel bi-polar plate |
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|---|---|
| CN101488571A true CN101488571A (en) | 2009-07-22 |
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|---|---|---|---|
| CNA200810010112XA Pending CN101488571A (en) | 2008-01-16 | 2008-01-16 | Surface treatment process for molten carbonate fuel cell stainless steel bi-polar plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994077A (en) * | 2010-10-27 | 2011-03-30 | 江苏科技大学 | High-temperature oxidation resisting intermetallic compound coating and preparation method thereof |
| CN101867051B (en) * | 2010-02-05 | 2012-07-04 | 大连理工大学 | Preparation method of composite soda blocking collector plate |
| CN109128199A (en) * | 2018-11-14 | 2019-01-04 | 广东石油化工学院 | A kind of electrode being used to prepare intermetallic Fe-Al compound coating and method |
-
2008
- 2008-01-16 CN CNA200810010112XA patent/CN101488571A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867051B (en) * | 2010-02-05 | 2012-07-04 | 大连理工大学 | Preparation method of composite soda blocking collector plate |
| CN101994077A (en) * | 2010-10-27 | 2011-03-30 | 江苏科技大学 | High-temperature oxidation resisting intermetallic compound coating and preparation method thereof |
| CN109128199A (en) * | 2018-11-14 | 2019-01-04 | 广东石油化工学院 | A kind of electrode being used to prepare intermetallic Fe-Al compound coating and method |
| CN109128199B (en) * | 2018-11-14 | 2022-02-01 | 广东石油化工学院 | Electrode and method for preparing iron-aluminum intermetallic compound coating |
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Open date: 20090722 |