CN114921783A - Processing method for phosphorization of fastening bolt of reactor pressure vessel - Google Patents
Processing method for phosphorization of fastening bolt of reactor pressure vessel Download PDFInfo
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- CN114921783A CN114921783A CN202210596473.7A CN202210596473A CN114921783A CN 114921783 A CN114921783 A CN 114921783A CN 202210596473 A CN202210596473 A CN 202210596473A CN 114921783 A CN114921783 A CN 114921783A
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- fastening bolt
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- 238000003672 processing method Methods 0.000 title claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000005406 washing Methods 0.000 claims abstract description 31
- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 230000003213 activating effect Effects 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 12
- 230000003750 conditioning effect Effects 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 238000011282 treatment Methods 0.000 claims description 68
- 239000007788 liquid Substances 0.000 claims description 16
- 238000002161 passivation Methods 0.000 claims description 15
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 10
- 230000004913 activation Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
- 150000002696 manganese Chemical class 0.000 claims description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 abstract description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract description 9
- 239000010452 phosphate Substances 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 2
- 239000011780 sodium chloride Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 8
- 238000005238 degreasing Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005237 degreasing agent Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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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
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention provides a processing method for phosphorization of a fastening bolt of a reactor pressure vessel, which comprises the following steps: hanging, deoiling and washing, activating and washing, surface conditioning, phosphating and washing, passivating and washing and drying. The invention supports the fastening bolt by adopting the supporting mechanism with the rolling top, so that the whole phosphating process is simple and easy to operate, and the fastening bolt rotates on the roller of the supporting mechanism for multiple times during phosphating to change a supporting point, so that a supporting point is prevented from being provided with a phosphate film (without bare points), and meanwhile, an inner hole of the fastening bolt is obliquely arranged relative to a horizontal plane, so that the condition that the thickness of the phosphate film on the surface of the inner hole is inconsistent or bare points are generated due to the generation of an air zone in the inner hole can be effectively avoided; after the phosphating film is passivated, the surface of the fastening bolt has no bare spot, the corrosion resistance (no corrosion after being soaked in 3 percent saline water for 2 hours) is qualified, the adhesive force is qualified, and all the performances meet the technical requirements of nuclear power.
Description
Technical Field
The invention relates to the technical field of surface phosphating treatment, in particular to a method for phosphating fastening bolts of a reactor pressure vessel.
Background
The steel parts are processed and chemically treated in phosphate solution containing manganese, iron and zinc, and a layer of phosphate protective film which is insoluble in water is generated on the surface of the steel parts, and the chemical treatment process is phosphorization. The mechanical properties of the parts subjected to phosphating treatment are basically kept unchanged. In the phosphating treatment process, along with the dissolution of iron ions, the thickness of the generated phosphating film can reach 5-20 mu m, but the size change of parts is small. The treated phosphatized film has high corrosion resistance and excellent lubricating effect, and may be used widely in automobile, ship, weapon, aeronautics and astronautics industry. When the reactor pressure vessel fastening bolt is subjected to phosphating treatment, the requirement on a phosphating film is high, the phosphating film is required to be complete and uniform and cannot have bare spots, and meanwhile, the corrosion resistance and the adhesive force are required and all need to reach relevant standards of nuclear power.
Chinese patent with publication number CN 108034938B discloses a method for phosphating bolts of nuclear power equipment and phosphating solution, wherein the method sequentially performs the following treatments on the bolts: the method comprises the following steps of oil removal, water washing, acid washing, surface conditioning, pre-phosphorization, water washing, acid washing, surface conditioning, phosphorization, passivation, water washing and drying, but the applicant finds that when the method is used for phosphorizing fastening bolts with heavy dead weight, particularly fastening bolts of reactor pressure vessels (the dead weight of the fastening bolts reaches 300 kg), the following defects still exist:
because the fastening bolt is heavy in weight, when the fastening bolt is placed in a treatment tank for treatment, the fastening bolt is directly soaked in a treatment tank by using a treating agent and water, the fastening bolt is basically not moved or rotated before the treatment, the bottom supporting point of the fastening bolt is always kept in contact with the treatment tank, and the treating agent is difficult to effectively treat the bottom supporting point of the fastening bolt, so that bare spots are easily generated at the contact part.
In addition, the middle part of the fastening bolt is provided with an inner hole along the length direction, if the fastening bolt is directly horizontally placed in a treatment tank for treatment according to a conventional processing mode, the central line of the inner hole is in a state parallel to the horizontal plane, and due to bubbles generated during phosphorization inside the inner hole, the bubbles are difficult to rapidly escape, so that an air belt is formed in the inner hole, and the thickness of a phosphorization film on the surface of the inner hole is inconsistent or bare spots are generated.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for phosphating a fastening bolt of a reactor pressure vessel, which can effectively avoid bare spots on the surface of the fastening bolt and ensure consistent thickness of the phosphating film on the surface of the fastening bolt.
The purpose of the invention is realized by the following technical scheme:
a processing method for phosphorization of a fastening bolt of a reactor pressure vessel comprises the following steps:
s1, mounting and hanging: a supporting mechanism is placed in a preset treatment tank, and then a fastening bolt with an inner hole in the middle is rotatably placed transversely on the supporting mechanism. The treatment tank is a groove-shaped tank body with a drain pipe at the bottom, a valve is arranged on the drain pipe, and when the tank is washed with water, the valve is opened to empty liquid, and then water is added to wash the fastening bolt; the supporting mechanism comprises a supporting frame and two rows of roller groups; the support frame is arranged in the treatment tank; the two rows of roller groups are arranged on the support frame along the length direction of the fastening bolt, each row of roller group at least comprises one roller, the wheel axle of each roller is rotatably arranged on the support frame through the support, and the wheel axle of each roller is also arranged along the length direction of the fastening bolt; the fastening bolt can be rotatably placed between the two rows of roller groups and is in contact with the rollers.
S2, oil removal: and pouring the degreasing fluid into a treatment tank to immerse the fastening bolt, performing degreasing treatment on the fastening bolt, and washing after degreasing.
S3, activation: and pouring the activating solution into a treatment tank, immersing the fastening bolts in the activating solution, activating the fastening bolts, and washing with water after activation.
S4, surface adjustment; pouring the surface conditioning liquid into a treatment tank, immersing the fastening bolt, and performing surface conditioning treatment on the fastening bolt;
s5, phosphorization; pouring the phosphating solution into a treatment tank to immerse the fastening bolt, performing phosphating treatment on the fastening bolt, and washing with water after phosphating; after the phosphating solution is poured, the fastening bolt is periodically rotated for many times, and the central line of the inner hole of the fastening bolt is always kept to be inclined relative to the horizontal plane in the whole phosphating process.
S6, passivating; and pouring the passivation solution into a treatment tank to immerse the fastening bolt, passivating the fastening bolt, and washing with water after passivation.
S7, drying: and drying or baking the water on the surface of the fastening bolt.
The invention supports the fastening bolt by adopting the supporting mechanism with the rolling top, so that the whole phosphating process is simple and easy to operate, and the fastening bolt rotates on the roller of the supporting mechanism for multiple times during phosphating to change a supporting point, so that a supporting point is prevented from being provided with a phosphate film (without bare points), and meanwhile, an inner hole of the fastening bolt is obliquely arranged relative to a horizontal plane, so that the condition that the thickness of the phosphate film on the surface of the inner hole is inconsistent or bare points are generated due to the generation of an air zone in the inner hole can be effectively avoided; after the phosphating film is passivated, the surface of the fastening bolt has no bare spot, the corrosion resistance (no corrosion after being soaked in 3 percent saline water for 2 hours) is qualified, the adhesive force is qualified, and all the performances meet the technical requirements of nuclear power.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a front view of the support mechanism of the present invention;
FIG. 2 is a left side view of the support mechanism of the present invention;
shown in the figure: 1-supporting frame, 2-fastening bolt, 3-roller, 4-bracket and 5-inner hole.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described in the specification are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be regarded as the scope of the present invention without substantial changes in the technical contents.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
a processing method for phosphorization of a fastening bolt of a reactor pressure vessel comprises the following steps:
s1, mounting and hanging: placing a supporting mechanism in a preset treatment tank, and then rotatably placing a fastening bolt 2 with an inner hole 5 in the middle on the supporting mechanism; the treatment tank is a groove-shaped tank body with a drain pipe at the bottom, a valve is arranged on the drain pipe, and when the treatment tank is washed with water, the valve is opened to empty the liquid in the treatment tank, and then water is added to wash the fastening bolt 2; as shown in fig. 1 and 2, the supporting mechanism includes a supporting frame 1 and two rows of roller sets; the support frame 1 is arranged in a treatment tank (a plate-shaped or clip-shaped structure); the two rows of roller groups are arranged on the support frame 1 along the length direction of the fastening bolt 2 (or along the treatment groove), each row of roller group at least comprises one roller 3, the wheel shaft of each roller 3 is rotatably arranged on the support frame 1 through the support 4, the wheel shaft of each roller 3 is also arranged along the length direction of the fastening bolt 2, each row of roller group comprises two rollers 3, and the two rollers 3 are respectively supported on two sides of the fastening bolt 2 in a rolling way; the fastening bolt 2 is rotatably placed between the two rows of roller groups and is in contact with the rollers 3.
S2, oil removal: and pouring the deoiling liquid into the treatment tank to immerse the fastening bolt 2, performing deoiling treatment on the fastening bolt 2, and washing after deoiling. The degreasing liquid is selected from common alkaline degreasing agents, such as sodium hydroxide solution. After the oil removal treatment is completed, the valve of the drain pipe at the bottom of the treatment tank is opened, the oil removal liquid is emptied, then the fastening bolt 2 is washed, and after the washing is completed and the water in the treatment tank is emptied, the valve of the drain pipe at the bottom of the treatment tank is closed.
S3, activating: pouring the activating solution into a treatment tank, and immersing the fastening bolt 2; the fastening bolt 2 was subjected to an activation (acid washing) treatment for 8 minutes at room temperature, and the activation solution was a sulfuric acid solution having a concentration of 50ml/L, prepared with water. And (3) washing after activation, opening a valve of a drain pipe at the bottom of the treatment tank during washing, emptying liquid in the treatment tank, washing the fastening bolt 2, emptying water in the treatment tank after washing, and closing the valve of the drain pipe at the bottom of the treatment tank.
S4, surface adjustment; pouring the surface conditioning liquid into a treatment tank, immersing the fastening bolt 2, and performing surface conditioning treatment on the fastening bolt 2 for 4 minutes at room temperature; the surface adjusting liquid with the concentration of 50g/L is prepared by water.
S5, phosphorizing; pouring the phosphating solution into a treatment tank to immerse the fastening bolt 2, and performing phosphating treatment on the fastening bolt 2; after 3 minutes of pouring the phosphating solution, rotating the fastening bolt 2 once, and then rotating the fastening bolt 2 once again after 2 minutes (because the fastening bolt 2 is supported by the roller 3, the fastening bolt 2 can be easily rotated), and in the whole phosphating process, always keeping the central line of the inner hole 5 of the fastening bolt 2 to be inclined relative to the horizontal plane, wherein the included angle between the central line of the inner hole 5 of the fastening bolt 2 or the groove bottom of the groove and the horizontal plane is 15 degrees; the phosphating solution is manganese series phosphating solution, the free acidity of the manganese series phosphating solution is 6 points, and the total acidity of the manganese series phosphating solution is 50 points; the phosphating temperature of the phosphating solution to the fastening bolt is 86 ℃, and the phosphating time is 17 minutes. Carry out the washing after the bonderizing, open the valve of treatment tank bottom drain pipe during washing, the interior liquid of evacuation treatment tank, then carry out the washing to fastening bolt 2, after the washing is accomplished, the valve of the treatment tank bottom drain pipe is closed to the processing tank water of emptying.
S6, passivating; pouring the passivation solution into the treatment tank to immerse the fastening bolts 2, and passivating the fastening bolts; the passivating solution is chromic anhydride, the concentration of which is 0.4g/L, the chromic anhydride is prepared by water, and the PH value is adjusted to be 3 by phosphoric acid; the passivation temperature of the passivation solution for passivating the fastening bolt 2 is 55 ℃, and the passivation time is 1 minute. And after the passivation, the water washing is carried out, the valve of the drain pipe at the bottom of the treatment tank is opened during the water washing, the liquid in the treatment tank is emptied, then the fastening bolt 2 is washed, and after the water washing is finished, the water in the treatment tank is emptied, and the valve of the drain pipe at the bottom of the treatment tank is closed.
S7, drying: and drying or baking the moisture on the surface of the fastening bolt 2.
Example 2:
this example differs from example 1 in that:
the method described in example 1 can also be used for machining a fastening bolt 1 provided with grooves on the sides. The fastening bolt 1 is transversely placed on the roller 2 of the supporting mechanism, the groove is transversely arranged on the side wall of the fastening bolt 1, and an included angle of 15 degrees exists between the bottom of the groove and the horizontal plane.
Control experiment:
two fastening bolts with inner holes are selected as test objects, wherein one is used as a control group, and the other is used as a test group.
(1) Sample processing
The control group was treated in sequence in accordance with the treatment methods of steps S2 to S7 of example 1, but in step S5, the fastening bolts were not rotated, and the inner holes of the fastening bolts had an angle of 0 to 5 degrees with respect to the horizontal plane, and in the whole process, the fastening bolts were directly placed in the treatment tank without using a support mechanism for support.
The test group was sequentially processed completely in accordance with steps S1 to S7 of example 1, the whole process was carried out with the fastening bolt supported by the supporting mechanism and placed in the processing bath, and in the S5 phosphating step, the fastening bolt 2 was turned once after 3 minutes of pouring of the phosphating solution, and then the fastening bolt 2 was turned once after 2 minutes, and the center line of the bore 5 in the fastening bolt 2 was always kept inclined with respect to the horizontal plane during the whole phosphating process. After the treatment was completed, the thickness of the phosphate film was measured at five points in the longitudinal direction of the bolt.
(2) And (3) detecting the thickness of the plating layer:
sample preparation: control group, test group;
the test method comprises the following steps: GB/T6462-2005;
ambient temperature/humidity: 22 ℃/70 percent;
the device name: leica optical microscope
The experimental method comprises the following steps: and (3) sequentially selecting 5 points along the length direction of the fastening bolt (marking the selected points, taking the points in the same straight line in a spiral selection mode, and not selecting bare points), and measuring the thickness of the phosphating film.
Deviation of the specified procedure: 0.7 μm
The results are shown in Table 1:
TABLE 1
As can be seen from Table 1, the control group and the test group have uniform surface thickness, small deviation and smooth surface, but the test group is slightly superior to the control group in terms of overall flatness and uniformity of the phosphating films.
(3) Appearance inspection
Sample preparation: control group, test group;
the test method comprises the following steps: visual inspection;
the experimental results are shown in table 2:
TABLE 2
As can be seen from Table 2, the control group of the phosphate coatings had very obvious bare spots through appearance detection, while the test group of the phosphate coatings had uniform, complete, compact and no bare spots.
Other parts of the invention not described in detail are conventional techniques known to those skilled in the art.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The scope of the present invention is not limited to the technical solutions disclosed in the embodiments, and any modifications, equivalent substitutions, improvements, etc. made to the above embodiments according to the technical spirit of the present invention fall within the scope of the present invention.
Claims (10)
1. A processing method for phosphorization of a fastening bolt of a reactor pressure vessel is characterized by comprising the following steps:
s1, mounting and hanging: placing a supporting mechanism in a preset treatment tank, and then rotatably and transversely placing a fastening bolt with an inner hole in the middle on the supporting mechanism;
s2, oil removal: pouring the deoiling liquid into a treatment tank, immersing the fastening bolt, performing deoiling treatment on the fastening bolt, and washing after deoiling;
s3, activating: pouring the activating solution into a treatment tank, immersing the fastening bolts in the activating solution, activating the fastening bolts, and washing with water after activation;
s4, surface adjustment; pouring the surface conditioning liquid into a treatment tank, immersing the fastening bolt, and performing surface conditioning treatment on the fastening bolt;
s5, phosphorizing; pouring the phosphating solution into a treatment tank to immerse the fastening bolt, performing phosphating treatment on the fastening bolt, and washing with water after phosphating; after the phosphating solution is poured in, the fastening bolt is periodically rotated for many times, and the central line of the inner hole of the fastening bolt is always kept to be inclined relative to the horizontal plane in the whole phosphating process;
s6, passivating; pouring the passivation solution into a treatment tank, immersing the fastening bolts in the passivation solution, passivating the fastening bolts, and washing with water after passivation;
s7, drying: and drying or baking the water on the surface of the fastening bolt.
2. The method for phosphorizing the fastening bolt of the reactor pressure vessel according to claim 1, characterized in that: the included angle between the center line of the inner hole of the fastening bolt and the horizontal plane is 10-25 degrees.
3. The method for processing the phosphorization of the fastening bolt of the reactor pressure vessel according to claim 2, characterized in that: the included angle between the center line of the inner hole of the fastening bolt and the horizontal plane is 15 degrees.
4. The method for phosphorizing the fastening bolt of the reactor pressure vessel according to claim 1, characterized in that: step S3, the activating solution is sulfuric acid solution, the concentration of which is 50ml/L, and the activating solution is prepared by water; the activation time of the activating solution on the fastening bolt is 5-10 minutes at room temperature.
5. The method for phosphorizing the fastening bolt of the reactor pressure vessel according to claim 1, characterized in that: step S4, preparing the surface adjusting liquid with the concentration of 50g/L by using water; and the surface adjusting time of the surface adjusting liquid to the fastening bolt is 3-5 minutes at room temperature.
6. The method for processing the phosphorization of the fastening bolt of the reactor pressure vessel according to claim 1, characterized in that: step S5, the phosphating solution is a manganese series phosphating solution, the free acidity of the manganese series phosphating solution is 5-7 points, and the total acidity is 40-60 points; the phosphating temperature of the phosphating solution to the fastening bolt is 85-90 ℃, and the phosphating time is 10-20 minutes.
7. The method for phosphorizing the fastening bolt of the reactor pressure vessel according to claim 1, characterized in that: in step S5, the fastening bolt was turned once after 3 minutes from the pouring of the phosphating solution, and then turned again 2 minutes later.
8. The method for phosphorizing the fastening bolt of the reactor pressure vessel according to claim 1, characterized in that: step S6, the passivation solution is chromic anhydride, the concentration of the chromic anhydride is 0.3-0.45 g/L, the chromic anhydride is prepared by water, and the PH value is adjusted to 2-4 by phosphoric acid; the passivation temperature of the passivation solution on the fastening bolt is 50-70 ℃, and the passivation time is 0.5-1 minute.
9. The method for phosphorizing the fastening bolt of the reactor pressure vessel according to any one of claims 1-8, characterized in that: the treatment tank is a groove-shaped tank body with a drain pipe at the bottom, a valve is arranged on the drain pipe, and when the tank is washed with water, the valve is opened to empty liquid, and then water is added to wash the fastening bolt; the supporting mechanism comprises a supporting frame and two rows of roller groups; the support frame is arranged in the treatment tank; the two rows of roller groups are arranged on the support frame along the length direction of the fastening bolt, each row of roller group at least comprises one roller, the wheel axle of each roller is rotatably arranged on the support frame through the support frame, and the wheel axle of each roller is also arranged along the length direction of the fastening bolt; the fastening bolt is rotatably arranged between the two rows of roller groups and is contacted with the rollers.
10. The method for phosphorizing the fastening bolt of reactor pressure vessel according to claim 9, characterized in that: each row of roller groups comprises two rollers which are respectively supported on two sides of the fastening bolt in a rolling way.
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| CN202210596473.7A CN114921783A (en) | 2022-05-30 | 2022-05-30 | Processing method for phosphorization of fastening bolt of reactor pressure vessel |
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| CN202210596473.7A CN114921783A (en) | 2022-05-30 | 2022-05-30 | Processing method for phosphorization of fastening bolt of reactor pressure vessel |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206376004U (en) * | 2016-12-28 | 2017-08-04 | 上海天合石油工程股份有限公司 | A kind of thermal phosphorization device of petroleum drilling and mining instrument |
| CN211645384U (en) * | 2019-12-25 | 2020-10-09 | 晋西工业集团有限责任公司 | A hanger for cylindric part bonderizing |
| CN112359353A (en) * | 2020-10-26 | 2021-02-12 | 山东贞元汽车车轮有限公司 | Phosphating liquid supply system and phosphating treatment process for surface of steel ring wheel |
| CN112535883A (en) * | 2020-11-07 | 2021-03-23 | 徐州欧百瑞智能设备有限公司 | Bubble eliminating device for phosphating cylindrical workpiece |
| CN114134494A (en) * | 2021-12-03 | 2022-03-04 | 中机生产力促进中心 | RPV main bolt surface phosphating method |
-
2022
- 2022-05-30 CN CN202210596473.7A patent/CN114921783A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206376004U (en) * | 2016-12-28 | 2017-08-04 | 上海天合石油工程股份有限公司 | A kind of thermal phosphorization device of petroleum drilling and mining instrument |
| CN211645384U (en) * | 2019-12-25 | 2020-10-09 | 晋西工业集团有限责任公司 | A hanger for cylindric part bonderizing |
| CN112359353A (en) * | 2020-10-26 | 2021-02-12 | 山东贞元汽车车轮有限公司 | Phosphating liquid supply system and phosphating treatment process for surface of steel ring wheel |
| CN112535883A (en) * | 2020-11-07 | 2021-03-23 | 徐州欧百瑞智能设备有限公司 | Bubble eliminating device for phosphating cylindrical workpiece |
| CN114134494A (en) * | 2021-12-03 | 2022-03-04 | 中机生产力促进中心 | RPV main bolt surface phosphating method |
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