CN110438511A - A kind of rust-proofing method of stainless steel support - Google Patents
A kind of rust-proofing method of stainless steel support Download PDFInfo
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- CN110438511A CN110438511A CN201910884060.7A CN201910884060A CN110438511A CN 110438511 A CN110438511 A CN 110438511A CN 201910884060 A CN201910884060 A CN 201910884060A CN 110438511 A CN110438511 A CN 110438511A
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- stainless steel
- steel support
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C23C8/12—Oxidising using elemental oxygen or ozone
- C23C8/14—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
- 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
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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)
- General Chemical & Material Sciences (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The present invention relates to a kind of antirusting methods of stainless steel support.The following steps are included: heating stainless steel support to improve its surface reaction activity；The surface of stainless steel support, the oxide of iron are aoxidized while hot；It is cleaned with acid, to remove the oxide of the iron of part；Under nitrogen atmosphere, stainless steel support is warming up to 912 DEG C or more, very fast cooling then is carried out to the stainless steel support under the condition of high temperature, generates one layer of nitride film in stainless steel surface.The nitride layer energy anti-corrosion effect that the present invention has; but the anti-corrosion of the application not relies solely on this layer of oxynitride layer; due to the higher corrosion resistant protection zone of Surface Creation of the present invention chromium content, even if because of friction destruction oxynitride layer, moreover it is possible to continue to provide anti-corrosion protection；Additionally by heating and heat preservation, the dense oxide layer of iron and the dense oxide layer of chromium can also form a degree of fusion, further improve the effect of anti-corrosion.
Description
Technical field
The present invention relates to a kind of method of anti-corrosion more particularly to a kind of antirusting methods of stainless steel support.
Background technique
Fastener is also referred to as standard component on the market, is to be fastenedly connected into two or more parts (or component)
The general name of used a kind of machine components when for an entirety.Its feature is that description is various, and performance purposes is different, and
And it is standardization, seriation, unitized strong.Fastener is most widely used mechanical basic part, is in great demand.
It generally includes bolt, stud, screw, nut, tapping screw, wood screw, rivet, washer etc..Although these are marked
Quasi- part usually all makes of stainless steel, but since they will use in condition harsh environment, even if using stainless steel, sometimes
A degree of corrosion can also occur for time.And stainless steel also has up to more than 100 kinds, some stainless steels only resistance to weak corrosive medium,
It is not acidproof；The corrosion-resistant attribute of stainless steel has substantial connection with their chemical composition and structure.
In the prior art, in order to solve the problems, such as the corrosion-resistant of stainless steel support.Generally use the side of plating or passivation
Method.Although with galvanoplastic, as galvanizing production is reliable in quality, but toxic reagent can be used, these reagents not only can
Workshop condition is influenced, workers ' health is threatened, can also generate irreversible destruction to ambient enviroment if do not dealt carefully with.The examination of passivation
Agent equally exists such problems.
The Chinese invention patent application of Publication No. CN 109594037A discloses a kind of raising stainless steel product anti-corrosion
The environment-protective process of erosion.Then it is warming up to 1000 DEG C or so first to stainless steel work-piece pickling, finally cooling with nitrogen, thus
Stainless steel surface generates a thin layer of nitride film.But the nitration case is too thin, and nitration case is not wear-resisting, is easy breakage, it is difficult
To play the role of long-term anti-corrosion.
Summary of the invention
The invention solves the above problems, to provide a kind of rust-proofing method of stainless steel support.
Technical proposal that the invention solves the above-mentioned problems is as follows:
A kind of rust-proofing method of stainless steel support, comprising the following steps:
(1), it by water washing of the stainless steel support containing surfactant, degreases, then rinses；
(2), stainless steel support is heated to 250 ~ 300 DEG C, to improve its surface reaction activity；
(3), the surface of stainless steel support is aoxidized while hot, generates the oxidation of the iron such as iron oxide, ferrous oxide, ferroso-ferric oxide
Object；
(4), the stainless steel support surface is cleaned with acid, to remove the oxide of the iron of part；
(5), under nitrogen atmosphere, stainless steel support is warming up to 912 DEG C or more, promotes the institutional framework of stainless steel support
Change from body-centered cubic to face-centered cubic；Then very fast cooling is carried out to the stainless steel support under the condition of high temperature, make it is stainless
While steel fastening at least retains the face-centered cubic institutional framework of part, one layer of nitride film is generated in stainless steel surface.
In above-mentioned technical proposal of the present invention, after pre-processing to stainless steel work-piece, heating is first passed through to improve its table
Existing reactivity is allowed to be easier to be oxidized；Then make the surface of stainless steel work-piece that oxygen occur using some oxidation means
Change, after oxidation, stainless steel surface generates the oxide of some iron, and the oxide of these iron is not single, has iron oxide, oxidation sub-
Iron and ferroso-ferric oxide, and form the oxidized surface of different compactness extents, wherein ferroso-ferric oxide is more loose, iron oxide compared with
For densification, but they all Dispersed precipitate is on the surface of stainless steel work-piece, ferrous oxide is equally distributed in workpiece surface but it is most pasted
The interior tissue of nearly workpiece；In this process, not only the oxide of iron generates, also the easy oxide for generating chromium, and chromium
Oxide is more close to interior tissue, and its oxide layer is more fine and close, and the oxide of chromium once being formed can be one
Determine the further oxidation that stainless steel work-piece is prevented under degree；And the heating power of the iron being heated so that in stainless steel due to workpiece
It learns activity to reinforce, along with the content of iron is also more, is more easier to be distributed to the surface of workpiece, therefore in general, oxidation
The oxide of oxide and iron that more iron can be generated is easier to appear in surface；And form the oxygen of a thin layer of chromium
Compound layer, to prevent further oxidation.And after removing the oxide of workpiece surface iron by further means, actually
It is reduction of the content of workpiece surface iron for entire workpiece, increases the ratio of chromium.And chromium and its oxide have very
Strong corrosion-resistant effect.The present invention is modified stainless steel work-piece surface by this method, to greatly improve stainless steel
Corrosion resistance.For another angle, content of the chromium in stainless steel work-piece is typically not greater than 20wt%, even if passing through one
A little means improve certain ratio on its surface, but still can not be in the oxygen of one layer of complete fine and close chromium of workpiece surface generation
The ingredient of compound film, iron and its oxi still accounts for major part.By the above method, although the surface of iron can also generate some phases
To comparatively dense oxide, such as iron oxide layer；But still can not coating workpieces whole surface, it is some loose being removed through overpickling
Iron oxide after, still have a small amount of fe exposure；The present invention is kept finally by being warming up to 912 DEG C or more
30min or more promotes the institutional framework of stainless steel support to change from body-centered cubic to face-centered cubic, and it is strong to form solid solution phase
Change, that is, the metallurgical structure of workpiece is changed from ferrite to austenite, then, by extremely cold under high temperature, makes
The face-centred cubic structure for obtaining austenite is at least able to part reservation；Again since the extremely cold medium taken is nitrogen, nitrogen is in such high temperature
Under, a degree of reaction can be generated with fe, one layer of fine and close nitride layer film be generated, to greatly improve stainless
The anti-corrosion ability of steel workpiece.In addition during heating and heat preservation, and atomic thermal motion is accelerated, so that stainless steel work
A degree of variation occurs for inside part and surface, so that internal and surface more homogenizes, so that originally relatively independent
A degree of fusion also occurs for iron oxide and chromium oxide in different levels, to further improve stainless steel work-piece
Anti-corrosion ability.
As a preferred embodiment of the above technical solution, before step (5), step (2) ~ (4) is repeated, stainless steel is further adjusted
Surface chrome content.
Although modified by surface, the corrosion resistance of stainless steel work-piece is improved, the corrosion resistant energy improved by this method
Power is not comprehensive, because content of the chromium in stainless steel work-piece is typically not greater than 20wt%, even if by some means at it
Surface improves certain ratio, but still can not generate the sull of one layer of complete fine and close chromium in workpiece surface,
It can be only formed the oxide of the chromium of Dispersed precipitate.So the present invention repeats step (2) ~ (4), to further increase stainless steel
Surface chrome content, to further increase the corrosion resistance of stainless steel.
As a preferred embodiment of the above technical solution, the chromium content of the stainless steel support material is in 15 ~ 25wt%.
It as a preferred embodiment of the above technical solution, also include the molybdenum of 0.5 ~ 2.0wt% in the material of the stainless steel support.
Since chloride ion has very strong coordination ability, especially under oxidative conditions, chloride ion is for stainless steel
Corrosive power significantly improves；Intercrystalline corrosion and stress corrosion are mainly shown as, to destroy passivating film.Molybdenum can in stainless steel
Resistance to corrosion is improved to a certain degree, especially for the corrosion of chloride ion.But the content of molybdenum is again unsuitable excessively high, because molybdenum adds
Add and will also result in certain negative effect, for example plasticity and toughness is caused to decline.Therefore in fastener of the invention, molybdenum content control
More it is suitable in 0.5 ~ 2.0wt%.
It as a preferred embodiment of the above technical solution, also include the nickel of 8 ~ 15wt% in the material of the stainless steel support.
The advantages of austenitic steel, is to confer to the better comprehensive performance of stainless steel work-piece.And nickel forms austenitic stainless steel
A kind of base alloy elements.A large amount of presence of nickel can promote the formation and stabilization of austenite.
It as a preferred embodiment of the above technical solution, also include 0.02wt% carbon below in the material of the stainless steel support.
Carbon can strengthen the rigidity and intensity of austenitic steel to a certain degree, its content can not be excessive, although containing
It measures up to 0.1wt%, but the carbon of high-content is easy combined with chromium at high temperature, generates chromium carbide, be precipitated, cause in crystal boundary
The surface of stainless steel work-piece or the internal chromium depleted phenomenon of appearance, it is clear that it is contradiction that this, which is followed the present invention claims the design for improving chromium content,
, therefore the present invention claims carbon is controlled in 0.02wt% or less.
As a preferred embodiment of the above technical solution, in step (3), the oxidation carries out under oxygen-enriched environment.
As above-mentioned technical proposal another preferred, in step (3), the oxidation is carried out in nitric acid solution.
It is as above-mentioned technical proposal another preferably, in step (3), the oxidation is in hydrogen peroxide or sodium peroxide
It is carried out in solution.
Oxidation in above-mentioned technical proposal of the present invention, different from the prior art for the passivation of stainless steel.The prior art
In pickling be usually to use nitric acid, generate passivation whereby.In the present invention, passivation is not main purpose, and main purpose is
Part iron is removed, to achieve the effect that improve surface chromium content；But stainless steel surface can also be made to generate one while this process
Determine the passivation of degree.But due to first being heated to stainless steel work-piece in the present invention, reactivity is improved, is caused
The comparison that oxidation process occurs is rapid, and degree is also more violent；Therefore more oxidizing substances can be generated, produce more causes
Close oxide skin(coating) also produces the oxide of more loose iron.Therefore, subsequent also to need to be further processed.
As a preferred embodiment of the above technical solution, in step (4), the acid is selected from hydrochloric acid, dilute sulfuric acid, oxalic acid, formic acid, lemon
One of lemon acid etc. is a variety of.
Above-mentioned technical proposal of the present invention is directly passivated different from stainless steel in the prior art.Passivation in the prior art
It after usually being pre-processed to stainless steel work-piece, is directly cleaned with passivating solution, such as nitric acid, the use done so is: first is that going
Except some dirts for influencing compact oxide film generation；Two are to speed up the generation of compact oxide film.And in the present invention, by
In having carried out Strong oxdiative processing before passivation, while generating dense oxide, also create some than more loose oxidation
Object film, such as ferroso-ferric oxide, this just needs to remove by pickling, these acid are different from nitric acid, does not have oxygen usually
The property changed, their effect is the oxide for removing some loose iron, and to relatively unsound portion in fine and close oxide
It point causes to corrode, improves the quality of the oxide left whereby.Therefore, in the present invention, the degree and mode of pickling and side
Method needs control, and practical operation is determined depending on pH, usually using the non-oxidizing acid of pH2 ~ 3 or so, embathe 3 ~ 5min, so
After rinse, finally see whether light decides whether further to rinse product surface.Pickling in the prior art is usually
With nitric acid, passivation is generated whereby；And in the application, passivation is not main purpose, and main purpose is removal part iron, with
Achieve the purpose that improve surface chromium content, but so that stainless steel surface is generated a degree of passivation while this process and make
With.After pickling of the present invention, after the oxide skin(coating) for removing loose iron, the oxidation of the relatively compact iron of sub-fraction is had also been removed
Object, and remaining metal oxide is usually all very fine and close structure, therefore the present invention can significantly improve stainless steel work-piece
Corrosion resistance.
As a preferred embodiment of the above technical solution, the rapid cooling is the liquid cooling carried out using simple substance nitrogen as medium or wind
It is cold.
In conclusion the invention has the following advantages:
To sum up, the nitride layer energy anti-corrosion effect that the present invention has, but the anti-corrosion of the application not relies solely on this layer
Oxynitride layer, due to the higher corrosion resistant protection zone of Surface Creation of the present invention chromium content, even if because friction destruction
Oxynitride layer, moreover it is possible to continue to provide anti-corrosion protection；Additionally by heating and heat preservation, the dense oxide layer of iron and chromium
Dense oxide layer can also form a degree of fusion, further improve the effect of anti-corrosion.
Specific embodiment
Present embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Any change for being made after having read specification of the invention of member, as long as within the scope of the claims, it all will be by
The protection of Patent Law.
Embodiment one
A kind of rust-proofing method of stainless steel support, comprising the following steps:
(1), it by water washing of the stainless steel support containing surfactant, degreases, then rinses；
(2), stainless steel support is heated to 300 DEG C, to improve its surface reaction activity；
(3), iron oxide, ferrous oxide, ferroso-ferric oxide etc. are generated with the surface of oxygen-enriched atmosphere oxidation stainless steel support while hot
The oxide of iron；A degree of oxidation is also generated with season chromium；
(4), the stainless steel support is embathed with the dilute hydrochloric acid that pH is 3, some oxide skin(coating)s is made to fall off, to remove
The iron of the partial state of oxidation；Then it is rinsed with the dilute hydrochloric acid, until the stainless steel support surface-brightening；
(5), under nitrogen atmosphere, stainless steel support is warming up to 912 DEG C or more, promotes the institutional framework of stainless steel support
Change from body-centered cubic to face-centered cubic, while melts the oxide generation of the oxide and chromium of the iron on stainless steel work-piece surface
It closes；Then very fast cooling is carried out with nitrogen to the stainless steel support under the condition of high temperature, retains stainless steel support at least
While partial face-centered cubic institutional framework, one layer of nitride film is generated in stainless steel surface.
The material of the stainless steel support, chromium content 15wt%, nickel content 8wt%, molybdenum content 0.5wt%, carbon contain
Amount is 0.02wt% and some inevitable impurity, surplus are iron.
Embodiment two
A kind of rust-proofing method of stainless steel support, comprising the following steps:
(1), it by water washing of the stainless steel support containing surfactant, degreases, then rinses；
(2), stainless steel support is heated to 300 DEG C, to improve its surface reaction activity；
(3), the oxide of iron is generated with the surface of dust technology oxidation stainless steel support while hot；It is also generated with season chromium
A degree of oxidation；
(4), the stainless steel support is embathed with the dilute sulfuric acid that pH is 2, some oxide skin(coating)s is made to fall off, to remove
The iron of the partial state of oxidation；Then it is rinsed with the dilute hydrochloric acid, until the stainless steel support surface-brightening；Then it repeats
Step (2) ~ (4) further adjust the content of stainless steel work-piece surface ferro element and chromium；
(5), under nitrogen atmosphere, stainless steel support is heated up 912 DEG C or more, promote the institutional framework of stainless steel support from
Body-centered cubic changes to face-centered cubic, while the oxide of the iron on stainless steel work-piece surface and the oxide of chromium being made to generate fusion；
Then very fast cooling is carried out with nitrogen to the stainless steel support under the condition of high temperature, stainless steel support is made at least to retain part
Face-centered cubic institutional framework while, stainless steel surface generate one layer of nitride film.
The material of the stainless steel support, chromium content 18wt%, nickel content 8wt%, molybdenum content 1.0wt%, carbon contain
Amount is 0.02wt% and some inevitable impurity, surplus are iron.
Embodiment three
A kind of rust-proofing method of stainless steel support, comprising the following steps:
(1), it by water washing of the stainless steel support containing surfactant, degreases, then rinses；
(2), stainless steel support is heated to 300 DEG C, to improve its surface reaction activity；
(3), the oxide of iron is generated with the surface of dust technology oxidation stainless steel support while hot；It is also generated with season chromium
A degree of oxidation；
(4), the stainless steel support is embathed with the formic acid solution that pH is 2, so that some oxide skin(coating)s is fallen off, to remove
Remove the iron of the state of oxidation of part；Then it is rinsed with the dilute hydrochloric acid, until the stainless steel support surface-brightening；Then it weighs
Multiple step (2) ~ (4), further adjust the content of stainless steel work-piece surface ferro element and chromium；
(5), under nitrogen atmosphere, stainless steel support is heated up 912 DEG C or more, promote the institutional framework of stainless steel support from
Body-centered cubic changes to face-centered cubic, while the oxide of the iron on stainless steel work-piece surface and the oxide of chromium being made to generate fusion；
Then very fast cooling is carried out with nitrogen to the stainless steel support under the condition of high temperature, stainless steel support is made at least to retain part
Face-centered cubic institutional framework while, stainless steel surface generate one layer of nitride film.
The material of the stainless steel support, chromium content 25wt%, nickel content 15wt%, molybdenum content 2.0wt%, carbon
Content is 0.02wt% and some inevitable impurity, surplus are iron.
According to GB/T 4334-2008 standard " corrosion of metal and alloy-stainless steel intercrystalline corrosion test method ", use
" stainless steel sulfuric acid-copper sulphate corrosion tests " measures embodiment one, embodiment two, embodiment three, three kinds of stainless steel work-pieces
Corrosion resistance.
Experimental detail:
A, by 100 g analytical pure sulfuric acid copper dissolutions in 700 ml distilled water, 100 ml bright sulfur acid is added, distilled water is then used
1000 ml are diluted to, sulfuric acid-copper-bath is configured to.
B, this solution is fitted into the ground conical flask with reflux condenser, spreads the copper scale of purity 99.8%, then placed
M3 specification, the stainless steel bolt of length 8MM, the bolt use 4 kinds of different materials, respectively correspond embodiment one, embodiment two,
Embodiment three and comparative example (304L stainless steel).
C, flask is placed on heating device and passes to cooling water, Heating Experiment solution keeps slight boiling condition, after continuous 16 h
It takes out and cleans, is dry, observed after curving it 180 °.
As a result: the equal relative smooth in sample crooked position outer surface and side does not observe crackle under low magnification,
Middle one stainless steel crooked position outer surface relative coarseness of embodiment, there is faint cracking phenomena in side；And 304L stainless steel is curved
Pars convoluta position outer surface is obviously coarse, and apparent cracking phenomena occurs in side.These the result shows that, the corrosion resistance phase of 304L
To lower, it is easier that intercrystalline corrosion occurs.Stainless steel work-piece of the invention has good corrosion resistance；But its corrosion resistant
Corrosion can have direct relation with chromium content.Since chromium content is relatively low and more stainless than 304L in embodiment one
Steel is also low, but its performance is significantly better than 304L stainless steel；This shows that anti-corrosion processing of the invention has a significant effect.
Claims (8)
1. a kind of rust-proofing method of stainless steel support, comprising the following steps:
(1), it by water washing of the stainless steel support containing surfactant, degreases, then rinses；
(2), stainless steel support is heated to 250 ~ 300 DEG C, to improve its surface reaction activity；
(3), the surface for aoxidizing stainless steel support while hot, generates the oxide of iron；
(4), the stainless steel support surface is cleaned with acid, to remove the oxide of part iron；
(5), under nitrogen atmosphere, stainless steel support is warming up to 912 DEG C or more, promotes the institutional framework of stainless steel support
Change from body-centered cubic to face-centered cubic；Then very fast cooling is carried out to the stainless steel support under the condition of high temperature, make it is stainless
While steel fastening at least retains the face-centered cubic institutional framework of part, one layer of nitride film is generated in stainless steel surface.
2. a kind of rust-proofing method of stainless steel support according to claim 1, it is characterised in that: before step (5),
It repeats step (2) ~ (4), further to adjust the surface chrome content of stainless steel support.
3. a kind of rust-proofing method of stainless steel support according to claim 1, it is characterised in that: the stainless steel is tight
Firmware, chromium content is in 15 ~ 25wt%.
4. a kind of rust-proofing method of stainless steel support according to claim 1, it is characterised in that: described in step (3)
Oxidation carries out under oxygen-enriched environment.
5. a kind of rust-proofing method of stainless steel support according to claim 1, it is characterised in that: described in step (3)
Oxidation is carried out in nitric acid solution.
6. a kind of rust-proofing method of stainless steel support according to claim 1, it is characterised in that: described in step (3)
Oxidation is carried out in hydrogen peroxide or sodium peroxide solution.
7. a kind of rust-proofing method of stainless steel support according to claim 1, it is characterised in that: described in step (4)
Acid be selected from one of hydrochloric acid, dilute sulfuric acid, oxalic acid, formic acid, citric acid.
8. a kind of rust-proofing method of stainless steel support according to claim 1, it is characterised in that: the rapid cooling
It is the liquid cooling carried out using simple substance nitrogen as medium or air-cooled.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111022469A (en) * | 2019-12-31 | 2020-04-17 | 东台市展新不锈钢紧固件制造有限公司 | Rust prevention method for stainless steel fastener |
| CN111118511A (en) * | 2019-12-30 | 2020-05-08 | 东台市展新不锈钢紧固件制造有限公司 | Method for improving corrosion resistance of stainless steel fastener |
| WO2022165093A1 (en) * | 2021-01-29 | 2022-08-04 | Ut-Battelle, Llc | Fastener joint and associated method for avoiding corrosion of dissimilar material fastener joints |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111118511A (en) * | 2019-12-30 | 2020-05-08 | 东台市展新不锈钢紧固件制造有限公司 | Method for improving corrosion resistance of stainless steel fastener |
| CN111022469A (en) * | 2019-12-31 | 2020-04-17 | 东台市展新不锈钢紧固件制造有限公司 | Rust prevention method for stainless steel fastener |
| WO2022165093A1 (en) * | 2021-01-29 | 2022-08-04 | Ut-Battelle, Llc | Fastener joint and associated method for avoiding corrosion of dissimilar material fastener joints |
| US11808297B2 (en) * | 2021-01-29 | 2023-11-07 | Ut-Battelle, Llc | Fastener joint and associated method for avoiding corrosion of dissimilar material fastener joints |
| US20240035502A1 (en) * | 2021-01-29 | 2024-02-01 | Ut-Battelle, Llc | Fastener joint and associated method for avoiding corrosion of dissimilar material fastener joints |
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