CN111074202A - Long-acting stress corrosion cracking resistant segment bolt and manufacturing method thereof - Google Patents
Long-acting stress corrosion cracking resistant segment bolt and manufacturing method thereof Download PDFInfo
- Publication number
- CN111074202A CN111074202A CN201911422756.4A CN201911422756A CN111074202A CN 111074202 A CN111074202 A CN 111074202A CN 201911422756 A CN201911422756 A CN 201911422756A CN 111074202 A CN111074202 A CN 111074202A
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- Prior art keywords
- segment bolt
- temperature
- powder
- segment
- reaction vessel
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- 238000005260 corrosion Methods 0.000 title claims abstract description 46
- 230000007797 corrosion Effects 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000005336 cracking Methods 0.000 title description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
- 239000011812 mixed powder Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 14
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 238000005238 degreasing Methods 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 8
- 238000005422 blasting Methods 0.000 claims description 5
- 238000005488 sandblasting Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 2
- 125000004429 atom Chemical group 0.000 description 25
- 239000010410 layer Substances 0.000 description 14
- 238000009792 diffusion process Methods 0.000 description 9
- 239000002344 surface layer Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- DQIPXGFHRRCVHY-UHFFFAOYSA-N chromium zinc Chemical compound [Cr].[Zn] DQIPXGFHRRCVHY-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N SnO2 Inorganic materials O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910001586 aluminite Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
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
- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
- C23C10/34—Embedding in a powder mixture, i.e. pack cementation
- C23C10/52—Embedding in a powder mixture, i.e. pack cementation more than one element being diffused in one step
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
Abstract
Embodiments of the present disclosure provide segment bolts and methods of manufacturing the same. The method comprises the following steps: providing a segment bolt; placing the segment bolt and the mixed powder containing corrosion-resistant atoms into a reaction container for heating, and enabling the mixed powder containing corrosion-resistant atoms to be in contact with the surface of the segment bolt in the heating process; and raising the temperature in the reaction vessel to a predetermined temperature and maintaining the temperature at the predetermined temperature for a predetermined time.
Description
Technical Field
The disclosure relates to the field of surface treatment of segment bolts, in particular to a method for manufacturing a segment bolt capable of resisting stress corrosion cracking and the segment bolt.
Background
The segment bolt is an important connecting piece for fastening segments in tunnel construction and has to meet the requirements of high strength and long service life. But because the service environment of the segment bolt is moist, part of the service environment can also be contacted with salt particles with stronger corrosiveness, so that the segment bolt has extremely high risk of rusting in the service process. In order to avoid such risks and prolong the service life of the segment bolt, the segment bolt is usually subjected to surface treatment, and the currently commonly adopted surface treatment is hot galvanizing and zinc-chromium coating technology (commonly known as dacromet). The two technologies have positive effects on reducing the corrosion on the surface of the pipe piece.
However, in some practical cases, a serious accident that a plurality of segment bolts are broken occurs, and the segment bolts are analyzed to be broken due to stress corrosion. Stress corrosion cracking refers to the phenomenon that a component bears tensile stress and corrosion simultaneously in the service process, cracks are generated in the component, and then the component is cracked suddenly. It is extremely hazardous as it has no signs before breakage occurs.
The existing surface treatment technology based on hot galvanizing and zinc-chromium coating technologies comprises a strong acid solution, hydrogen atoms cannot permeate into a component, and the stress corrosion fracture resistance of the component is remarkably reduced, which has been proved by many case reports and literatures.
Therefore, a method for manufacturing a segment bolt capable of resisting stress corrosion cracking and a segment bolt are needed, and are very important for the safe service of a tunnel.
Disclosure of Invention
The present disclosure provides a method for manufacturing a segment bolt, including:
providing a segment bolt;
placing the segment bolt and the mixed powder containing corrosion-resistant atoms into a reaction container for heating, and enabling the mixed powder containing corrosion-resistant atoms to be in contact with the surface of the segment bolt in the heating process; and
the temperature in the reaction vessel is raised to a predetermined temperature and held at the predetermined temperature for a predetermined time.
In one embodiment, the mixed powder containing corrosion resisting atoms comprises tin powder, and the predetermined temperature is 300-400 ℃.
In one embodiment, contacting the mixed powder containing corrosion resistant atoms with the surface of the segment bolt during heating comprises inverting the reaction vessel during heating so that the mixed powder contacts the segment bolt.
In one embodiment, the sum of the volume of the segment bolt and the mixed powder containing the corrosion-resistant atoms accounts for 95-98% of the volume of the reaction container.
In one embodiment, before raising the temperature in the reaction vessel to the predetermined temperature, the temperature in the reaction vessel is raised to a first temperature and maintained at the first temperature for a first time, the first temperature being in a range of 190 to 210 ℃ and the first time being 15 to 25 minutes.
In one embodiment, the mixed powder containing corrosion resisting atoms further comprises one or more of zinc powder, aluminum powder and silicon dioxide powder.
In one embodiment, after the preset temperature is kept for 90-120 minutes, heating is stopped, and the segment bolt is taken out after the segment bolt is cooled to be below 60 ℃.
In one embodiment, providing the segment bolts includes a surface degreasing treatment and/or a descaling process for the segment bolts.
In one embodiment, the degreasing process for the surface of the segment bolt comprises an organic solvent degreasing, chemical degreasing, mechanical degreasing or wiping degreasing process; the rust removal process comprises one or more of mechanical rust removal processes including rolling, brushing, sand blasting or shot blasting.
In one embodiment, the powder mixture comprises 25-35 wt% of zinc powder, 2-5 wt% of aluminum powder, 1-2 wt% of tin powder and the balance of silicon dioxide powder.
In one embodiment, the particle size of the zinc powder is 150-250 meshes; the granularity of the silicon dioxide powder is 30-50 meshes; the tin powder has a particle size diameter of 30-80 μm, and the volume content of powder with a particle size diameter of less than 50 μm is not less than 80%.
In one embodiment, the reaction vessel is a reaction kettle, and the temperature is raised by placing the reaction kettle in a heating furnace for heating.
Embodiments of the present disclosure are also directed to a segment bolt manufactured by the above method of manufacturing a segment bolt, the segment bolt including a base and a surface alloy layer containing corrosion-resistant atoms, wherein the base and the surface alloy layer are metallurgically bonded.
Drawings
Fig. 1 is a flow chart of a method of manufacturing a segment bolt according to an embodiment of the present disclosure.
Fig. 2 is a schematic view of a temperature control curve of a temperature rise process of a method of manufacturing a segment bolt according to an embodiment of the present disclosure.
Detailed Description
The embodiment of the disclosure provides a long-acting stress corrosion cracking resistant pipe piece bolt atom diffusion treatment method, as shown in fig. 1, the pipe piece bolt atom diffusion treatment method comprises the following steps: placing the segment bolt and the mixed powder containing corrosion-resistant atoms into a reaction container for heating, and enabling the mixed powder containing corrosion-resistant atoms to be in contact with the surface of the segment bolt in the heating process; and raising the temperature in the reaction vessel to a predetermined temperature and maintaining the temperature at the predetermined temperature for a predetermined time. The reaction vessel can be a reaction kettle, and can be heated from the outside, for example, the sealed reaction kettle is placed in a heating furnace for heating; other reaction vessels are also possible, for example the shell of the reaction vessel itself provides radiant heating, for example resistance wire heating; any reaction vessel that can be warmed up can be used. In the reaction vessel, the segment bolt and the mixed powder containing corrosion-resistant atoms can be fully mixed and contacted, and at a preset temperature, the atoms in the mixed powder can diffuse from the surface of the segment bolt and enter the surface layer of the segment bolt to form an antirust surface. It should be noted that the rustproof surface is a change of a physical structure, the thickness of the rustproof surface is small, the macroscopic appearance of the segment bolt is not obviously changed, and a macroscopic view of the segment bolt before and after treatment is not provided.
Specifically, in practical application, the segment bolts can be pretreated, for example, the surfaces of the segment bolts to be treated are subjected to oil removal, rust removal, water washing and drying treatment, and the segment bolts with only slight rust on the surfaces are directly subjected to sand blasting or shot blasting treatment. It should be understood, however, that the pretreatment may be selected according to various conditions, and that the above-described degreasing, rust removal, sand blasting or shot blasting is not essential. And (3) loading the pretreated segment bolt and the mixed powder containing the corrosion-resistant atoms into a reaction kettle, and heating the reaction kettle so as to form a surface alloy layer containing the corrosion-resistant atoms on the surface layer of the segment bolt.
In one embodiment, the mixed powder containing corrosion resistant atoms has a predetermined composition and proportion, and the sum of the volumes of the mixed powder containing corrosion resistant atoms and the tube piece bolt filled in the atomic diffusion reaction kettle is 95-98% of the volume of the atomic diffusion reaction kettle.
When using for example reation kettle heating section of jurisdiction bolt and the mixed powder that contains corrosion resistant atom, can overturn reation kettle, make the section of jurisdiction bolt thermally equivalent in the reation kettle, guarantee simultaneously that mixed powder and section of jurisdiction bolt fully contact. The temperature raising process may be a temperature control process. In one embodiment, the heating temperature curve is shown in FIG. 2, the temperature is firstly kept for 15-25 minutes when the temperature is raised to T1, the temperature is kept at 190-210 ℃ at T1, the temperature is continuously raised to T2, the temperature is kept for 90-120 minutes, and then the heating is stopped. And then taking out the reaction kettle after cooling to below 100 ℃, and taking out the segment bolt from the reaction kettle at below 60 ℃.
In one embodiment of the present disclosure, the pressure may be increased in the reaction vessel. The pressure in the reaction kettle is increased, so that the corrosion-resistant atoms can be diffused to the surface of the segment bolt. However, this is not essential.
According to the embodiment of the disclosure, after the temperature raising and maintaining treatment, an alloy layer containing corrosion-resistant atoms is formed on the surface layer of the segment bolt, the alloy layer and the base segment bolt are bonded in a metallurgical manner, and the metallurgical bonding is formed by mutual diffusion of atoms between the interfaces of two pieces of metal. The bond is either in a bonded state or is formed under the influence of temperature or pressure (or both). Therefore, the alloy layer containing corrosion-resistant atoms formed on the surface layer of the segment bolt has super strong adhesive force, and can not fall off even under the working conditions of 180-degree bending, strong impact, severe weather, artificial damage and the like, so that the segment bolt keeps excellent corrosion resistance.
The manufacturing method of the segment bolt disclosed by the invention is not in contact with an acidic substance, so that the phenomenon that the strength of the segment bolt is reduced because hydrogen atoms permeate into the member is avoided; the substrate of the segment bolt and the alloy layer containing corrosion-resistant atoms on the surface layer of the segment bolt are combined in a metallurgical mode, have super strong adhesive force and scratch resistance, and greatly avoid the damage phenomenon in the construction and service process.
In the embodiment of the disclosure, the mixed powder comprises metallic tin powder, and metallic tin atoms are diffused to the surface of the segment bolt in the T1 low-temperature heat preservation stage; can also include zinc powder, aluminite powder in the mixed powder, the atomic structure on the top layer of section of jurisdiction bolt has been changed to the tin atom in the top layer of section of jurisdiction bolt of diffusion, the diffusion passageway that the zinc atom and aluminium atom obtain expanding, this makes zinc atom and aluminium atom diffuse fast to the top layer of section of jurisdiction bolt in the T2 heat preservation stage to zinc-containing aluminium atom content reaches about 80% in the resistant layer on the surface of messenger's final section of jurisdiction bolt, can show the anti-corrosion ability that improves the section of jurisdiction bolt. In the embodiment of the disclosure, when the surface of the segment bolt is rusted, the tin atoms can also be SnO2Form (b) is enriched at rust initiation sites, and further propagation of stress corrosion cracks is interrupted by raising the pH of the micro-zones between rust cracks.
The average thickness of the surface layer of the segment bolt manufactured by the segment bolt method disclosed by the invention is 40 microns, and the average hardness is 260 HV; the segment bolt has good corrosion resistance. The U-shaped bending stress corrosion test is adopted for detection, the initial crack appears after 144 hours of the original segment bolt test, and the crack is not found after 720 hours of the segment bolt test treated by the atomic diffusion treatment, which shows that the stress corrosion cracking resistance of the segment bolt treated by the atomic diffusion treatment is improved by more than 5 times at least.
According to the embodiment of the disclosure, the manufacturing method of the segment bolt comprises a pretreatment process, for example, the surface of the segment bolt is degreased by various methods such as organic solvent degreasing, chemical degreasing, mechanical degreasing or wiping degreasing; mechanical derusting methods, such as barrel polishing, brushing, sand blasting or shot blasting, are adopted for derusting.
According to the embodiment of the disclosure, the manufacturing method of the segment bolt comprises the steps of preparing mixed powder containing corrosion-resistant atoms, and specifically, mixing zinc powder, aluminum powder, tin powder and silicon dioxide powder according to a preset proportion, wherein the weight content of the zinc powder in the mixed powder is 25-35%, the weight content of the aluminum powder in the mixed powder is 2-5%, the weight content of the tin powder in the mixed powder is 1-2%, and the balance is the silicon dioxide powder.
According to the embodiment of the disclosure, in order to form a better alloy layer on the surface of the segment bolt, the purity of the zinc powder is required to exceed 98%, and the granularity is 150-250 meshes; the granularity of the silicon dioxide is 30-50 meshes; the particle size diameter range of the tin powder is 30-80 mu m, wherein the volume content of the powder with the particle size diameter of less than 50 mu m is not less than 80%.
Further, in order to enable the zinc powder, the aluminum powder, the tin powder and the silicon dioxide powder in the mixed powder to reach a certain particle size, the mixed powder can be ground and refined, and specifically, the mixed powder is refined and ground for more than 16 hours at the room temperature of 25 ℃.
The present disclosure also provides a segment bolt manufactured by the above method, which includes a substrate and a surface alloy layer containing corrosion-resistant atoms, wherein the substrate and the surface alloy layer are metallurgically bonded. The average thickness of the surface layer of the segment bolt was 40 μm, and the average hardness was 260 HV.
The above embodiments are only used for illustrating the technical solutions of the present disclosure, and not for limiting the same; although the present disclosure has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that, based on the technical content disclosed, the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.
Claims (13)
1. A method of manufacturing a segment bolt, comprising:
providing a segment bolt;
placing the segment bolt and the mixed powder containing corrosion-resistant atoms into a reaction container for heating, and enabling the mixed powder containing corrosion-resistant atoms to be in contact with the surface of the segment bolt in the heating process; and
the temperature in the reaction vessel is raised to a predetermined temperature and held at the predetermined temperature for a predetermined time.
2. The method for producing a segment bolt according to claim 1, wherein the mixed powder containing corrosion-resistant atoms includes tin powder, and the predetermined temperature is 300 to 400 ℃.
3. The method of producing a segment bolt according to claim 1, wherein bringing the mixed powder containing corrosion-resistant atoms into contact with the surface of the segment bolt during heating comprises turning over the reaction vessel so that the mixed powder comes into contact with the segment bolt during heating.
4. The method for producing a segment bolt according to claim 1, wherein the sum of the volumes of the segment bolt and the mixed powder containing corrosion-resistant atoms accounts for 95 to 98% of the volume of the reaction vessel.
5. The method for manufacturing a segment bolt according to claim 2, wherein the temperature in the reaction vessel is increased to a first temperature and maintained at the first temperature for a first time, the first temperature being in the range of 190 to 210 ℃, the first time being 15 to 25 minutes, before the temperature in the reaction vessel is increased to the predetermined temperature.
6. The method for producing a segment bolt according to claim 4, wherein the mixed powder containing corrosion-resistant atoms further comprises one or more of zinc powder, aluminum powder and silica powder.
7. The method for manufacturing a segment bolt according to claim 2, wherein after the predetermined temperature is maintained for 90-120 minutes, heating is stopped, and the segment bolt is taken out after being cooled to below 60 ℃.
8. The method for manufacturing a segment bolt according to claim 1, wherein the providing of the segment bolt comprises a degreasing treatment and/or a descaling process for the surface of the segment bolt.
9. The method for producing a segment bolt according to claim 8, wherein the step of removing oil from the surface of the segment bolt comprises a step of removing oil by organic solvent, chemical, mechanical or wiping;
the rust removal process comprises one or more of mechanical rust removal processes including rolling, brushing, sand blasting or shot blasting.
10. The method for manufacturing a segment bolt according to claim 6, wherein the segment bolt comprises 25-35 wt% of zinc powder, 2-5 wt% of aluminum powder, 1-2 wt% of tin powder and the balance of silica powder, which are mixed in a predetermined ratio.
11. The method for producing a segment bolt according to claim 6, wherein the zinc powder has a particle size of 150 to 250 mesh; the granularity of the silicon dioxide powder is 30-50 meshes; the tin powder has a particle size diameter of 30-80 μm, and the volume content of powder with a particle size diameter of less than 50 μm is not less than 80%.
12. The method for producing a segment bolt according to claim 1, wherein the reaction vessel is a reaction vessel, and the temperature is raised by heating the reaction vessel in a heating furnace.
13. A segment bolt produced by the method for producing a segment bolt according to any one of claims 1 to 12, comprising a base body and a surface alloy layer containing corrosion-resistant atoms, wherein the base body and the surface alloy layer are metallurgically bonded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911422756.4A CN111074202B (en) | 2019-12-31 | 2019-12-31 | Long-acting stress corrosion fracture resistant segment bolt and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911422756.4A CN111074202B (en) | 2019-12-31 | 2019-12-31 | Long-acting stress corrosion fracture resistant segment bolt and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN111074202A true CN111074202A (en) | 2020-04-28 |
| CN111074202B CN111074202B (en) | 2022-12-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112662248A (en) * | 2020-11-19 | 2021-04-16 | 宁波浩渤工贸有限公司 | Long-acting stress corrosion cracking resistant segment bolt and manufacturing method thereof |
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|---|---|---|---|---|
| US20040105998A1 (en) * | 2002-12-03 | 2004-06-03 | Itzhak Rosenthul | Corrosion resistant poly-metal diffusion coatings and a method of applying same |
| CN101280410A (en) * | 2008-05-19 | 2008-10-08 | 天津市钰源地紧固件有限公司 | Preparation technology of nanometer multi-component alloy co-cementation anti-corrosive coating |
| CN105695931A (en) * | 2014-11-26 | 2016-06-22 | 傅永红 | Chromium plating process for small shaft parts |
-
2019
- 2019-12-31 CN CN201911422756.4A patent/CN111074202B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040105998A1 (en) * | 2002-12-03 | 2004-06-03 | Itzhak Rosenthul | Corrosion resistant poly-metal diffusion coatings and a method of applying same |
| CN101280410A (en) * | 2008-05-19 | 2008-10-08 | 天津市钰源地紧固件有限公司 | Preparation technology of nanometer multi-component alloy co-cementation anti-corrosive coating |
| CN105695931A (en) * | 2014-11-26 | 2016-06-22 | 傅永红 | Chromium plating process for small shaft parts |
Non-Patent Citations (1)
| Title |
|---|
| 胡传炘主编: "《表面处理手册》", 31 March 2004 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112662248A (en) * | 2020-11-19 | 2021-04-16 | 宁波浩渤工贸有限公司 | Long-acting stress corrosion cracking resistant segment bolt and manufacturing method thereof |
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| CN111074202B (en) | 2022-12-27 |
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