CN112522716A - Acid pickling passivation process for reamer - Google Patents
Acid pickling passivation process for reamer Download PDFInfo
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- CN112522716A CN112522716A CN202011382748.4A CN202011382748A CN112522716A CN 112522716 A CN112522716 A CN 112522716A CN 202011382748 A CN202011382748 A CN 202011382748A CN 112522716 A CN112522716 A CN 112522716A
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- reamer
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- taking out
- passivation process
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- 238000005554 pickling Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000002253 acid Substances 0.000 title claims abstract description 29
- 238000002161 passivation Methods 0.000 title claims abstract description 27
- 238000005406 washing Methods 0.000 claims abstract description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 40
- 239000000243 solution Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000009210 therapy by ultrasound Methods 0.000 claims description 15
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 14
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 12
- 239000011241 protective layer Substances 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- DCAYPVUWAIABOU-UHFFFAOYSA-N hexadecane Chemical group CCCCCCCCCCCCCCCC DCAYPVUWAIABOU-UHFFFAOYSA-N 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 10
- STIAPHVBRDNOAJ-UHFFFAOYSA-N carbamimidoylazanium;carbonate Chemical compound NC(N)=N.NC(N)=N.OC(O)=O STIAPHVBRDNOAJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000001509 sodium citrate Substances 0.000 claims description 9
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 9
- QDWYPRSFEZRKDK-UHFFFAOYSA-M sodium;sulfamate Chemical compound [Na+].NS([O-])(=O)=O QDWYPRSFEZRKDK-UHFFFAOYSA-M 0.000 claims description 9
- -1 1-ethyl Chemical group 0.000 claims description 8
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 7
- ULUAUXLGCMPNKK-UHFFFAOYSA-N Sulfobutanedioic acid Chemical compound OC(=O)CC(C(O)=O)S(O)(=O)=O ULUAUXLGCMPNKK-UHFFFAOYSA-N 0.000 claims description 7
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 claims description 7
- 229940073507 cocamidopropyl betaine Drugs 0.000 claims description 7
- 229940102396 methyl bromide Drugs 0.000 claims description 7
- GZUXJHMPEANEGY-UHFFFAOYSA-N methyl bromide Substances BrC GZUXJHMPEANEGY-UHFFFAOYSA-N 0.000 claims description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims description 7
- 239000012286 potassium permanganate Substances 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229940070765 laurate Drugs 0.000 claims description 6
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 238000002604 ultrasonography Methods 0.000 claims description 5
- 235000013162 Cocos nucifera Nutrition 0.000 claims description 4
- 244000060011 Cocos nucifera Species 0.000 claims description 4
- 238000005202 decontamination Methods 0.000 claims description 4
- 230000003588 decontaminative effect Effects 0.000 claims description 4
- 229940098691 coco monoethanolamide Drugs 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 15
- 238000012360 testing method Methods 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000004506 ultrasonic cleaning Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 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
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention belongs to the technical field of high-end cutter manufacturing, and particularly relates to an acid pickling passivation process for a reamer. Mainly comprises the steps of pretreatment, temperature rise, acid washing, post-treatment and the like. Compared with the prior art, the acid pickling passivation process for the reamer changes a normal-temperature acid pickling mode adopted by a conventional acid pickling passivation process, and is matched with deep optimization of components of an acid pickling solution, so that the surface microstructure of a passivation layer is influenced, and the passivation layer with stable surface property and excellent corrosion resistance is finally obtained.
Description
Technical Field
The invention belongs to the technical field of high-end cutter manufacturing, and particularly relates to an acid pickling passivation process for a reamer.
Background
The reamer is a rotary finishing tool with a straight edge or a spiral edge, can cut off a thin layer of metal on the surface of a machined hole, and is commonly used for reaming or repairing the hole. The machining accuracy of the reamer is generally higher than that of the drill due to the small cutting amount, and higher strength and surface stability are required to be achieved. In the production process of the reamer, the acid pickling passivation is an important process for surface treatment of the reamer and plays an important role in the stability of the surface of the reamer and the durability in the using process. In the past, how to optimize the passivation process to make the oxide skin formed on the surface of the reamer more compact, continuous and stable so as to make the reamer obtain more excellent durability is a constantly pursued goal of the technicians.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an acid pickling passivation process for a reamer, which comprises the following steps:
(S1) washing the surface of the reamer to remove oil stains, then washing the surface of the reamer to remove residual decontamination components during decontamination, and drying.
(S2) heating the whole reamer to 250-270 ℃ in a reducing atmosphere, and keeping the temperature for a period of time to make the internal and external temperatures of the reamer consistent.
(S3) taking out the heated reamer from the reducing atmosphere, with the tool bit facing downward, and immediately inserting the reamer into the pickling solution; when the reamer is inserted, the pickling solution needs to be subjected to ultrasonic treatment until bubbles on the surface of the reamer completely disappear and new bubbles are not generated; then turning off the ultrasound, and continuing to soak for 25-35 min; the pickling solution comprises the following components in parts by weight: 100 parts of water, 15-22 parts of nitric acid, 4-5 parts of hydrochloric acid, 6-8 parts of hydrofluoric acid, 0.5-0.9 part of potassium permanganate, 1-1.5 parts of hydrogen peroxide, 3-5 parts of sodium sulfamate, 2-3 parts of guanidine carbonate, 2-3 parts of o-hydroxy laurate lactone, 0.2-0.3 part of 1-ethyl acetate-3-methyl bromide salt, 0.2-0.3 part of sodium citrate, 0.1-0.2 part of disodium cocoanut monoethanolamide sulfosuccinate and 0.2-0.3 part of cocamidopropyl betaine.
(S4) taking out the reamer, washing off the residual acid liquor on the surface, and covering an oily protective layer on the surface.
Preferably, the step (S1) is soaking the reamer in 0.1-0.2mol/L sodium carbonate solution at 60-80 ℃, and ultrasonically cleaning for 20-30 min; taking out the reamer, soaking the reamer into a mixed solution of ethanol and water with the mass fraction of the ethanol being 60-70%, and carrying out ultrasonic treatment for 20-30 min; taking out the reamer and drying.
Preferably, in the step (S2), the reducing atmosphere is a mixture of hydrogen and nitrogen, wherein the volume fraction of hydrogen is 5-7%; the heat preservation time is 45-60 min.
Preferably, in the step (S3), the pickling solution is composed of the following components by weight: 100 parts of water, 20 parts of nitric acid, 4 parts of hydrochloric acid, 7 parts of hydrofluoric acid, 0.6 part of potassium permanganate, 1.2 parts of hydrogen peroxide, 4 parts of sodium sulfamate, 2.3 parts of guanidine carbonate, 2.5 parts of o-hydroxy-laurate lactone, 0.2 part of 1-ethyl acetate-3-methyl bromide, 0.3 part of sodium citrate, 0.12 part of disodium cocomonoethanolamide sulfosuccinate and 0.25 part of cocamidopropyl betaine.
Preferably, the step (S4) is: taking out the reamer, immersing the reamer into an aqueous solution containing 0.02mol/L sodium hydroxide and 0.1mol/L sodium bicarbonate, and ultrasonically cleaning for 15-25 min; then immersing the reamer into a mixed solution of ethanol and water with the mass fraction of the ethanol being 60-70%, and carrying out ultrasonic treatment for 20-30 min; then placing the reamer in acetone for soaking for 5min, taking out the reamer and drying the reamer by clean air flow; the surface is coated with an oily protective layer n-hexadecane, and the oily protective layer is covered by adopting a mode of immersing, taking out and draining.
Has the advantages that: compared with the prior art, the acid pickling passivation process for the reamer changes a normal-temperature acid pickling mode adopted by a conventional acid pickling passivation process, and is matched with deep optimization of components of an acid pickling solution, so that the surface microstructure of a passivation layer is influenced, and the passivation layer with stable surface property and excellent corrosion resistance is finally obtained.
Detailed Description
The invention is further illustrated by the following specific examples, which are illustrative and intended to illustrate the problem and explain the invention, but not limiting.
Example 1
An acid pickling passivation process for a reamer, comprising the steps of:
(S1) soaking the reamer in 0.15mol/L sodium carbonate solution at 60 ℃, and ultrasonically cleaning for 20 min; taking out the reamer, then immersing the reamer into a mixed solution of ethanol and water with the mass fraction of the ethanol being 60%, and carrying out ultrasonic treatment for 20 min; taking out the reamer and drying.
(S2) heating the whole reamer to 260 ℃ in a reducing atmosphere, and keeping the temperature for 45 min; the reducing atmosphere is a mixture of hydrogen and nitrogen, wherein the volume fraction of hydrogen is 6%.
(S3) taking out the heated reamer from the reducing atmosphere, with the tool bit facing downward, and immediately inserting the reamer into the pickling solution; when the reamer is inserted, the pickling solution needs to be subjected to ultrasonic treatment until bubbles on the surface of the reamer completely disappear and new bubbles are not generated; then turning off the ultrasound, and continuing to soak for 25-35 min; the pickling solution comprises the following components in parts by weight: 100 parts of water, 20 parts of nitric acid, 4 parts of hydrochloric acid, 7 parts of hydrofluoric acid, 0.6 part of potassium permanganate, 1.2 parts of hydrogen peroxide, 4 parts of sodium sulfamate, 2.3 parts of guanidine carbonate, 2.5 parts of o-hydroxy-laurate lactone, 0.2 part of 1-ethyl acetate-3-methyl bromide, 0.3 part of sodium citrate, 0.12 part of disodium cocomonoethanolamide sulfosuccinate and 0.25 part of cocamidopropyl betaine.
(S4) taking out the reamer, immersing the reamer into an aqueous solution containing 0.02mol/L sodium hydroxide and 0.1mol/L sodium bicarbonate, and carrying out ultrasonic cleaning for 20 min; then immersing the reamer into a mixed solution of ethanol and water with the mass fraction of the ethanol being 60%, and carrying out ultrasonic treatment for 30 min; then placing the reamer in acetone for soaking for 5min, taking out the reamer and drying the reamer by clean air flow; and coating an oily protective layer on the surface, wherein the oily protective layer is n-hexadecane and is covered by adopting a mode of immersing, taking out and draining.
Example 2
An acid pickling passivation process for a reamer, comprising the steps of:
(S1) soaking the reamer in 0.1mol/L sodium carbonate solution at 60 ℃, and ultrasonically cleaning for 20 min; taking out the reamer, then immersing the reamer into a mixed solution of ethanol and water with the mass fraction of the ethanol being 60%, and carrying out ultrasonic treatment for 20 min; taking out the reamer and drying.
(S2) heating the whole reamer to 250 ℃ in a reducing atmosphere, and keeping the temperature for 45 min; the reducing atmosphere is a mixture of hydrogen and nitrogen, wherein the volume fraction of hydrogen is 5%.
(S3) taking out the heated reamer from the reducing atmosphere, with the tool bit facing downward, and immediately inserting the reamer into the pickling solution; when the reamer is inserted, the pickling solution needs to be subjected to ultrasonic treatment until bubbles on the surface of the reamer completely disappear and new bubbles are not generated; then turning off the ultrasound, and continuing to soak for 35 min; the pickling solution comprises the following components in parts by weight: 100 parts of water, 15 parts of nitric acid, 4 parts of hydrochloric acid, 6 parts of hydrofluoric acid, 0.5 part of potassium permanganate, 1 part of hydrogen peroxide, 3 parts of sodium sulfamate, 3 parts of guanidine carbonate, 2 parts of o-hydroxy-lauric acid lactone, 0.2 part of 1-ethyl acetate-3-methyl bromide, 0.2 part of sodium citrate, 0.1 part of disodium cocoanut monoethanolamide sulfosuccinate and 0.2 part of cocamidopropyl betaine.
(S4) taking out the reamer, immersing the reamer into an aqueous solution containing 0.02mol/L sodium hydroxide and 0.1mol/L sodium bicarbonate, and carrying out ultrasonic cleaning for 15 min; then immersing the reamer into a mixed solution of ethanol and water with the mass fraction of the ethanol being 60%, and carrying out ultrasonic treatment for 20 min; then placing the reamer in acetone for soaking for 5min, taking out the reamer and drying the reamer by clean air flow; and coating an oily protective layer on the surface, wherein the oily protective layer is n-hexadecane and is covered by adopting a mode of immersing, taking out and draining.
Example 3
An acid pickling passivation process for a reamer, comprising the steps of:
(S1) soaking the reamer in 0.2mol/L sodium carbonate solution at 80 ℃, and ultrasonically cleaning for 30 min; taking out the reamer, then immersing the reamer into a mixed solution of ethanol and water with the mass fraction of the ethanol being 70%, and carrying out ultrasonic treatment for 30 min; taking out the reamer and drying.
(S2) heating the whole reamer to 270 ℃ in a reducing atmosphere, and keeping the temperature for 60 min; the reducing atmosphere is a mixture of hydrogen and nitrogen, wherein the volume fraction of hydrogen is 7%.
(S3) taking out the heated reamer from the reducing atmosphere, with the tool bit facing downward, and immediately inserting the reamer into the pickling solution; when the reamer is inserted, the pickling solution needs to be subjected to ultrasonic treatment until bubbles on the surface of the reamer completely disappear and new bubbles are not generated; then turning off the ultrasound, and continuing to soak for 25 min; the pickling solution comprises the following components in parts by weight: 100 parts of water, 22 parts of nitric acid, 5 parts of hydrochloric acid, 8 parts of hydrofluoric acid, 0.9 part of potassium permanganate, 1.5 parts of hydrogen peroxide, 5 parts of sodium sulfamate, 3 parts of guanidine carbonate, 3 parts of o-hydroxy-laurate lactone, 0.3 part of 1-ethyl acetate-3-methyl bromide, 0.3 part of sodium citrate, 0.2 part of disodium cocoanut monoethanolamide sulfosuccinate and 0.3 part of cocamidopropyl betaine.
(S4) taking out the reamer, immersing the reamer into an aqueous solution containing 0.02mol/L sodium hydroxide and 0.1mol/L sodium bicarbonate, and carrying out ultrasonic cleaning for 25 min; then immersing the reamer into a mixed solution of ethanol and water with the mass fraction of the ethanol being 70%, and carrying out ultrasonic treatment for 30 min; then placing the reamer in acetone for soaking for 5min, taking out the reamer and drying the reamer by clean air flow; and coating an oily protective layer on the surface, wherein the oily protective layer is n-hexadecane and is covered by adopting a mode of immersing, taking out and draining.
Comparative example 1
The heating step in the step (S2) was omitted, and the remaining operations were the same as in example 1.
Comparative example 2
The same procedure as in example 1 was repeated except that sodium sulfamate in the pickling solution was removed.
Comparative example 3
The procedure of example 1 was repeated except that guanidine carbonate in the pickling solution was removed.
Comparative example 4
The same procedure as in example 1 was repeated except for removing 1-ethoxycarbonyl-3-methylbromide from the pickling solution.
Comparative example 5
The same procedure as in example 1 was repeated except that sodium citrate in the pickling solution was removed.
Comparative example 6
The same procedure as in example 1 was repeated except that deionized water was used in place of the acid wash.
Comparative example 7
No treatment was performed.
Performance testing
Taking YG3X (K01) reamers in the same batch, respectively carrying out surface treatment by adopting the processes described in the embodiments and the respective comparative examples, putting each sample obtained by treatment into a salt spray test box, and periodically observing and recording the time when rusty spots visible to naked eyes appear on the surface of each sample. The settling liquid is an aqueous solution containing sodium chloride and hydrochloric acid, the sodium chloride accounts for 5% by mass, and the pH value is 3.0; the salt spray sedimentation rate is 2ml/(80 cm)2H), the test chamber temperature is 30 + -2 ℃, and the maximum exposure time is 480 h. The results of the performance tests are shown in table 1.
TABLE 1 Corrosion resistance test results
| Sample examples | Acid salt spray test time (h) |
| Example 1 | ＞480 |
| Example 2 | ＞480 |
| Example 3 | ＞480 |
| Comparative example 1 | 17 |
| Comparative example 2 | 25 |
| Comparative example 3 | 8 |
| Comparative example 4 | 7 |
| Comparative example 5 | 29 |
| Comparative example 6 | 3 |
| Comparative example 7 | 4 |
As can be seen from Table 1, the pickling passivation process provided by the invention achieves an excellent passivation effect, so that the corrosion resistance of the reamer is remarkably improved. Among them, the change of the pickling temperature and the optimization of the components of the pickling solution are necessary conditions for obtaining excellent corrosion resistance. From the data of the salt spray test, certain synergistic effect is shown between the temperature control and the elements such as guanidine carbonate, 1-ethyl acetate-3-methyl bromide, sodium sulfamate, sodium citrate and the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (7)
1. An acid pickling passivation process for a reamer, which is characterized in that: the method comprises the following steps:
(S1) washing off oil stains on the surface of the reamer, then washing off residual decontamination components on the surface during decontamination, and drying;
(S2) heating the whole reamer to 250-270 ℃ in a reducing atmosphere, and keeping the temperature for a period of time to ensure that the internal and external temperatures of the reamer are consistent;
(S3) taking out the heated reamer from the reducing atmosphere, with the tool bit facing downward, and immediately inserting the reamer into the pickling solution; when the reamer is inserted, the pickling solution needs to be subjected to ultrasonic treatment until bubbles on the surface of the reamer completely disappear and new bubbles are not generated; then turning off the ultrasound, and continuing to soak for 25-35 min; the pickling solution comprises the following components in parts by weight: 100 parts of water, 15-22 parts of nitric acid, 4-5 parts of hydrochloric acid, 6-8 parts of hydrofluoric acid, 0.5-0.9 part of potassium permanganate, 1-1.5 parts of hydrogen peroxide, 3-5 parts of sodium sulfamate, 2-3 parts of guanidine carbonate, 2-3 parts of o-hydroxy laurate lactone, 0.2-0.3 part of 1-ethyl acetate-3-methyl bromide salt, 0.2-0.3 part of sodium citrate, 0.1-0.2 part of disodium cocoanut monoethanolamide sulfosuccinate and 0.2-0.3 part of cocamidopropyl betaine;
(S4) taking out the reamer, washing off the residual acid liquor on the surface, and covering an oily protective layer on the surface.
2. The acid pickling passivation process for reamers according to claim 1, characterized in that: step (S1) is to soak the reamer in 0.1-0.2mol/L sodium carbonate solution at 60-80 ℃, and ultrasonically clean for 20-30 min; taking out the reamer, soaking the reamer into a mixed solution of ethanol and water with the mass fraction of the ethanol being 60-70%, and carrying out ultrasonic treatment for 20-30 min; taking out the reamer and drying.
3. The acid pickling passivation process for reamers according to claim 1, characterized in that: in the step (S2), the reducing atmosphere is a mixture of hydrogen and nitrogen, wherein the volume fraction of hydrogen is 5-7%.
4. The acid pickling passivation process for reamers according to claim 3, characterized in that: in step (S2), the heat preservation time is 45-60 min.
5. The acid pickling passivation process for reamers according to claim 1, characterized in that: in the step (S3), the pickling solution is composed of the following components by weight: 100 parts of water, 20 parts of nitric acid, 4 parts of hydrochloric acid, 7 parts of hydrofluoric acid, 0.6 part of potassium permanganate, 1.2 parts of hydrogen peroxide, 4 parts of sodium sulfamate, 2.3 parts of guanidine carbonate, 2.5 parts of o-hydroxy-laurate lactone, 0.2 part of 1-ethyl acetate-3-methyl bromide, 0.3 part of sodium citrate, 0.12 part of disodium cocomonoethanolamide sulfosuccinate and 0.25 part of cocamidopropyl betaine.
6. The acid pickling passivation process for reamers according to claim 1, characterized in that: the step (S4) is: taking out the reamer, immersing the reamer into an aqueous solution containing 0.02mol/L sodium hydroxide and 0.1mol/L sodium bicarbonate, and ultrasonically cleaning for 15-25 min; then immersing the reamer into a mixed solution of ethanol and water with the mass fraction of the ethanol being 60-70%, and carrying out ultrasonic treatment for 20-30 min; then placing the reamer in acetone for soaking for 5min, taking out the reamer and drying the reamer by clean air flow; the surface is coated with an oily protective layer.
7. The acid pickling passivation process for reamers according to claim 6, characterized in that: the step (S4) is: the oily protective layer is n-hexadecane and is covered by adopting a mode of immersing, taking out and draining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011382748.4A CN112522716A (en) | 2020-12-01 | 2020-12-01 | Acid pickling passivation process for reamer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011382748.4A CN112522716A (en) | 2020-12-01 | 2020-12-01 | Acid pickling passivation process for reamer |
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| Publication Number | Publication Date |
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| CN112522716A true CN112522716A (en) | 2021-03-19 |
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| CN (1) | CN112522716A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113305364A (en) * | 2021-06-29 | 2021-08-27 | 镇江市人杰医疗器械有限公司 | Direct-insertion type flexible rod reamer capable of rotating forwards and reversely and using method thereof |
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| JPS61279311A (en) * | 1985-06-05 | 1986-12-10 | Sumitomo Metal Ind Ltd | Pickling method for hot rolled steel sheet |
| JPH059767A (en) * | 1991-07-09 | 1993-01-19 | Sumitomo Metal Ind Ltd | Treatment of steel pipe for bearing before pickling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113305364A (en) * | 2021-06-29 | 2021-08-27 | 镇江市人杰医疗器械有限公司 | Direct-insertion type flexible rod reamer capable of rotating forwards and reversely and using method thereof |
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