CN105506541A - QPQ salt bath composite treatment process suitable for pure water pressure element - Google Patents

QPQ salt bath composite treatment process suitable for pure water pressure element Download PDF

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Publication number
CN105506541A
CN105506541A CN201510978029.1A CN201510978029A CN105506541A CN 105506541 A CN105506541 A CN 105506541A CN 201510978029 A CN201510978029 A CN 201510978029A CN 105506541 A CN105506541 A CN 105506541A
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China
Prior art keywords
temperature
salt bath
salt
qpq
applicable
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Pending
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CN201510978029.1A
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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 CN201510978029.1A priority Critical patent/CN105506541A/en
Publication of CN105506541A publication Critical patent/CN105506541A/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)
  • Detergent Compositions (AREA)

Abstract

The invention provides a QPQ salt bath composite treatment process suitable for a pure water pressure element. The process comprises the following steps: 1) cleaning: under the effect of a water base cleaning agent, the cleaning is performed by 0.05-0.1 s with a current density of 100-150 A/dm2; 2) preheating: a workpiece is heated by 10-20 min in an air furnace at a temperature of 350-400 DEG C; 3) the salt bath nitriding is performed by 10-180 min at a temperature of 420-460 DEG C; and salt nitride comprises the following components in percentage 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; 4) the salt bath oxidation is performed by 15-20 min at a temperature of 400-420 DEG C; 5) cooling: the cooling is performed in air; and the mechanical polishing is performed; and 6) reoxidation: the oxidation temperature is 400-420 DEG C; the time is 5-10 min; and the oil immersion is performed.

Description

Be applicable to the QPQ salt bath compound 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 compound 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 compound 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 compound process of Water hydraulic component, it is characterized in that: processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, with 100 ~ 150A/dm 2current density cleaning 0.05-0.1s;
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 ~ 180min, 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%;
Preferably, by mass, formula consists of: urea 30-40%, Na 2cO 34-6%, K 2cO 36-8%, Li 2cO 38-10%, KCNO20-25%, NaCNO8-10%, NaCl6-8%.
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.
Oxidation of the present invention refers at temperature 380-400 DEG C, under the effect of saline oxide, be oxidized 15-20min, 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.
The temperature of electrolytic cleaning of the present invention is 70-90 DEG C, and polar plate spacing is 20mm.
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 420-460 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 wear resistance.
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 compound process of Water hydraulic component, processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, with 100A/dm 2current density cleaning 0.1s;
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 180min;
By mass, formula consists of nitridation salt: urea 30%, Na 2cO 34%, K 2cO 36%, Li 2cO 35%, KCNO12%, NaCNO8%, NaCl5%.
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 compound process of Water hydraulic component, processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, with 150A/dm 2current density cleaning 0.05s;
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 120min;
By mass, formula consists of nitridation salt: urea 50%, Na 2cO 38%, K 2cO 310%, Li 2cO 310%, KCNO25%, NaCNO15%, NaCl8%.
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 compound process of Water hydraulic component, processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, with 120A/dm 2current density cleaning 0.06s;
2) preheating
At the temperature of 360 DEG C, to workpiece heat 12min in air furnace;
3) salt-bath nitriding
Temperature 430 DEG C, time 150min;
By mass, formula consists of nitridation salt: urea 30%, Na 2cO 34%, K 2cO 36%, Li 2cO 38%, KCNO20%, NaCNO8%, NaCl6%.
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 compound process of Water hydraulic component, processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, with 130A/dm 2current density cleaning 0.08s;
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 160min;
By mass, formula consists of nitridation salt: urea 40%, Na 2cO 36%, K 2cO 38%, Li 2cO 310%, KCNO25%, NaCNO10%, NaCl8%.
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
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 6
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 7
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 temperature of described electrolytic cleaning is 70 DEG C, and polar plate spacing is 20mm.
Embodiment 8
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 temperature of described electrolytic cleaning is 90 DEG C, and polar plate spacing is 20mm.
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 435L/h.
Described salt is wanted slowly to add in batches.
The temperature of described electrolytic cleaning is 80 DEG C, and polar plate spacing is 20mm.

Claims (5)

1. be applicable to the QPQ salt bath compound process of Water hydraulic component, it is characterized in that: processing step is as follows:
1) clean
Under the effect of aqueous cleaning agent, with 100 ~ 150A/dm 2current density cleaning 0.05-0.1s;
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 ~ 180min;
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) liquid oxidizing
Temperature 400-420 DEG C, time 15 ~ 20min;
5) cool
Cool under air, mechanical polishing;
6) reoxidize
Oxidizing temperature 400-420 DEG C, time 5 ~ 10min, immersion oil.
2. the QPQ salt bath compound 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 34-6%, K 2cO 36-8%, Li 2cO 38-10%, KCNO20-25%, NaCNO8-10%, NaCl6-8%.
3. the QPQ salt bath compound 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 compound 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 compound process being applicable to Water hydraulic component according to claim 1, is characterized in that: the temperature of described electrolytic cleaning is 70-90 DEG C, and polar plate spacing is 20mm.
CN201510978029.1A 2015-12-23 2015-12-23 QPQ salt bath composite treatment process suitable for pure water pressure element Pending CN105506541A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201510978029.1A CN105506541A (en) 2015-12-23 2015-12-23 QPQ salt bath composite treatment process suitable for pure water pressure element

Publications (1)

Publication Number Publication Date
CN105506541A true CN105506541A (en) 2016-04-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106702314A (en) * 2016-12-22 2017-05-24 当涂县宏宇金属炉料有限责任公司 Nitriding compound-treatment method of stainless steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106702314A (en) * 2016-12-22 2017-05-24 当涂县宏宇金属炉料有限责任公司 Nitriding compound-treatment method of stainless steel

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Application publication date: 20160420

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