CN105483607A - QPQ nitriding co-permeation nitriding salt and application method thereof - Google Patents

QPQ nitriding co-permeation nitriding salt and application method thereof Download PDF

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Publication number
CN105483607A
CN105483607A CN201510978115.2A CN201510978115A CN105483607A CN 105483607 A CN105483607 A CN 105483607A CN 201510978115 A CN201510978115 A CN 201510978115A CN 105483607 A CN105483607 A CN 105483607A
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China
Prior art keywords
salt
qpq
nitriding
workpiece
application method
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CN201510978115.2A
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Chinese (zh)
Inventor
唐刚全
张丰琼
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SICHUAN QUANFENG NEW MATERIALS TECHNOLOGY Co Ltd
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SICHUAN QUANFENG NEW MATERIALS TECHNOLOGY Co Ltd
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Priority to CN201510978115.2A priority Critical patent/CN105483607A/en
Publication of CN105483607A publication Critical patent/CN105483607A/en
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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
    • 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
    • C23C8/58—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 more than one element being applied in more than one step

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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)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The invention provides QPQ nitriding co-permeation nitriding salt and an application method thereof. The formula of the QPQ nitriding co-permeation nitriding salt comprises, by mass, 30%-50% of urea, 4%-8% of Na2CO3, 6%-10% of K2CO3, 5%-10% of Li2CO3, 12%-25% of KCNO, 8%-15% of NaCNO, 5%-8% of NaCl, 4%-8% of Na2S, 6%-10% of K2S and 2%-5% of LiOH. A certain nitriding potential can be kept under the low temperature state, stability can be achieved at high temperature, the thickness of a treatment layer can be effectively increased, and the corrosion resistance of a workpiece is further improved.

Description

The nitridation salt that a kind of QPQ nitrogenize is oozed altogether and application method thereof
Technical field
The invention belongs to hardware manufacturing industry technical field, be specifically related to nitridation salt that a kind of QPQ nitrogenize oozes altogether and application method thereof.
Background technology
QPQ (Quench-Polish-Quench, quenching-polishing-quenching) essence of technology is low temperature salt-bath nitriding+liquid oxidizing or low temperature salt-bath carbonitriding+liquid oxidizing, it is a kind of metal parts process for modifying surface, has the advantage of high resistance to corrosion, high abrasion, Light deformation.Workpiece surface through QPQ technical finesse is Fe3O4 oxide film, and its corrosion stability is far above the level of the surface protection technique such as chromium plating, nickel plating, and medium carbon steel can replace stainless steel in a lot of field after QPQ process.Meanwhile, QPQ technique can replace traditional Anticorrosion measure such as blackout, phosphatization and nickel plating.At present, the high resistance to corrosion that QPQ technology has causes industries concerned, the very big concern of the industry that especially etching problem such as oil, chemical industry is comparatively serious.
Current known QPQ nitridation salt is by CO (NH 2) 2, Na 2cO 3, K 2cO 3, KOH composition, Applicable temperature is generally between 520 DEG C-600 DEG C, exceeding this nitriding temperature interval, will to appear as nitriding result extreme difference or nitridation salt unstable, the compound layer degree of depth obtained after nitrogenize generally below 20 μm, as being exactly like this at some nitridation salt sold in the market.
201110184878.1, name is called the patent of invention of " a kind of nitridation salt for the nitriding of stainless steel low temperature salt-bath ", discloses a kind of nitridation salt for the nitriding of austenitic stainless steel low temperature salt-bath, is become to be grouped into by weight percentage: KCNO1% ~ 55% by following, NaCNO1% ~ 55%, K 2cO 35% ~ 15%, Na 2cO 33% ~ 15%, Li 2cO 33% ~ 15%, NaCl5% ~ 15%, KCl5% ~ 15%, Na 2sO 40.1% ~ 2%.But, CNO in this formula -too high levels, big for environment pollution, and dangerous.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides nitridation salt and application method thereof that a kind of QPQ nitrogenize oozes altogether.Adopt novel nitridation salt, certain nitrogen gesture can not only be kept under lesser temps state, stablize at a higher temperature, effectively can improve the thickness of processing layer, improve the corrosion resistance of workpiece further.
For achieving the above object, the present invention adopts following technical scheme:
The nitridation salt that QPQ nitrogenize is oozed altogether, it is characterized in that: by mass, formula consists of: urea 30-50%, Na 2cO 34-8%, K 2cO 36-10%, Li 2cO 35-10%, KCNO12-25%, NaCNO8-15%, NaCl5-8%, Na 2s4-8%, K 2s6-10%, LiOH2-5%.
Preferably, by mass, formula consists of: urea 30-40%, Na 2cO 34-5%, K 2cO 36-7%, Li 2cO 38-10%, KCNO15-20%, NaCNO8-10%, NaCl5-6%, Na 2s4-5%, K 2s6-8%, LiOH2-3%;
The application method of the nitridation salt that QPQ nitrogenize of the present invention is oozed altogether, is characterized in that: processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, the dirt of workpiece surface is peeled off and is come off by ultrasonic cleaning, and cleaning vibration frequency range is at 60 ~ 120kHz, and power density is set in 0.5-0.8W/C;
2) preheating
At the temperature of 350-370 DEG C, to workpiece heat in air furnace;
3) nitriding
Nitridation salt described in employing, is placed in the salt bath of 400-450 DEG C by the workpiece after preheating, process 120min;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
Salt bath of the present invention needs to pass into pressurized air continuously, and air flow is 400 ~ 450L/h, and salt bath appropriateness is seethed.
Preferably, described salt is wanted slowly to add in batches, and disposable add-on too much can because reacting violent and excessive salt.
Oxidation of the present invention refers at 350-400 DEG C, under the effect of saline oxide, be oxidized 10-20min, thoroughly decomposes the cyanogen root that workpiece brings out from nitriding furnace, eliminates public hazards; Form black oxide film at workpiece surface simultaneously, increase antiseptic power, also have certain benefit to raising wear resistance.
Embodiment
Below in conjunction with embodiment, essentiality content of the present invention is described in further detail.
Embodiment 1
The nitridation salt that QPQ nitrogenize is oozed altogether, by mass, formula consists of: urea 30%, Na 2cO 34%, K 2cO 36%, Li 2cO 35%, KCNO12%, NaCNO8%, NaCl5%, Na 2s4%, K 2s6%, LiOH2%.
Embodiment 2
The nitridation salt that QPQ nitrogenize is oozed altogether, by mass, formula consists of: urea 30%, Na 2cO 34%, K 2cO 36%, Li 2cO 38%, KCNO15%, NaCNO8%, NaCl5%, Na 2s4%, K 2s6%, LiOH2%;
Embodiment 3
The nitridation salt that QPQ nitrogenize is oozed altogether, by mass, formula consists of: urea 50%, Na 2cO 38%, K 2cO 310%, Li 2cO 310%, KCNO25%, NaCNO15%, NaCl8%, Na 2s8%, K 2s10%, LiOH5%.
Embodiment 4
The nitridation salt that QPQ nitrogenize is oozed altogether, by mass, formula consists of: urea 35%, Na 2cO 34.5%, K 2cO 36.5%, Li 2cO 39%, KCNO16%, NaCNO9%, NaCl5.5%, Na 2s4.5%, K 2s7%, LiOH2.5%;
Embodiment 5
The present embodiment is substantially the same manner as Example 1, on this basis:
The application method of the nitridation salt that described QPQ nitrogenize is oozed altogether, processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, the dirt of workpiece surface is peeled off and is come off by ultrasonic cleaning, and cleaning vibration frequency range is at 60 ~ 120kHz, and power density is set in 0.5-0.8W/C;
2) preheating
At the temperature of 350-370 DEG C, to workpiece heat in air furnace;
3) nitriding
Nitridation salt described in employing, is placed in the salt bath of 400-450 DEG C by the workpiece after preheating, process 120min;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
Embodiment 6
The present embodiment is substantially the same manner as Example 2, on this basis:
The application method of the nitridation salt that described QPQ nitrogenize is oozed altogether, processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, the dirt of workpiece surface is peeled off and is come off by ultrasonic cleaning, and cleaning vibration frequency range is at 60kHz, and power density is set in 0.5W/C;
2) preheating
At the temperature of 350 DEG C, to workpiece heat in air furnace;
3) nitriding
Nitridation salt described in employing, is placed in the salt bath of 400 DEG C by the workpiece after preheating, process 120min;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
Described salt bath needs to pass into pressurized air continuously, and air flow is 400L/h.
Embodiment 7
The present embodiment is substantially the same manner as Example 3, on this basis:
The application method of the nitridation salt that described QPQ nitrogenize is oozed altogether, processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, the dirt of workpiece surface is peeled off and is come off by ultrasonic cleaning, and cleaning vibration frequency range is at 120kHz, and power density is set in 0.8W/C;
2) preheating
At the temperature of 370 DEG C, to workpiece heat in air furnace;
3) nitriding
Nitridation salt described in employing, is placed in the salt bath of 450 DEG C by the workpiece after preheating, process 120min;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
Described salt bath needs to pass into pressurized air continuously, and air flow is 450L/h.
Described salt is wanted slowly to add in batches.
Embodiment 8
The present embodiment is substantially the same manner as Example 3, on this basis:
The application method of the nitridation salt that described QPQ nitrogenize is oozed altogether, processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, the dirt of workpiece surface is peeled off and is come off by ultrasonic cleaning, and cleaning vibration frequency range is at 70kHz, and power density is set in 0.6W/C;
2) preheating
At the temperature of 355 DEG C, to workpiece heat in air furnace;
3) nitriding
Nitridation salt described in employing, is placed in the salt bath of 410 DEG C by the workpiece after preheating, process 120min;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
Described salt bath needs to pass into pressurized air continuously, and air flow is 400L/h.
Described salt is wanted slowly to add in batches.
Described oxidation refers at 350 DEG C, under the effect of saline oxide, be oxidized 20min.
Embodiment 9
The present embodiment is substantially the same manner as Example 4, on this basis:
The application method of the nitridation salt that described QPQ nitrogenize is oozed altogether, processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, the dirt of workpiece surface is peeled off and is come off by ultrasonic cleaning, and cleaning vibration frequency range is at 80kHz, and power density is set in 0.7W/C;
2) preheating
At the temperature of 360 DEG C, to workpiece heat in air furnace;
3) nitriding
Nitridation salt described in employing, is placed in the salt bath of 420 DEG C by the workpiece after preheating, process 120min;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
Described salt bath needs to pass into pressurized air continuously, and air flow is 420L/h.
Described salt is wanted slowly to add in batches.
Described oxidation refers at 400 DEG C, under the effect of saline oxide, be oxidized 10min.
Embodiment 10
The present embodiment is substantially the same manner as Example 4, on this basis:
The application method of the nitridation salt that described QPQ nitrogenize is oozed altogether, processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, the dirt of workpiece surface is peeled off and is come off by ultrasonic cleaning, and cleaning vibration frequency range is at 90kHz, and power density is set in 0.65W/C;
2) preheating
At the temperature of 365 DEG C, to workpiece heat in air furnace;
3) nitriding
Nitridation salt described in employing, is placed in the salt bath of 440 DEG C by the workpiece after preheating, process 120min;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
Described salt bath needs to pass into pressurized air continuously, and air flow is 430L/h.
Described salt is wanted slowly to add in batches.
Described oxidation refers at 360 DEG C, under the effect of saline oxide, be oxidized 15min.

Claims (6)

1. the nitridation salt that oozes altogether of QPQ nitrogenize, it is characterized in that: by mass, formula consists of: urea 30-50%, Na 2cO 34-8%, K 2cO 36-10%, Li 2cO 35-10%, KCNO12-25%, NaCNO8-15%, NaCl5-8%, Na 2s4-8%, K 2s6-10%, LiOH2-5%.
2. the nitridation salt that oozes altogether of a kind of QPQ nitrogenize according to claim 1, it is characterized in that: by mass, formula consists of: urea 30-40%, Na 2cO 34-5%, K 2cO 36-7%, Li 2cO 38-10%, KCNO15-20%, NaCNO8-10%, NaCl5-6%, Na 2s4-5%, K 2s6-8%, LiOH2-3%.
3. the application method of nitridation salt that oozes altogether of a kind of QPQ nitrogenize according to claim 1, is characterized in that: processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, the dirt of workpiece surface is peeled off and is come off by ultrasonic cleaning, and cleaning vibration frequency range is at 60 ~ 120kHz, and power density is set in 0.5-0.8W/C;
2) preheating
At the temperature of 350-370 DEG C, to workpiece heat in air furnace;
3) nitriding
Nitridation salt described in employing, is placed in the salt bath of 400-450 DEG C by the workpiece after preheating, process 120min;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
4. the application method of nitridation salt that oozes altogether of a kind of QPQ nitrogenize according to claim 3, it is characterized in that: described salt bath needs to pass into pressurized air continuously, air flow is 400 ~ 450L/h.
5. the application method of nitridation salt that oozes altogether of a kind of QPQ nitrogenize according to claim 3, is characterized in that: described salt is wanted slowly add in batches.
6. the application method of nitridation salt that oozes altogether of a kind of QPQ nitrogenize according to claim 3, is characterized in that: described oxidation refers at 350-400 DEG C, under the effect of saline oxide, is oxidized 10-20min.
CN201510978115.2A 2015-12-23 2015-12-23 QPQ nitriding co-permeation nitriding salt and application method thereof Pending CN105483607A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106521497A (en) * 2016-10-13 2017-03-22 广西大学 Petroleum machine part surface treatment method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106521497A (en) * 2016-10-13 2017-03-22 广西大学 Petroleum machine part surface treatment method

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Application publication date: 20160413