CN105385982A - QPQ (quench polish quench) salt bath treatment process suitable for water hydraulic component - Google Patents

QPQ (quench polish quench) salt bath treatment process suitable for water hydraulic component Download PDF

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Publication number
CN105385982A
CN105385982A CN201510978022.XA CN201510978022A CN105385982A CN 105385982 A CN105385982 A CN 105385982A CN 201510978022 A CN201510978022 A CN 201510978022A CN 105385982 A CN105385982 A CN 105385982A
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China
Prior art keywords
salt bath
treatment process
temperature
qpq
salt
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Pending
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CN201510978022.XA
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Chinese (zh)
Inventor
郭军
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DEYANG RATA TECHNOLOGY Co Ltd
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DEYANG RATA TECHNOLOGY Co Ltd
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Priority to CN201510978022.XA priority Critical patent/CN105385982A/en
Publication of CN105385982A publication Critical patent/CN105385982A/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
    • C23C8/58—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 By Liquid Or Steam (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The invention provides a QPQ (quench polish quench) salt bath treatment process suitable for a water hydraulic component. The QPQ salt bath treatment process comprises the following process steps: 1) cleaning: under the action of a water-based cleaning agent, ultrasonically cleaning to peel off and drop dirt on the surface of a workpiece; 2) preheating: at a temperature of 350-400 DEG C, heating a workpiece for 10-20 minutes in an air furnace; 3) carrying out salt bath nitriding for 120-150 minutes at a temperature of 420-460 DEG C, wherein nitriding salt consists of the following components in 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; 4) carrying out salt bath oxidization for 15-20 minutes at a temperature of 400-420 DEG C; 5) cooling in air, and mechanically polishing; and 6) oxidizing for 5-10 minutes at a temperature of 400-420 DEG C, and carrying out oil immersion.

Description

Be applicable to the QPQ salt bath treatment process of Water hydraulic component
Technical field
The invention belongs to hardware manufacturing industry technical field, be specifically related to a kind of QPQ salt bath treatment process being applicable to Water hydraulic component.
Background technology
Water hydraulic system have pollution-free, safety, sanitation and hygiene, structure are simple, the high outstanding superiority of efficiency, meet the requirement of cleaner production and Sustainable development.But water hydraulics needs to solve the such as key issue such as sealing and lubrication, attrition and attack.Wearing and tearing, corrosion and fracture are three kinds of principal modes that Parts Materials lost efficacy, and wherein wear out failure is the major cause of material failure.In Technique for Water Hydraulic Components, attrition and attack is also deposited, and mutually promotes.
In order to solve the attrition and attack problem of Technique for Water Hydraulic Components, at present, large multiplex non-corrosive metal, engineering ceramics, polymer and matrix material and Surface Engineering material etc. as Technique for Water Hydraulic Components material, for the manufacture and usage of Technique for Water Hydraulic Components is laid a good foundation.But along with the development of Hydraulic Drive Technology, its range of application is more and more extensive, proposes new requirement to Technique for Water Hydraulic Components material.Such as, in hydraulic impactor, the working conditions more complicated of beater mechanism, not only requires that material has good wear resistance, corrosion stability, and requires higher intensity and toughness.
Summary of the invention
In order to solve the intensity of Water hydraulic component and tough sex chromosome mosaicism, the invention provides a kind of QPQ salt bath treatment process being applicable to Water hydraulic component.Complete processing is simple, all increases substantially through the wear resistance of the Technique for Water Hydraulic Components of Combined Processing and Corrosion Protection.
In order to realize foregoing invention object, the present invention adopts following technical scheme:
Be applicable to the QPQ salt bath treatment process of Water hydraulic component, it 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;
2) preheating
At the temperature of 350-400 DEG C, to workpiece heat 10-20min in air furnace;
3) salt-bath nitriding
Temperature 420-460 DEG C, time 120 ~ 150min, object forms nitride layer and diffusion layer;
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%, Na 2s4-8%, K 2s6-10%, LiOH2-5%;
Preferably, by mass, formula consists of described nitridation salt: 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%.
4) liquid oxidizing
Temperature 400-420 DEG C, time 15 ~ 20min, object forms zone of oxidation;
5) cool
Cool under air, mechanical polishing;
Cooling makes infiltration layer even compact and increases diffusion layer depth; Decompose the CN sticked on workpiece simultaneously.
6) reoxidize
Temperature 400-420 DEG C, time 5 ~ 10min, make workpiece surface supplement oxygen level, immersion oil.
The object of immersion oil is sealing infiltration layer hole, to obtain better resistance to corrosion.
Increase by one polishing process in two stages, remove the softer porousness tectorium in top layer and make its smooth surface.
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.
The vibration frequency range of ultrasonic cleaning of the present invention is at 60 ~ 100kHz, and power density is set in 0.6-1W/C.
Beneficial effect of the present invention is:
1, the present invention adopts novel nitridation salt, can not only keep certain nitrogen gesture, stablize at a higher temperature, also effectively can improve the thickness of processing layer under the lesser temps state of 400-450 DEG C, improves the corrosion resistance of workpiece.
2, pure water pressure workpiece forms the ferroelectric oxide film of one deck iron nitride and densification after QPQ Quench-Polish-Quench technology of the present invention in metallic surface, after polishing is also oxidized again, make chemical combination layer finer and close, oxygen penetrates into the over half of compound thickness, and extend to darker hole place, the further passivation of compound layer of oxygen uptake, thus make metallic surface have higher solidity to corrosion and resistance to.
Embodiment
Below in conjunction with embodiment, essentiality content of the present invention is described in further detail.
Embodiment 1
Be applicable to the QPQ salt bath treatment process of Water hydraulic component, 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;
2) preheating
At the temperature of 350 DEG C, to workpiece heat 20min in air furnace;
3) salt-bath nitriding
Temperature 420 DEG C, time 120min;
By mass, formula consists of described nitridation salt: urea 30%, Na 2cO 34%, K 2cO 36%, Li 2cO 35%, KCNO12%, NaCNO8%, NaCl5%, Na 2s4%, K 2s6%, LiOH2%.
4) liquid oxidizing
Temperature 400 DEG C, time 20min;
5) cool
Cool under air, mechanical polishing;
6) reoxidize
At temperature 400 DEG C, oxidation 10min, after being oxidized, immersion oil.
Embodiment 2
Be applicable to the QPQ salt bath treatment process of Water hydraulic component, 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;
2) preheating
At the temperature of 400 DEG C, to workpiece heat 10min in air furnace;
3) salt-bath nitriding
Temperature 460 DEG C, time 180min;
By mass, formula consists of described nitridation salt: urea 30%, Na 2cO 34%, K 2cO 36%, Li 2cO 38%, KCNO15%, NaCNO8%, NaCl5%, Na 2s4%, K 2s6%, LiOH2%;
4) liquid oxidizing
Temperature 420 DEG C, time 15min;
5) cool
Cool under air, mechanical polishing;
6) reoxidize
At temperature 420 DEG C, oxidation 5min, after being oxidized, immersion oil.
Embodiment 3
Be applicable to the QPQ salt bath treatment process of Water hydraulic component, 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;
2) preheating
At the temperature of 360 DEG C, to workpiece heat 12min in air furnace;
3) salt-bath nitriding
Temperature 420 DEG C, time 160min;
By mass, formula consists of described nitridation salt: urea 50%, Na 2cO 38%, K 2cO 310%, Li 2cO 310%, KCNO25%, NaCNO15%, NaCl8%, Na 2s8%, K 2s10%, LiOH5%.
4) liquid oxidizing
Temperature 410 DEG C, time 16min;
5) cool
Cool under air, mechanical polishing;
6) reoxidize
At temperature 410 DEG C, oxidation 6min, after being oxidized, immersion oil.
Embodiment 4
Be applicable to the QPQ salt bath treatment process of Water hydraulic component, 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;
2) preheating
At the temperature of 380 DEG C, to workpiece heat 15min in air furnace;
3) salt-bath nitriding
Temperature 430 DEG C, time 150min;
By mass, formula consists of described nitridation salt: element 35%, Na 2cO 34.5%, K 2cO 36.5%, Li 2cO 39%, KCNO16%, NaCNO9%, NaCl5.5%, Na 2s4.5%, K 2s7%, LiOH2.5%;
4) liquid oxidizing
Temperature 415 DEG C, time 18min;
5) cool
Cool under air, mechanical polishing;
6) reoxidize
At temperature 415 DEG C, oxidation 8min, after being oxidized, immersion oil.
Embodiment 5
Be applicable to the QPQ salt bath treatment process of Water hydraulic component, 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;
2) preheating
At the temperature of 380 DEG C, to workpiece heat 15min in air furnace;
3) salt-bath nitriding
Temperature 440 DEG C, time 130min;
By mass, formula consists of described nitridation salt: urea 32%, Na 2cO 34.5%, K 2cO 36.5%, Li 2cO 39%, KCNO16%, NaCNO8%, NaCl5.5%, Na 2s4%, K 2s6%, LiOH2%.
7) liquid oxidizing
Temperature 405 DEG C, time 18min;
8) cool
Cool under air, mechanical polishing;
9) reoxidize
At temperature 405 DEG C, oxidation 8min, after being oxidized, immersion oil.
Embodiment 6
The present embodiment is substantially the same manner as Example 1, on this basis:
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 2, on this basis:
Described salt bath needs to pass into pressurized air continuously, and air flow is 410L/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:
Described salt bath needs to pass into pressurized air continuously, and air flow is 420L/h.
The vibration frequency range of described ultrasonic cleaning is at 80kHz, and power density is set in 0.6W/C.
Embodiment 9
The present embodiment is substantially the same manner as Example 4, on this basis:
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.
The vibration frequency range of described ultrasonic cleaning is at 120kHz, and power density is set in 0.5W/C.
Embodiment 10
The present embodiment is substantially the same manner as Example 5, on this basis:
Described salt bath needs to pass into pressurized air continuously, and air flow is 435L/h.
Described salt is wanted slowly to add in batches.
The vibration frequency range of described ultrasonic cleaning is at 60kHz, and power density is set in 1W/C.

Claims (5)

1. be applicable to the QPQ salt bath treatment process of Water hydraulic component, it 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;
2) preheating
At the temperature of 350-400 DEG C, to workpiece heat 10-20min in air furnace;
3) salt-bath nitriding
Temperature 420-460 DEG C, time 120 ~ 150min;
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%, Na 2s4-8%, K 2s6-10%, LiOH2-5%;
4) liquid oxidizing
Temperature 400-420 DEG C, time 15 ~ 20min;
5) cool
Cool under air, mechanical polishing;
6) reoxidize
Temperature 400-420 DEG C, time 5 ~ 10min, immersion oil.
2. the QPQ salt bath treatment process being applicable to Water hydraulic component 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 36-7%, Li 2cO 38-10%, KCNO15-20%, NaCNO8-10%, NaCl5-6%, Na 2s4-5%, K 2s6-8%, LiOH2-3%.
3. the QPQ salt bath treatment process being applicable to Water hydraulic component according to claim 1, it is characterized in that: described salt bath needs to pass into pressurized air continuously, air flow is 400 ~ 450L/h.
4. the QPQ salt bath treatment process being applicable to Water hydraulic component according to claim 1, is characterized in that: described salt is wanted slowly to add in batches.
5. the QPQ salt bath treatment process being applicable to Water hydraulic component according to claim 1, is characterized in that: the vibration frequency range of described ultrasonic cleaning is at 60 ~ 100kHz, and power density is set in 0.6-1W/C.
CN201510978022.XA 2015-12-23 2015-12-23 QPQ (quench polish quench) salt bath treatment process suitable for water hydraulic component Pending CN105385982A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510978022.XA CN105385982A (en) 2015-12-23 2015-12-23 QPQ (quench polish quench) salt bath treatment process suitable for water hydraulic component

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510978022.XA CN105385982A (en) 2015-12-23 2015-12-23 QPQ (quench polish quench) salt bath treatment process suitable for water hydraulic component

Publications (1)

Publication Number Publication Date
CN105385982A true CN105385982A (en) 2016-03-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN105385982A (en)

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Application publication date: 20160309

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