CN107236945A - A kind of preparation method of stainless steel surfaces phosphating coat - Google Patents
A kind of preparation method of stainless steel surfaces phosphating coat Download PDFInfo
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- CN107236945A CN107236945A CN201710697022.1A CN201710697022A CN107236945A CN 107236945 A CN107236945 A CN 107236945A CN 201710697022 A CN201710697022 A CN 201710697022A CN 107236945 A CN107236945 A CN 107236945A
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- stainless steel
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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
- C23C22/06—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 aqueous acidic solutions with pH less than 6
- C23C22/34—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 aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
- C23C22/36—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 aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates
-
- 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
- C23C22/73—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 characterised by the process
-
- 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
- C23C22/78—Pretreatment of the material to be coated
Abstract
The invention discloses a kind of preparation method of stainless steel surfaces phosphating coat, it is related to stainless steel part technical field, including：(1) workpiece surface ionization is handled；(2) workpiece activation process；(3) phosphating solution is prepared；(4) phosphorating treatment；(5) phosphatization is post-processed；The phosphating coat formed by the inventive method in stainless steel surfaces, not only with good film forming speed, meanwhile, with preferable phosphatization film thickness and corrosion resistance, it can preferably improve the decay resistance of stainless steel.
Description
Technical field
The invention belongs to stainless steel part technical field, and in particular to a kind of preparation method of stainless steel surfaces phosphating coat.
Background technology
Phosphating coat has many excellent properties, available for protecting, be electrically insulated, wear-resisting, cold forming etc., it may also be used for process
Between protection and paint and powder etc. organic film bottom, often there is phosphatization speed and subtracts in the traditional phosphating solutions process of stainless steel
Slowly, the problems such as phosphatization membrane crystallization thick not even phosphatization.To solve the above problems, patent CN102146578A provides a kind of electricity
The mode accelerated improves phosphating process, and this method accelerates phosphating coat deposition using extra electric field, makes phosphating coat crystal grain thin
Small densification, corrosion resistance is improved.The A of patent CN 105603413 provide a kind of preparation side of surface of low-alloy steel phosphating coat
Method, this method first carries out making Nano surface using to workpiece, then carries out phosphorating treatment, although can improve phosphatization to a certain degree
The performance of film, still, phosphating coat can be greatly reduced with the adhesion of matrix, meanwhile, the hardness of phosphating coat is not good.These sides
Method promotes the phosphatization of steel alloy from phosphating formula or technique is changed mostly, seldom accelerates from metal base surface property is changed
Parkerizing process, therefore can not fundamentally solve unfavorable shadow of the uneven microstructure to parkerizing process of low-alloy steel internal structure
Ring.
The content of the invention
The purpose of the present invention is that there is provided a kind of preparation method of stainless steel surfaces phosphating coat the problem of being directed to existing.
The present invention is achieved by the following technical solutions：
A kind of preparation method of stainless steel surfaces phosphating coat, comprises the following steps：
(1) workpiece surface ionization is handled：By stainless steel work-piece after oil removing, surface is used after deionized water cleaning, drying, is put
Enter in vacuum metal container, low pressure hydrogen sulfide is filled with canister, using stainless steel work-piece as negative electrode, using canister as sun
Pole, adds 350-400V DC voltages between negative electrode and anode, handles 45-50s, then stops, and takes out stainless steel work-piece；
(2) workpiece activation process：The stainless steel work-piece handled through step (1) is placed in immersion treatment 30-40min in activating solution,
Then take out, surface uses washes of absolute alcohol 2-3min, 5-8min is then cleaned using deionized water again, then dried；Institute
Activating solution is stated to be made up of following component by weight：Chitosan 1-3, acetic acid 2-4, silane coupler 2.5-2.8, deionized water
90-100；
(3) phosphating solution is prepared：The phosphating solution is made up of following component by weight：Phosphoric acid 2.5-2.8, sodium phosphate 0.5-
1.0th, nitric acid 0.4-0.6, alanine 0.1-0.5, potassium fluoride 0.1-0.3, nano silicon 1-3, deionized water 80-90；
(4) phosphorating treatment：The stainless steel work-piece that will be handled through step (2), which is immersed in the phosphating solution configured in step (3), to be carried out
Phosphorating treatment is to form phosphating coat；
(5) phosphatization is post-processed：Stainless steel work-piece is through soaked in absolute ethyl alcohol 10min after phosphatization, after then being cleaned using deionized water,
Dry to constant weight, you can.
Further：Step (1) the mesolow hydrogen sulfide, low pressure is 50-60KPa.
Further：Immersion treatment in activating solution in the step (2), soaking temperature is 80-90 DEG C.
Further：Activation liquid and preparation method thereof is in the step (3)：Acetic acid is evenly spread in deionized water, plus
Then heat is added after chitosan, stirring and dissolving to 40 DEG C, then adds silane coupler, is continued after stirring and dissolving, is incubated 10min,
.
Further：Nano silicon granularity is 80-90nm in the step (3).
Further：The step.
Further：The step（4）Middle phosphorating treatment is specially：By the phosphating solution temperature adjustment of preparation to 3-5 DEG C of guarantor
Stainless steel work-piece, is then put into phosphating solution by warm 15min, shakes 2min, then quickly heats up to 55-60 DEG C, is incubated 5min, so
After take out, you can.
Further：The step（5）Middle drying is to constant weight, and drying temperature is 121 DEG C.
The present invention has advantages below compared with prior art：Stainless steel widely should because being obtained with excellent corrosion resistance
With, but there is the defect of some destruction phosphatization film uniformities, such as field trash, Pin Lu areas, crystal boundary, dislocation in stainless steel surfaces length
Deng more weak in these local phosphating coats, some active anions such as chlorion, cyanide ion etc. easily go out entrance from defect
Stainless steel surfaces, destroy its phosphating coat, especially chlorion destruction and protrude the most, this present invention passes through in stainless steel work
Part surface carries out ionization processing and activation process respectively, and the defect of stainless steel surfaces can be eliminated to a certain extent, meanwhile, energy
Enough so that phosphating coat grows more uniform, reduction weak defects incidence in stainless steel surfaces, meanwhile, activate stainless steel surfaces
Particle structure, enables to, when carrying out phosphatization, significantly improve the speed of phosphatization and the thickness of phosphating coat, can preferably improve
Adhesion between phosphating coat and stainless steel base, by adding alanine and nano silicon in phosphating solution, can make
Obtaining phosphating coat turns into a kind of amorphous stratiform phosphating coat, without crystal boundary, with good self-repairing capability, meanwhile, possess
More preferable anti-chlorine ion corrosion performance.
Embodiment
Embodiment 1
A kind of preparation method of stainless steel surfaces phosphating coat, comprises the following steps：
(1) workpiece surface ionization is handled：By stainless steel work-piece after oil removing, surface is used after deionized water cleaning, drying, is put
Enter in vacuum metal container, low pressure hydrogen sulfide is filled with canister, using stainless steel work-piece as negative electrode, using canister as sun
Pole, adds 350V DC voltages between negative electrode and anode, handles 45s, then stops, and takes out stainless steel work-piece；
(2) workpiece activation process：The stainless steel work-piece handled through step (1) is placed in immersion treatment 30min in activating solution, then
Take out, surface uses washes of absolute alcohol 2min, 5min is then cleaned using deionized water again, then dried；The activating solution
It is made up by weight of following component：Chitosan 1, acetic acid 2, silane coupler 2.5, deionized water 90；
(3) phosphating solution is prepared：The phosphating solution is made up of following component by weight：Phosphoric acid 2.5, sodium phosphate 0.5, nitric acid
0.4th, alanine 0.1, potassium fluoride 0.1, nano silicon 1, deionized water 80；
(4) phosphorating treatment：The stainless steel work-piece that will be handled through step (2), which is immersed in the phosphating solution configured in step (3), to be carried out
Phosphorating treatment is to form phosphating coat；
(5) phosphatization is post-processed：Stainless steel work-piece is through soaked in absolute ethyl alcohol 10min after phosphatization, after then being cleaned using deionized water,
Dry to constant weight, you can.
Further：Step (1) the mesolow hydrogen sulfide, low pressure is 50KPa.
Further：Immersion treatment in activating solution in the step (2), soaking temperature is 80 DEG C.
Further：Activation liquid and preparation method thereof is in the step (3)：Acetic acid is evenly spread in deionized water, plus
Then heat is added after chitosan, stirring and dissolving to 40 DEG C, then adds silane coupler, is continued after stirring and dissolving, is incubated 10min,
.
Further：Nano silicon granularity is 80nm in the step (3).
Further：The step.
Further：The step（4）Middle phosphorating treatment is specially：By the phosphating solution temperature adjustment of preparation to 3 DEG C of insulations
Stainless steel work-piece, is then put into phosphating solution by 15min, shakes 2min, then quickly heat up to 55 DEG C, insulation 5min, Ran Houqu
Go out, you can.
Further：The step（5）Middle drying is to constant weight, and drying temperature is 121 DEG C.
Embodiment 2
A kind of preparation method of stainless steel surfaces phosphating coat, comprises the following steps：
(1) workpiece surface ionization is handled：By stainless steel work-piece after oil removing, surface is used after deionized water cleaning, drying, is put
Enter in vacuum metal container, low pressure hydrogen sulfide is filled with canister, using stainless steel work-piece as negative electrode, using canister as sun
Pole, adds 400V DC voltages between negative electrode and anode, handles 50s, then stops, and takes out stainless steel work-piece；
(2) workpiece activation process：The stainless steel work-piece handled through step (1) is placed in immersion treatment 40min in activating solution, then
Take out, surface uses washes of absolute alcohol 3min, 8min is then cleaned using deionized water again, then dried；The activating solution
It is made up by weight of following component：Chitosan 3, acetic acid 4, silane coupler 2.8, deionized water 100；
(3) phosphating solution is prepared：The phosphating solution is made up of following component by weight：Phosphoric acid 2.8, sodium phosphate 1.0, nitric acid
0.6th, alanine 0.5, potassium fluoride 0.3, nano silicon 3, deionized water 90；
(4) phosphorating treatment：The stainless steel work-piece that will be handled through step (2), which is immersed in the phosphating solution configured in step (3), to be carried out
Phosphorating treatment is to form phosphating coat；
(5) phosphatization is post-processed：Stainless steel work-piece is through soaked in absolute ethyl alcohol 10min after phosphatization, after then being cleaned using deionized water,
Dry to constant weight, you can.
Further：Step (1) the mesolow hydrogen sulfide, low pressure is 60KPa.
Further：Immersion treatment in activating solution in the step (2), soaking temperature is 90 DEG C.
Further：Activation liquid and preparation method thereof is in the step (3)：Acetic acid is evenly spread in deionized water, plus
Then heat is added after chitosan, stirring and dissolving to 40 DEG C, then adds silane coupler, is continued after stirring and dissolving, is incubated 10min,
.
Further：Nano silicon granularity is 90nm in the step (3).
Further：The step.
Further：The step（4）Middle phosphorating treatment is specially：By the phosphating solution temperature adjustment of preparation to 5 DEG C of insulations
Stainless steel work-piece, is then put into phosphating solution by 15min, shakes 2min, then quickly heat up to 60 DEG C, insulation 5min, Ran Houqu
Go out, you can.
Further：The step（5）Middle drying is to constant weight, and drying temperature is 121 DEG C.
Embodiment 3
A kind of preparation method of stainless steel surfaces phosphating coat, comprises the following steps：
(1) workpiece surface ionization is handled：By stainless steel work-piece after oil removing, surface is used after deionized water cleaning, drying, is put
Enter in vacuum metal container, low pressure hydrogen sulfide is filled with canister, using stainless steel work-piece as negative electrode, using canister as sun
Pole, adds 380V DC voltages between negative electrode and anode, handles 46s, then stops, and takes out stainless steel work-piece；
(2) workpiece activation process：The stainless steel work-piece handled through step (1) is placed in immersion treatment 35min in activating solution, then
Take out, surface uses washes of absolute alcohol 1.5min, 6min is then cleaned using deionized water again, then dried；The activation
Liquid is made up of following component by weight：Chitosan 2, acetic acid 2-4, silane coupler 2.5-2.8, deionized water 90-100；
(3) phosphating solution is prepared：The phosphating solution is made up of following component by weight：Phosphoric acid 2.5-2.8, sodium phosphate 0.8, nitre
Acid 0.5, alanine 0.2, potassium fluoride 0.2, nano silicon 2, deionized water 85；
(4) phosphorating treatment：The stainless steel work-piece that will be handled through step (2), which is immersed in the phosphating solution configured in step (3), to be carried out
Phosphorating treatment is to form phosphating coat；
(5) phosphatization is post-processed：Stainless steel work-piece is through soaked in absolute ethyl alcohol 10min after phosphatization, after then being cleaned using deionized water,
Dry to constant weight, you can.
Further：Step (1) the mesolow hydrogen sulfide, low pressure is 55KPa.
Further：Immersion treatment in activating solution in the step (2), soaking temperature is 85 DEG C.
Further：Activation liquid and preparation method thereof is in the step (3)：Acetic acid is evenly spread in deionized water, plus
Then heat is added after chitosan, stirring and dissolving to 40 DEG C, then adds silane coupler, is continued after stirring and dissolving, is incubated 10min,
.
Further：Nano silicon granularity is 85nm in the step (3).
Further：The step.
Further：The step（4）Middle phosphorating treatment is specially：By the phosphating solution temperature adjustment of preparation to 4 DEG C of insulations
Stainless steel work-piece, is then put into phosphating solution by 15min, shakes 2min, then quickly heat up to 56 DEG C, insulation 5min, Ran Houqu
Go out, you can.
Further：The step（5）Middle drying is to constant weight, and drying temperature is 121 DEG C.
Comparative example 1：Differed only in embodiment 1 without step（1）Processing.
Comparative example 2：Differed only in embodiment 1 without step（2）Processing.
Comparative example 3：Differed only in embodiment 1 in phosphating solution without alanine and nano silicon.
Experiment
Using 301 stainless steel materials as sample, 6 groups are randomly divided into, embodiment is respectively adopted and is handled with comparative example method, is contrasted
The phosphatization film properties of each group formation：
Corrosion resistance：By 1:The saturated nacl aqueous solution equivalent of 2 hydrochloric acid is added drop-wise to specimen surface, evaluates resistance to cream time length
Corrosivity；
Phosphatization speed：Increased weight and weighed with unit interval unit plane integrated membrane；
Table 1
| Film thickness μm | Film increases weight（mg/cm²·h） | Corrosion resistance/min | |
| Embodiment 1 | 35.8 | 1.436 | 12.5 |
| Embodiment 2 | 35.2 | 1.428 | 12.2 |
| Embodiment 3 | 35.4 | 1.433 | 12.4 |
| Comparative example 1 | 26.7 | 1.267 | 12.3 |
| Comparative example 2 | 29.3 | 1.328 | 12.4 |
| Comparative example 3 | 33.6 | 1.359 | 10.8 |
As can be seen from Table 1, processing method of the present invention can be in the more preferable phosphating coat of stainless steel work-piece surface forming properties.
Claims (8)
1. a kind of preparation method of stainless steel surfaces phosphating coat, it is characterised in that comprise the following steps：
(1) workpiece surface ionization is handled：By stainless steel work-piece after oil removing, surface is used after deionized water cleaning, drying, is put
Enter in vacuum metal container, low pressure hydrogen sulfide is filled with canister, using stainless steel work-piece as negative electrode, using canister as sun
Pole, adds 350-400V DC voltages between negative electrode and anode, handles 45-50s, then stops, and takes out stainless steel work-piece；
(2) workpiece activation process：The stainless steel work-piece handled through step (1) is placed in immersion treatment 30-40min in activating solution,
Then take out, surface uses washes of absolute alcohol 2-3min, 5-8min is then cleaned using deionized water again, then dried；Institute
Activating solution is stated to be made up of following component by weight：Chitosan 1-3, acetic acid 2-4, silane coupler 2.5-2.8, deionized water
90-100；
(3) phosphating solution is prepared：The phosphating solution is made up of following component by weight：Phosphoric acid 2.5-2.8, sodium phosphate 0.5-
1.0th, nitric acid 0.4-0.6, alanine 0.1-0.5, potassium fluoride 0.1-0.3, nano silicon 1-3, deionized water 80-90；
(4) phosphorating treatment：The stainless steel work-piece that will be handled through step (2), which is immersed in the phosphating solution configured in step (3), to be carried out
Phosphorating treatment is to form phosphating coat；
(5) phosphatization is post-processed：Stainless steel work-piece is through soaked in absolute ethyl alcohol 10min after phosphatization, after then being cleaned using deionized water,
Dry to constant weight, you can.
2. the preparation method of stainless steel surfaces phosphating coat according to claim 1, it is characterised in that：In the step (1)
Low pressure hydrogen sulfide, low pressure is 50-60KPa.
3. the preparation method of stainless steel surfaces phosphating coat according to claim 1, it is characterised in that：In the step (2)
Immersion treatment in activating solution, soaking temperature is 80-90 DEG C.
4. the preparation method of stainless steel surfaces phosphating coat according to claim 1, it is characterised in that：In the step (3)
Activating liquid and preparation method thereof is：Acetic acid is evenly spread in deionized water, 40 DEG C are heated to, chitosan is then added, stirred molten
Xie Hou, then silane coupler is added, continue after stirring and dissolving, be incubated 10min, you can.
5. the preparation method of stainless steel surfaces phosphating coat according to claim 1, it is characterised in that：In the step (3)
Nano silicon granularity is 80-90nm.
6. the preparation method of stainless steel surfaces phosphating coat according to claim 1, it is characterised in that：The step.
7. the preparation method of stainless steel surfaces phosphating coat according to claim 1, it is characterised in that：The step（3）In
Phosphorating treatment is specially：By the phosphating solution temperature adjustment of preparation to 3-5 DEG C of insulation 15min, stainless steel work-piece is then put into phosphorus
Change in liquid, shake 2min, then quickly heat up to 55-60 DEG C, be incubated 5min, then take out, you can.
8. the preparation method of stainless steel surfaces phosphating coat according to claim 1, it is characterised in that：The step（5）In
Drying is to constant weight, and drying temperature is 121 DEG C.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107805799A (en) * | 2017-11-05 | 2018-03-16 | 包红珠 | A kind of surface treatment method of automatic excess pressure valve |
| CN108220938A (en) * | 2018-01-17 | 2018-06-29 | 安徽工业大学 | A kind of low slag phosphating solution of ultra-thin membranous type room temperature and its synthetic method |
| CN109280910A (en) * | 2018-10-10 | 2019-01-29 | 安徽腾龙泵阀制造有限公司 | A kind of chemical pump surface granosealing technique |
| CN111139483A (en) * | 2020-01-21 | 2020-05-12 | 陕西师范大学 | Preparation method of molybdate waterproof corrosion inhibition film |
| CN111304650A (en) * | 2018-12-11 | 2020-06-19 | 中内凯思汽车新动力系统有限公司 | Piston and piston surface treatment process |
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| CN101115867A (en) * | 2005-02-02 | 2008-01-30 | 日本帕卡濑精株式会社 | Aqueous surface treating agent for metal material, surface treating method and surface-treated metal material |
| CN102367573A (en) * | 2011-10-19 | 2012-03-07 | 中航力源液压股份有限公司 | Precise composite phosphating tank solution and phosphating technology thereof |
| CN105551956A (en) * | 2015-12-29 | 2016-05-04 | 中国电子科技集团公司第五十五研究所 | Chemical palladium plating method for back through hole metallization seed layer of semiconductor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101115867A (en) * | 2005-02-02 | 2008-01-30 | 日本帕卡濑精株式会社 | Aqueous surface treating agent for metal material, surface treating method and surface-treated metal material |
| CN102367573A (en) * | 2011-10-19 | 2012-03-07 | 中航力源液压股份有限公司 | Precise composite phosphating tank solution and phosphating technology thereof |
| CN105551956A (en) * | 2015-12-29 | 2016-05-04 | 中国电子科技集团公司第五十五研究所 | Chemical palladium plating method for back through hole metallization seed layer of semiconductor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107805799A (en) * | 2017-11-05 | 2018-03-16 | 包红珠 | A kind of surface treatment method of automatic excess pressure valve |
| CN108220938A (en) * | 2018-01-17 | 2018-06-29 | 安徽工业大学 | A kind of low slag phosphating solution of ultra-thin membranous type room temperature and its synthetic method |
| CN109280910A (en) * | 2018-10-10 | 2019-01-29 | 安徽腾龙泵阀制造有限公司 | A kind of chemical pump surface granosealing technique |
| CN111304650A (en) * | 2018-12-11 | 2020-06-19 | 中内凯思汽车新动力系统有限公司 | Piston and piston surface treatment process |
| CN111139483A (en) * | 2020-01-21 | 2020-05-12 | 陕西师范大学 | Preparation method of molybdate waterproof corrosion inhibition film |
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Application publication date: 20171010 |