CN109852932A - Hydrogen fuel battery metal bi-polar plate and preparation method thereof - Google Patents
Hydrogen fuel battery metal bi-polar plate and preparation method thereof Download PDFInfo
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 67
- 239000002184 metal Substances 0.000 title claims abstract description 67
- 239000000446 fuel Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 239000001257 hydrogen Substances 0.000 title claims abstract description 21
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 112
- 238000000576 coating method Methods 0.000 claims abstract description 112
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000000758 substrate Substances 0.000 claims abstract description 32
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 26
- 239000010439 graphite Substances 0.000 claims abstract description 26
- 238000004544 sputter deposition Methods 0.000 claims description 49
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 239000011651 chromium Substances 0.000 claims description 21
- 238000004062 sedimentation Methods 0.000 claims description 20
- 239000010936 titanium Substances 0.000 claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910010169 TiCr Inorganic materials 0.000 claims description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 229910052719 titanium Inorganic materials 0.000 claims description 10
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 244000137852 Petrea volubilis Species 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- 235000019441 ethanol Nutrition 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 229910001256 stainless steel alloy Inorganic materials 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims 1
- 229910052709 silver Inorganic materials 0.000 claims 1
- 239000004332 silver Substances 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 39
- 230000007797 corrosion Effects 0.000 abstract description 39
- 229910001220 stainless steel Inorganic materials 0.000 description 9
- 230000007704 transition Effects 0.000 description 9
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 8
- -1 argon ion Chemical class 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000007747 plating Methods 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
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- 238000012360 testing method Methods 0.000 description 3
- 238000004506 ultrasonic cleaning Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
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- 239000012528 membrane Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- 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
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Abstract
The invention discloses a kind of hydrogen fuel battery metal bi-polar plates and preparation method thereof, and the metal double polar plates including surface with coating, the coating is followed successively by silvering, TiCrN coating and graphite coating by metal bipolar plate surface outward.The present invention has excellent electric conductivity and corrosion resistance, and contact resistance is low, and film-substrate cohesion is good, good heat conductivity.
Description
Technical field
The present invention relates to fuel cell manufacture technical field, in particular to a kind of hydrogen fuel battery metal bi-polar plate and its system
Preparation Method.
Background technique
Key components and parts of the bipolar plates as hydrogen fuel cell, its role is to separate reaction gas, and will by flow field
Reaction gas imports fuel cell, supports membrane electrode, while needing to undertake heat dissipation and the drain function of entire hydrogen fuel cell.By
It is more in the function of bipolar plates, therefore high requirement is proposed to the performance of bipolar plates: need high conductivity, small contact electricity
Resistance, it is necessary to be the good conductor of heat, it is necessary to possess good runner design, good gas barrier property, while need good corrosion resistance
And mechanical performance, so only the cost of bipolar plates just accounts for the 30% of hydrogen fuel cell.At this stage, the hydrogen of China's independent development
Fuel battery double plates are based on graphite bi-polar plate, since graphite is more loose, to guarantee bipolar plates compactness, graphite bi-polar plate
Thickness is thicker, heavier-weight, so mitigating in hydrogen fuel cell, quality, to improve efficiency that there is also the relevant technologies difficult.
There are two main classes for metallic bipolar plate materials: first is that ferrous alloy, the mainly stainless steel of unlike material, such as 310,
316,904 stainless steels etc.；Second is that although light metal, such as Al, Ni, Ti alloy, metal double polar plates have many good qualities, but
Under hydrogen fuel cell faintly acid working environment, metal double polar plates corrosion resistance is poor.Therefore metal double polar plates use modified coating, lead to
It crosses in metal material substrate surface coating, whole plate is made to obtain good punching press mechanical property, electrical and thermal conductivity, corrosion resistance, resistance to
Gas permeability etc., the miniaturization and slimming for reaching bipolar plates require.
The coating of metal bipolar plate surface common are Cr coating, CrN coating, C coating, TiN coating, TiC coating etc., respectively
Coating has its advantage, but also all has that certain disadvantage or electric conductivity are insufficient or thermal conductivity is insufficient or corrosion-resistant
Property insufficient or film-substrate cohesion it is insufficient, therefore, it is necessary to develop a kind of metal double polar plates for taking into account various aspects of performance.
Summary of the invention
The purpose of the present invention is to provide a kind of hydrogen fuel battery metal bi-polar plates, have excellent electric conductivity and corrosion resistant
Corrosion energy, contact resistance is low, and film-substrate cohesion is good, good heat conductivity.
The present invention also provides the preparation methods of above-mentioned hydrogen fuel battery metal bi-polar plate.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of hydrogen fuel battery metal bi-polar plate, the metal double polar plates including surface with coating, the coating is by metal double polar plates
Surface is followed successively by silvering, TiCrN coating and graphite coating outward.
The present invention first processes silvering in metal bipolar plate surface, the effect of silvering be first have excellent conduction with
Heating conduction, contact resistance is low, and since substrate is metal, the film-substrate cohesion of processing silvering and substrate first is stronger, silver-colored
Extension characteristics are good, and the plated film dense uniform of formation, corrosion resistance is strong, protect together as last.
TiCrN coating be transition zone, by metal and it is nonmetallic form, one side metal part can securely be tied with silvering
It closes, film-substrate cohesion is strong, and another aspect non-metallic part can be firmly combined with C, improves the film-substrate cohesion of graphite coating, C material
It is loose to expect that the plated film formed has the characteristics that, if due to the direct plating graphite on silvering, the film base junction of graphite coating coating
Resultant force is weaker, is easily peeled off and falls, and the loose structure of graphite coating is also easy to so that corrosive deposit is directly through reaching most
Silvering afterwards, the silvering resistance to corrosion to be born is big, needs thicker silvering corrosion-resistant to reinforce, such cost is just
It is higher.And the stable for a long time corrosion resistance of relatively thin silvering is unable to satisfy.Therefore, stablize from cost and for a long time it is corrosion-resistant and
The angle of film-substrate cohesion is set out, and the present invention is provided with TiCrN transition zone, and TiCrN transition zone compactness is high, corrosion resistance
By force, although conductive capability and the capacity of heat transmission are slightly weak, comprehensively considering TiCrN transition zone part makes instead of silvering as transition zone
With, take into account it is conductive, thermally conductive and corrosion-resistant and improve film-substrate cohesion.
In addition, the present invention using tri- element transition zone of TiCrN rather than TiN or CrN Was Used transition zone, mainly because
Coating uniformity and compactness to be formed compared to Was Used transition zone, three element transition zones are obviously improved, and quality of forming film is high,
Permanent corrosion resistance is also more preferable.
Graphite coating conduction and good heat conductivity, contact resistance is low, at low cost, and graphite coating is placed on outermost layer, utilizes
The conduction and heating conduction of graphite coating, silvering is in most inner side, conductive and good heat conductivity, inside and outside using conductive and thermal conductivity
Can good coating, cooperate intermediate conduction and thermally conductive slightly weak TiCrN to cross coating, formed it is inside and outside conductive and thermally conductive excellent, it is thermally conductive
Channel is good, good heat dissipation, takes into account conductive, thermally conductive and corrosion-resistant and improves film-substrate cohesion, synthesis realizes excellent properties.
The material of the metal double polar plates is 316L stainless steel or titanium alloy.
The preparation method of hydrogen fuel battery metal bi-polar plate, includes the following steps:
(1) metal bipolar plate surface is pre-processed to obtain clean metal bipolar plate surface；
(2) it being put into the vacuum chamber of magnetic controlled sputtering device by pretreated metal double polar plates, vacuumizes；
(3) ion sputtering is cleaned；
(4) silver-colored target is opened, silvering sputtering is carried out；
(5) silver-colored target is closed, titanium and chromium target are opened, carries out TiCr coating pre-sputtering；
(6) it is passed through nitrogen, prepares TiCrN coating；
(7) nitrogen, titanium target and chromium target are closed；Carbon target is opened, graphite coating sputtering is carried out；
(8) carbon target, ion sputtering cleaning are closed, open air valve takes out product.
In step (1), the pretreatment are as follows: first polished with sand paper metal bipolar plate surface, then polishing machine polishes, and steams
Distilled water is rinsed, and is then immersed in ethyl alcohol and acetone soln and is cleaned by ultrasonic respectively, is dried.
In step (2), vacuumize as pressure in vacuum cavity is evacuated to 2 × 10-5Until Torr.
In step (3) and step (8), the ion sputtering cleaning cleans 20-30min using argon ion sputtering.
In step (4), the parameter of silvering sputtering are as follows: silver-colored target current size 1-6A, substrate bias -80V, sedimentation time
10-20min。
In step (5), the parameter of TiCr coating pre-sputtering are as follows: Cr target current 2-8A, Ti target current 1-6A, substrate bias-
80V, sedimentation time 5-20min.
In step (6), preparation TiCrN plates layer parameter are as follows: nitrogen flow is adjusted by OEM system, is adjusted OEM value and is
40-80% keeps Cr target current constant, and Ti target current is adjusted to 2-8A, substrate bias -80V, sedimentation time 60-300min.
In step (7), the parameter of graphite coating sputtering are as follows: carbon target size of current 1-6A, substrate bias -80V, sedimentation time
15-25min。
The beneficial effects of the present invention are: having excellent electric conductivity and corrosion resistance, contact resistance is low, and film base junction is closed
Power is good, good heat conductivity.
Detailed description of the invention
Fig. 1 is a kind of surface topography map (1000 ×) of coating of the present invention.
Specific embodiment
Below by specific embodiment, technical scheme of the present invention will be further explained in detail.
In the present invention, if not refering in particular to, used raw material and equipment etc. are commercially available or commonly used in the art.
Method in following embodiments is unless otherwise instructed the conventional method of this field.
Embodiment 1:
A kind of hydrogen fuel battery metal bi-polar plate, the metal double polar plates including surface with coating, the material of the metal double polar plates
For 316L stainless steel, metal double polar plates specification 20mm × 20mm × 8mm, the coating is followed successively by outward by metal bipolar plate surface
Silvering, TiCrN coating and graphite coating.
Preparation method includes the following steps:
(1) metal bipolar plate surface is pre-processed to obtain clean metal bipolar plate surface；The pretreatment are as follows: first use
Sand paper polishes to metal bipolar plate surface, and then polishing machine polishes, distilled water flushing, then immerses ethyl alcohol and acetone soln respectively
Middle ultrasonic cleaning 30min, drying.
(2) being put into the vacuum chamber of magnetic controlled sputtering device by pretreated metal double polar plates, by pressure in vacuum cavity
It is evacuated to 2 × 10-5Until Torr.
(3) 20min is cleaned using argon ion sputtering to metal double polar plates.
(4) silver-colored target is opened, silvering sputtering, the parameter of silvering sputtering are as follows: silver-colored target current size 1A, matrix are inclined are carried out
Pressure -80V, sedimentation time 20min.
(5) silver-colored target is closed, titanium and chromium target are opened, carries out TiCr coating pre-sputtering, the parameter of TiCr coating pre-sputtering are as follows: Cr
Target current 2A, Ti target current 1A, substrate bias -80V, sedimentation time 20min.
(6) be passed through nitrogen, prepare TiCrN coating, preparation TiCrN plates layer parameter are as follows: nitrogen flow by OEM system come
It adjusts, adjusting OEM value is 40%, keeps Cr target current constant, Ti target current is adjusted to 2A, substrate bias -80V, sedimentation time
300min。
(7) nitrogen, titanium target and chromium target are closed；Carbon target is opened, graphite coating sputtering, the parameter of graphite coating sputtering are carried out
Are as follows: carbon target size of current 1A, substrate bias -80V, sedimentation time 25min.
(8) carbon target is closed, 20min is cleaned using argon ion sputtering, open air valve takes out product.
Embodiment 2:
A kind of hydrogen fuel battery metal bi-polar plate, the metal double polar plates including surface with coating, the material of the metal double polar plates
For titanium alloy, metal double polar plates specification 20mm × 20mm × 8mm, the coating is followed successively by silver-colored plating by metal bipolar plate surface outward
Layer, TiCrN coating and graphite coating.
Preparation method includes the following steps:
(1) metal bipolar plate surface is pre-processed to obtain clean metal bipolar plate surface；The pretreatment are as follows: first use
Sand paper polishes to metal bipolar plate surface, and then polishing machine polishes, distilled water flushing, then immerses ethyl alcohol and acetone soln respectively
Middle ultrasonic cleaning 30min, drying.
(2) being put into the vacuum chamber of magnetic controlled sputtering device by pretreated metal double polar plates, by pressure in vacuum cavity
It is evacuated to 2 × 10-5Until Torr.
(3) 30min is cleaned using argon ion sputtering to metal double polar plates.
(4) silver-colored target is opened, silvering sputtering, the parameter of silvering sputtering are as follows: silver-colored target current size 6A, matrix are inclined are carried out
Pressure -80V, sedimentation time 10min.
(5) silver-colored target is closed, titanium and chromium target are opened, carries out TiCr coating pre-sputtering, the parameter of TiCr coating pre-sputtering are as follows: Cr
Target current 8A, Ti target current 6A, substrate bias -80V, sedimentation time 5min.
(6) be passed through nitrogen, prepare TiCrN coating, preparation TiCrN plates layer parameter are as follows: nitrogen flow by OEM system come
It adjusts, adjusting OEM value is 80%, keeps Cr target current constant, Ti target current is adjusted to 8A, substrate bias -80V, sedimentation time
60min。
(7) nitrogen, titanium target and chromium target are closed；Carbon target is opened, graphite coating sputtering, the parameter of graphite coating sputtering are carried out
Are as follows: carbon target size of current 6A, substrate bias -80V, sedimentation time 15min.
(8) carbon target is closed, 30min is cleaned using argon ion sputtering, open air valve takes out product.
Embodiment 3:
A kind of hydrogen fuel battery metal bi-polar plate, the metal double polar plates including surface with coating, the material of the metal double polar plates
For 316L stainless steel, metal double polar plates specification 20mm × 20mm × 8mm, the coating is followed successively by outward by metal bipolar plate surface
Silvering, TiCrN coating and graphite coating.
Preparation method includes the following steps:
(1) metal bipolar plate surface is pre-processed to obtain clean metal bipolar plate surface；The pretreatment are as follows: first use
Sand paper polishes to metal bipolar plate surface, and then polishing machine polishes, distilled water flushing, then immerses ethyl alcohol and acetone soln respectively
Middle ultrasonic cleaning 30min, drying.
(2) being put into the vacuum chamber of magnetic controlled sputtering device by pretreated metal double polar plates, by pressure in vacuum cavity
It is evacuated to 2 × 10-5Until Torr.
(3) 25min is cleaned using argon ion sputtering to metal double polar plates.
(4) silver-colored target is opened, silvering sputtering, the parameter of silvering sputtering are as follows: silver-colored target current size 3A, matrix are inclined are carried out
Pressure -80V, sedimentation time 15min.
(5) silver-colored target is closed, titanium and chromium target are opened, carries out TiCr coating pre-sputtering, the parameter of TiCr coating pre-sputtering are as follows: Cr
Target current 4A, Ti target current 3A, substrate bias -80V, sedimentation time 10min.
(6) be passed through nitrogen, prepare TiCrN coating, preparation TiCrN plates layer parameter are as follows: nitrogen flow by OEM system come
It adjusts, adjusting OEM value is 70%, keeps Cr target current constant, Ti target current is adjusted to 4A, substrate bias -80V, sedimentation time
120min。
(7) nitrogen, titanium target and chromium target are closed；Carbon target is opened, graphite coating sputtering, the parameter of graphite coating sputtering are carried out
Are as follows: carbon target size of current 3A, substrate bias -80V, sedimentation time 20min.
(8) carbon target is closed, 25min is cleaned using argon ion sputtering, open air valve takes out product.
Coating surface morphology of the invention is as shown in Figure 1, properties of product are tested, with individual CrN coating, TiCrN plating
Layer, TiN coating, C coating are control.
1. development of anticorrosive performance
1.1 simulated battery cathode environments
The tafel curve measured by simulating cathode environment, we obtain following corrosion electric current density:
Corrosion of Stainless Steel current density is 5.1 × 10-5 A/cm-2,
Titanium alloy corrosion electric current density is 9.3 × 10-6 A/cm-2,
CrN corrosion of coating current density is 6.61 × 10-7 A/cm-2,
TiCrN corrosion of coating current density is 4.36 × 10-7 A/cm-2,
TiN corrosion of coating current density is 5.5 × 10-7 A/cm-2,
C corrosion of coating current density is 8.50 × 10-7 A/cm-2,
Ag-TiCrN-C corrosion of coating current density is 3.46 × 10-7 A/cm-2。
Coating all has biggish corrosion-resistant promotion to substrate, and Ag-TiCrN-C coating is promoted optimal.
The corrosion resistance characteristic of coating bipolar plates under long-term etching condition is observed by constant potential curve.Offer is provided
The constant voltage of 0.6v, we obtain, in the test process of two hours, several plating Lyer current densities first sharply decline, after
Gradually tend towards stability.Current density after wherein stainless steel is stablized is 6.8 × 10-5 A/cm-2, titanium alloy stablize after electric current it is close
Degree is 6.52 × 10-5 A/cm-2, and after the stabilization of other several coating (CrN coating, TiCrN coating, TiN coating, C coating)
Current density be about 5 × 10-6 A/cm-2, difference is little, and the current density after Ag-TiCrN-C coating is stablized is 9.83 × 10-7 A/cm-2, Ag-TiCrN-C coating has stable significantly improve to corrosion resistance.
1.2 simulated battery anode-contexts
The tafel curve measured by simulating anode-context, we obtain following corrosion electric current density:
Corrosion of Stainless Steel current density is 1.3 × 10-5 A/cm-2,
Titanium alloy corrosion electric current density is 8.6 × 10-5A/cm-2,
CrN corrosion of coating current density is 9. 5 × 10-7 A/cm-2,
TiCrN corrosion of coating current density is 8.2 × 10-7 A/cm-2,
TiN corrosion of coating current density is 1.58 × 10-6 A/cm-2,
C corrosion of coating current density is 2.9 × 10-6 A/cm-2,
Ag-TiCrN-C corrosion of coating current density is 4.05 × 10-7 A/cm-2,
Coating all has biggish corrosion-resistant promotion to substrate, and Ag-TiCrN-C coating is promoted optimal.
The corrosion resistance characteristic of coating bipolar plates under long-term etching condition is observed by constant potential curve.By mentioning
For the constant voltage of -0.1v, we are obtained, in the test process of two hours, several plating Lyer current densities first sharply decline,
It gradually tends towards stability afterwards.Current density after wherein stainless steel is stablized is 1.07 × 10-7 A/cm-2, titanium alloy stablize after electricity
Current density is 2.56 × 10-7 A/cm-2, and after the stabilization of several coating (CrN coating, TiCrN coating, TiN coating, C coating)
Current density be about -7 × 10-6 A/cm-2, difference is little, Ag-TiCrN-C coating stablize after current density be -4.62 ×
10-7 A/cm-2, Ag-TiCrN-C coating has stable significantly improve to corrosion resistance.
2. contact resistance is analyzed
Currently, the assembling force of hydrogen fuel cell pile is usually in 1.4 MPa or so, the 316L stainless steel contact resistance of non-coating
For 44.1 m Ω cm2, the titanium alloy contact resistance of non-coating is 60 m Ω cm2, TiN coating contact resistance is 18.9 m
Ω·cm2, CrN coating contact resistance is 25.2m Ω cm2, TiCrN coating contact resistance is 23.58 m Ω cm2, C coating
Contact resistance is 16.875 m Ω cm2, 8.95 m Ω cm of Ag-TiCrN-C coating contact resistance2.Ag- of the invention
The film-substrate cohesion of TiCrN-C coating is tested using WS-2005 scratching instrument, is added in scratch speed 3mm/min, scratch length 3mm
It carries under speed 50N/min test condition, critical load value is about 95N.
Above-mentioned embodiment is only a preferred solution of the present invention, not the present invention is made in any form
Limitation, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.
Claims (10)
1. a kind of hydrogen fuel battery metal bi-polar plate, the metal double polar plates including surface with coating, it is characterised in that: the coating
Silvering, TiCrN coating and graphite coating are followed successively by by metal bipolar plate surface outward.
2. hydrogen fuel battery metal bi-polar plate according to claim 1, it is characterised in that: the material of the metal double polar plates
For 316L stainless steel or titanium alloy.
3. the preparation method of hydrogen fuel battery metal bi-polar plate as described in claim 1, which is characterized in that including walking as follows
It is rapid:
(1) metal bipolar plate surface is pre-processed to obtain clean metal bipolar plate surface；
(2) it being put into the vacuum chamber of magnetic controlled sputtering device by pretreated metal double polar plates, vacuumizes；
(3) ion sputtering is cleaned；
(4) silver-colored target is opened, silvering sputtering is carried out；
(5) silver-colored target is closed, titanium and chromium target are opened, carries out TiCr coating pre-sputtering；
(6) it is passed through nitrogen, prepares TiCrN coating；
(7) nitrogen, titanium target and chromium target are closed；Carbon target is opened, graphite coating sputtering is carried out；
(8) carbon target, ion sputtering cleaning are closed, open air valve takes out product.
4. preparation method according to claim 3, it is characterised in that: in step (1), the pretreatment are as follows: first use sand paper
It polishes metal bipolar plate surface, then polishing machine polishes, distilled water flushing, then immerses in ethyl alcohol and acetone soln and surpasses respectively
Sound cleaning, drying.
5. preparation method according to claim 3, it is characterised in that: in step (2), vacuumize as by vacuum cavity internal pressure
Power is evacuated to 2 × 10-5Until Torr.
6. preparation method according to claim 3, it is characterised in that: in step (3) and step (8), the ion sputtering
Cleaning cleans 20-30min using argon ion sputtering.
7. preparation method according to claim 3, it is characterised in that: in step (4), the parameter of silvering sputtering are as follows: silver
Target current size 1-6A, substrate bias -80V, sedimentation time 10-20min.
8. preparation method according to claim 3, it is characterised in that: in step (5), the parameter of TiCr coating pre-sputtering
Are as follows: Cr target current 2-8A, Ti target current 1-6A, substrate bias -80V, sedimentation time 5-20min.
9. preparation method according to claim 3, it is characterised in that: in step (6), preparation TiCrN plates layer parameter are as follows: nitrogen
Throughput is adjusted by OEM system, and adjusting OEM value is 40-80%, keeps Cr target current constant, Ti target current is adjusted to 2-
8A, substrate bias -80V, sedimentation time 60-300min.
10. preparation method according to claim 3, it is characterised in that: in step (7), the parameter of graphite coating sputtering are as follows:
Carbon target size of current 1-6A, substrate bias -80V, sedimentation time 15-25min.
Priority Applications (1)
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| CN110265668A (en) * | 2019-06-19 | 2019-09-20 | 上海大学 | Hydrogen fuel battery metal bi-polar plate and preparation method thereof |
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| CN111384413A (en) * | 2020-04-29 | 2020-07-07 | 上海捷氢科技有限公司 | Fuel cell bipolar plate with metal-graphite composite structure and fuel cell |
| CN113737142A (en) * | 2021-06-23 | 2021-12-03 | 上海大学 | Preparation method of composite gradient carbon-based coating of proton exchange membrane fuel cell titanium bipolar plate |
| CN114774869A (en) * | 2022-04-08 | 2022-07-22 | 西安热工研究院有限公司 | Component-adjustable TixCr1-xNyNano coating, preparation method and application thereof |
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