CN106637046A - Removing method for passivation film on surface of round or cylindrical stainless steel part - Google Patents
Removing method for passivation film on surface of round or cylindrical stainless steel part Download PDFInfo
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- CN106637046A CN106637046A CN201611201196.6A CN201611201196A CN106637046A CN 106637046 A CN106637046 A CN 106637046A CN 201611201196 A CN201611201196 A CN 201611201196A CN 106637046 A CN106637046 A CN 106637046A
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- China
- Prior art keywords
- stainless steel
- workpiece
- activator
- purging
- carrying roller
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Classifications
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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
- 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 removing method for a passivation film on a surface of a round or cylindrical stainless steel part. The removing method comprises the following steps: preparing an activating agent from polytetrafluoroethylene, carbon tetrachloride, hydrogen chloride and ethyl alcohol; heating and cracking the activating agent into activated gas; putting a stainless steel workpiece into a carrier roller of a blowing platform of a blowing furnace; conveying the activated gas by high-pressure nitrogen gas and blowing the surface of the workpiece through a blowing nozzle; changing a contact area of the workpiece and the carrier roller through a carrier roller rotating manner. According to the removing method disclosed by the invention, activation treatment is carried out on the surface of the stainless steel workpiece by adopting a blowing manner and activated components of all parts are more uniform, so that the activation effect is better and the time is shorter; meanwhile, the carrier roller rotates and the surface is more sufficiently exposed and has no dean angles, so that the activation effect is improved.
Description
Technical field
The invention belongs to technical field of material surface treatment, more particularly, to a kind of circular or cylindrical stainless steel part surface
Passivating film minimizing technology.
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, it is difficult to be passivated all of surface of the work film removal using static gas, while now adopt workpiece more
It is placed on shelf or screen and is activated, so for workpiece, always there is the position contacted with shelf or screen, the position connects
Touch less than activated gas, cause surface activation process uneven, 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 circular or cylindrical stainless steel part surface passivated membrane is removed
Method, using Purge methods stainless steel work-piece surface-activation effect is enhanced, while making surface active more uniform.
The complete technical scheme of the present invention includes：
A kind of circular or cylindrical stainless steel part surface passivated membrane minimizing technology, including activator is prepared, activator is cracked,
Stainless steel work-piece 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：Parts of stainless steel is inserted into purging stove, described purging stove includes body of heater 1, in body of heater
There is mounting table 2, described mounting table includes multiple carrying rollers 3, there is gap between multiple carrying rollers, and gap width is less than stainless steel part
Diameter, row's workpiece 4 is put on the gap between carrying roller, and two side contacts carrying rollers keep supporting, and workpiece top is provided with a row and blows
Sweep nozzle；
After heating, using high pressure nitrogen conveying surface of the work is purged by purge nozzle, purging pressure is
0.4MPa, purge flow rate is 20L/min, and after purging 3-5min, carrying roller rotation makes the cylindrical work on carrying roller in carrying roller power
Rotated under effect, and gone in the gap between next carrying roller, continue to purge after 3-5min, carrying roller is reversely rotated, and is made
Toward convolution, contact surface changes again workpiece, repeats to complete activation after said process 2-3 time, after discharging activated gas, opening stove
Door, releases shelf, takes 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 the mode rotated in stove makes surface of the work exposure more fill
Point, all surface is exposed under activated gas, does not stay dead angle, further increases activation effect.
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- mounting tables, 3- carrying rollers, 4- workpiece, 5- purge nozzles.
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.
Diameter 10cm, the circular or cylindrical stainless steel part of length 50cm is selected to be put into purging stove, described purging stove bag
Mounting table is included, described mounting table includes multiple carrying rollers, there is gap between multiple carrying rollers, and gap width is about 5-8cm, and ensures
Less than the diameter of section of stainless steel part, row's workpiece is put on the gap between carrying roller, two side contacts carrying rollers keep supporting, work
Part top is provided with row's purge nozzle；
After heating, using high pressure nitrogen conveying surface of the work is purged by purge nozzle, according to the placement of workpiece
Distance, the nozzle pitch distance is advisable with 10cm, it is ensured that each workpiece has a nozzle alignment workpiece purging, purges pressure
For 0.4MPa, purge flow rate is 20L/min, and after purging 3-5min, carrying roller rotation makes the cylindrical work on carrying roller in carrying roller power
In the presence of rotated, and go in the gap between next carrying roller, so, the contact surface between workpiece and carrying roller is just sent out
Change is given birth to, has continued to purge after 3-5min, carrying roller has been reversely rotated, and makes workpiece toward convolution, and contact surface changes again.The above-mentioned mistake of repetition
Activation is completed after journey 2-3 time.After discharging activated gas, fire door is opened, release shelf, take out workpiece.
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 (1)
1. a kind of circular or cylindrical stainless steel part surface passivated membrane minimizing technology, including activator prepare, activator cracking, no
Rust steel workpiece enters stove, purging activation procedure,
Described activator is formulated as：Activator, the work are configured to using polytetrafluoroethylene (PTFE), carbon tetrachloride, hydrogen chloride, ethanol
Agent 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 gasify simultaneously
It is cracked into the activation gas containing F, Cl activating component；
The stainless steel enters stove：Parts of stainless steel is inserted into purging stove, described purging stove includes mounting table, described placement
Platform includes multiple carrying rollers, there is gap between multiple carrying rollers, and row's workpiece is put support by gap width less than the diameter of stainless steel part
On gap between roller, two side contacts carrying rollers keep supporting, and workpiece top is provided with row's purge nozzle；
After heating, using high pressure nitrogen conveying surface of the work is purged by purge nozzle, purging pressure is 0.4MPa, is blown
It is 20L/min to sweep flow, and after purging 3-5min, carrying roller rotation makes the cylindrical work on carrying roller enter in the presence of carrying roller power
Row rotation, and go in the gap between next carrying roller, continuing to purge after 3-5min, carrying roller is reversely rotated, and makes workpiece back
Rotation, contact surface changes again, repeats to complete activation after said process 2-3 time, and after discharging activated gas, opening fire door, release is put
Plate, takes out workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611201196.6A CN106637046A (en) | 2016-12-22 | 2016-12-22 | Removing method for passivation film on surface of round or cylindrical stainless steel part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611201196.6A CN106637046A (en) | 2016-12-22 | 2016-12-22 | Removing method for passivation film on surface of round or cylindrical stainless steel part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106637046A true CN106637046A (en) | 2017-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611201196.6A Pending CN106637046A (en) | 2016-12-22 | 2016-12-22 | Removing method for passivation film on surface of round or cylindrical stainless steel part |
Country Status (1)
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| CN (1) | CN106637046A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
-
2016
- 2016-12-22 CN CN201611201196.6A patent/CN106637046A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 曹炳炎主编: "《石油化工毒物手册》", 31 May 1992 * |
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