CN106637047A - Surface passivation film removing method for plate-shaped stainless steel piece - Google Patents
Surface passivation film removing method for plate-shaped stainless steel piece Download PDFInfo
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- CN106637047A CN106637047A CN201611201200.9A CN201611201200A CN106637047A CN 106637047 A CN106637047 A CN 106637047A CN 201611201200 A CN201611201200 A CN 201611201200A CN 106637047 A CN106637047 A CN 106637047A
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- Prior art keywords
- purging
- workpiece
- stainless steel
- activator
- shelf
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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
-
- 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
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a surface passivation film removing method for a plate-shaped stainless steel piece. The surface passivation film removing method comprises the following steps: preparing an activating agent from polytetrafluoroethylene, tetrachloromethane, hydrogen chloride and ethanol; heating, so that the activating agent is cracked into activated gas; placing the stainless steel piece onto a left shelf plate and a right shelf plate of a purging furnace; delivering the activated gas through high-pressure nitrogen gas, and purging the upper surface and the lower surface of the workpiece through an upper purging nozzle and a lower purging nozzle; lifting an ascending-descending plate to support a suspended part of the workpiece; rotating by 90 degrees, and lowering to continue purging. By adopting the surface passivation film removing method, the surface of the stainless steel workpiece is activated in a blowing way, and activated components are more uniform, so that a better activating effect is achieved, time is shortened, the workpiece surface is exposed more fully without any dead angle, and the activating effect is improved further.
Description
Technical field
The invention belongs to technical field of material surface treatment, goes more particularly, to a kind of tabular stainless steel part surface passivated membrane
Except method.
Background technology
Austenitic stainless steel, refers to the stainless steel with austenite structure at normal temperatures, with excellent mechanical property, height
Toughness and plasticity, machinability and corrosion resistance are strong, are widely used in chemical industry, automobile, machinery, sea-freight and ocean component etc.
Field；But austenitic stainless steel is extremely low due to phosphorus content, cause surface strength and hardness relatively low, wear resistance, fatigue resistance
Can be low, have a strong impact on the use range of austenitic stainless steel, or the service life that odd-job part is greatly lowered.Carburizing or nitriding
It is the common method that intensive treatment is carried out to metal surface, concrete grammar is that workpiece is inserted into active carburizing/nitriding to be situated between
In matter, it is incubated after heating, makes the active atoms of carbon/nitrogen-atoms decomposited in above-mentioned medium penetrate into steel part top layer, so as to obtain table
Floor height carbon/bullet layer, the case hardness and intensity for making steel part is significantly increased, while still keeping the good tough of original composition inside steel part
Property and plasticity.
But austenite stainless steel surface has one layer of stable passivating film, the passivating film key component is oxide layer, due to this
The presence of fine and close passivating film so that stainless corrosion resistance and good, but the passivating film has had a strong impact on carbon/nitrogen-atoms stainless
The infiltration and diffusion of steel surface, thus before carburizing/nitrogen process is carried out, it is necessary to the oxide-film is removed, so that making carbon/nitrogen
Atom gos deep into matrix, improves surface abrasion resistance.Current main passivating film minimizing technology, is by N3The gases such as F gases, HCl
Thermal decomposition produces the F or Cl activation stainless steel surfaces of Strong oxdiative, to remove passivating film, but in the activation of specific stainless steel surfaces
During, for plate workpiece, because its volume is larger, it is necessarily required to be positioned on plate, thus always have suitable surface
Product be blocked so that activated gas can not be contacted, and if using clamping by the way of, then due to plate-like piece thickness relatively
It is little, under its own Action of Gravity Field, serious deformation can occur during clamping, thus it is uneven to easily cause surface activation process,
Follow-up carburizing or Nitrizing Treatment are impacted.
The content of the invention
To solve above-mentioned technical problem, the invention provides a kind of tabular stainless steel part surface passivated membrane minimizing technology, adopts
Stainless steel work-piece surface-activation effect is enhanced with Purge methods, while making surface active more uniform.
The complete technical scheme of the present invention includes：
A kind of tabular stainless steel part surface passivated membrane minimizing technology, including activator is prepared, activator is cracked, stainless steel work
Part enters stove, purging activation procedure,
Described activator is formulated as：Activator is configured to using polytetrafluoroethylene (PTFE), carbon tetrachloride, hydrogen chloride, ethanol, institute
State activator component by volume consist of polytetrafluoroethylene (PTFE)：Carbon tetrachloride：Hydrogen chloride：Ethanol=(100-120)：(10-
20)：(1.5-3)：(12-15).
The activator be cracked into by activator be heated to 400 DEG C -450 DEG C be incubated -25 minutes 15 minutes, make activator gas
Change and be cracked into the activation gas containing F, Cl activating component；
The stainless steel enters stove：Stainless steel work-piece is inserted into purging stove, described purging stove includes placing workpiece
Shelf, described shelf includes left shelf and right shelf, and described workpiece both sides are respectively placed on left shelf and right shelf, middle
Position is hanging, and workpiece hanging part lower section is provided with lifting supporting plate, and described lifting supporting plate liftable simultaneously rotates, workpiece top and under
Side is respectively equipped with purge nozzle；
It is described purging activation be：Stainless steel work-piece is inserted after purging stove, using high pressure nitrogen conveying activation gas by upper
Lower purge nozzle is purged to workpiece upper and lower surface, and purging pressure is 0.1-0.5MPa, and purge flow rate is 10-25L/min, is blown
After sweeping 10-15min, lift supporting plate and rise the hanging part for holding workpiece, decline after being subsequently rotated by 90 °, workpiece is held on and is put
On plate, continue to terminate purge after purging 5-10min；
Especially preferred, purging activation is：Stainless steel work-piece is inserted after purging stove, is lived using high pressure nitrogen conveying
Change gas to purge workpiece upper and lower surface by upper and lower purge nozzle, purging pressure is 0.4MPa, and purge flow rate is 20L/
Min, after purging 15min, lifts supporting plate and rises the hanging part for holding workpiece, declines after being subsequently rotated by 90 °, and workpiece is held on
On shelf, continue to terminate purge after purging 5min.
After discharging activated gas, fire door is opened, release shelf, take out workpiece.
Advantage of the present invention relative to prior art be：Stainless steel work-piece surface is activated by the way of purging
Process, improve activation effect, when the processing mode of gas at rest is activated, activating component F or Cl concentration meetings at surface of the work
Reduce with activation process, so as to form concentration difference from outer to inner, because gas is static state, the outer layer activated atom can only be by expanding
Dissipating inwardly is carried out, and it is long to result in soak time, and is adopted by the way of purging, and air-flow is ceaselessly being moved, mixing, activation everywhere
Evenly, so that activation effect is more preferably, the time is shorter for component, while shelf setting in left and right exposes can surface of the work in stove
More fully, rotation supporting plate can be such that all surface is exposed under activated gas, not stay dead angle, further increase activation effect
Really.
Description of the drawings
Fig. 1 is the activation purging furnace structure schematic diagram of the present invention.
In figure：1- bodies of heater, 2- shelves, 3- lifting supporting plates, 4- cylinder rods, 5- oil cylinders, 6- purge nozzles, 7, conveyance conduit,
8- workpiece.
Specific embodiment
With reference to the accompanying drawings and detailed description the present invention will be further described.
Selection volume ratio is polytetrafluoroethylene (PTFE)：Carbon tetrachloride：Hydrogen chloride：Ethanol=100：15：2：12 raw material is configured to
Activator, wherein polytetrafluoroethylene (PTFE), carbon tetrachloride, hydrogen chloride can provide effective fluorine chlorine activation composition, the second in activator
Alcohol can form effectively dissolving to activating component and mix, and above-mentioned activator is heated into 450 DEG C in heating furnace cracking room simultaneously
Insulation 20min so as to which evaporating cracking becomes activating steam.
The tabular stainless steel part 8 of 50cm*30cm*5cm is selected, purging stove, body of heater 1 in described purging stove, body of heater is put into
The interior shelf 2 including placement workpiece, described shelf includes left shelf and right shelf, and described workpiece both sides are respectively placed in a left side and put
On plate and right shelf, middle part is hanging, and workpiece hanging part lower section is provided with lifting supporting plate 3, and described lifting supporting plate lower end connects
The hydraulic stem 4 of hydraulic jack 5 is connect, liftable simultaneously rotates, and purge nozzle 6 is respectively equipped with above and below workpiece, according to workpiece
Size, the nozzle pitch distance is advisable with 20-30cm；Heating furnace cracking room valve is then turned on, activating steam is along conveying
Passage 7 is exported, and HTHP nitrogen pipeline is connected with transfer passage, and nitrogen carries activating steam and reaches purging spray along pipeline
Mouth, purges to workpiece upper and lower surface, and purging pressure is 0.4MPa, and purge flow rate is 20L/min, after purging 15min, workpiece
The big portion of upper and lower surface be activated, now lifting supporting plate is risen and holds the hanging part of workpiece, subsequently will
Workpiece declines after being rotated by 90 °, and workpiece is held on shelf, continues to purge 5min, to activate the position blocked by shelf, subsequently
Terminate purge；
After purging activation terminates, activated gas are discharged using pump, carry out subsequent purification recycling.
Purging stove is opened, tabular stainless steel work-piece is released.
The above, is only presently preferred embodiments of the present invention, and not the present invention is imposed any restrictions, every according to the present invention
Any simple modification, change and equivalent structure change that technical spirit is made to above example, still fall within skill of the present invention
In the protection domain of art scheme.
Claims (4)
1. a kind of tabular stainless steel part surface passivated membrane minimizing technology, including activator is prepared, activator is cracked, stainless steel work-piece
Enter stove, purging activation procedure,
Described activator is formulated as：Activator is configured to using polytetrafluoroethylene (PTFE), carbon tetrachloride, hydrogen chloride, ethanol,
The activator is cracked into and make activator gasify activator heating and be cracked into the activation gas containing F, Cl activating component；
The stainless steel work-piece enters stove：Stainless steel work-piece is inserted into purging stove, described purging stove includes placing workpiece
Shelf, described shelf includes left shelf and right shelf, and described workpiece both sides are respectively placed on left shelf and right shelf, middle
Position is hanging, and workpiece hanging part lower section is provided with lifting supporting plate, and described lifting supporting plate liftable simultaneously rotates, workpiece top and under
Side is respectively equipped with purge nozzle；
It is described purging activation be：Stainless steel work-piece is inserted after purging stove, using high pressure nitrogen conveying activation gas by blowing up and down
Sweep nozzle to purge workpiece upper and lower surface, purging pressure is 0.1-0.5MPa, and purge flow rate is 10-25L/min, purging
After 10-15min, lift supporting plate and rise the hanging part for holding workpiece, decline after being subsequently rotated by 90 °, workpiece is held on into shelf
On, continue to terminate purge after purging 5-10min；
After discharging activated gas, fire door is opened, release shelf, take out workpiece.
2. the method described in claim 1, it is characterised in that the activator component by volume consist of polytetrafluoroethyl-ne
Alkene：Carbon tetrachloride：Hydrogen chloride：Ethanol=(100-120)：(10-20)：(1.5-3)：(12-15).
3. the method described in claim 3, it is characterised in that the activator is cracked into and is heated to activator in activation furnace
400 DEG C -450 DEG C are incubated -25 minutes 15 minutes.
4. the method described in claim 3, it is characterised in that the purging activation is：Stainless steel work-piece is inserted after purging stove,
Using high pressure nitrogen conveying activation gas workpiece upper and lower surface is purged by upper and lower purge nozzle, purging pressure is
0.4MPa, purge flow rate is 20L/min, after purging 15min, lifts supporting plate and rises the hanging part for holding workpiece, subsequently rotation
Decline after 90 °, workpiece is held on shelf, continue to terminate purge after purging 5min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611201200.9A CN106637047A (en) | 2016-12-22 | 2016-12-22 | Surface passivation film removing method for plate-shaped stainless steel piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611201200.9A CN106637047A (en) | 2016-12-22 | 2016-12-22 | Surface passivation film removing method for plate-shaped stainless steel piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106637047A true CN106637047A (en) | 2017-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611201200.9A Pending CN106637047A (en) | 2016-12-22 | 2016-12-22 | Surface passivation film removing method for plate-shaped stainless steel piece |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205661A (en) * | 2019-07-17 | 2019-09-06 | 太仓大田铭博包装容器有限公司 | A kind of heat treatment method improving SPCC steel drum performance |
Citations (5)
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|---|---|---|---|---|
| CN85105469A (en) * | 1985-07-08 | 1987-01-14 | 隆察股份公司 | The acid washing method of workpiece and equipment in the tubulation |
| US4659438A (en) * | 1980-05-29 | 1987-04-21 | Degussa Aktiengesellschaft | Process for the treatment of stainless steel for a direct galvanic gold plating |
| CN101139692A (en) * | 2007-09-28 | 2008-03-12 | 四川航空液压机械厂 | Martensitic stainless steel cementation method and product thereof |
| CN102517541A (en) * | 2011-12-19 | 2012-06-27 | 台州市百达热处理有限公司 | Gas nitriding treatment method of 11Cr17 stainless steel slip sheet |
| CN102828145A (en) * | 2012-08-09 | 2012-12-19 | 武汉材料保护研究所 | Low temperature gas carburizing method for realizing reinforcement and corrosion resistance of austenitic stainless steel |
-
2016
- 2016-12-22 CN CN201611201200.9A patent/CN106637047A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4659438A (en) * | 1980-05-29 | 1987-04-21 | Degussa Aktiengesellschaft | Process for the treatment of stainless steel for a direct galvanic gold plating |
| CN85105469A (en) * | 1985-07-08 | 1987-01-14 | 隆察股份公司 | The acid washing method of workpiece and equipment in the tubulation |
| CN101139692A (en) * | 2007-09-28 | 2008-03-12 | 四川航空液压机械厂 | Martensitic stainless steel cementation method and product thereof |
| CN102517541A (en) * | 2011-12-19 | 2012-06-27 | 台州市百达热处理有限公司 | Gas nitriding treatment method of 11Cr17 stainless steel slip sheet |
| CN102828145A (en) * | 2012-08-09 | 2012-12-19 | 武汉材料保护研究所 | Low temperature gas carburizing method for realizing reinforcement and corrosion resistance of austenitic stainless steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205661A (en) * | 2019-07-17 | 2019-09-06 | 太仓大田铭博包装容器有限公司 | A kind of heat treatment method improving SPCC steel drum performance |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170510 |
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| RJ01 | Rejection of invention patent application after publication |