CN209389136U - A kind of metal double polar plates and fuel cell - Google Patents
A kind of metal double polar plates and fuel cell Download PDFInfo
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- CN209389136U CN209389136U CN201822200083.5U CN201822200083U CN209389136U CN 209389136 U CN209389136 U CN 209389136U CN 201822200083 U CN201822200083 U CN 201822200083U CN 209389136 U CN209389136 U CN 209389136U
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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 utility model is to be related to fuel cell field about a kind of metal double polar plates and fuel cell.The technical solution mainly used are as follows: metal double polar plates include metal substrate and alternate coatings.Alternate coatings deposit on metallic substrates；Alternate coatings include at least two unit coatings being sequentially depositing, and each unit coating includes tie coat and the first conductive coating.The binding force of tie coat and metal substrate is greater than the binding force of the first conductive coating and metal substrate.A unit coating in alternate coatings is first unit coating；Tie coat in first unit coating is contacted with metal substrate.A kind of fuel cell includes above-mentioned metal double polar plates.The utility model is mainly used for improving the corrosion resistance of metal double polar plates, electric conductivity, the binding force for improving coating and metal substrate, extends metal double polar plates service life.
Description
Technical field
The utility model relates to a kind of field of fuel cell technology, more particularly to a kind of metal double polar plates and fuel electricity
Pond.
Background technique
Bipolar plates are one of most critical components of pemfc stack, and cost accounts for 35% or so in the cost of pile.It is bipolar
Plate is mainly used for transmitting electronics, transmitting heat, collecting gas, segmentation monocell etc..Therefore, exploitation has electric-conductivity heat-conductivity high,
The material of the features such as low gas permeability, high mechanical strength, highly corrosion resistant, runner easy to process is current bipolar plates research
Main target.
The bipolar plates (especially stainless steel material) of metal material with its excellent electrical and thermal conductivity, it is easily processed into type,
The features such as at low cost, wins the concern of many scholars.But to generate electric conductivity poor on the surface of the bipolar plates of metal material
Oxide layer, while easily corroding under the working environment of pile.Also, metal erosion generate metal ion after spreading,
Into after membrane electrode, the conductivity of proton exchange membrane can be made to decline, or even can also make catalyst poisoning, to produce to battery performance
Raw very detrimental effect.
Currently, the main preparation methods of metal double polar plates are to deposit painting on metallic substrates using physical vaporous deposition
Layer.Such as, the metal double polar plates of the first prior art are to deposit one layer of metal nitride on the surface of stainless steel substrate.Second
The metal double polar plates of the prior art are deposited amorphous carbon film or graphene film coating on metallic substrates.
But the above-mentioned prior art referred to at least has the following technical problems:
(1) after long-term work, etching problem still compares the metal double polar plates of above-mentioned the first prior art referred to
It is more apparent.
(2) although corrosion resistance can be improved in above-mentioned second of the prior art referred to a certain extent；But it is whole
The binding force of coating and metal substrate is poor, and coating, which is used for a long time, to fall off.
(3) due to the inherent characteristics of physical vapour deposition (PVD), the inside of coating and surface can be made to there is pin hole, corrosive medium
Entered by pin hole and reaches metallic matrix inside film layer, etched the matrix.Although the prior art also proposes reparation to needle pore defect
Scheme, but existing recovery scenario can only close the hole on corrosion-resistant finishes surface, to the envelope of corrosion-resistant finishes internal void
It is limited to close ability.
Utility model content
In view of this, the present invention provides a kind of metal double polar plates and fuel cell, main purpose is to provide one
Kind corrosion resistance is good, coating is not easily to fall off, metal double polar plates with good conductivity.
In order to achieve the above objectives, the utility model mainly provides the following technical solutions:
On the one hand, the embodiments of the present invention provide a kind of metal double polar plates, wherein the metal double polar plates include:
Metal substrate；
Alternate coatings are deposited on the metal substrate；Wherein, the alternate coatings include at least two being sequentially depositing
Unit coating, and each unit coating includes tie coat and the first conductive coating；
Wherein, the binding force of the tie coat and the metal substrate is greater than first conductive coating and the metal
The binding force of substrate；
Wherein, a unit coating in the alternate coatings is first unit coating；In the first unit coating
Tie coat is contacted with the metal substrate.
It the purpose of this utility model and solves its technical problem also following technical measures can be used to further realize.
Preferably, the tie coat is metal nitride coatings, and the metal nitride coatings are TiCrN coating；With/
Or first conductive coating is equadag coating；And/or the tie coat in the first unit coating with a thickness of 20~
200nm；In the alternate coatings, other unit coatings other than the first unit coating are second unit coating；
Wherein, the tie coat in the second unit coating with a thickness of 1~50nm；Preferably, the thickness of first conductive coating
Degree is 1~50nm.
Preferably, the tie coat in the alternate coatings and the first conductive coating alternating deposit；And/or adjacent transition
There is transition portion between coating and the first conductive coating；Wherein, the ingredient of the transition portion includes the tie coat
Ingredient in ingredient and the first conductive coating；Wherein, when the tie coat is TiCrN coating, the first conductive coating is graphite
When coating, the ingredient of the transition portion includes titanium, chromium, nitrogen and carbon.
Preferably, the metal double polar plates further include the second conductive coating；Wherein, second conductive coating is deposited on institute
It states on alternate coatings；Preferably, the ingredient of second conductive coating includes graphite and the first metal；Wherein, it described second leads
Electrocoat has the first pin hole, and first pin hole is blocked by the oxide that first metal is formed.
Preferably, the content of graphite is 60~80% in second conductive coating；Preferably, first metal includes
One or both of titanium and chromium；Preferably, second conductive coating, is calculated in mass percent, including 60~80% stone
Ink, 10~30% titanium, 2~10% chromium；Preferably, second conductive coating with a thickness of 20nm~5 μm.
Preferably, the metal double polar plates further include hydrophobic layer；Wherein, the hydrophobic layer setting is in the described second conductive painting
On layer；It is further preferred that the ingredient of the hydrophobic layer includes PTFE.
On the other hand, the example of the utility model also provides a kind of fuel cell, wherein the fuel cell, which is wrapped to state, appoints
Metal double polar plates described in one；Or the fuel cell includes the fuel that is prepared of preparation method of above-mentioned metal double polar plates
Battery.
Compared with prior art, a kind of metal double polar plates of the utility model and fuel cell at least have following beneficial
Effect:
On the one hand, the binding force of metal substrate and coating plays vital work to metal double polar plates long-time stability
With, and the binding force of metal substrate and graphite type coating is poor；The utility model embodiment is (preferably golden using tie coat
Belong to nitride coatings) bottoming, then it is transitioned into the first conductive coating (preferably equadag coating), it not only can effectively improve whole
The binding force of a coating, it may also be ensured that the electric conductivity of metal double polar plates.On the other hand, since there are pin holes for the coating of deposition
Defect, the pin hole in same coating are easy to through entire coating；The utility model embodiment is applied using the transition of alternating deposit
Layer (preferably metal nitride coatings), the method for the first conductive coating (preferably equadag coating) prevent hydrogen ion from passing through needle to reach
The purpose that hole is permeated to intrinsic silicon improves the corrosion resistance of metal double polar plates.
Further, in order to further increase the electric conductivity of metal double polar plates, the metal double polar plates in the present embodiment are also wrapped
Include the second conductive coating being deposited on alternate coatings.Wherein, the ingredient of the second conductive coating includes graphite and the first metal；Its
In, the content of graphite is 60~80%, further preferably 70~80%.Wherein, the second conductive coating has the first pin hole, the
One pin hole is blocked by the oxide that first metal is formed.Here, the coating due to deposition haves the defects that pin hole, for reality
Existing sealing of hole, improves the corrosion resistance of metal double polar plates, and the present embodiment is by making the ingredient of the second conductive coating include a small amount of the
One metal, so at least partly the first metal can form the first metal oxide under the action of high speed oxonium ion and lead second
Pin hole blocks some or all of in electrocoat, meanwhile, high speed oxonium ion can also be weaker by binding force on the second conductive coating
Part remove, to further increase the corrosion resistance of metal double polar plates.
Further, metal double polar plates provided by the embodiment of the utility model on the second conductive coating by being arranged one layer
Hydrophobic layer improves the hydrophobicity of metal double polar plates, further prevents hydrogen ion from permeating by pin hole to intrinsic silicon, further mentions
The corrosion resistance of high metal bipolar plates.In addition, the hydrophobic performance of PTFE is preferable, and the electric conductivity of metal double polar plates is not influenced.
To sum up, the coating material in metal double polar plates provided by the embodiment of the utility model is common material, by upper
The structure for stating coating in corrosion resistance, electric conductivity, coating and the metal substrate binding force for improving metal double polar plates, thermal conductivity, is dredged
While aqueous, moreover it is possible to reduce the manufacturing cost of metal double polar plates.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and can be implemented in accordance with the contents of the specification, below on the preferred embodiment of the present invention and the accompanying drawings in detail
It describes in detail bright as after.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of metal double polar plates provided by the embodiment of the utility model；
Fig. 2 is a kind of metal double polar plates provided by the embodiment of the utility model after depositing second conductive coating, with oxygen
Structural schematic diagram before ion sputtering sealing of hole moditied processing；
Fig. 3 is a kind of metal double polar plates provided by the embodiment of the utility model after depositing second conductive coating, and uses oxygen
Structural schematic diagram after ion sputtering sealing of hole moditied processing；
Fig. 4 is a kind of structural representation of the alternate coatings of deposition provided by the embodiment of the utility model on metallic substrates
Figure.
Specific embodiment
Further to illustrate that the utility model is the technical means and efficacy reaching predetermined purpose of utility model and being taken,
Below in conjunction with attached drawing and preferred embodiment, to specific embodiment, structure, feature and its function according to the present utility model application
Effect, detailed description is as follows.In the following description, what different " embodiment " or " embodiment " referred to is not necessarily same implementation
Example.In addition, the special characteristic, structure or feature in one or more embodiments can be combined by any suitable form.
Embodiment 1
The present embodiment provides a kind of metal double polar plates, and as shown in Figures 1 to 4, the metal double polar plates in the present embodiment include:
Metal substrate 1 and alternate coatings 2.Wherein, alternate coatings 2 are deposited on metal substrate 1；Alternate coatings 2 include at least two according to
The unit coating 20 of secondary deposition, and each unit coating 20 includes tie coat 201 and the first conductive coating 202.Wherein, transition
The binding force of coating 201 and metal substrate 1 is greater than the binding force of the first conductive coating 202 and metal substrate 1.In alternate coatings 2
A unit coating be first unit coating；Tie coat 201 in first unit coating is contacted with metal substrate 1.
It is applied here, the tie coat 201 in the present embodiment is selected with the stronger metal nitride of the binding force of metal substrate 1
Layer；Certainly coating of metal oxides, metal-carbide coating etc. can also be selected.
On the one hand, the binding force of metal substrate and coating plays vital work to metal double polar plates long-time stability
With, and the binding force of metal substrate and graphite type coating is poor；The present embodiment uses tie coat (preferably, metal nitrogen
Compound coating) bottoming, then be transitioned into the first conductive coating not only and can effectively improve the binding force of entire coating, it can also be really
Protect the electric conductivity of metal double polar plates.On the other hand, since the coating of deposition haves the defects that pin hole, the pin hole in same coating is very
It is easy to run through entire coating；The present embodiment is reached using the metal nitride coatings of alternating deposit, the method for the first conductive coating
To preventing hydrogen ion from passing through the purpose that pin hole is permeated to intrinsic silicon, the corrosion resistance of metal double polar plates is improved.
Preferably, tie coat 201 is TiCrN coating, utility model people discovery: the knot of TiCrN coating and metal substrate
It is excellent with joint efforts.First conductive coating 202 is equadag coating, and electric conductivity, the thermal conductivity of equadag coating are preferable.
Preferably, tie coat 201 in first unit coating with a thickness of 20~200nm；It is applied by the transition of the thickness
Layer 201 can ensure that the binding force of metal substrate 1 and alternate coatings 2.Preferably, in alternate coatings 2, in addition to first unit coating
Except other unit coatings be second unit coating；Wherein, the tie coat in second unit coating with a thickness of 1~
50nm；First conductive coating with a thickness of 1~50nm.
Preferably, 202 alternating deposit of tie coat 201 and the first conductive coating in alternate coatings 2, setting can be more in this way
Further increase the corrosion resistance of alternate coatings.There is transition part between adjacent metal nitride coatings and the first conductive coating
Point；Wherein, the ingredient of transition portion includes the ingredient in the ingredient and the first conductive coating of transition portion.When tie coat is
When TiCrN coating, the first conductive coating are equadag coating, the ingredient of transition portion includes titanium, chromium, nitrogen and carbon.
Preferably, the alternate coatings include 2-5 unit coating.
Embodiment 2
Preferably, the present embodiment provides a kind of metal double polar plates, it is as shown in Figures 1 to 4, double in order to further increase metal
The electric conductivity of pole plate, the metal double polar plates in the present embodiment further include the second conductive coating 3 being deposited on alternate coatings.Second
Conductive coating includes graphite linings；Wherein, the graphite linings have the first pin hole, and first pin hole is formed by first metal
Oxide block.
In the present embodiment, 3 ingredient of the second conductive coating includes graphite and the first metal；Wherein, the content of graphite be 60~
80%, further preferably 70~80%.Wherein, the second conductive coating has the first pin hole, and the first pin hole is by first gold medal
Belong to the oxide 31 formed to block.The presence of graphite can further increase the electric conductivity and corrosion resistance of coating, metal ion
Addition facilitate the modification (that is, oxidation sealing of hole) of the subsequent surface defect to material.
Here, the coating due to deposition haves the defects that pin hole, in order to realize sealing of hole, the corrosion-resistant of metal double polar plates is improved
Property, the present embodiment is by making the ingredient of the second conductive coating include that (oxide of graphite is gas to the first a small amount of metal, can not
Sealing of hole), so at least partly the first metal can go into the first metal oxide will be some or all of in the second conductive coating
Pin hole blocks；The pinhole definitions being closed are the first pin hole.
Preferably, the first metal includes one or both of titanium and chromium.Further preferably, the second conductive coating, with
Mass percentage, the chromium of the titanium of graphite, 10-30% including 60-80%, 2-10%.Second conductive coating of the ingredient
Electric conductivity and corrosion resistance are preferable.It is further preferred that including 70~80% graphite, the titanium of 10-20%, 2-5% chromium.
Preferably, second conductive coating with a thickness of 20nm-5 μm.
Embodiment 3
Preferably, the present embodiment provides a kind of metal double polar plates, and as shown in Figures 1 to 4, compared with above-described embodiment, this
The metal double polar plates of embodiment further include hydrophobic layer 4；Wherein, hydrophobic layer 4 is arranged on the second conductive coating 3；Further preferably
, the ingredient of hydrophobic layer 4 includes PTFE.
Metal double polar plates provided in this embodiment improve metal by the way that one layer of hydrophobic layer is arranged on the second conductive coating 3
The hydrophobicity of bipolar plates further prevents hydrogen ion from permeating by pin hole to intrinsic silicon, further increases metal double polar plates
Corrosion resistance.In addition, the hydrophobic performance of PTFE is preferable, and the electric conductivity of metal double polar plates is not influenced.
Preferably, the material of the metal substrate in above-described embodiment be iron-based stainless steel, titanium, titanium alloy, aluminium, aluminium alloy,
The materials such as nickel.
In addition, the coating material in metal double polar plates provided by the above embodiment is common material, pass through above-mentioned coating
Structure, improving corrosion resistance, electric conductivity, coating and the metal substrate binding force of metal double polar plates, thermal conductivity, hydrophobic
Simultaneously, moreover it is possible to reduce the manufacturing cost of metal double polar plates.
Embodiment 4
Preferably, the present embodiment provides a kind of preparation method of metal double polar plates described in any of the above-described embodiment, such as Fig. 1
To shown in Fig. 4, specifically comprise the following steps:
1, it pre-processes: pretreatment operation being carried out to metal substrate 1, improves the cleannes and surface roughness of metal substrate.
The step specifically includes:
11) first step pre-processes: successively carrying out oil removing, etching, cleaning, drying process to metal substrate.Specifically, to choosing
Fixed metal substrate carries out first time oil removal treatment with the sodium hydroxide solution high temperature (80 DEG C) of 1M；After cleaning up, then use wine
Second of the oil removing of row that progress greatly cleaning.Then, metal substrate 10-60min is etched at 80 DEG C with 5% sulfuric acid or hydrochloric acid solution.
It is cleaned after the completion of etching with pure water, the metal substrate through over cleaning, which is put into pure water, to be saved, and is blown using preceding with clean nitrogen
It sweeps clean.
The step is to increase the specific surface area of metal substrate to improve the cleannes of metal substrate, roughness, to increase
Binding force between strong metal substrate and coating.
12) second step pre-processes: under vacuum conditions, carrying out ion sputtering to metal substrate.
Specifically, using bias magnetic control multi-arc ion coating film device, the fixture equipped with metal substrate is fitted into vacuum chamber,
It is evacuated down to 3 × 10-3Pa~6 × 10-3Pa, preferably 5 × 10-5Metal substrate is heated to 150-300 DEG C, is passed through 0.5- by Pa
1.5Pa, the preferably inert gas of 1Pa (such as argon gas) or nitrogen, bias sets carry out surface ion in -200V~-2500V
Sputtering and etching activation, time control in 3min-45min.
Here, being by the purpose for carrying out ion sputtering pretreatment operation: in order to further remove metallic substrate surfaces
Oxide；Meanwhile can be further improved the roughness of metallic substrate surfaces by ion sputtering and etching activation, table is compared in increase
Area reinforces the binding force between metal substrate and coating.
2, alternate coatings are deposited: depositing alternate coatings 2 on the surface of metal substrate 1.
Wherein, alternate coatings 2 include multiple unit coatings 20 being sequentially depositing, and each unit coating 20 is applied including transition
Layer 201 and the first conductive coating 202；Wherein, a unit coating in alternate coatings 2 is first unit coating；First unit
Tie coat 201 in coating is contacted with metal substrate 1.
Preferably, the step specifically: in a vacuum chamber, it is passed through nitrogen, titanium chromium hybrid target and graphite target are opened in interval,
The surface alternating deposit TiCrN coating and equadag coating of the metal substrate.
Preferably, the step of deposition alternate coatings, carries out in bias magnetic control multi-arc ion coating film device.
Preferably, in this step, plating under membrane stage, maintain vacuum degree 3 × 10-3Pa~5 × 10-3Pa, nitrogen are passed through
Amount is 50~300sccm, and partial pressure maintains 0.5~2Pa, keeps workpiece bias power supply in running order, bias pressure device is-
Between 100~-500V, substrate temperature is controlled between 350~500 DEG C；Sedimentation time is 10~90min.
3, depositing second conductive coating: the depositing second conductive coating 3 on alternate coatings 2.
Preferably, the step of depositing second conductive coating, carries out in bias magnetic control multi-arc ion coating film device.Tool
Body includes:
31, it deposits mixed coating: in a vacuum chamber, being evacuated to 3 × 10-3Pa~6 × 10-3Pa (preferably 5 × 10- 3Pa), the inert gas for being passed through 0.5~1.5Pa (preferably 1Pa), opens simultaneously the first gold medal at the bias for setting -100~-500V
Belong to target and graphite target, continue to be deposited on alternate coatings point mixed coating including graphite and the first metal (mixed coating
Specific ingredient is referring to shown in embodiment 2).Preferably, the first metallic target is titanium chromium hybrid target, and the first metal includes in titanium and chromium
It is one or two kinds of.Preferably, the sedimentation time of mixed coating is 30~60min.
32, it aoxidizes sealing of hole moditied processing: being passed through inert gas and oxygen into vacuum chamber, set bias -100~-500V,
Oxygen is carried out to intensify ionization, so that oxonium ion is bombarded the mixed coating 1-10min, aoxidizes the first a small amount of metal, obtain
By the second conductive coating of the first metal oxide sealing of hole；Wherein, the pressure of the inert gas is 0.5-1Pa, the oxygen
Pressure be 0.1-0.5Pa.
For the step of sinking to the bottom the second conductive coating, it should be understood that the depositing second conductive coating on alternate coatings.
The presence of graphite can further increase the electric conductivity and corrosion resistance of coating, and the addition of metal ion (titanium, chromium ion) helps
In the modification of the subsequent surface defect to material.Second conductive coating is with a thickness of 20nm-5um.Physical vaporous deposition is intrinsic
Defect causes occur pin-hole phenomena in coating, and for the reparation problem of pin hole, the prior art mentions selfreparing and aoxidizes sealing of hole
Processing method.But these sealing of hole measures are primarily directed to external defect, limited to the pin hole sealing of hole effect of coat inside.At this
In embodiment, it is passed through a small amount of oxygen in vacuum chamber, excitation ionization carried out to oxygen, forms high energy particle, bombards coating, one
Aspect can remove the poor part of surface binding force, improve the binding force with the amorphous carbon-film coating of subsequent deposition.Meanwhile it is high
Can oxygen particle can penetrate surface and enter coat inside oxidation sealing of hole carried out to titanium chromium etc., repair defect, and a small amount of oxidation
Coated conductive will not be impacted again.After the completion of anti-corrosion layer preparation, a small amount of oxygen is poured into vacuum chamber, so that
Oxygen intensifies ionization, carries out oxidative modification processing to passivation layer.
4, surface hydrophobicity is handled: hydrophobic layer 4 is arranged on the surface of the second conductive coating 3.
Specifically, the step of surface hydrophobicity is handled, specifically: alternate coatings, second conductive coating will be sequentially depositing
Metal substrate immerses in hydrophobing agent, carries out surface hydrophobicity processing, forms hydrophobic layer on the surface of second conductive coating；To thin
Water layer carries out curing process, after natural cooling, obtains metal double polar plates；
Preferably, it is the PTFE solution of 0.1-5% that the hydrophobing agent, which selects mass fraction,；Further preferably 0.5~2%
PTFE solution.
Preferably, the step of carrying out curing process to hydrophobic layer are as follows: the metal substrate that surface forms hydrophobic layer to be heated to
It 200~450 DEG C (preferably 300~450 DEG C), is heat-treated 30s~10min (preferably 3~5min).Preferably, surface hydrophobicity
The time of processing is 30s~5min；Preferably, the hydrophobic layer with a thickness of 2~20nm.
Further the utility model is carried out below by specific experiment embodiment as described below:
EXPERIMENTAL EXAMPLE 1
The metal substrate of the present embodiment selectes 316L stainless steel.By the metal substrate depositing coating, it is prepared into metal bipolar
It is the step of plate, specific as follows:
1) first time oil removal treatment 30min is carried out to metal substrate at 80 DEG C with the sodium hydroxide solution of 1M, cleaning is dry
After net, secondary oil removing is carried out to metal substrate with alcohol and is cleaned.After the completion of cleaning, then with 5% sulfuric acid solution at 80 DEG C to gold
Belong to base plate carving and corrosion 10min.It is cleaned after the completion of etching with pure water, the metal substrate through over cleaning, which is put into pure water, to be saved；Make
Completely with preceding clean nitrogen purging.
2) bias magnetron arc ion plating film device is used, metal substrate is sent into vacuum chamber, vacuum degree is evacuated to very
Sky 5 × 10-3Pa and the nitrogen for metal substrate being heated to 180 DEG C, being passed through 1Pa or so, setting bias -220V；To metal substrate
Surface ion sputtering, etching activation are carried out, the time controls in 5min.
3) rotate the metal substrate in vacuum chamber, chromium titanium hybrid target and graphite target are opened in interval, in the table of metal substrate
Face alternating deposit TiCrN coating and equadag coating (wherein, with the bottoming of TiCrN coating)；Wherein, alternately superposition deposits two kinds of coatings
A unit coating is formed, the thickness control of signal layer coating is co-deposited 5 unit coatings in 20nm, one.
4) vacuum degree of vacuum chamber is evacuated to 5 × 10-3Pa, be passed through into vacuum chamber 1Pa argon gas, by bias sets-
300V, continue to deposit graphite-titanium-chromium mixed coating, sedimentation time 45min on alternate coatings.
5) 0.8Pa argon gas and 0.2Pa oxygen are passed through into vacuum chamber, by bias sets in -200V, to graphite-titanium-chromium
Mixed coating carries out surface ion sputtering and etching, time 5min.
6) the cated metal substrate of deposition that step 5) obtains is immersed in 0.5% PTFE aqueous solution and carries out surface
Hydrophobic treatment, after, it is drawn off draining away the water, is put into after heating 5min in 400 DEG C of baking ovens, after natural cooling, obtains gold
Belong to bipolar plates.
EXPERIMENTAL EXAMPLE 2
The metal substrate of the present embodiment selectes 316L stainless steel.By the metal substrate depositing coating, it is prepared into metal bipolar
It is the step of plate, specific as follows:
1) first time oil removal treatment 30min is carried out to metal substrate at 80 DEG C with the sodium hydroxide solution of 1M, cleaning is dry
After net, secondary oil removing is carried out to metal substrate with alcohol and is cleaned.After the completion of cleaning, then with 5% sulfuric acid solution at 80 DEG C to gold
Belong to base plate carving and corrosion 10min.It is cleaned after the completion of etching with pure water, the metal substrate through over cleaning, which is put into pure water, to be saved；Make
Completely with preceding clean nitrogen purging.
2) bias magnetron arc ion plating film device is used, metal substrate is sent into vacuum chamber, vacuum degree is evacuated to very
Sky 5 × 10-3Pa and the nitrogen for metal substrate being heated to 150 DEG C, being passed through 1Pa or so, setting bias -200V；To metal substrate
Surface ion sputtering, etching activation are carried out, the time controls in 5min.
3) rotate the metal substrate in vacuum chamber, chromium titanium hybrid target and graphite target are opened in interval, in the table of metal substrate
Face alternating deposit TiCrN coating and equadag coating (wherein, with the bottoming of TiCrN coating)；Wherein, alternately superposition deposits two kinds of coatings
A unit coating is formed, the thickness control of signal layer coating is co-deposited 2 unit coatings in 20nm, one.
4) vacuum degree of vacuum chamber is evacuated to 5 × 10-3Pa, be passed through into vacuum chamber 1Pa argon gas, by bias sets-
350V, continue to deposit graphite-titanium-chromium mixed coating, sedimentation time 25min on alternate coatings.
5) 0.8Pa argon gas and 0.2Pa oxygen are passed through into vacuum chamber, by bias sets in -200V, to graphite-titanium-chromium
Mixed coating carries out surface ion sputtering and etching, time 5min.
6) the cated metal substrate of deposition that step 5) obtains is immersed in 0.5% PTFE aqueous solution and carries out surface
Hydrophobic treatment, after, it is drawn off draining away the water, is put into after heating 5min in 400 DEG C of baking ovens, after natural cooling, obtains gold
Belong to bipolar plates.
EXPERIMENTAL EXAMPLE 3
The metal substrate of the present embodiment selectes 316L stainless steel.By the metal substrate depositing coating, it is prepared into metal bipolar
It is the step of plate, specific as follows:
1) first time oil removal treatment 30min is carried out to metal substrate at 80 DEG C with the sodium hydroxide solution of 1M, cleaning is dry
After net, secondary oil removing is carried out to metal substrate with alcohol and is cleaned.After the completion of cleaning, then with 5% sulfuric acid solution at 80 DEG C to gold
Belong to base plate carving and corrosion 10min.It is cleaned after the completion of etching with pure water, the metal substrate through over cleaning, which is put into pure water, to be saved；Make
Completely with preceding clean nitrogen purging.
2) bias magnetron arc ion plating film device is used, metal substrate is sent into vacuum chamber, vacuum degree is evacuated to very
Sky 5 × 10-3Pa and the nitrogen for metal substrate being heated to 220 DEG C, being passed through 1Pa or so, setting bias -400V；To metal substrate
Surface ion sputtering, etching activation are carried out, the time controls in 5min.
3) rotate the metal substrate in vacuum chamber, chromium titanium hybrid target and graphite target are opened in interval, in the table of metal substrate
Face alternating deposit TiCrN coating and equadag coating (wherein, with the bottoming of TiCrN coating)；Wherein, alternately superposition deposits two kinds of coatings
A unit coating is formed, the thickness control of signal layer coating is co-deposited 3 unit coatings in 20nm, one.
4) vacuum degree of vacuum chamber is evacuated to 5 × 10-3Pa, be passed through into vacuum chamber 1Pa argon gas, by bias sets-
300V, continue to deposit graphite-titanium-chromium mixed coating, sedimentation time 45min on alternate coatings.
5) 0.7Pa argon gas and 0.3Pa oxygen are passed through into vacuum chamber, by bias sets in -230V, to graphite-titanium-chromium
Mixed coating carries out surface ion sputtering and etching, time 5min.
6) the cated metal substrate of deposition that step 5) obtains is immersed in 0.5% PTFE aqueous solution and carries out surface
Hydrophobic treatment, after, it is drawn off draining away the water, is put into after heating 5min in 400 DEG C of baking ovens, after natural cooling, obtains gold
Belong to bipolar plates.
EXPERIMENTAL EXAMPLE 4
The metal substrate of the present embodiment selectes 316L stainless steel.By the metal substrate depositing coating, it is prepared into metal bipolar
It is the step of plate, specific as follows:
1) first time oil removal treatment 30min is carried out to metal substrate at 80 DEG C with the sodium hydroxide solution of 1M, cleaning is dry
After net, secondary oil removing is carried out to metal substrate with alcohol and is cleaned.After the completion of cleaning, then with 5% sulfuric acid solution at 80 DEG C to gold
Belong to base plate carving and corrosion 10min.It is cleaned after the completion of etching with pure water, the metal substrate through over cleaning, which is put into pure water, to be saved；Make
Completely with preceding clean nitrogen purging.
2) bias magnetron arc ion plating film device is used, metal substrate is sent into vacuum chamber, vacuum degree is evacuated to very
Sky 5 × 10-3Pa and the nitrogen for metal substrate being heated to 220 DEG C, being passed through 1Pa or so, setting bias -1200V；To Metal Substrate
Plate carries out surface ion sputtering, etching activation, and the time controls in 5min.
3) rotate the metal substrate in vacuum chamber, chromium titanium hybrid target and graphite target are opened in interval, in the table of metal substrate
Face alternating deposit TiCrN coating and equadag coating (wherein, with the bottoming of TiCrN coating)；Wherein, alternately superposition deposits two kinds of coatings
A unit coating is formed, the thickness control of signal layer coating is co-deposited 5 unit coatings in 20nm, one.
4) vacuum degree of vacuum chamber is evacuated to 5 × 10-3Pa, be passed through into vacuum chamber 1Pa argon gas, by bias sets-
300V, continue to deposit graphite-titanium-chromium mixed coating, sedimentation time 35min on alternate coatings.
5) 0.8Pa argon gas and 0.2Pa oxygen are passed through into vacuum chamber, by bias sets in -200V, to graphite-titanium-chromium
Mixed coating carries out surface ion sputtering and etching, time 5min.
6) the cated metal substrate of deposition that step 5) obtains is immersed in 0.3% PTFE aqueous solution and carries out surface
Hydrophobic treatment, after, it is drawn off draining away the water, is put into after heating 5min in 430 DEG C of baking ovens, after natural cooling, obtains gold
Belong to bipolar plates.
EXPERIMENTAL EXAMPLE 5
The metal substrate of the present embodiment selectes 316L stainless steel.By the metal substrate depositing coating, it is prepared into metal bipolar
It is the step of plate, specific as follows:
1) first time oil removal treatment 30min is carried out to metal substrate at 80 DEG C with the sodium hydroxide solution of 1M, cleaning is dry
After net, secondary oil removing is carried out to metal substrate with alcohol and is cleaned.After the completion of cleaning, then with 5% sulfuric acid solution at 80 DEG C to gold
Belong to base plate carving and corrosion 10min.It is cleaned after the completion of etching with pure water, the metal substrate through over cleaning, which is put into pure water, to be saved；Make
Completely with preceding clean nitrogen purging.
2) bias magnetron arc ion plating film device is used, metal substrate is sent into vacuum chamber, vacuum degree is evacuated to very
Sky 5 × 10-3Pa and the nitrogen for metal substrate being heated to 220 DEG C, being passed through 1Pa or so, setting bias -1200V；To Metal Substrate
Plate carries out surface ion sputtering, etching activation, and the time controls in 5min.
3) rotate the metal substrate in vacuum chamber, chromium titanium hybrid target and graphite target are opened in interval, in the table of metal substrate
Face alternating deposit TiCrN coating and equadag coating (wherein, with the bottoming of TiCrN coating)；Wherein, alternately superposition deposits two kinds of coatings
A unit coating is formed, the thickness control of signal layer coating is co-deposited 5 unit coatings in 20nm, one.
EXPERIMENTAL EXAMPLE 6
The metal substrate of the present embodiment selectes 316L stainless steel.By the metal substrate depositing coating, it is prepared into metal bipolar
It is the step of plate, specific as follows:
1) first time oil removal treatment 30min is carried out to metal substrate at 80 DEG C with the sodium hydroxide solution of 1M, cleaning is dry
After net, secondary oil removing is carried out to metal substrate with alcohol and is cleaned.After the completion of cleaning, then with 5% sulfuric acid solution at 80 DEG C to gold
Belong to base plate carving and corrosion 10min.It is cleaned after the completion of etching with pure water, the metal substrate through over cleaning, which is put into pure water, to be saved；Make
Completely with preceding clean nitrogen purging.
2) bias magnetron arc ion plating film device is used, metal substrate is sent into vacuum chamber, vacuum degree is evacuated to very
Sky 5 × 10-3Pa and the nitrogen for metal substrate being heated to 220 DEG C, being passed through 1Pa or so, setting bias -1200V；To Metal Substrate
Plate carries out surface ion sputtering, etching activation, and the time controls in 5min.
3) rotate the metal substrate in vacuum chamber, chromium titanium hybrid target and graphite target are opened in interval, in the table of metal substrate
Face alternating deposit TiCrN coating and equadag coating (wherein, with the bottoming of TiCrN coating)；Wherein, alternately superposition deposits two kinds of coatings
A unit coating is formed, the thickness control of signal layer coating is co-deposited 5 unit coatings in 20nm, one.
4) vacuum degree of vacuum chamber is evacuated to 5 × 10-3Pa, be passed through into vacuum chamber 1Pa argon gas, by bias sets-
300V, continue to deposit graphite-titanium-chromium mixed coating, sedimentation time 35min on alternate coatings.
EXPERIMENTAL EXAMPLE 7
The metal substrate of the present embodiment selectes 316L stainless steel.By the metal substrate depositing coating, it is prepared into metal bipolar
It is the step of plate, specific as follows:
1) first time oil removal treatment 30min is carried out to metal substrate at 80 DEG C with the sodium hydroxide solution of 1M, cleaning is dry
After net, secondary oil removing is carried out to metal substrate with alcohol and is cleaned.After the completion of cleaning, then with 5% sulfuric acid solution at 80 DEG C to gold
Belong to base plate carving and corrosion 10min.It is cleaned after the completion of etching with pure water, the metal substrate through over cleaning, which is put into pure water, to be saved；Make
Completely with preceding clean nitrogen purging.
2) bias magnetron arc ion plating film device is used, metal substrate is sent into vacuum chamber, vacuum degree is evacuated to very
Sky 5 × 10-3Pa and the nitrogen for metal substrate being heated to 220 DEG C, being passed through 1Pa or so, setting bias -1200V；To Metal Substrate
Plate carries out surface ion sputtering, etching activation, and the time controls in 5min.
3) rotate the metal substrate in vacuum chamber, chromium titanium hybrid target and graphite target are opened in interval, in the table of metal substrate
Face alternating deposit TiCrN coating and equadag coating (wherein, with the bottoming of TiCrN coating)；Wherein, alternately superposition deposits two kinds of coatings
A unit coating is formed, the thickness control of signal layer coating is co-deposited 5 unit coatings in 20nm, one.
4) vacuum degree of vacuum chamber is evacuated to 5 × 10-3Pa, be passed through into vacuum chamber 1Pa argon gas, by bias sets-
300V, continue to deposit graphite-titanium-chromium mixed coating, sedimentation time 35min on alternate coatings.
5) 0.8Pa argon gas and 0.2Pa oxygen are passed through into vacuum chamber, by bias sets in -200V, to graphite-titanium-chromium
Mixed coating carries out surface ion sputtering and etching, time 5min.
Comparative example 1
The metal substrate of comparative example 1 selectes 316L stainless steel.By the metal substrate depositing coating, it is prepared into metal double polar plates
The step of, it is specific as follows:
1) first time oil removal treatment 30min is carried out to metal substrate at 80 DEG C with the sodium hydroxide solution of 1M, cleaning is dry
After net, secondary oil removing is carried out to metal substrate with alcohol and is cleaned.After the completion of cleaning, then with 5% sulfuric acid solution at 80 DEG C to gold
Belong to base plate carving and corrosion 10min.It is cleaned after the completion of etching with pure water, the metal substrate through over cleaning, which is put into pure water, to be saved；Make
Completely with preceding clean nitrogen purging.
2) bias magnetron arc ion plating film device is used, metal substrate is sent into vacuum chamber, vacuum degree is evacuated to very
Sky 5 × 10-3Pa and the nitrogen for metal substrate being heated to 220 DEG C, being passed through 1Pa or so, setting bias -1200V；To Metal Substrate
Plate carries out surface ion sputtering, etching activation, and the time controls in 5min.
3) vacuum degree of vacuum chamber is evacuated to 5 × 10-3Pa, be passed through into vacuum chamber 1Pa argon gas, by bias sets-
300V, one layer of CrN tie coat, sedimentation time 45min are deposited on metallic substrates.
4) be passed through into vacuum chamber 1Pa argon gas, by bias sets -300V, on tie coat deposit one layer of graphite
Coating, sedimentation time 45min.
The metal double polar plates prepared to EXPERIMENTAL EXAMPLE 1-7 and comparative example 1 are tested for the property, test result such as 1 institute of table
Show.
The performance test results for the metal double polar plates that table 1 is EXPERIMENTAL EXAMPLE 1-7 and prepared by comparative example 1
From the experimental result in table 1 it can be seen that
The utility model embodiment by depositing alternate coatings on metallic substrates, and alternate coatings include being sequentially depositing
Multilevel-cell coating, each unit coating includes metal nitride coatings and equadag coating, wherein being beaten with metal nitride coatings
Bottom.Compared with comparative example 1, above-mentioned setting significantly enhances the binding force of entire coating, it may also be ensured that metal double polar plates
Electric conductivity, and improve the corrosion resistance of metal double polar plates.
Further, the utility model embodiment is further obvious by the depositing second conductive coating on alternate coatings
Ground improves the electric conductivity of metal double polar plates.Also, by carrying out oxidative modification to the second conductive coating, further improve gold
Belong to the corrosion resistance of bipolar plates.
Further, the utility model embodiment is by further improving to hydrophobic layer is arranged on the second conductive coating
Corrosion resistance.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation, any simple modification, equivalent change and modification made by the above technical examples according to the technical essence of the present invention,
It is still within the scope of the technical solutions of the present invention.
Claims (10)
1. a kind of metal double polar plates, which is characterized in that the metal double polar plates include:
Metal substrate；
Alternate coatings are deposited on the metal substrate；Wherein, the alternate coatings include at least two units being sequentially depositing
Coating, and each unit coating includes tie coat and the first conductive coating；
Wherein, the binding force of the tie coat and the metal substrate is greater than first conductive coating and the metal substrate
Binding force；
Wherein, a unit coating in the alternate coatings is first unit coating；Transition in the first unit coating
Coating is contacted with the metal substrate.
2. metal double polar plates according to claim 1, which is characterized in that the tie coat is metal nitride coatings.
3. metal double polar plates according to claim 2, which is characterized in that the metal nitride coatings are TiCrN coating.
4. metal double polar plates according to claim 1, which is characterized in that
First conductive coating is equadag coating；And/or
Tie coat in the first unit coating with a thickness of 20~200nm；In the alternate coatings, in addition to described
Other unit coatings except one unit coating are second unit coating；Wherein, the tie coat in the second unit coating
With a thickness of 1~50nm；And/or
First conductive coating with a thickness of 1~50nm.
5. metal double polar plates according to claim 1-4, which is characterized in that the transition in the alternate coatings applies
Layer and the first conductive coating alternating deposit；And/or
There is transition portion between adjacent tie coat and the first conductive coating；Wherein, the ingredient of the transition portion includes
Ingredient in the ingredient of tie coat and the first conductive coating；
Wherein, when the tie coat is TiCrN coating, the first conductive coating is equadag coating, the transition portion at
Divide includes titanium, chromium, nitrogen and carbon.
6. metal double polar plates according to claim 1-4, which is characterized in that the metal double polar plates further include
Two conductive coatings；Wherein, second conductive coating is deposited on the alternate coatings.
7. metal double polar plates according to claim 6, which is characterized in that the ingredient of second conductive coating includes graphite
With the first metal；Wherein, second conductive coating has the first pin hole, and first pin hole is formed by first metal
Oxide blocks.
8. metal double polar plates according to claim 7, which is characterized in that
First metal includes one or both of titanium and chromium；And/or
Second conductive coating with a thickness of 20nm~5 μm.
9. metal double polar plates according to claim 6, which is characterized in that the metal double polar plates further include hydrophobic layer；Its
In, the hydrophobic layer is arranged on second conductive coating；
Wherein, the ingredient of the hydrophobic layer includes PTFE.
10. a kind of fuel cell, which is characterized in that the fuel cell includes that the described in any item metals of claim 1-9 are double
Pole plate.
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| CN201822200083.5U CN209389136U (en) | 2018-12-26 | 2018-12-26 | A kind of metal double polar plates and fuel cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560289A (en) * | 2018-12-26 | 2019-04-02 | 浙江锋源氢能科技有限公司 | A kind of metal double polar plates and preparation method thereof and fuel cell |
| CN113680590A (en) * | 2021-08-12 | 2021-11-23 | 上海交通大学 | Device and method for preparing electrically-assisted gradient coating of fuel cell polar plate substrate |
-
2018
- 2018-12-26 CN CN201822200083.5U patent/CN209389136U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560289A (en) * | 2018-12-26 | 2019-04-02 | 浙江锋源氢能科技有限公司 | A kind of metal double polar plates and preparation method thereof and fuel cell |
| CN109560289B (en) * | 2018-12-26 | 2023-11-28 | 浙江锋源氢能科技有限公司 | Metal bipolar plate, preparation method thereof and fuel cell |
| CN113680590A (en) * | 2021-08-12 | 2021-11-23 | 上海交通大学 | Device and method for preparing electrically-assisted gradient coating of fuel cell polar plate substrate |
| CN113680590B (en) * | 2021-08-12 | 2022-06-24 | 上海交通大学 | Device and method for preparing electrically-assisted gradient coating of fuel cell polar plate substrate |
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