CN111394717A - External thread cutting ferrule connects - Google Patents
External thread cutting ferrule connects Download PDFInfo
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- CN111394717A CN111394717A CN202010358902.8A CN202010358902A CN111394717A CN 111394717 A CN111394717 A CN 111394717A CN 202010358902 A CN202010358902 A CN 202010358902A CN 111394717 A CN111394717 A CN 111394717A
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- parts
- phosphating
- ferrule joint
- film
- phosphating solution
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Classifications
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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
- C23C22/07—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
-
- 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
- C23C22/40—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 molybdates, tungstates or vanadates
- C23C22/42—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 molybdates, tungstates or vanadates containing also phosphates
Abstract
The invention discloses an external thread ferrule joint, wherein the outer surfaces of all parts of the ferrule joint are treated by phosphating solution to form phosphating films, and the phosphating solution comprises, by weight, 210 parts of phosphoric acid and 240 parts of phosphoric acid; 30-40 parts of zinc salt; 15-20 parts of manganese salt; 20-25 parts of a dispersing agent; and 20-25 parts of an accelerator. After the ferrule joint is put into the phosphating solution, an anodic oxidation process of Fe occurs on the surface of the ferrule joint to generate substances such as Fe (H2PO4)2, Zn (H2PO4)2, Zn3(PO4) 2.4H 2O and Zn2Fe (PO4) 2.4H 2O, when the phosphating reaction is carried out until the concentrations of the substances reach respective solubility products, the insoluble phosphates form crystal nuclei on active points on the surface of the ferrule joint and extend and grow towards the periphery of the surface by taking the crystal nuclei as centers to form crystals until a continuous and uniform phosphating film is formed on the surface of the metal to be treated. The manganese salt can accelerate the anodic oxidation process of Fe generated on the surface of the ferrule joint and the film forming speed of a phosphating film on the surface of the metal. So that the surface of the cutting ferrule joint forms a continuous, uniform and compact phosphating film to play a continuous protection role.
Description
Technical Field
The invention relates to the technical field of connecting pieces, in particular to an external thread ferrule joint.
Background
The ferrule type pipe joint consists of three parts: the connector body, the clamping sleeve and the nut are widely applied to various industries such as chemical industry, pharmacy, petroleum, scientific experiments, electrical engineering and the like. After the clamping sleeve and the nut are sleeved on the steel pipe and inserted into the joint body, when the nut is screwed, the outer side of the front end of the clamping sleeve is attached to the conical surface of the joint body, and the inner blade is uniformly engaged with the seamless steel pipe to form effective sealing.
Chinese patent publication No. CN204114387U discloses a ferrule type pipe joint, which comprises a joint body, a ferrule and a connecting pipe, wherein the joint body is provided with a through hole in the axial direction, a first external thread is provided on an outer wall of one end of the joint body, a second external thread is provided on an outer wall of the other end, the ferrule comprises a first ferrule and a second ferrule, a first tapered surface is provided on an outer wall of the first ferrule, a second tapered surface is provided on an inner side wall of one end of the joint body close to the second external thread, a first step is provided on an inner wall of the joint body at the first tapered surface, the first tapered surface and the second tapered surface are connected by extrusion fit, the connecting pipe is connected with the joint body by a compression nut, an internal thread is provided on an inner side wall of the compression nut, the internal thread is connected with the second external thread in a matching manner, one end of the connecting pipe passes, the through hole is communicated with the connecting pipe.
Because the cutting ferrule connects the accessory that need not to change for long-term use usually, in long-time use, lead to sealing performance to descend or lead to later stage to overhaul difficult the dismantlement because of the oxidation easily, some treat the improvement.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an external thread ferrule joint, the surface of which is provided with a phosphating film with a tight film forming effect, so that the external thread ferrule joint has a good long-term protection effect and has the effect of remarkably reducing the oxidation speed of the ferrule joint.
In order to achieve the purpose, the invention provides the following technical scheme:
an external screw thread cutting ferrule connects which characterized in that: the outer surfaces of all parts of the clamping sleeve head are treated by phosphating solution to form phosphating films, and the phosphating solution comprises the following components in parts by weight,
210 portions and 240 portions of phosphoric acid;
30-40 parts of zinc salt;
15-20 parts of manganese salt;
20-25 parts of a dispersing agent;
20-25 parts of an accelerator;
the zinc salt is zinc oxide.
By adopting the technical scheme, phosphoric acid and zinc oxide are main film forming substances, and before phosphating, three-stage ionization equilibrium reaction of free phosphoric acid and a series of ionization and hydrolysis dynamic equilibrium reaction of zinc oxide with the phosphoric acid exist in phosphating solution.
After the ferrule joint is put into the phosphating solution, the anodic oxidation process of Fe occurs on the surface of the ferrule joint to generate Fe (H)2PO4)2、Zn(H2PO4)2、Zn3(PO4)2·4H2O and Zn2Fe(PO4)2·4H2And O and other substances, when the phosphating reaction is carried out until the concentrations of the substances reach respective solubility products, the insoluble phosphate forms crystal nuclei on active points on the surface of the ferrule joint, and the crystal nuclei are continuously extended and grown towards the periphery of the surface to form crystals by taking the crystal nuclei as centers until the treated metal surface forms a continuous and uniform phosphating film.
And the addition of manganese salt can accelerate the anodic oxidation process of Fe generated on the surface of the ferrule joint and the film forming speed of a phosphating film on the surface of the metal. Meanwhile, the addition of the accelerator further improves the film forming speed and the film forming quality of the phosphating film.
Finally, a continuous, uniform and compact phosphating film is formed on the surface of the clamping sleeve joint, and the clamping sleeve joint is continuously protected.
Further, the phosphating solution comprises 1-2 parts by weight of copper nitrate.
Through adopting above-mentioned technical scheme, because the electrode potential of copper is more positive than the electrode potential of iron, the copper ion is reduced and is deposited in the cutting ferrule joint surface by the bonderizing to increased surperficial cathodic region, further promoted the electrochemical reaction of bonderizing, accelerated the formation of bonderizing crystal nucleus, refine the crystalline grain, make the bonderizing membrane compact, even, improve the bonderizing speed simultaneously, reduce the bonderizing temperature, finally make the bonderizing membrane have the advantage that the film-forming is inseparable, adhesive force is strong.
Further, the phosphating solution comprises 7-10 parts by weight of citric acid.
By adopting the technical scheme, ferric ions can be generated under the oxidation of individual components in the phosphating process, and then Fe (PO) is generated4)3The sediment affects the phosphorization film forming speed and the film forming quality. The citric acid as the compounding agent can effectively complex ferric ions and reduce sediments. Meanwhile, the weak acidity of the citric acid can also increase active points on the surface of the organism and promote the initial formation of a phosphorization crystal nucleus, so that the effect of refining the film layer is achieved, and the phosphorization film is more compact.
Further, the raw material comprises 15-20 parts by weight of sodium molybdate.
By adopting the technical scheme, the method has the advantages that,
in the process of phosphorization, the catalyst can play the roles of oxidizing agent, corrosion inhibitor, complexing agent and reducing the weight of the film layer. Because of the fact that
Can form various condensed polyacid ions by the condensation of oxygen polyhedron at the same point or edge, and the basic structural unit is octahedral MoO in the polyacid anion structure of molybdenum6When it is reacted with an orthophosphate salt,
regular tetrahedron is immediately MoO6Octahedral enclosure, i.e. filling of heteroatoms in the centre of the polyacid ion to form a heteropolyacid: phosphomolybdic acid (H)3PO4·12MoO3·30H2O). Coordinated MoO of molybdenum in phosphomolybdic acid3Much more active in the molecule than in free molybdic acid or normal molybdate; in a solution containing an inorganic acid, the phosphate reacts with the aforementioned phosphomolybdic acid to produce a salt of complex phosphomolybdic acid.
Phosphomolybdates, in turn, have a strong oxidizing effect on many inorganic and organic compounds. The strong oxidation accelerates the anodic oxidation process of the surface of the ferrule joint, and the complex phosphomolybdate ions (heteropoly acid ions) can promote depolarization of the surface of the cathode, improve the density of micro-current, and partially seal the surface of the anode, so that the area ratio of the cathode to the anode is increased, and the phosphating speed is greatly accelerated. The heteropolyacid is adsorbed on the surface of the ferrule joint or embedded in the micropores of the phosphating film, so that a more compact arrangement is generated, and the quality of the phosphating film is improved.
Further, triethanolamine is used as the accelerator.
By adopting the technical scheme, the triethanolamine is a ligand with strong coordination capacity, has four effective groups in the molecule, can form a five-membered ring chelate with metal, is insoluble in water and is adsorbed on the surface layer of a phosphating film or in the pores of the film. The triethanolamine in the phosphating solution firstly passes through the central atom N of the polar group and the active H in the solution+Coordinate to form onium ion, and physically adsorb on the surface of the ferrule or cathode region with negative charge to block H+Proximity to ferrule fitting surface to inhibit H+The reduction reaction of (2) and further carrying out comprehensive chemical adsorption on the Fe atoms or ions of the bayonet joint with central atoms of N and O with unshared electron pairs, and the charged onium ions adsorb the ions in the solution
And
thereby promoting the film formation and enhancing the corrosion resistance of the film, and further reacting with Fe (H)2PO4)2And Zn (H)2PO4)2And (3) generating a composite phosphate protective film with organic groups on the surface of the ferrule joint.
In addition, the citric acid can enable the absorbed hydrocarbon chains with hydroxyl in triethanolamine molecules to be closer to the surface of the ferrule joint, so that a chelating insoluble film is formed to cover the original exposed part, and the absorption is more stable.
Further, PTFE is adopted as the dispersing agent.
By adopting the technical scheme, PTFE (polytetrafluoroethylene) has extremely low friction coefficient, good lubricating and dispersing effects and improves the uniformity of a phosphating film. In addition, PTFE has good volatility, and the in-process of drying can continuously volatilize to constantly reduce the surface tension of bonderizing membrane here, make the bonderizing membrane compacter stable, also make the bonderizing membrane have better adhesive force and be difficult for droing on the cutting ferrule connects the surface simultaneously, make the bonderizing membrane can play long-time continuous guard action to the cutting ferrule connects.
Further, the phosphating solution treatment comprises the following steps:
s1, surface treatment: removing oil and rust on the surface and washing;
s2, phosphating and coating: putting the mixture into a phosphating solution for phosphating;
s3, drying: heating, drying, washing and drying.
In conclusion, the invention has the following beneficial effects:
1. after the ferrule joint is put into the phosphating solution, the anodic oxidation process of Fe occurs on the surface of the ferrule joint to generate Fe (H)2PO4)2、Zn(H2PO4)2、Zn3(PO4)2·4H2O and Zn2Fe(PO4)2·4H2And O and other substances, when the phosphating reaction is carried out until the concentrations of the substances reach respective solubility products, the insoluble phosphate forms crystal nuclei on active points on the surface of the ferrule joint, and the crystal nuclei are continuously extended and grown towards the periphery of the surface to form crystals by taking the crystal nuclei as centers until the treated metal surface forms a continuous and uniform phosphating film.
2. Because the electrode potential of copper is more positive than the electrode potential of iron, copper ion is reduced and is deposited on the cutting ferrule joint surface by the bonderizing to increased surperficial cathode zone, further promoted the electrochemical reaction of bonderizing, accelerated the formation of bonderizing crystal nucleus, refined crystalline grain makes the phosphating coat compact, even, improves the bonderizing speed simultaneously, reduces the bonderizing temperature, finally makes the phosphating coat have the advantage that the film-forming is inseparable, adhesive force is strong.
3. During the phosphating process, ferric ions may be generated under the oxidation of individual components, thereby generating Fe (PO)4)3The sediment affects the phosphorization film forming speed and the film forming quality. The citric acid as the compounding agent can effectively complex ferric ions and reduce sediments. Meanwhile, the weak acidity of citric acid can increase active points on the surface of the organism and promote phosphorusThe initial formation of the crystallization nucleus plays a role in thinning the film layer, so that the phosphating film is more compact.
4.
In the process of phosphorization, the catalyst can play the roles of oxidizing agent, corrosion inhibitor, complexing agent and reducing the weight of the film layer. Because of the fact that
Can form various condensed polyacid ions by the condensation of oxygen polyhedron at the same point or edge, and the basic structural unit is octahedral MoO in the polyacid anion structure of molybdenum6When it is reacted with an orthophosphate salt,
regular tetrahedron is immediately MoO6Octahedral enclosure, i.e. filling of heteroatoms in the centre of the polyacid ion to form a heteropolyacid: phosphomolybdic acid (H)3PO4·12MoO3·30H2O). Coordinated MoO of molybdenum in phosphomolybdic acid3Much more active in the molecule than in free molybdic acid or normal molybdate; in a solution containing an inorganic acid, the phosphate reacts with the aforementioned phosphomolybdic acid to produce a salt of complex phosphomolybdic acid. Phosphomolybdates, in turn, have a strong oxidizing effect on many inorganic and organic compounds. The strong oxidation accelerates the anodic oxidation process of the surface of the ferrule joint, and the complex phosphomolybdate ions (heteropoly acid ions) can promote depolarization of the surface of the cathode, improve the density of micro-current, and partially seal the surface of the anode, so that the area ratio of the cathode to the anode is increased, and the phosphating speed is greatly accelerated. The heteropolyacid is adsorbed on the surface of the ferrule joint or embedded in the micropores of the phosphating film, so that a more compact arrangement is generated, and the quality of the phosphating film is improved.
5. Triethanolamine is a ligand with strong coordination ability, has four effective groups in the molecule, can form five-membered ring chelate with metal, and is insoluble in water and adsorbed in the surface layer of the phosphating film or the pores of the film. The triethanolamine is first neutralized by polar groups in the phosphating solutionHeart atom N and active H in solution+Coordinate to form onium ion, and physically adsorb on the surface of the ferrule or cathode region with negative charge to block H+Proximity to ferrule fitting surface to inhibit H+The reduction reaction of (2) and further carrying out comprehensive chemical adsorption on the Fe atoms or ions of the bayonet joint with central atoms of N and O with unshared electron pairs, and the charged onium ions adsorb the ions in the solution
And
thereby promoting the film formation and enhancing the corrosion resistance of the film, and further reacting with Fe (H)2PO4)2And Zn (H)2PO4)2And (3) generating a composite phosphate protective film with organic groups on the surface of the ferrule joint. In addition, the citric acid can enable the absorbed hydrocarbon chains with hydroxyl in triethanolamine molecules to be closer to the surface of the ferrule joint, so that a chelating insoluble film is formed to cover the original exposed part, and the absorption is more stable.
PTFE, namely polytetrafluoroethylene, has extremely low friction coefficient, has good lubricating and dispersing effects and improves the uniformity of a phosphating film. In addition, PTFE has good volatility, and the in-process of drying can continuously volatilize to constantly reduce the surface tension of bonderizing membrane here, make the bonderizing membrane compacter stable, also make the bonderizing membrane have better adhesive force and be difficult for droing on the cutting ferrule connects the surface simultaneously, make the bonderizing membrane can play long-time continuous guard action to the cutting ferrule connects.
Detailed Description
Example 1
The external thread cutting ferrule joint is characterized in that the outer surfaces of all parts of the external thread cutting ferrule joint are treated by phosphating solution to form phosphating films, and the phosphating solution comprises 220 parts by weight of phosphoric acid; 30 parts of zinc oxide; 17 parts of manganese carbonate; 24 parts of PTFE; 22 parts of triethanolamine; 1.6 parts of copper nitrate; 8 parts of citric acid; and 18 parts of sodium molybdate.
Wherein, the phosphating solution treatment comprises the following steps:
s1, surface treatment: removing oil and rust on the surface and washing;
s2, phosphating and coating: putting the mixture into a phosphating solution for phosphating;
s3, drying: heating and drying at 60-90 deg.C, washing with water, and naturally drying.
Example 2
The external thread cutting ferrule joint is characterized in that the outer surfaces of all parts of the external thread cutting ferrule joint are treated by phosphating solution to form phosphating films, and the phosphating solution comprises 220 parts by weight of phosphoric acid; 30 parts of zinc oxide; 17 parts of manganese carbonate; emulsifier OP-1024 parts; 22 parts of triethanolamine; 1.6 parts of copper nitrate; 8 parts of citric acid; 18 parts of sodium molybdate (compared with the example 1, the dispersing agent is replaced by PTFE by an emulsifier OP-10).
Wherein, the phosphating solution treatment comprises the following steps:
s1, surface treatment: removing oil and rust on the surface and washing;
s2, phosphating and coating: putting the mixture into a phosphating solution for phosphating;
s3, drying: heating and drying at 60-90 deg.C, washing with water, and naturally drying.
Example 3
The external thread cutting ferrule joint is characterized in that the outer surfaces of all parts of the external thread cutting ferrule joint are treated by phosphating solution to form phosphating films, and the phosphating solution comprises 220 parts by weight of phosphoric acid; 30 parts of zinc oxide; 17 parts of manganese carbonate; 24 parts of PTFE; 22 parts of sodium nitrite; 1.6 parts of copper nitrate; 8 parts of citric acid; 18 parts of sodium molybdate (compared with example 1, the accelerator is replaced by triethanolamine and sodium nitrite).
Wherein, the phosphating solution treatment comprises the following steps:
s1, surface treatment: removing oil and rust on the surface and washing;
s2, phosphating and coating: putting the mixture into a phosphating solution for phosphating;
s3, drying: heating and drying at 60-90 deg.C, washing with water, and naturally drying.
Performance detection
The adhesion test of the phosphating films was carried out according to GB 1720-79 paint film adhesion test, and the test results are shown in Table 1.
TABLE 1
| Example 1 | Example 2 | Example 3 | |
| Grade of adhesion | Level 1 | Stage 2 | Stage 2 |
| Film appearance | Uniform, fine and smooth | Uniform, fine and coarse | Is coarse and coarse |
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. An external screw thread cutting ferrule connects which characterized in that: the outer surfaces of all parts of the clamping sleeve head are treated by phosphating solution to form phosphating films, and the phosphating solution comprises the following components in parts by weight,
210 portions and 240 portions of phosphoric acid;
30-40 parts of zinc salt;
15-20 parts of manganese salt;
20-25 parts of a dispersing agent;
20-25 parts of an accelerator;
the zinc salt is zinc oxide.
2. The male threaded ferrule fitting of claim 1, wherein: the phosphating solution comprises 1-2 parts by weight of copper nitrate.
3. The male threaded ferrule fitting of claim 1, wherein: the phosphating solution comprises 7-10 parts by weight of citric acid.
4. The male threaded ferrule fitting of claim 2, wherein: the raw material comprises 15-20 parts by weight of sodium molybdate.
5. An externally threaded ferrule fitting according to claim 3, wherein: the accelerant adopts triethanolamine.
6. The male threaded ferrule fitting of claim 1, wherein: the dispersing agent adopts PTFE.
7. The male threaded ferrule fitting of claim 1, wherein: the phosphating solution treatment comprises the following steps of,
s1, surface treatment: removing oil and rust on the surface and washing;
s2, phosphating and coating: putting the mixture into a phosphating solution for phosphating;
s3, drying: heating, drying, washing and drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010358902.8A CN111394717A (en) | 2020-04-29 | 2020-04-29 | External thread cutting ferrule connects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010358902.8A CN111394717A (en) | 2020-04-29 | 2020-04-29 | External thread cutting ferrule connects |
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| Publication Number | Publication Date |
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| CN111394717A true CN111394717A (en) | 2020-07-10 |
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| CN202010358902.8A Pending CN111394717A (en) | 2020-04-29 | 2020-04-29 | External thread cutting ferrule connects |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5597465A (en) * | 1994-08-05 | 1997-01-28 | Novamax Itb S.R.L. | Acid aqueous phosphatic solution and process using same for phosphating metal surfaces |
| CN204114387U (en) * | 2014-09-11 | 2015-01-21 | 海盐县通达液压管件厂 | A kind of Bite type fittings |
| CN107099789A (en) * | 2016-02-19 | 2017-08-29 | 成都红宇时代科技有限公司 | A kind of iron and steel material quality normal-temperature phosphorizing liquid |
| CN109706440A (en) * | 2019-01-10 | 2019-05-03 | 温州疆昊汽车部件有限公司 | A kind of hinge for trunk of vehicle part and its production technology |
| CN109778161A (en) * | 2019-02-23 | 2019-05-21 | 浙江华锦建筑装饰设计有限公司 | A kind of antidetonation prefabricated buildings |
-
2020
- 2020-04-29 CN CN202010358902.8A patent/CN111394717A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5597465A (en) * | 1994-08-05 | 1997-01-28 | Novamax Itb S.R.L. | Acid aqueous phosphatic solution and process using same for phosphating metal surfaces |
| CN204114387U (en) * | 2014-09-11 | 2015-01-21 | 海盐县通达液压管件厂 | A kind of Bite type fittings |
| CN107099789A (en) * | 2016-02-19 | 2017-08-29 | 成都红宇时代科技有限公司 | A kind of iron and steel material quality normal-temperature phosphorizing liquid |
| CN109706440A (en) * | 2019-01-10 | 2019-05-03 | 温州疆昊汽车部件有限公司 | A kind of hinge for trunk of vehicle part and its production technology |
| CN109778161A (en) * | 2019-02-23 | 2019-05-21 | 浙江华锦建筑装饰设计有限公司 | A kind of antidetonation prefabricated buildings |
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