CN108300989A - A kind of stainless steel high temperature chemically blackening agent and a kind of blackening method of stainless steel - Google Patents
A kind of stainless steel high temperature chemically blackening agent and a kind of blackening method of stainless steel Download PDFInfo
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- CN108300989A CN108300989A CN201710596043.4A CN201710596043A CN108300989A CN 108300989 A CN108300989 A CN 108300989A CN 201710596043 A CN201710596043 A CN 201710596043A CN 108300989 A CN108300989 A CN 108300989A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
- C23C22/62—Treatment of iron or alloys based thereon
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Abstract
The invention belongs to technical field of surface, and in particular to a kind of stainless steel surface environment-friendly type blackening agent for surface is made of nitrate, phosphate, complexing agent and water.The present invention also provides a kind of blackening methods of stainless steel, include the following steps：Nitrate, phosphate, complexing agent are mixed with water, pH is adjusted to alkalinity, obtains blackening agent for surface；Stainless steel surface is pre-processed, then is placed in the blackening agent for surface and is aoxidized, the stainless steel after being blacked.The blackening agent for surface of the present invention is free of hexavalent chromium, and asepsis environment-protecting is pollution-free；Without corrosive substances such as strong acid, highly basic, reaction is mild, to human body without any harmful effect in operating process；The formula and blackening range of blackening agent for surface are wide, and technique is easy to implement, reproducible.
Description
Technical field
The present invention relates to technical field of surface more particularly to a kind of stainless steel high temperature chemically blackening agent and one kind are stainless
The blackening method of steel.
Background technology
Stainless steel has excellent corrosion resistance and plastic deformation ability, in kitchen utensils, household electrical appliance, instrument instrument
It is used widely in the fields such as table, medical instrument, electronics industry, building decoration, chemical industry equipment, sign printing and military project.With
The diversified and advanced of stainless steel application, the single silvery white of stainless steel itself cannot meet the need of various product
It asks, stainless steel surface coloring becomes important one of the surface treatment of stainless steel.Wherein, stainless steel, which black not only, has centainly
Dicoration also has excellent extinction and heat absorptivity, is with a wide range of applications in above-mentioned field.
Stainless steel blackening includes room temperature blackening technique and high temperature blackening.The advantages of room temperature blackening technique is energy consumption
Low, the disadvantage is that Stability of Bath Solution is poor, adjustment, control are difficult；Consistency, the poor adhesive force of film；Film layer wearability is sent out not as good as high temperature
Black film etc..The advantages of high temperature blackening is that Stability of Bath Solution is good, is easy to control；It is film layer color evenness, film adhesion, resistance to
It is significantly better than that room temperature blackening technique in terms of corrosion, wearability.It is still high temperature blackening that industrially application is more at present, but
The blackening agent for surface that existing stainless steel high temperature blackening uses is mainly based on the bichromates such as chromic anhydride or potassium bichromate, sodium dichromate
Ingredient is wanted, toxic Cr is contained6+, environmental pollution is serious.
Invention content
Present invention solves the technical problem that being to provide a kind of blackening agent for surface, blackening agent for surface provided by the present application is sent out for stainless steel
In black, so as to get film layer have preferable adhesive force, corrosion resistance and wearability；Blackening agent for surface has the feature of environmental protection simultaneously.
In view of this, this application provides a kind of stainless steel high temperature chemically blackening agent, by nitrate, phosphate, complexing agent
It is formed with water.
Preferably, the nitrate is one or more in sodium nitrate, potassium nitrate and calcium nitrate；The phosphate choosing
From one or both of diammonium hydrogen phosphate and ammonium dihydrogen phosphate；The complexing agent is selected from edetate.
Preferably, the content of the nitrate is 0.1~2.0mol/L, and the phosphatic content is 0.1~1.0mol/
The content of L, the complexing agent are 0.1~2.0mol/L.
Preferably, the content of the nitrate is 0.8~1.6mol/L, and the phosphatic content is 0.4~0.8mol/
The content of L, the complexing agent are 0.8~1.6mol/L.
Preferably, the molar ratio of the nitrate, phosphate and complexing agent is 2：1：2.
Present invention also provides a kind of blackening methods of stainless steel surface, include the following steps：
Nitrate, phosphate, complexing agent are mixed with water, pH is adjusted to alkalinity, obtains blackening agent for surface；
Stainless steel surface is pre-processed, then is placed in the blackening agent for surface and is aoxidized, the stainless steel after being blacked.
Preferably, the reagent for adjusting pH is ammonium hydroxide, and the pH value of the blackening agent for surface is 10~12.
Preferably, the temperature of the oxidation is 100~180 DEG C, and the time of the oxidation is 5~30min.
This application provides a kind of stainless steel blackening agent for surface comprising nitrate, phosphate, complexing agent and water.The application carries
Not including hexavalent chromium in the blackening agent for surface of confession, asepsis environment-protecting is pollution-free, and nitrate is used as oxidant during blacking,
It reacts to obtain oxide with elements such as chromium, iron under heating condition, to obtain black oxide film, phosphate is mainly to stainless
Steel surface is activated, and complexing agent by the way that the metal ion of dissolving is complexed, controls reaction speed, finally make preparation in the solution
Stainless steel film adhesion, corrosion resistance and wearability are preferable.
Description of the drawings
Fig. 1 is the photomacrograph of stainless steel nigrescence sample prepared by the embodiment of the present invention 5；
Fig. 2 is the SEM photograph of stainless steel nigrescence specimen surface prepared by the embodiment of the present invention 5；
Fig. 3 is the ingredient energy spectrum analysis of stainless steel nigrescence specimen surface prepared by the embodiment of the present invention 5.
Specific implementation mode
For a further understanding of the present invention, the preferred embodiment of the invention is described with reference to embodiment, still
It should be appreciated that these descriptions are only the feature and advantage further illustrated the present invention, rather than to the claims in the present invention
Limitation.
For in prior art stainless steel high temperature blackening, contain toxic Cr6+, to the danger of environment and operating personnel
Evil, this application provides a kind of stainless steel high temperature chemically blackening agent, are made of nitrate, phosphate, complexing agent and water.
In this application, the stainless steel high temperature chemically blackening agent is soluble in water by nitrate, phosphate and complexing agent
It obtains.
In a particular embodiment, the nitrate is one or more in sodium nitrate, potassium nitrate and calcium nitrate；More
Body, the nitrate is selected from sodium nitrate, potassium nitrate or calcium nitrate.Content of the nitrate in the blackening agent for surface is 0.1
~2.0mol/L, in certain specific embodiments, the content of the nitrate is 0.8~1.6mol/L.Herein described nitric acid
Salt plays oxidant during blacking, and generates their oxide with element reactions such as chromium, iron in a heated condition, from
And obtain black oxide film；Its too high levels is then also easy to produce hydroxide precipitation, colouring speeds is made to slow down in solution.
In a particular embodiment, the phosphate is selected from one or both of diammonium hydrogen phosphate and ammonium dihydrogen phosphate, more
Specifically, the phosphate is selected from diammonium hydrogen phosphate or ammonium dihydrogen phosphate.Content of the phosphate in the blackening agent for surface be
0.1~1.0mol/L, in certain specific embodiments, the content of the blackening agent for surface is 0.4~0.8mol/L.Herein described phosphorus
Hydrochlorate mainly activates stainless steel surface, promotes surface coloring；Phosphate content is relatively low, and activation effect is poor, colouring speeds
Slowly；Content is higher, and a small amount of phosphide is had in coloring process and is attached to stainless steel surface, is conducive to increase black film adhesive force and resistance to
Corrosive nature；Content is higher, then stainless steel surface attachment phosphide, which increases, makes black film color burnt hair, influences the degree of blackness of film；
In addition, phosphate may also function as the effect of buffer, make the pH stable of solution between 10~12, melanism film quality is most at this time
It is good.
In a particular embodiment, the complexing agent is selected from edetate.The content of the complexing agent be 0.1~
2.0mol/L, in certain specific embodiments, the content of the complexing agent is 0.8~1.6mol/L.Complexing agent leads in the solution
The metal ion of complexing dissolving is crossed, reaction speed is controlled；The complexing agent content is too low, then be not complexed metal in solution from
Son makes solution deteriorate, and film forming speed slows down；Too high levels, then film forming speed is fast, keeps film layer thinning, wear-resisting property is made to reduce.
In a particular embodiment, the molar ratio of the nitrate, phosphate and complexing agent is 2:1:2.
Using above-mentioned stainless steel high temperature chemically blackening agent, present invention also provides a kind of blackening method of stainless steel surface,
Include the following steps：
Nitrate, phosphate and complexing agent are mixed in water, pH is adjusted to alkalinity, obtains blackening agent for surface；
Stainless steel surface is pre-processed, then is placed in the blackening agent for surface and is aoxidized after heating, it is stainless after being blacked
Steel.
In the blackening method of above-mentioned stainless steel surface, the application is configured with blackening agent for surface first, i.e., by nitrate, phosphate
It is mixed in water with complexing agent, adjusts pH to alkalinity, obtain blackening agent for surface.During above-mentioned configuration blackening agent for surface, the nitre of use
Hydrochlorate, phosphate and complexing agent is above-mentioned has been carried out detailed description, are no longer repeated herein.In order to make raw material be uniformly mixed,
The configuration of the blackening agent for surface is specially：
Nitrate and complexing agent are dissolved in deionized water, phosphate is dissolved in deionized water, by obtained above two
Kind solution mixing, adjusts pH to 10~12 using ammonium hydroxide, obtains blackening agent for surface.
In a particular embodiment, the nitrate, phosphate and complexing agent are common agents in the prior art, to it
Source the application is without particularly limiting.
After the application pre-processes stainless steel surface, then places it in above-mentioned blackening agent for surface and aoxidized, after obtaining nigrescence
Stainless steel.The pretreatment is mode well known to those skilled in the art, is not particularly limited to this application, described pre-
Processing is for removing removing rust greasy dirt.In a particular embodiment, the temperature of the oxidation is 100~180 DEG C, the time of the oxidation
For 5~30min；In a particular embodiment, the temperature of the oxidation is 120~180 DEG C, time of the oxidation is 10~
30min。
Cr VI is free of in the blackening agent for surface of the present invention, entire nigrescence process not can cause environmental pollution；Without strong acid, by force
The corrosive substances such as alkali, reaction is mild, to human body without any harmful effect in operating process.Since the blackening method of the application is
Chemical method and solution alkaline, it is of less demanding to sample pre-treatment, letter is carried out using method known in those skilled in the art
After single degreasing and rust removal processing, satisfied black film can be obtained.
Chromic acid method poor reproducibility, aberration is apparent, and the time that blacks is difficult to control, and nigrescence time lengthening is easy to happen black degeneration
Phenomenon.The formula and blackening range of blackening agent for surface of the present invention are wide, and technique is easy to implement, reproducible；Stainless steel work-piece is in " hair
It is black " time for staying of liquid is long again, and it will not occur to fade, scared or excessive erosion, remain to keep bright and clean black film.The surface black film
Film color is pitch-black, uniform color, and glossiness is good, and corrosion resistance, wearability, film layer and basal body binding force are met or exceeded
Existing black-emitting technology is horizontal.
For a further understanding of the present invention, blackening agent for surface provided by the invention and blackening method are carried out with reference to embodiment
It is described in detail, protection scope of the present invention is not limited by the following examples.
Embodiment 1
1) configuration of blackening agent for surface
0.4mol calcium nitrate, 0.4mol disodium ethylene diamine tetraacetates, 0.2mol diammonium hydrogen phosphates are measured respectively；By measurement
Calcium nitrate and disodium ethylene diamine tetraacetate are dissolved in 500ml deionized waters, and are stirred until being completely dissolved；By the phosphoric acid hydrogen of measurement
Diammonium is dissolved in other 500ml deionized waters, and is stirred until being completely dissolved；The two is mixed, it is 10 to adjust pH value with ammonium hydroxide
To get to the blackening agent for surface of the present embodiment between~12；
2) blackening method
After stainless steel work-piece is removed removing rust greasy dirt using conventional method, it is placed in the good blackening agent for surface of above-mentioned configuration and carries out oxygen
Change and black, the temperature of oxidizing blackening is 180 DEG C, and the oxidizing blackening time is 30min, and stainless steel work-piece is washed and dried up after taking-up
Stainless steel work-piece after being blacked afterwards.
3) performance study
The sample after nigrescence is subjected to neutral salt spray corrosion resistance experiment, 800h film layer color and lusters by GB/T 10125-2012
Without significant change, the highest standard of stainless steel black film is 600~800h of salt spray test at present；It is carried out by GB/T 1768-2006
Wearability is tested, and rubber wheel pressurization 500g, grinding wheel speed 1000r/min, rub 20min, and Film color shows without significant change
Black film wear-resisting property is excellent；Film layer is good with basal body binding force, and nigrescence sample bending 180 degree repeatedly, skin covering of the surface is not damaged, no stripping
It falls.
Embodiment 2
1) configuration of blackening agent for surface
0.6mol potassium nitrate, 0.6mol disodium ethylene diamine tetraacetates, 0.3mol diammonium hydrogen phosphates are measured respectively；By measurement
Potassium nitrate and disodium ethylene diamine tetraacetate are dissolved in 500ml deionized waters, and are stirred until being completely dissolved；By the phosphoric acid hydrogen of measurement
Diammonium is dissolved in other 500ml deionized waters, and is stirred until being completely dissolved；The two is mixed, it is 10 to adjust pH value with ammonium hydroxide
To get to the blackening agent for surface of the present embodiment between~12；
2) blackening method
After stainless steel work-piece is removed removing rust greasy dirt using conventional method, it is placed in the good blackening agent for surface of above-mentioned configuration and carries out oxygen
Change and black, the temperature of oxidizing blackening is 180 DEG C, and the oxidizing blackening time is 20min, and stainless steel work-piece is washed and dried up after taking-up
Stainless steel work-piece after being blacked afterwards.
3) performance study
The sample after nigrescence is subjected to neutral salt spray corrosion resistance experiment, 800h film layer color and lusters by GB/T 10125-2012
Without significant change, the highest standard of stainless steel black film is 600~800h of salt spray test at present；It is carried out by GB/T 1768-2006
Wearability is tested, and rubber wheel pressurization 500g, grinding wheel speed 1000r/min, rub 20min, and Film color shows without significant change
Black film wear-resisting property is excellent；Film layer is good with basal body binding force, and nigrescence sample bending 180 degree repeatedly, skin covering of the surface is not damaged, no stripping
It falls.
Embodiment 3
1) configuration of blackening agent for surface
0.8mol sodium nitrate, 0.8mol disodium ethylene diamine tetraacetates, 0.4mol diammonium hydrogen phosphates are measured respectively；By measurement
Sodium nitrate and disodium ethylene diamine tetraacetate are dissolved in 500ml deionized waters, and are stirred until being completely dissolved；By the phosphoric acid hydrogen of measurement
Diammonium is dissolved in other 500ml deionized waters, and is stirred until being completely dissolved；The two is mixed, it is 10 to adjust pH value with ammonium hydroxide
To get to the blackening agent for surface of the present embodiment between~12；
2) blackening method
After stainless steel work-piece is removed removing rust greasy dirt using conventional method, it is placed in the good blackening agent for surface of above-mentioned configuration and carries out oxygen
Change and black, the temperature of oxidizing blackening is 180 DEG C, and the oxidizing blackening time is 10min, and stainless steel work-piece is washed and dried up after taking-up
Stainless steel work-piece after being blacked afterwards.
3) performance study
The sample after nigrescence is subjected to neutral salt spray corrosion resistance experiment, 800h film layer color and lusters by GB/T 10125-2012
Without significant change, the highest standard of stainless steel black film is 600~800h of salt spray test at present；It is carried out by GB/T 1768-2006
Wearability is tested, and rubber wheel pressurization 500g, grinding wheel speed 1000r/min, rub 20min, and Film color shows without significant change
Black film wear-resisting property is excellent；Film layer is good with basal body binding force, and nigrescence sample bending 180 degree repeatedly, skin covering of the surface is not damaged, no stripping
It falls.
Embodiment 4
1) configuration of blackening agent for surface
1.0mol potassium nitrate, 1.0mol disodium ethylene diamine tetraacetates, 0.5mol ammonium dihydrogen phosphates are measured respectively；By measurement
Potassium nitrate and disodium ethylene diamine tetraacetate are dissolved in 500ml deionized waters, and are stirred until being completely dissolved；By the di(2-ethylhexyl)phosphate of measurement
Hydrogen ammonium is dissolved in other 500ml deionized waters, and is stirred until being completely dissolved；The two is mixed, it is 10 to adjust pH value with ammonium hydroxide
To get to the blackening agent for surface of the present embodiment between~12；
2) blackening method
After stainless steel work-piece is removed removing rust greasy dirt using conventional method, it is placed in the good blackening agent for surface of above-mentioned configuration and carries out oxygen
Change and black, the temperature of oxidizing blackening is 150 DEG C, and the oxidizing blackening time is 10min, and stainless steel work-piece is washed and dried up after taking-up
Stainless steel work-piece after being blacked afterwards.
3) performance study
The sample after nigrescence is subjected to neutral salt spray corrosion resistance experiment, 800h film layer color and lusters by GB/T 10125-2012
Without significant change；The highest standard of stainless steel black film is 600~800h of salt spray test at present；It is carried out by GB/T 1768-2006
Wearability is tested, and rubber wheel pressurization 500g, grinding wheel speed 1000r/min, rub 20min, and Film color shows without significant change
Black film wear-resisting property is excellent；Film layer is good with basal body binding force, and nigrescence sample bending 180 degree repeatedly, skin covering of the surface is not damaged, no stripping
It falls.
Embodiment 5
1) configuration of blackening agent for surface
1.2mol sodium nitrate, 1.2mol disodium ethylene diamine tetraacetates, 0.6mol ammonium dihydrogen phosphates are measured respectively；By measurement
Sodium nitrate and disodium ethylene diamine tetraacetate are dissolved in 500ml deionized waters, and are stirred until being completely dissolved；By the di(2-ethylhexyl)phosphate of measurement
Hydrogen ammonium is dissolved in other 500ml deionized waters, and is stirred until being completely dissolved；The two is mixed, it is 10 to adjust pH value with ammonium hydroxide
To get to the blackening agent for surface of the present embodiment between~12；
2) blackening method
After stainless steel work-piece is removed removing rust greasy dirt using conventional method, it is placed in the good blackening agent for surface of above-mentioned configuration and carries out oxygen
Change and black, the temperature of oxidizing blackening is 120 DEG C, and the oxidizing blackening time is 10min, and stainless steel work-piece is washed and dried up after taking-up
Stainless steel work-piece after being blacked afterwards.
3) performance study
The sample after nigrescence is subjected to neutral salt spray corrosion resistance experiment, 800h film layer color and lusters by GB/T 10125-2012
Without significant change；The highest standard of stainless steel black film is salt spray test 600-800h at present；It is carried out by GB/T 1768-2006
Wearability is tested, and rubber wheel pressurization 500g, grinding wheel speed 1000r/min, rub 20min, and Film color shows without significant change
Black film wear-resisting property is excellent；Film layer is good with basal body binding force, and nigrescence sample bending 180 degree repeatedly, skin covering of the surface is not damaged, no stripping
It falls.
The blackening feature of the blackening agent for surface is：With the raising of hair blackening liquid concentration, Solution Active increases, oxidizing blackening temperature
It can reduce, the time that blacks can shorten.As shown in FIG. 1, FIG. 1 is the macroscopic view photographs of stainless steel nigrescence sample prepared by embodiment 5
Piece, according to the photomacrograph of Fig. 1 it is found that the Film color of stainless steel nigrescence specimen surface is pitch-black, uniform color, glossiness is good,
With extremely strong dicoration.Fig. 2 is the SEM photograph of stainless steel nigrescence specimen surface prepared by embodiment 5, as shown in Figure 2, film layer
For fine and close block structure, surface is moist；Fig. 3 is the surface composition power spectrum of stainless steel nigrescence sample prepared by embodiment 5
Analysis, from the figure 3, it may be seen that surface black film mainly includes about 52.1% O, the Fe (at.%) of 31.3% Cr and 13.9%, explanation
Skin covering of the surface is mainly made of chromium oxide and iron oxide.
The explanation of above example is only intended to facilitate the understanding of the method and its core concept of the invention.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvement and modification are also fallen within the protection scope of the claims of the present invention.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (8)
1. a kind of stainless steel high temperature chemically blackening agent, is made of nitrate, phosphate, complexing agent and water.
2. stainless steel high temperature chemically blackening agent according to claim 1, which is characterized in that the nitrate is selected from nitric acid
It is one or more in sodium, potassium nitrate and calcium nitrate；The one kind of the phosphate in diammonium hydrogen phosphate and ammonium dihydrogen phosphate
Or two kinds；The complexing agent is selected from edetate.
3. stainless steel high temperature chemically blackening agent according to claim 1, which is characterized in that the content of the nitrate is
0.1~2.0mol/L, the phosphatic content are 0.1~1.0mol/L, and the content of the complexing agent is 0.1~2.0mol/
L。
4. stainless steel high temperature chemically blackening agent according to claim 1, which is characterized in that the content of the nitrate is
0.8~1.6mol/L, the phosphatic content are 0.4~0.8mol/L, and the content of the complexing agent is 0.8~1.6mol/
L。
5. stainless steel high temperature chemically blackening agent according to claim 1, which is characterized in that the nitrate, phosphate with
The molar ratio of complexing agent is 2：1：2.
6. a kind of blackening method of stainless steel surface, includes the following steps：
Nitrate, phosphate, complexing agent are mixed with water, pH is adjusted to alkalinity, obtains blackening agent for surface；
Stainless steel surface is pre-processed, then is placed in the blackening agent for surface and is aoxidized, the stainless steel after being blacked.
7. blackening method according to claim 6, which is characterized in that the reagent for adjusting pH is ammonium hydroxide, the nigrescence
The pH value of agent is 10~12.
8. blackening method according to claim 6, which is characterized in that the temperature of the oxidation is 100~180 DEG C, described
The time of oxidation is 5~30min.
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| CN201710596043.4A CN108300989A (en) | 2017-07-20 | 2017-07-20 | A kind of stainless steel high temperature chemically blackening agent and a kind of blackening method of stainless steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112071946A (en) * | 2019-05-21 | 2020-12-11 | 北京铂阳顶荣光伏科技有限公司 | Preparation method of thin-film solar cell |
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| CN101200799A (en) * | 2006-12-15 | 2008-06-18 | 西安工业大学 | Medium-low temperature high corrosion resistant black phosphating solution on steel surface |
| CN104233275A (en) * | 2014-09-23 | 2014-12-24 | 中山市华光化工有限公司 | High-temperature blackening agent suitable for stainless steel or alloy steel and using method of high-temperature blackening agent |
| CN106868493A (en) * | 2016-12-26 | 2017-06-20 | 安徽宝恒新材料科技有限公司 | A kind of stainless steel surfaces extinction blackening method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1393305A (en) * | 2001-06-29 | 2003-01-29 | 宣碧华 | Method for manufacturing chain |
| CN101200799A (en) * | 2006-12-15 | 2008-06-18 | 西安工业大学 | Medium-low temperature high corrosion resistant black phosphating solution on steel surface |
| CN104233275A (en) * | 2014-09-23 | 2014-12-24 | 中山市华光化工有限公司 | High-temperature blackening agent suitable for stainless steel or alloy steel and using method of high-temperature blackening agent |
| CN106868493A (en) * | 2016-12-26 | 2017-06-20 | 安徽宝恒新材料科技有限公司 | A kind of stainless steel surfaces extinction blackening method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112071946A (en) * | 2019-05-21 | 2020-12-11 | 北京铂阳顶荣光伏科技有限公司 | Preparation method of thin-film solar cell |
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