CN105349942A - QPQ (quench-polish-quench) salt bath treatment method - Google Patents

QPQ (quench-polish-quench) salt bath treatment method Download PDF

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Publication number
CN105349942A
CN105349942A CN201510868074.1A CN201510868074A CN105349942A CN 105349942 A CN105349942 A CN 105349942A CN 201510868074 A CN201510868074 A CN 201510868074A CN 105349942 A CN105349942 A CN 105349942A
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Prior art keywords
workpiece
salt bath
qpq
salt
treatment process
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CN201510868074.1A
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Inventor
张一帆
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Chengdu Jinhui Technology Co Ltd
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Chengdu Jinhui Technology Co Ltd
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Priority to CN201510868074.1A priority Critical patent/CN105349942A/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
    • C23C8/52—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 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)
  • Detergent Compositions (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

The invention provides a QPQ (quench-polish-quench) salt bath treatment method which comprises the following processing steps: (1) cleaning: under the action of a water-based cleaning agent, adopting ultrasonic cleaning to strip dirt on the surface of a workpiece and enable the dirt to fall off, wherein the range of the cleaning vibrational frequency is 60-100 kHz, and the power density is set to 0.5-0.8 W/C; (2) preheating: heating the workpiece in an air furnace at 370-390 DEG C; (3) nitriding: placing the preheated workpiece in salt bath of 420-460 DEG C for 90-120 min; and (4) oxidizing and polishing: rinsing the oxidized workpiece with clear water for twice, and then performing mechanical polishing on the workpiece, wherein nitriding salt comprises the following components 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 and 5-8% of NaCl.

Description

The salt bath treatment process of a kind of QPQ
Technical field
The invention belongs to hardware manufacturing industry technical field, be specifically related to the salt bath treatment process of a kind of QPQ.
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 the salt bath treatment process of a kind of QPQ.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:
A salt bath treatment process of QPQ, 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 ~ 100kHz, and power density is set in 0.5-0.8W/C;
2) preheating
At the temperature of 370-390 DEG C, to workpiece heat in air furnace;
3) nitriding
Workpiece after preheating is placed in the salt bath of 420-460 DEG C, process 90-120min;
By mass, formula consists of described nitridation salt: urea 30-50%, Na 2cO 34-8%, K 2cO 36-10%, Li 2cO 35-10%, KCNO12-25%, NaCNO8-15%, NaCl5-8%;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
By mass, formula consists of nitridation salt of the present invention: urea 30-40%, Na 2cO 34-5%, K 2cO 36-8%, Li 2cO 35-6%, KCNO12-20%, NaCNO8-10%, NaCl6-8%
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
A salt bath treatment process of QPQ, 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 370 DEG C, to workpiece heat in air furnace;
3) nitriding
Workpiece after preheating is placed in the salt bath of 420 DEG C, process 120min;
By mass, formula consists of described nitridation salt: urea 30%, Na 2cO 34%, K 2cO 36%, Li 2cO 35%, KCNO12%, NaCNO8%, NaCl5%;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
Embodiment 1
A salt bath treatment process of QPQ, 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 100kHz, and power density is set in 0.8W/C;
2) preheating
At the temperature of 390 DEG C, to workpiece heat in air furnace;
3) nitriding
Workpiece after preheating is placed in the salt bath of 460 DEG C, process 90min;
By mass, formula consists of described nitridation salt: urea 50%, Na 2cO 38%, K 2cO 310%, Li 2cO 310%, KCNO25%, NaCNO15%, NaCl8%;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
Embodiment 1
A salt bath treatment process of QPQ, 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 380 DEG C, to workpiece heat in air furnace;
3) nitriding
Workpiece after preheating is placed in the salt bath of 430 DEG C, process 110min;
By mass, formula consists of described nitridation salt: urea 30%, Na 2cO 34%, K 2cO 36%, Li 2cO 35%, KCNO12%, NaCNO8%, NaCl6%
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
Embodiment 1
A salt bath treatment process of QPQ, 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 375 DEG C, to workpiece heat in air furnace;
3) nitriding
Workpiece after preheating is placed in the salt bath of 440 DEG C, process 95min;
By mass, formula consists of described nitridation salt: urea 50%, Na 2cO 38%, K 2cO 310%, Li 2cO 310%, KCNO25%, NaCNO15%, NaCl8%;
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.
Embodiment 1
A salt bath treatment process of QPQ, 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 0.55W/C;
2) preheating
At the temperature of 37-390 DEG C, to workpiece heat in air furnace;
3) nitriding
Workpiece after preheating is placed in the salt bath of 450 DEG C, process 100min;
By mass, formula consists of described nitridation salt: urea 35%, Na 2cO 34.5%, K 2cO 37%, Li 2cO 35.5%, KCNO15%, NaCNO9%, NaCl7%
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.
Embodiment 1
A salt bath treatment process of QPQ, 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 37-390 DEG C, to workpiece heat in air furnace;
3) nitriding
Workpiece after preheating is placed in the salt bath of 455 DEG C, process 105min;
By mass, formula consists of described nitridation salt: urea 36%, Na 2cO 34%, K 2cO 36%, Li 2cO 35%, KCNO18%, NaCNO9%, NaCl7%
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 350 DEG C, under the effect of saline oxide, be oxidized 20min.
Embodiment 1
A salt bath treatment process of QPQ, 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 95kHz, and power density is set in 0.65W/C;
2) preheating
At the temperature of 385 DEG C, to workpiece heat in air furnace;
3) nitriding
Workpiece after preheating is placed in the salt bath of 450 DEG C, place 100min;
By mass, formula consists of described nitridation salt: urea 36%, Na 2cO 34.5%, K 2cO 36%, Li 2cO 35%, KCNO16%, NaCNO8%, NaCl6%
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 400 DEG C, under the effect of saline oxide, be oxidized 10min.
Embodiment 1
A salt bath treatment process of QPQ, 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 75kHz, and power density is set in 0.75W/C;
2) preheating
At the temperature of 375 DEG C, to workpiece heat in air furnace;
3) nitriding
Workpiece after preheating is placed in the salt bath of 430 DEG C, process 95min;
By mass, formula consists of described nitridation salt: urea 32%, Na 2cO 34%, K 2cO 36%, Li 2cO 35%, KCNO12%, NaCNO9%, NaCl7%
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 440L/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 (5)

1. a salt bath treatment process of QPQ, 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 ~ 100kHz, and power density is set in 0.5-0.8W/C;
2) preheating
At the temperature of 370-390 DEG C, to workpiece heat in air furnace;
3) nitriding
Workpiece after preheating is placed in the salt bath of 420-460 DEG C, process 90-120min;
By mass, formula consists of described nitridation salt: urea 30-50%, Na 2cO 34-8%, K 2cO 36-10%, Li 2cO 35-10%, KCNO12-25%, NaCNO8-15%, NaCl5-8%;
4) oxidation and polishing
Mechanical polishing is adopted by after the workpiece clear water rinsing 2 times after oxidation.
2. the salt bath treatment process of a kind of QPQ according to claim 1, is characterized in that: by mass, formula consists of described nitridation salt: urea 30-40%, Na 2cO 34-5%, K 2cO 36-8%, Li 2cO 35-6%, KCNO12-20%, NaCNO8-10%, NaCl6-8%.
3. the salt bath treatment process of a kind of QPQ according to claim 1, is characterized in that: described salt bath needs to pass into pressurized air continuously, and air flow is 400 ~ 450L/h.
4. the salt bath treatment process of a kind of QPQ according to claim 1, is characterized in that: described salt is wanted slowly to add in batches.
5. the salt bath treatment process of a kind of QPQ according to claim 1, is characterized in that: described oxidation refers at 350-400 DEG C, under the effect of saline oxide, be oxidized 10-20min.
CN201510868074.1A 2015-12-02 2015-12-02 QPQ (quench-polish-quench) salt bath treatment method Pending CN105349942A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107740034A (en) * 2017-10-27 2018-02-27 湖州正德轻工机械有限公司 A kind of surface of workpiece heat treatment method
CN110230023A (en) * 2018-12-14 2019-09-13 台州市晨肇新材料科技有限公司 Metal surface salt-bath nitriding and QPQ technique
CN110230024A (en) * 2018-12-14 2019-09-13 台州市晨肇新材料科技有限公司 For the technique to metal surface nitriding
CN111455394A (en) * 2020-04-20 2020-07-28 中煤北京煤矿机械有限责任公司 QPQ salt bath composite treatment rust-proof and corrosion-proof method
CN111455310A (en) * 2020-05-28 2020-07-28 湖南申亿五金标准件有限公司 QPQ low-temperature direct-current electric field nitriding process and device
CN112545298A (en) * 2020-12-01 2021-03-26 爱仕达股份有限公司 Lightweight stainless iron pot and preparation method thereof

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CN103276344A (en) * 2012-12-28 2013-09-04 郭伟 Deep QPQ salt bath composite strengthening and modifying high and new technology
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CN103276344A (en) * 2012-12-28 2013-09-04 郭伟 Deep QPQ salt bath composite strengthening and modifying high and new technology
CN104372397A (en) * 2014-11-26 2015-02-25 成都川硬合金材料有限责任公司 Electrolytic cleaning process applicable to surface of hard carbon

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107740034A (en) * 2017-10-27 2018-02-27 湖州正德轻工机械有限公司 A kind of surface of workpiece heat treatment method
CN110230023A (en) * 2018-12-14 2019-09-13 台州市晨肇新材料科技有限公司 Metal surface salt-bath nitriding and QPQ technique
CN110230024A (en) * 2018-12-14 2019-09-13 台州市晨肇新材料科技有限公司 For the technique to metal surface nitriding
CN110230023B (en) * 2018-12-14 2021-07-16 常德市广和机械制造有限公司 Metal surface salt bath nitriding and QPQ (quench-Polish-quench) process
CN110230024B (en) * 2018-12-14 2021-08-13 昆山三民涂赖电子材料技术有限公司 Process for nitriding metal surfaces
CN111455394A (en) * 2020-04-20 2020-07-28 中煤北京煤矿机械有限责任公司 QPQ salt bath composite treatment rust-proof and corrosion-proof method
CN111455310A (en) * 2020-05-28 2020-07-28 湖南申亿五金标准件有限公司 QPQ low-temperature direct-current electric field nitriding process and device
CN112545298A (en) * 2020-12-01 2021-03-26 爱仕达股份有限公司 Lightweight stainless iron pot and preparation method thereof
CN112545298B (en) * 2020-12-01 2022-02-22 爱仕达股份有限公司 Lightweight stainless iron pot and preparation method thereof

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