CN113913889B - Galvanized phosphating pipe joint and method for reducing surface roughness thereof - Google Patents
Galvanized phosphating pipe joint and method for reducing surface roughness thereof Download PDFInfo
- Publication number
- CN113913889B CN113913889B CN202111105120.4A CN202111105120A CN113913889B CN 113913889 B CN113913889 B CN 113913889B CN 202111105120 A CN202111105120 A CN 202111105120A CN 113913889 B CN113913889 B CN 113913889B
- Authority
- CN
- China
- Prior art keywords
- pipe joint
- phosphating
- treatment
- electroplating
- surface roughness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/04—Tubes; Rings; Hollow bodies
-
- 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
-
- 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
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
-
- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
- C23C28/3225—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only with at least one zinc-based layer
-
- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
-
- 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
- C23G1/08—Iron or steel
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/08—Coatings characterised by the materials used by metal
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrochemistry (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Electroplating Methods And Accessories (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention discloses a galvanized phosphating pipe joint and a method for reducing the surface roughness thereof, which mainly comprise acid washing, galvanization, phosphating and hydrophobic treatment, wherein an oxide layer on the surface of the pipe joint is removed through acid washing, the surface quality of the pipe joint is improved, the galvanization and phosphating treatment are used for forming a compact corrosion-resistant layer on the surface of the pipe joint, the corrosion resistance of a pipe joint part is improved, and finally, the surface roughness of the corrosion-resistant layer is regulated through hydrophobic treatment, so that the equipment is ensured to meet the working requirement of a hydraulic system; compared with the prior art, the method greatly reduces the damage of the pretreatment process to the pipe joint base material by the acid washing mode, reduces the surface roughness of the pipe joint base material and ensures the orderly growth of the corrosion-resistant layer; meanwhile, a wrapping layer is formed on the surface of the corrosion-resistant layer through the water repellent, so that pits on the surface of the corrosion-resistant layer are filled, and the roughness of the pipe joint is reduced; the technical scheme of the invention is simple, convenient to operate and has good popularization value and economic benefit.
Description
Technical Field
The invention relates to the technical field of surface treatment, in particular to a galvanized phosphating pipe joint and a method for reducing surface roughness of the galvanized phosphating pipe joint.
Background
The phosphating treatment is used as an important surface treatment mode, and the obtained phosphating film has excellent corrosion resistance, lubricating property and antifriction and wear-resisting effects, so that the phosphating film is widely applied to the surface of a pipe joint, however, the pipe joint is used as a connecting tool between pipelines in a hydraulic system, and has extremely high requirements on sealing performance. The surface roughness of the pipe joint is a key quality characteristic for ensuring the sealing connection of a pipeline system, the surface roughness is high, the fuel leakage of the connecting part of the pipe joint and a conduit is extremely easy to cause, the pipeline safety is seriously affected, the phosphating treatment is a process of forming a phosphate chemical conversion film through chemical reaction, and the micro process is a process of crystallizing the phosphate film, so that the surface roughness after phosphating is easily caused to be larger (the roughness of the pipe joint after electroplating phosphating is generally 2.6 mu m). Therefore, how to reduce the roughness of the pipe joint is a key to ensure that the galvanization phosphating process can be used for hydraulic system pipe joints.
Disclosure of Invention
Aiming at the defect of high surface roughness of the galvanized and phosphated pipe joint in the prior art, the invention discloses a galvanized and phosphated pipe joint and a method for reducing the surface roughness of the galvanized and phosphated pipe joint.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method of reducing the surface roughness of a galvanized phosphated pipe joint, comprising the steps of:
s1, pickling a pipe joint to be processed by adopting acid liquor;
s2, galvanization is carried out on the pipe joint treated in the step 1 in a non-impact electroplating mode;
s3, soaking the pipe joint subjected to the electroplating operation in the step S2 by adopting a high-temperature phosphate solution;
s4, soaking the pipe joint subjected to the phosphating treatment in the step S3 in a water repellent agent for hydrophobic treatment,
and S5, drying the pipe joint after the hydrophobic treatment is finished to obtain a finished pipe joint.
Optionally, the acid solution in the step S1 is hydrochloric acid solution, and the concentration of the acid solution is 100-150g/L.
Alternatively, in the non-impact plating mode, the current density is 1-2A/dm 2 The electroplating time is 10-30min, and the thickness of the plating layer is 12-18 mu m.
Alternatively, in the non-impact plating mode, the current density is 1A/dm 2 The electroplating time is 20min, and the thickness of the plating layer is 15 mu m.
Optionally, a dehydrogenation process is further included between the steps S3 and S4, and the concrete operation is that the pipe joint subjected to the phosphating treatment in the step S3 is placed in an oven at 190 ℃ for 8-9 hours, so that a semi-finished pipe joint is obtained;
the step S4 specifically includes: and immersing the semi-finished pipe joint in a water repellent agent to carry out water increasing treatment.
Optionally, the free acidity of the high-temperature phosphoric acid solution adopted in the step S3 is 12-14 points, the total acidity is 70-84 points, the temperature of the phosphoric acid solution is 92-93 ℃, and the phosphating time is 10-11min.
Optionally, the free acidity of the phosphoric acid solution is 13 points and the total acidity is 80 points; the temperature of the phosphoric acid solution is 92 ℃ and the time is 10min.
Optionally, the airing and drying treatment in the step S5 comprises natural airing and heating airing at room temperature, wherein the natural airing time is 30-50min, the heating airing temperature is 100-120 ℃, and the drying time is 80-100min.
Correspondingly, the invention also discloses a galvanized and phosphated pipe joint, which is obtained based on the method of any one of the above.
Compared with the prior art, the invention has the following beneficial effects:
1. the method mainly comprises acid washing, galvanizing, phosphating and hydrophobic treatment, wherein an oxide layer on the surface of the pipe joint is removed through acid washing, so that the surface quality of the pipe joint is improved, the galvanizing and phosphating treatment is used for forming a compact corrosion-resistant layer on the surface of the pipe joint, so that the corrosion resistance of the pipe joint part is improved, and finally, the surface roughness of the corrosion-resistant layer is regulated through the hydrophobic treatment, so that the equipment is ensured to meet the working requirement of a hydraulic system;
compared with the prior art, the method adopts acid washing as a main mode of pretreatment, the traditional process adopts sand blasting to remove oxide layer impurities on the surface, the sand blasting mainly drives alumina abrasive to form a high-speed beam by high-pressure compressed air, and then the oxide layer is stripped by the impact of the beam on the oxide layer, the biggest problem is that the structural strength of the oxide layer at different positions is different, the impact strength of the beam is changed slightly, so that a part of areas need to be impacted for multiple times, the stripping of the part of areas can be completed by one-time impact, and the area with poor structural strength inevitably has substrate damage on the premise of ensuring the stripping effect; therefore, the surface pits of the material after high-speed beam irradiation treatment are more, so that the surface roughness is overlarge, the uniform and orderly growth of the subsequent corrosion-resistant layer is influenced, and the surface roughness of a product is finally influenced;
compared with sand blasting, the pickling method mainly etches the oxide layer on the surface through chemical reaction, the reaction speed can be controlled by controlling the concentration of acid liquor, the treatment process is softer and controllable, meanwhile, as the whole pipe joint is immersed in the acid liquor, even if the pipe joint base layer is corroded, the whole pipe joint is corroded, the corrosion degree in all directions is not great, a large number of pits can be effectively prevented from being formed on the surface of the pipe joint, the roughness of the pipe joint after the surface treatment is smaller, thereby laying a good foundation for subsequent treatment, and finally reducing the surface roughness of the pipe joint;
meanwhile, zinc plating is carried out in a non-impact electroplating mode, smaller particle crystals can be obtained, and the growth speed of crystal nuclei is reduced by reducing electroplating current, so that two processes of crystal nuclei formation and crystal nuclei growth are simultaneously interfered, and the two processes are mutually matched, so that a zinc plating layer attached to the surface of a pipe joint in the electroplating process is finer and tighter, and the roughness of a final product is controlled;
and atIncreasing free H by increasing free acid concentration during phosphating 3 PO 4 The content of Fe is promoted to dissolve, more compact crystal nucleus is formed, and the surface roughness of the pipe joint is reduced;
the invention mainly adopts the water repellent for carrying out the water repellent treatment on the post-treatment of the pipe joint, when the pipe joint is soaked in the water repellent, the water repellent fills all holes on the surface of the pipe joint and penetrates into the pipe joint, so that an isolating layer is formed on the surface of the pipe joint, the surface of the isolating layer is smooth, and the rough phosphating layer of the pipe joint is covered by the isolating layer, so that the surface roughness of the pipe joint is greatly reduced.
Compared with the prior art, the invention not only can effectively reduce the surface roughness of the pipe joint, but also has simple process, convenient operation and better industrialized application prospect, and can effectively reduce the cost of the surface treatment of the pipe joint, thereby meeting the requirement of mass industrialized production.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for reducing roughness of a galvanized phosphorus pipe joint according to an embodiment of the invention;
FIG. 2 is a golden phase diagram of the pipe joint according to embodiment 1 of the present invention;
FIG. 3 is a golden phase diagram of the control group 1 pipe joint;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Embodiment 1
This embodiment, as a best mode of the present invention, discloses a method for reducing roughness of a galvanized pipe joint, and the technical scheme of the present invention is described in detail by using a 45A type pipe joint as a sample, and includes the following steps:
s1, immersing a pipe joint to be processed in 100g/L hydrochloric acid solution at room temperature for surface treatment until a surface oxide layer completely falls off;
s2, preparing electroplating liquid required by electroplating according to HB/Z5068, immersing the pipe joint with the surface treated in S1 into the electroplating liquid, and galvanizing the pipe joint in a non-impact electroplating mode, wherein the current density in the non-impact electroplating process is 1A/dm 2 The plating time was 20 minutes to form a 15 μm plating layer;
s3, preparing corresponding zinc salt phosphating solution according to HB/Z5080, wherein the free acidity of the zinc salt phosphating solution is 13 points, and the total acidity is 80 points; heating the zinc salt phosphating acid solution to 92 ℃ after the preparation, immersing the pipe joint subjected to the electroplating operation in the step S2 into the heated zinc salt phosphating solution for phosphating treatment, wherein the immersion time is 10min;
s4, placing the pipe joint subjected to the phosphating treatment in the step S3 into an oven with the temperature of 190 ℃ for 8-9 hours so as to finish the dehydrogenation operation;
s5, immersing the pipe joint subjected to the dehydrogenation operation in the step S4 in a BH102 water repellent for 6min; after the hydrophobic treatment is finished, the pipe joint is dried in a room temperature environment, the drying time is determined according to the temperature in the room temperature environment, and the drying time is 40 minutes;
and (3) placing the pipe joint after natural drying in an oven with the temperature of 110 ℃ for heating and drying for 90 minutes, and obtaining the pipe joint with the surface roughness meeting the requirement after the drying.
Embodiment 2
This embodiment, as a basic embodiment of the present invention, discloses a method for reducing roughness of a galvanized pipe joint, and the technical scheme of the present invention is described in detail by using a 45A type pipe joint as a sample, and includes the following steps:
s1, immersing a pipe joint to be processed in 150g/L hydrochloric acid solution at room temperature for surface treatment until a surface oxide layer completely falls off;
s2, preparing electroplating liquid required by electroplating according to HB/Z5068, immersing the pipe joint with the surface treated in S1 into the electroplating liquid, and galvanizing the pipe joint in a non-impact electroplating mode, wherein the current density in the non-impact electroplating process is 2A/dm 2 The plating time was 10 minutes to form a plating layer of 18 μm;
s3, preparing corresponding zinc salt phosphating solution according to HB/Z5080, wherein the free acidity of the zinc salt phosphating solution is 14 points, and the total acidity is 84 points; heating the zinc salt phosphating acid solution to 92 ℃ after the preparation, immersing the pipe joint subjected to the electroplating operation in the step S2 into the heated zinc salt phosphating solution for phosphating treatment, wherein the immersion time is 10min;
s4, placing the pipe joint subjected to the phosphating treatment in the step S3 into an oven with the temperature of 190 ℃ for 8-9 hours so as to finish the dehydrogenation operation;
s5, immersing the pipe joint subjected to the dehydrogenation operation in the step S4 in a BH102 water repellent for 5min; after the hydrophobic treatment is finished, the pipe joint is dried in a room temperature environment, the drying time is determined according to the temperature in the room temperature environment, and the drying time is 30min;
and (3) placing the pipe joint after natural drying in an oven with the temperature of 110 ℃ for heating and drying for 90 minutes, and obtaining the pipe joint with the surface roughness meeting the requirement after the drying.
Embodiment 3
This embodiment, as another basic embodiment of the present invention, discloses a method for reducing roughness of a galvanized pipe joint, and the technical solution of the present invention is described in detail using a 45A type pipe joint as a sample, including the following steps:
s1, immersing a pipe joint to be processed in 125g/L hydrochloric acid solution at room temperature for surface treatment until a surface oxide layer completely falls off;
s2, pressPreparing a plating solution required for plating according to HB/Z5068, immersing the pipe joint subjected to the surface treatment in S1 into the plating solution, and galvanizing the pipe joint in a non-impact plating manner, wherein the current density in the non-impact plating process is 1A/dm 2 The plating time was 30 minutes to form a plating layer of 18 μm;
s3, preparing corresponding zinc salt phosphating solution according to HB/Z5080, wherein the free acidity of the zinc salt phosphating solution is 13 points, and the total acidity is 77 points; heating the zinc salt phosphating acid solution to 93 ℃ after the preparation, immersing the pipe joint subjected to the electroplating operation in the step S2 into the heated zinc salt phosphating solution for phosphating treatment, wherein the immersion time is 10min;
s4, placing the pipe joint subjected to the phosphating treatment in the step S3 into an oven with the temperature of 190 ℃ for 8-9 hours so as to finish the dehydrogenation operation;
s5, immersing the pipe joint subjected to the dehydrogenation operation in the step S4 in a BH102 water repellent for 7min; after the hydrophobic treatment is finished, the pipe joint is dried in a room temperature environment, the drying time is determined according to the temperature in the room temperature environment, and the drying time is 50min;
and (3) placing the pipe joint after natural drying in an oven with the temperature of 110 ℃ for heating and drying for 90 minutes, and obtaining the pipe joint with the surface roughness meeting the requirement after the drying.
On one hand, the method can accelerate the quick drying of the hydrophobic layer and improve the production efficiency of the product by natural airing and heating drying; on the other hand avoids flowing because of gravity leads to liquid hydrophobic layer emergence at quick drying's in-process, and then causes hydrophobic layer uneven distribution, improves hydrophobic layer thickness's homogeneity, improves hydrophobic layer's protection effect.
The free acidity of the high-temperature phosphoric acid solution selected in the phosphating process is 12-14 points, the total acidity is 70-84 points, the temperature of the phosphoric acid solution is 92-93 ℃, and the phosphating time is 10-11min; the present invention increases free H by increasing the concentration of free acid as compared to prior art phosphoric acid solutions 3 PO 4 To promote the dissolution of Fe, thereby formingForming more compact crystal nucleus, thereby reducing the surface roughness of the pipe joint;
meanwhile, when the lower temperature limit and the lower time limit are adopted for phosphating, the growth rate of the phosphating film can be effectively reduced, grains of the phosphating film are finer, and the roughness of the phosphating film is reduced.
In order to better embody the technical effect of the method in reducing the surface roughness of the pipe joint, the inventor sets 3 groups of control tests based on univariate factors, wherein the pipe joint treatment process of the control test 1 comprises the following steps:
adopting a sand blowing process to carry out surface treatment on the pipe joint;
immersing the pipe joint in a zinc plating solution, and adopting non-impact electroplating, wherein the current density is 3A/dm 2 Electroplating time is 30min;
immersing the electroplated pipe joint in zinc salt phosphoric acid solution for 17min for phosphating, wherein the free acidity of the zinc salt phosphating solution is 13 points, the total acidity is 80 points, and the solution temperature is 92 ℃;
placing the pipe joint subjected to phosphating treatment in an oven at 190 ℃ for 8-9h;
immersing the pipe joint subjected to the dehydrogenation operation in BH102 water repellent for 6min; after the hydrophobic treatment is finished, the pipe joint is dried for 40min at room temperature and then dried for 90min at 110 ℃.
The pipe joint treatment process of the control test 2 comprises the following steps:
immersing the pipe joint to be processed in 150g/L hydrochloric acid solution at room temperature for surface treatment until the surface oxide layer is completely removed;
immersing the pipe joint in a zinc plating solution, and adopting non-impact electroplating, wherein the current density is 3A/dm 2 Electroplating time is 30min;
immersing the electroplated pipe joint in zinc salt phosphoric acid solution for 17min for phosphating, wherein the free acidity of the zinc salt phosphating solution is 13 points, the total acidity is 80 points, and the solution temperature is 92 ℃;
the pipe joint after the phosphating treatment is placed in an oven at 190 ℃ for 8-9h.
The pipe joint treatment process of the control test 3 comprises the following steps:
adopting a sand blowing process to carry out surface treatment on the pipe joint;
immersing the pipe joint in a zinc plating solution, and adopting non-impact electroplating, wherein the current density is 3A/dm 2 Electroplating time is 30min;
immersing the electroplated pipe joint in zinc salt phosphoric acid solution for 17min for phosphating, wherein the free acidity of the zinc salt phosphating solution is 13 points, the total acidity is 80 points, and the solution temperature is 92 ℃;
the pipe joint after the phosphating treatment is placed in an oven at 190 ℃ for 8-9h.
For the samples obtained in the above embodiments 1 to 3 and the control test, the following test data were obtained by detecting the surface roughness by the same method:
as can be seen from the test data, the surface roughness of the pipe joint subjected to pretreatment and water repellent treatment by acid washing is obviously reduced, and the technical effect of the water repellent treatment on roughness reduction is better than that of acid washing in comparison test
Secondly, as shown in fig. 2 and 3, the invention discloses the golden phase diagrams of the embodiment 1 and the control experiment 1, and as is obvious from the diagrams, the surface roughness of the pipe joint treated by the method is obviously reduced; the surface roughness of the part can be effectively improved.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.
Claims (5)
1. A method for reducing the surface roughness of a galvanized phosphated pipe joint, comprising the steps of:
s1, immersing a pipe joint to be processed in 100-150g/L hydrochloric acid solution for surface treatment until a surface oxide layer is completely removed;
s2, preparing electroplating liquid required by electroplating according to HB/Z5068, immersing the pipe joint with the surface treated in S1 into the electroplating liquid, and galvanizing the pipe joint in a non-impact electroplating mode, wherein the current density in the non-impact electroplating process is 1-2A/dm 2 The electroplating time is 10-30min, and the thickness of the electroplated layer is 12-18 mu m;
s3, preparing corresponding zinc salt phosphating solution according to HB/Z5080, wherein the free acidity of the zinc salt phosphating solution is 12-14 points, and the total acidity is 70-84 points; heating the zinc salt phosphating acid solution to 92-93 ℃ after the preparation, immersing the pipe joint subjected to the electroplating operation in the step S2 into the heated zinc salt phosphating acid solution for phosphating treatment, wherein the immersion time is 10-11min;
s4, soaking the pipe joint subjected to the phosphating treatment in the step S3 in a water repellent agent for hydrophobic treatment; the water repellent is BH102 water repellent, and the time of water repellent treatment is 5-7min;
and S5, drying the pipe joint after the hydrophobic treatment is finished to obtain a finished pipe joint.
2. A method for reducing the surface roughness of a galvanized pipe joint as set forth in claim 1, wherein: the current density in the non-impact electroplating process is 1A/dm 2 The plating time was 20 minutes, and the thickness of the plating layer was 15. Mu.m.
3. A method for reducing the surface roughness of a galvanized pipe joint as set forth in claim 1, wherein: the method comprises the steps of S3 and S4, wherein a dehydrogenation process is further included, and the concrete operation is that the pipe joint subjected to phosphating treatment in the step S3 is placed in an oven at 190 ℃ for 8-9 hours, so that a semi-finished pipe joint is obtained;
the step S4 specifically comprises the following steps: and immersing the semi-finished pipe joint in a water repellent agent to perform water repellent treatment.
4. A method for reducing the surface roughness of a galvanized pipe joint as set forth in claim 1, wherein: the free acidity of the zinc salt phosphating acid solution is 13 points, and the total acidity is 80 points; and (2) heating the zinc salt phosphating acid solution to 92 ℃ after the zinc salt phosphating acid solution is prepared, immersing the pipe joint subjected to the electroplating operation in the step (S2) in the heated zinc salt phosphating acid solution for phosphating treatment, wherein the immersion time is 10min.
5. A method for reducing the surface roughness of a galvanized pipe joint as set forth in claim 1, wherein: the drying treatment comprises natural drying at room temperature and heating drying, wherein the natural drying time is 30-50min, the heating drying temperature is 100-120 ℃, and the drying time is 80-100min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111105120.4A CN113913889B (en) | 2021-09-22 | 2021-09-22 | Galvanized phosphating pipe joint and method for reducing surface roughness thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111105120.4A CN113913889B (en) | 2021-09-22 | 2021-09-22 | Galvanized phosphating pipe joint and method for reducing surface roughness thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113913889A CN113913889A (en) | 2022-01-11 |
| CN113913889B true CN113913889B (en) | 2023-05-09 |
Family
ID=79235408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111105120.4A Active CN113913889B (en) | 2021-09-22 | 2021-09-22 | Galvanized phosphating pipe joint and method for reducing surface roughness thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113913889B (en) |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1159851A (en) * | 1994-10-04 | 1997-09-17 | 新日本制铁株式会社 | Steel pipe joint having high galling resistance and surface treatment method thereof |
| JPH08233163A (en) * | 1995-03-02 | 1996-09-10 | Nippon Steel Corp | Screw joint excellent in seizure resistance with no lubricant applied |
| JP3056646B2 (en) * | 1994-10-04 | 2000-06-26 | 新日本製鐵株式会社 | Surface treatment method for steel pipe joints with excellent galling resistance |
| JP3463659B2 (en) * | 2000-03-10 | 2003-11-05 | 住友金属工業株式会社 | Steel treatment method |
| JP2002364786A (en) * | 2001-06-05 | 2002-12-18 | Sumitomo Metal Ind Ltd | Film-forming method for threaded joint for oil well pipe and threaded joint product for oil well pipe |
| JP3876656B2 (en) * | 2001-07-13 | 2007-02-07 | 住友金属工業株式会社 | Threaded joints for pipes |
| US8322754B2 (en) * | 2006-12-01 | 2012-12-04 | Tenaris Connections Limited | Nanocomposite coatings for threaded connections |
| CN101413121A (en) * | 2007-10-19 | 2009-04-22 | 周辉友 | Galvanizing layer phosphatization and chromium-free passivation combined metal surface treatment process |
| UA112576C2 (en) * | 2012-06-07 | 2016-09-26 | Ніппон Стіл Енд Сумітомо Метал Корпорейшн | RIVER CONNECTION FOR STEEL PIPE |
| AR107043A1 (en) * | 2015-12-25 | 2018-03-14 | Nippon Steel & Sumitomo Metal Corp | THREADED CONNECTION FOR PIPE OR PIPE AND METHOD TO PRODUCE THE THREADED CONNECTION FOR PIPE OR TUBE |
| CN110846648A (en) * | 2019-11-22 | 2020-02-28 | 中国航发西安动力控制科技有限公司 | High-temperature manganese-zinc series phosphating solution and phosphating process |
| CN111020653A (en) * | 2019-12-13 | 2020-04-17 | 浙江东禾机械科技股份有限公司 | Surface treatment process for high-strength corrosion-resistant fastener |
-
2021
- 2021-09-22 CN CN202111105120.4A patent/CN113913889B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113913889A (en) | 2022-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102936455B (en) | Neodymium iron boron rare earth permanent magnet surface anti-corrosion coating and preparation method thereof | |
| CN105386000B (en) | The surface treatment method and its product of Nd-Fe-B permanent magnet material | |
| CN101226800B (en) | Surface treating method for sintering type Nd iron boron permanent magnetic material | |
| JPS6123272B2 (en) | ||
| CN101660153A (en) | Surface pretreatment agent before metal coating and preparation method and use method thereof | |
| CN113913889B (en) | Galvanized phosphating pipe joint and method for reducing surface roughness thereof | |
| CN101748407A (en) | Preparation method of surface composite coating of Tb-Dy-Fe magnetostrictive material | |
| CN105506605A (en) | Weather-resistant steel rust layer stabilizing treatment fluid | |
| CN103849914B (en) | Method for plating copper on titanium alloy coupling | |
| CN101235522B (en) | Method for preparing carbon fiber surface zinc coat | |
| CN112226751B (en) | Plating assistant liquid and hot galvanizing process using same | |
| CN108707933A (en) | The galvanizing flux and preparation method thereof of super-hydrophobic zinc-plated carbon steel | |
| CN111005045A (en) | Preparation method of titanium and titanium alloy surface coating | |
| CN104846383B (en) | A kind of production method of automobile power-assisted steering pump valve element | |
| CN103643270B (en) | A kind of production technique of vulcanization member | |
| CN114481012B (en) | Multielement alloy co-permeation agent for steel member and corrosion prevention process thereof | |
| CN112725811B (en) | Big flat-head screw and processing method thereof | |
| CN107164751A (en) | A kind of steel surface antirust agent combination product and its application | |
| CN107267975A (en) | A kind of method for improving common iron rustless property | |
| CN112695331A (en) | Screw with head and tail drilled and processing method thereof | |
| CN109207987B (en) | Mechanical galvanized carbon steel clamping and pressing type pipe fitting and preparation process thereof | |
| CN114453225A (en) | Dacromet coating method for anti-loose fastener | |
| CN108221016B (en) | A kind of zinc-plated sealer and its application method | |
| CN112481678A (en) | Automobile pretreatment electrophoresis process simultaneously suitable for multiple plates | |
| CN112391100A (en) | Preparation method of water-based paint for improving surface performance of pig iron casting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |