CN113215578A - Surface treatment method for metal shock absorption rod for automobile - Google Patents
Surface treatment method for metal shock absorption rod for automobile Download PDFInfo
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- CN113215578A CN113215578A CN202110525866.4A CN202110525866A CN113215578A CN 113215578 A CN113215578 A CN 113215578A CN 202110525866 A CN202110525866 A CN 202110525866A CN 113215578 A CN113215578 A CN 113215578A
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- shock absorption
- absorption rod
- central part
- end parts
- automobile
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- 238000000034 method Methods 0.000 title claims abstract description 68
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 31
- 230000035939 shock Effects 0.000 title claims abstract description 31
- 238000004381 surface treatment Methods 0.000 title claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 18
- 239000002184 metal Substances 0.000 title claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 30
- 230000003647 oxidation Effects 0.000 claims abstract description 23
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000003754 machining Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 9
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 6
- 239000012044 organic layer Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000007709 nanocrystallization Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910001149 41xx steel Inorganic materials 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 230000006872 improvement Effects 0.000 claims description 2
- 238000005121 nitriding Methods 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052804 chromium Inorganic materials 0.000 abstract description 14
- 239000011651 chromium Substances 0.000 abstract description 14
- 238000007747 plating Methods 0.000 abstract description 10
- 238000012423 maintenance Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
- C23C8/18—Oxidising of ferrous surfaces
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/48—Nitriding
- C23C8/50—Nitriding of ferrous surfaces
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a surface treatment method for a metal shock absorption rod for an automobile, and relates to the technical field of surface treatment of automobile parts. The surface treatment method of the metal shock absorption rod for the automobile comprises the following steps: and S1, machining the round bar stock to generate the shock absorption rod, wherein the shock absorption rod consists of two end parts and a central part, and the end parts and the central part are both cylinders. According to the surface treatment method for the metal shock absorption rod for the automobile, the existing chromium plating method is replaced by the FNC front mirror surface rolling and FNC rear oxidation and hole sealing surface treatment technology, the pollution degree of the production process to the environment is relieved, the pollution treatment cost is reduced, meanwhile, the risk that the chromium coating peels off in the using process is avoided, the work of a shock absorption system is well guaranteed, and the maintenance frequency and the maintenance cost of the shock absorption system are prolonged.
Description
Technical Field
The invention relates to the technical field of surface treatment of automobile parts, in particular to a surface treatment method of a metal shock absorption rod for an automobile.
Background
A damper rod is one of constituent parts of an automobile, and a surface treatment operation is required for the damper rod during a manufacturing process.
The existing shock-absorbing rod adopts a method of surface chromium plating, the method has complex process flow, the process flow seriously pollutes the environment, the pollution treatment cost is high, part of processing plants are forcibly closed due to environmental protection problems, the future chromium plating process is replaced by more environment-friendly surface treatment technology, and meanwhile, the chromium plating layer on the surface has the stripping risk in the use process, and the stripped hard chromium sheet can cut off a sealing ring matched with the shock-absorbing rod, so that the whole shock-absorbing system is invalid, and the maintenance and replacement cost is greatly increased.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a surface treatment method for a metal shock-absorbing rod for an automobile, which solves the problems that the existing shock-absorbing rod adopts a method for plating chromium on the surface, the process flow of the method is complex, the process seriously pollutes the environment, the pollution treatment cost is high, part of processing factories are forcibly shut down continuously due to environmental protection problems, the future chromium plating process is replaced by more environment-friendly surface treatment technology, and meanwhile, the chromium plating layer on the surface has the stripping risk in the use process, and the stripped hard chromium sheet can cut off a sealing ring matched with the shock-absorbing rod, so that the whole shock-absorbing system fails, and the maintenance and replacement cost is greatly increased.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a surface treatment method for a metal shock absorption rod for an automobile comprises the following steps:
s1, machining a round bar to generate a shock absorption rod, wherein the shock absorption rod consists of two end parts and a central part, the end parts and the central part are both cylinders, the two end parts are respectively arranged at the two ends of the central part, the diameter of the end parts is smaller than that of the central part, the specific size is determined according to the actual production requirement, the axes of the two end parts and the central part are positioned on the same straight line, and the end parts and the central part are integrally formed;
s2, before FNC, mirror rolling technique is adopted, so that the surface of the center part of the damping rod obtains a uniform and consistent nanocrystallization structure layer, thereby improving FNC efficiency, generating an oil storage layer on the surface, realizing wear resistance and lubrication, and specifically operating as follows: selecting the feed amount according to the process requirements, adopting the rotating speed of 100-2000RPM, and simultaneously using 2-6 rollers to perform mirror rolling on the surface of the material, so that the surface of the part obtains a uniform and consistent nanocrystallized structure layer;
s3, after the pre-oxidation process is carried out, FNC processing is carried out on the damping rod;
s4, removing the loose layer on the surface layer through process adjustment or grinding, and then carrying out oxidation treatment on the surface of the material to form compact oxides on the surface, prevent rusting and improve corrosion resistance;
s5, adopting coating hole sealing treatment, coating a special organic layer on the post-oxidized surface, isolating the nitrided layer and the matrix from the outside air, and realizing the great improvement of corrosion resistance.
Preferably, the material of the round bar stock is 45 steel or 40 CrMo.
Preferably, in step S4 and step S3, the oxidation treatment and the pre-oxidation process are implemented by introducing water vapor at a high temperature or introducing oxygen at a high temperature.
Preferably, in the step S3, when the pre-oxidation process is performed, the temperature is 300-.
Preferably, in the step S4, the temperature for the oxidation treatment is 350-530 ℃, the duration is 0.5-3h, and the environment for the oxidation treatment adopts air as a medium.
Preferably, in step S5, the material of the organic layer is teflon.
(III) advantageous effects
The invention provides a surface treatment method for a metal shock absorption rod for an automobile. The method has the following beneficial effects:
according to the surface treatment method for the metal shock absorption rod for the automobile, the existing chromium plating method is replaced by the FNC front mirror surface rolling and FNC rear oxidation and hole sealing surface treatment technology, the pollution degree of the production process to the environment is relieved, the pollution treatment cost is reduced, meanwhile, the risk that the chromium coating peels off in the using process is avoided, the work of a shock absorption system is well guaranteed, and the maintenance frequency and the maintenance cost of the shock absorption system are prolonged.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic view of a process curve according to the present invention;
FIG. 3 is a schematic diagram of the features of the product of the present invention;
FIG. 4 is a schematic diagram of the mirror rolling technique and the nano-structure layer according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Referring to fig. 1-4, the present invention provides a technical solution: a surface treatment method for a metal shock absorption rod for an automobile comprises the following steps:
s1, machining a round bar material which is 45 steel or 40CrMo to generate a shock absorption rod, wherein the shock absorption rod consists of two end parts and a central part, the end parts and the central part are both cylinders, the two end parts are respectively arranged at the two ends of the central part, the diameters of the end parts are smaller than that of the central part, the specific sizes are determined according to actual production requirements, the axes of the two end parts and the central part are positioned on the same straight line, and the end parts and the central part are integrally formed;
s2, before FNC, mirror rolling technique is adopted, so that the surface of the center part of the damping rod obtains a uniform and consistent nanocrystallization structure layer, thereby improving FNC efficiency, generating an oil storage layer on the surface, realizing wear resistance and lubrication, and specifically operating as follows: selecting the feed amount according to the process requirements, adopting the rotating speed of 100-2000RPM, and simultaneously using 2-6 rollers to perform mirror rolling on the surface of the material, so that the surface of the part obtains a uniform and consistent nanocrystallized structure layer;
s3, after the pre-oxidation process is carried out, FNC processing is carried out on the damping rod, the temperature is 300-450 ℃ and the duration time is 0.5-2h when the pre-oxidation process is carried out, air is used as a medium in the processing environment, the temperature is 530-620 ℃ and the duration time is 4-14h when the FNC processing is carried out, and NH is used in the processing environment3As a medium, the specific operation mode is gas phase, salt bath or ion nitriding;
s4, removing the loose layer on the surface layer through process adjustment or grinding, and then carrying out oxidation treatment on the surface of the material to form compact oxide on the surface, so as to prevent rusting and improve corrosion resistance, wherein the oxidation treatment and the pre-oxidation process are realized by introducing water vapor under the high-temperature condition or introducing oxygen under the high-temperature condition, the temperature for carrying out the oxidation treatment is 350-530 ℃, the duration is 0.5-3h, and the treatment environment adopts air as a medium;
s5, sealing holes by adopting a coating, and isolating the nitride layer and the matrix from the outside air by coating a special organic layer on the post-oxidized surface to greatly improve the corrosion resistance, wherein the organic layer is made of Teflon.
In summary, the surface treatment method for the metal shock absorption rod for the automobile adopts the FNC front mirror surface rolling and FNC rear oxidation and hole sealing surface treatment technology to replace the existing chromium plating method, relieves the pollution degree of the production process to the environment, reduces the pollution treatment cost, avoids the risk of stripping of the chromium plating layer in the use process, well ensures the work of the shock absorption system, and prolongs the maintenance frequency and the maintenance cost of the shock absorption system.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A surface treatment method for a metal shock absorption rod for an automobile is characterized by comprising the following steps: the method comprises the following steps:
s1, machining a round bar to generate a shock absorption rod, wherein the shock absorption rod consists of two end parts and a central part, the end parts and the central part are both cylinders, the two end parts are respectively arranged at the two ends of the central part, the diameter of the end parts is smaller than that of the central part, the specific size is determined according to the actual production requirement, the axes of the two end parts and the central part are positioned on the same straight line, and the end parts and the central part are integrally formed;
s2, before FNC, mirror rolling technique is adopted, so that the surface of the center part of the damping rod obtains a uniform and consistent nanocrystallization structure layer, thereby improving FNC efficiency, generating an oil storage layer on the surface, realizing wear resistance and lubrication, and specifically operating as follows: selecting the feed amount according to the process requirements, adopting the rotating speed of 100-2000RPM, and simultaneously using 2-6 rollers to perform mirror rolling on the surface of the material, so that the surface of the part obtains a uniform and consistent nanocrystallized structure layer;
s3, after the pre-oxidation process is carried out, FNC processing is carried out on the damping rod;
s4, removing the loose layer on the surface layer through process adjustment or grinding, and then carrying out oxidation treatment on the surface of the material to form compact oxides on the surface, prevent rusting and improve corrosion resistance;
s5, adopting coating hole sealing treatment, coating a special organic layer on the post-oxidized surface, isolating the nitrided layer and the matrix from the outside air, and realizing the great improvement of corrosion resistance.
2. The method for processing the surface of the metal shock absorption rod for the automobile according to claim 1, wherein the method comprises the following steps: the round bar stock is made of 45 steel or 40 CrMo.
3. The method for processing the surface of the metal shock absorption rod for the automobile according to claim 1, wherein the method comprises the following steps: in the step S4 and the step S3, the oxidation treatment and the pre-oxidation process are implemented by introducing water vapor at a high temperature or introducing oxygen at a high temperature.
4. The method for processing the surface of the metal shock absorption rod for the automobile according to claim 1, wherein the method comprises the following steps: in the step S3, the pre-oxidation process is performed at a temperature of 300-450 ℃ for a duration of 0.5-2h, the air is used as the medium in the processing environment, the FNC process is performed at a temperature of 530-620 ℃ for a duration of 4-14h, and NH is used in the processing environment3As media, the specific mode of operation is gas phase, salt bath or ion nitriding.
5. The method for processing the surface of the metal shock absorption rod for the automobile according to claim 1, wherein the method comprises the following steps: in step S4, the temperature for oxidation treatment is 350-530 ℃, the duration is 0.5-3h, and the environment for oxidation treatment adopts air as a medium.
6. The method for processing the surface of the metal shock absorption rod for the automobile according to claim 1, wherein the method comprises the following steps: in step S5, the organic layer is made of teflon.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110525866.4A CN113215578A (en) | 2021-05-14 | 2021-05-14 | Surface treatment method for metal shock absorption rod for automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110525866.4A CN113215578A (en) | 2021-05-14 | 2021-05-14 | Surface treatment method for metal shock absorption rod for automobile |
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| CN113215578A true CN113215578A (en) | 2021-08-06 |
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| CN202110525866.4A Pending CN113215578A (en) | 2021-05-14 | 2021-05-14 | Surface treatment method for metal shock absorption rod for automobile |
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Application publication date: 20210806 |