CN114453225A - Dacromet coating method for anti-loose fastener - Google Patents
Dacromet coating method for anti-loose fastener Download PDFInfo
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- CN114453225A CN114453225A CN202111556943.9A CN202111556943A CN114453225A CN 114453225 A CN114453225 A CN 114453225A CN 202111556943 A CN202111556943 A CN 202111556943A CN 114453225 A CN114453225 A CN 114453225A
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- coating
- fastener
- dacromet
- loose
- loose fastener
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- 238000000576 coating method Methods 0.000 title claims abstract description 71
- 239000011248 coating agent Substances 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000005238 degreasing Methods 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 18
- 238000005422 blasting Methods 0.000 claims abstract description 16
- 238000003618 dip coating Methods 0.000 claims abstract description 11
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000007127 saponification reaction Methods 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 7
- 238000004381 surface treatment Methods 0.000 claims abstract description 5
- MFXMOUUKFMDYLM-UHFFFAOYSA-L zinc;dihydrogen phosphate Chemical compound [Zn+2].OP(O)([O-])=O.OP(O)([O-])=O MFXMOUUKFMDYLM-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 30
- 239000011247 coating layer Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000007598 dipping method Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 239000011527 polyurethane coating Substances 0.000 claims description 3
- 229920002050 silicone resin Polymers 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 1
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/586—No clear coat specified each layer being cured, at least partially, separately
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/51—One specific pretreatment, e.g. phosphatation, chromatation, in combination with one specific coating
-
- 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
- C23C22/07—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 phosphates
- C23C22/08—Orthophosphates
- C23C22/12—Orthophosphates containing zinc cations
- C23C22/13—Orthophosphates containing zinc cations containing also nitrate or nitrite anions
-
- 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 belongs to the technical field of surface coating, and discloses a Dacromet coating method for an anti-loose fastener, which is technically characterized by comprising the following steps of: step one, pretreatment: sequentially carrying out degreasing, oil removal, shot blasting and rust removal and cleaning treatment on the anti-loose fastener to be treated; step two, phosphating treatment: placing the pretreated anti-loose fastener into phosphating solution at the temperature of 70-80 ℃ for phosphating surface treatment for 8-10 min, wherein the phosphating solution contains 40-50 g/L zinc dihydrogen phosphate and 25-30 g/L zinc nitrate; step three, cleaning and saponification treatment: and washing the phosphated anti-loose fastener for 2-3 min by using flowing cleaning. The scheme adopts a multistage anticorrosion technology of 'intermediate-temperature phosphating treatment, twice Dacromet dip-coating and high-hardness coating recoating', so that the obtained coating has the advantages of strong adhesive force, high hardness, wear resistance and corrosion resistance, and the process is simple to operate, easy to control and adjust, good in social benefit and economic benefit and worthy of further popularization.
Description
Technical Field
The invention relates to the technical field of surface coating, in particular to a Dacromet coating method for a locking fastener.
Background
The dacromet is also called a zinc-aluminum coating, is a novel anticorrosive coating taking zinc powder, aluminum powder, chromic acid and deionized water as main components, is a surface coating technology with simple process and good anticorrosive effect, is a novel surface treatment technology, and is green electroplating compared with the traditional electroplating process.
While the Dacromet treatment process has many advantages, it has some disadvantages, among which, the disadvantages in application are mainly represented by low surface hardness, poor wear resistance and poor adhesion to metal surfaces, and easy substrate exposure or peeling off from the substrate, so we have proposed Dacromet coating method for anti-loose fasteners to solve the problems.
Disclosure of Invention
In view of the problems in the prior art, the present invention aims to provide a Dacromet coating method for a loose-proof fastener, so as to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme.
A method of dacromet coating a loose-resistant fastener comprising the steps of:
step one, pretreatment: sequentially carrying out degreasing, shot blasting and rust removal and cleaning treatment on the anti-loose fastener to be treated;
step two, phosphating treatment: placing the pretreated anti-loose fastener into phosphating solution at the temperature of 70-80 ℃ for phosphating surface treatment for 8-10 min, wherein the phosphating solution contains 40-50 g/L zinc dihydrogen phosphate and 25-30 g/L zinc nitrate;
step three, cleaning and saponification treatment: washing the phosphated anti-loose fastener for 2-3 min by using flowing cleaning, then placing the anti-loose fastener in sodium stearate with the temperature of 85-95 ℃ and the concentration of 10g/L for saponification for 5-10 min, and drying for later use;
step four, dipping-throwing coating Dacromet coating liquid twice and curing: dipping the anti-loose fastener processed in the third step into Dacromet coating liquid, sequentially carrying out the procedures of centrifugal drying, preheating, baking and curing and air cooling to finish primary dipping of the Dacromet coating liquid and curing, and repeating the processes to finish secondary dipping of the Dacromet coating liquid and curing;
step five, recoating: and coating a high-hardness coating layer on the surface of the fastener after finishing the secondary dip coating of the Dacromet coating liquid and curing, wherein the high-hardness coating is one of epoxy acrylic resin coating, modified silicone resin coating or polyurethane coating.
As a further description of the above technical solution: the pretreatment in the first step comprises the following specific steps:
firstly, alkali washing degreasing and oil removing: degreasing the anti-loosening fastener by using degreasing fluid, wherein the degreasing temperature is 60-80 ℃, and the degreasing time is 5-8 min;
secondly, shot blasting and rust removing: placing the anti-loose fastener in a shot blasting machine for shot blasting for 5-8 min;
thirdly, cleaning: placing the anti-loose fastener subjected to shot blasting treatment into 95% ethanol with the volume fraction of 4-5 times of the mass of the anti-loose fastener, and ultrasonically cleaning for 15-20 min under the conditions that the ultrasonic frequency is 25-35 KHz and the power density is 0.40-0.50 w/cm 2;
fourthly, drying: and (3) carrying out vacuum drying on the cleaned anti-loose fastener for 25-30 min under the conditions of vacuum gauge pressure of-0.09-0.10 MPa and temperature of 60-70 ℃.
As a further description of the above technical solution: the degreasing solution contains 10-15 g/L NaOH and 20-25 g/L Na2CO350-60 g/L of Na2PO45 to 7g/L of Na2SiO3。
As a further description of the above technical solution: step two, the Dacromet coating liquid has the viscosity of 40 +/-2 s and the density of 1.35-1.40 g/cm3A pH of 4.5 to 5.2, Cr6+The content is more than or equal to 23g/L, and the coating liquid temperature is 20 +/-2 ℃.
As a further description of the above technical solution: and secondly, soaking the anti-loose fastener in the Dacromet coating liquid for 30s, and carrying out centrifugal drying at a rotating speed of 240-280 r/min.
As a further description of the above technical solution: in the preheating procedure, the temperature is controlled to be 80-10 ℃ and the time is 10-15 min; in the baking and curing process, the temperature is controlled to be 280-310 ℃ and the time is 15-20 min.
As a further description of the above technical solution: the thickness of the primary Dacromet coating layer obtained by the primary dip-coating Dacromet coating liquid and the curing in the step four is controlled to be 15-30 mu m, and the thickness of the secondary Dacromet coating layer obtained by the secondary dip-coating Dacromet coating liquid and the curing is controlled to be 30-60 mu m.
As a further description of the above technical solution: the thickness of the high-hardness coating layer in the recoating step is 20-60 mu m.
Compared with the prior art, the invention has the advantages that:
the scheme adopts a multistage anticorrosion technology of 'intermediate-temperature phosphating treatment, twice Dacromet dip-coating and high-hardness coating recoating', so that the obtained coating has the advantages of strong adhesive force, high hardness, wear resistance and corrosion resistance, and the process is simple to operate, easy to control and adjust, good in social benefit and economic benefit and worthy of further popularization.
Detailed Description
The technical scheme in the embodiment of the invention will be clearly and completely described below in combination with the embodiment of the invention;
a method of dacromet coating a loose-resistant fastener comprising the steps of:
step one, pretreatment: sequentially carrying out degreasing, shot blasting and rust removal and cleaning treatment on the anti-loose fastener to be treated;
step two, phosphating treatment: placing the pretreated anti-loose fastener into phosphating solution at the temperature of 70-80 ℃ for phosphating surface treatment for 8-10 min, wherein the phosphating solution contains 40-50 g/L zinc dihydrogen phosphate and 25-30 g/L zinc nitrate;
step three, cleaning and saponification treatment: washing the phosphated anti-loose fastener for 2-3 min by using flowing cleaning, then placing the anti-loose fastener in sodium stearate with the temperature of 85-95 ℃ and the concentration of 10g/L for saponification for 5-10 min, and drying for later use;
step four, dipping-throwing coating Dacromet coating liquid twice and curing: dipping the anti-loose fastener processed in the third step into Dacromet coating liquid, sequentially carrying out the procedures of centrifugal drying, preheating, baking and curing and air cooling to finish primary dipping of the Dacromet coating liquid and curing, and repeating the processes to finish secondary dipping of the Dacromet coating liquid and curing;
step five, recoating: and coating a high-hardness coating layer on the surface of the fastener after finishing the secondary dip-coating of the Dacromet coating liquid and curing, wherein the high-hardness coating is one of epoxy acrylic resin coating, modified silicone resin coating or polyurethane coating.
Further, the pretreatment in the step one comprises the following specific steps:
firstly, alkali washing degreasing and oil removing: degreasing the anti-loosening fastener by using degreasing fluid, wherein the degreasing temperature is 60-80 ℃, and the degreasing time is 5-8 min;
secondly, shot blasting and rust removing: placing the anti-loose fastener in a shot blasting machine for shot blasting for 5-8 min;
thirdly, cleaning: placing the anti-loose fastener subjected to shot blasting treatment into 95% ethanol with the volume fraction of 4-5 times of the mass of the anti-loose fastener, and ultrasonically cleaning for 15-20 min under the conditions that the ultrasonic frequency is 25-35 KHz and the power density is 0.40-0.50 w/cm 2;
fourthly, drying: and (3) carrying out vacuum drying on the cleaned anti-loose fastener for 25-30 min under the conditions of vacuum gauge pressure of-0.09-0.10 MPa and temperature of 60-70 ℃.
Furthermore, the degreasing solution contains 10-15 g/L NaOH and 20-25 g/L Na2CO350-60 g/L of Na2PO45 to 7g/L of Na2SiO3。
Further, the viscosity of the step Dada Crot coating liquid is 40 +/-2 s, and the density is 1.35-1.40 g/cm3A pH of 4.5 to 5.2, Cr6+The content is more than or equal to 23g/L, and the coating liquid temperature is 20 +/-2 ℃.
Further, in the second step, the anti-loose fastener is soaked in the Dacromet coating liquid for 30s, and the centrifugal spin-drying rotating speed is 240-280 r/min.
Further, the temperature condition in the preheating process is controlled to be 80-10 ℃ and the time is 10-15 min; in the baking and curing process, the temperature is controlled to be 280-310 ℃ and the time is 15-20 min.
Furthermore, the thickness of the primary Dacromet coating layer obtained by dip-coating the Dacromet coating liquid and curing in the fourth step is controlled to be 15-30 mu m, and the thickness of the secondary Dacromet coating layer obtained by dip-coating the Dacromet coating liquid and curing is controlled to be 30-60 mu m.
Further, the thickness of the high-hardness coating layer in the recoating step is 20-60 μm.
The performance test of the coating obtained on the surface of the anti-loose fastener treated by the scheme has the following results:
the foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (8)
1. The Dacromet coating method for the anti-loose fastener is characterized by comprising the following steps: the method comprises the following steps:
step one, pretreatment: sequentially carrying out degreasing, shot blasting and rust removal and cleaning treatment on the anti-loose fastener to be treated;
step two, phosphating treatment: placing the pretreated anti-loose fastener into phosphating solution at the temperature of 70-80 ℃ for phosphating surface treatment for 8-10 min, wherein the phosphating solution contains 40-50 g/L zinc dihydrogen phosphate and 25-30 g/L zinc nitrate;
step three, cleaning and saponification treatment: washing the phosphated anti-loose fastener for 2-3 min by using flowing cleaning, then placing the anti-loose fastener in sodium stearate with the temperature of 85-95 ℃ and the concentration of 10g/L for saponification for 5-10 min, and drying for later use;
step four, dipping-throwing coating Dacromet coating liquid twice and curing: dipping the anti-loose fastener processed in the third step into Dacromet coating liquid, sequentially carrying out the procedures of centrifugal drying, preheating, baking and curing and air cooling to finish primary dipping of the Dacromet coating liquid and curing, and repeating the processes to finish secondary dipping of the Dacromet coating liquid and curing;
step five, recoating: and coating a high-hardness coating layer on the surface of the fastener after finishing the secondary dip coating of the Dacromet coating liquid and curing, wherein the high-hardness coating is one of epoxy acrylic resin coating, modified silicone resin coating or polyurethane coating.
2. The method of claim 1 for Dacromet coating a check fastener, wherein: the pretreatment in the first step comprises the following specific steps:
firstly, alkali washing degreasing and oil removing: degreasing the anti-loosening fastener by using degreasing fluid, wherein the degreasing temperature is 60-80 ℃, and the degreasing time is 5-8 min;
secondly, shot blasting and rust removing: placing the anti-loose fastener in a shot blasting machine for shot blasting for 5-8 min;
thirdly, cleaning: placing the anti-loose fastener subjected to shot blasting treatment into 95% ethanol with the volume fraction of 4-5 times of the mass of the anti-loose fastener, and ultrasonically cleaning for 15-20 min under the conditions that the ultrasonic frequency is 25-35 KHz and the power density is 0.40-0.50 w/cm 2;
fourthly, drying: and (3) carrying out vacuum drying on the cleaned anti-loose fastener for 25-30 min under the conditions of vacuum gauge pressure of-0.09-0.10 MPa and temperature of 60-70 ℃.
3. The method of claim 2, wherein the coating comprises: the degreasing solution contains 10-15 g/L NaOH and 20-25 g/L Na2CO350-60 g/L of Na2PO45 to 7g/L of Na2SiO3。
4. The method of claim 1 for Dacromet coating a check fastener, wherein: step two, the Dacromet coating liquid has the viscosity of 40 +/-2 s and the density of 1.35-1.40 g/cm3A pH of 4.5 to 5.2, Cr6+The content is more than or equal to 23g/L, and the coating liquid temperature is 20 +/-2 ℃.
5. The method of claim 1 for Dacromet coating a check fastener, wherein: and secondly, soaking the anti-loose fastener in the Dacromet coating liquid for 30s, and carrying out centrifugal drying at a rotating speed of 240-280 r/min.
6. The method of claim 1 for Dacromet coating a check fastener, wherein: in the preheating procedure, the temperature is controlled to be 80-10 ℃ and the time is 10-15 min; in the baking and curing process, the temperature is controlled to be 280-310 ℃ and the time is 15-20 min.
7. The method of claim 1 for Dacromet coating a check fastener, wherein: the thickness of the primary Dacromet coating layer obtained by the primary dip-coating Dacromet coating liquid and the curing in the step four is controlled to be 15-30 mu m, and the thickness of the secondary Dacromet coating layer obtained by the secondary dip-coating Dacromet coating liquid and the curing is controlled to be 30-60 mu m.
8. The method of claim 1 for Dacromet coating a check fastener, wherein: the thickness of the high-hardness coating layer in the recoating step is 20-60 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111556943.9A CN114453225A (en) | 2021-12-18 | 2021-12-18 | Dacromet coating method for anti-loose fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111556943.9A CN114453225A (en) | 2021-12-18 | 2021-12-18 | Dacromet coating method for anti-loose fastener |
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| Publication Number | Publication Date |
|---|---|
| CN114453225A true CN114453225A (en) | 2022-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111556943.9A Withdrawn CN114453225A (en) | 2021-12-18 | 2021-12-18 | Dacromet coating method for anti-loose fastener |
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| CN (1) | CN114453225A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115156011A (en) * | 2022-06-23 | 2022-10-11 | 定西高强度紧固件股份有限公司 | Damage-proof and corrosion-proof method for anticorrosive coating of wind power fastener |
-
2021
- 2021-12-18 CN CN202111556943.9A patent/CN114453225A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115156011A (en) * | 2022-06-23 | 2022-10-11 | 定西高强度紧固件股份有限公司 | Damage-proof and corrosion-proof method for anticorrosive coating of wind power fastener |
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Application publication date: 20220510 |