CN105839165A - Austenitic stainless steel and treatment method for improving hardness and corrosion resistance - Google Patents

Austenitic stainless steel and treatment method for improving hardness and corrosion resistance Download PDF

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Publication number
CN105839165A
CN105839165A CN201610245925.1A CN201610245925A CN105839165A CN 105839165 A CN105839165 A CN 105839165A CN 201610245925 A CN201610245925 A CN 201610245925A CN 105839165 A CN105839165 A CN 105839165A
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stainless steel
austenite stainless
processing method
stiffness
layer
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CN105839165B (en
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孙耀明
陈寿
彭晓华
周祎
张玲
李明雨
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SHENZHEN 863 NEW MATERIAL TECHNOLOGY Co.,Ltd.
Shenzhen TONGCHAN Lixing Technology Group Co.,Ltd.
Shenzhen Graduate School Harbin Institute of Technology
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SHENZHEN 863 PROGRAM RESEARCH AND DEVELOPMENT CENTER
Shenzhen Graduate School Harbin Institute of Technology
Shenzhen Beauty Star Co Ltd
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    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/34—Anodisation of metals or alloys not provided for in groups C25D11/04 - C25D11/32
    • 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
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    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
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    • 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
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    • 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
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    • C23C8/08—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 gases only one element being applied
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    • 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
    • C23C8/06—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 gases
    • C23C8/08—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 gases only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces
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    • 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
    • C23C8/06—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 gases
    • C23C8/28—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 gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
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    • 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
    • C23C8/06—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 gases
    • C23C8/36—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 gases using ionised gases, e.g. ionitriding
    • C23C8/38—Treatment of ferrous surfaces
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    • 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
    • C23C8/44—Carburising
    • C23C8/46—Carburising of ferrous surfaces
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    • 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
    • C23C8/50—Nitriding of ferrous surfaces
    • 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
    • C23C8/54—Carbo-nitriding
    • C23C8/56—Carbo-nitriding of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/024—Anodisation under pulsed or modulated current or potential

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Abstract

The invention discloses austenitic stainless steel and a treatment method for improving hardness and corrosion resistance. The treatment method comprises steps as follows: A, nitriding, carburizing or nitrocarburizing treatment is performed on an austenitic stainless steel workpiece, and a permeating layer is formed; B, plasma electrochemical treatment is performed on the austenitic stainless steel workpiece in an electrolyte, and a dense oxide layer is formed while the permeating layer is polished; and C, then the austenitic stainless steel workpiece is cleaned and dried. Aftertreatment is performed on the permeating layer on the surface of the austenitic stainless steel through the plasma electrochemical technology, and the corrosion-resistant dense oxide layer is formed on the surface of the permeating layer while an easy-to-corrode layer on the surface is removed, so that both the hardness and the corrosion resistance of the workpiece are improved; besides, the technology has the characteristics of high treatment speed and simplicity and is suitable for large-scale popularization and use.

Description

A kind of austenitic stainless steel and improve hardness and corrosion proof processing method
Technical field
The present invention relates to field of metal surface treatment technology, particularly relate to a kind of austenitic stainless steel and improve hardness and corrosion proof processing method.
Background technology
Corrosion resistance of austenitic stainless steels (i.e. corrosion resistance) is excellent, is widely used in numerous industrial circle, but hardness and wearability are the best, therefore limits its application.It is that the elements such as nitrogen/carbon are penetrated into steel that nitriding/carbon processes, and forms Intensive intervention body, can be obviously enhanced case hardness and wearability, be conventional process for modifying surface.Conventional high temperature oozes treatment temperature higher (more than 550 DEG C), when being used for processing austenitic stainless steel, although can improve workpiece hardness, but chromium nitride or chromium carbide can be caused to separate out, corrosivity significantly reduces.Low temperature ooze process by temperature reduce, high rigidity, corrosion resistant S-phase can be generated, if but process the time short, hardness improve limited；The process time is long, and the S-phase of generation decomposites chromium nitride or chromium carbide in the later stage processes, and causes corrosion resistance to decline.
Chinese patent notification number 1060503(hard austenitic stainless steel screw and preparation method thereof), disclose hard formation except being gone by pickling, the corrosion resistance of infiltration layer can be significantly improved, but hardness is reduced to 650HV from 1400HV；Layer surface by 2 oxidations and stock removal polishing technique, is aoxidized so that corrosion resistance significantly promotes, but experiences again 3 techniques after nitriding, and technique is loaded down with trivial details, long processing period after nitriding/carbon by additive method such as Chinese patent notification number CN 101896632A.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of austenitic stainless steel and improve hardness and corrosion proof processing method, it is intended to solving existing processing method and be difficult to improve hardness and the problem such as corrosion resistance and complex treatment process simultaneously.
Technical scheme is as follows:
A kind of raising austenite stainless stiffness and corrosion proof processing method, wherein, including step:
A, austenite stainless steel workpiece is carried out nitriding, carburizing or nitrocarburizing process form infiltration layer；
B, in the electrolytic solution austenite stainless steel workpiece is carried out plasma electrochemical treatments, while infiltration layer is polished, form compact oxidation layer；
C, then austenite stainless steel workpiece is carried out and dries.
Described raising austenite stainless stiffness and corrosion proof processing method, wherein, in described step A, nitriding, carburizing and nitrocarburizing process be ion ooze, gas ooze or liquid ooze in one.
Described raising austenite stainless stiffness and corrosion proof processing method, wherein, in described step A, use nitrocarburizing processing mode, and it ooze for ion.
Described raising austenite stainless stiffness and corrosion proof processing method, wherein, in the electrolyte of plasma electrochemical treatments, by mass percentage, including hexafluoro sodium aluminate 5-10%, calgon 5-20%, disodium ethylene diamine tetraacetate 0.5-2%, neopelex 0.5-2%, NaOH 1-5%, surplus is deionized water.
Described raising austenite stainless stiffness and corrosion proof processing method, wherein, in plasma electrochemical treatments, power supply is Bipolar pulse power, austenite stainless steel workpiece is anode, and graphite is negative electrode, and forward voltage is 600-800V, negative voltage is 50-200V, and current density is 5-20A/dm2, positive frequencies is 500-800 hertz, and negative sense frequency is 200-300 hertz, and forward dutycycle is 15%-40%, and negative sense dutycycle is 8%-20%, and the process time is 0.5-5 minute.
Described raising austenite stainless stiffness and corrosion proof processing method, wherein, in described step A, the thickness of infiltration layer is more than or equal to 10 microns.
Described raising austenite stainless stiffness and corrosion proof processing method, wherein, in described step A, the case hardness of infiltration layer is more than 1200HV.
Described raising austenite stainless stiffness and corrosion proof processing method, wherein, in described step B, the thickness of compact oxidation layer is 0.05-1 micron.
A kind of austenitic stainless steel, wherein, uses method as above to process and obtains.
Beneficial effect: the present invention first forms infiltration layer on austenitic stainless steel surface, the infiltration layer on austenitic stainless steel surface is post-processed by using plasma electrochemical process again, one layer of erosion-resisting compact oxidation layer (i.e. complex oxide film) is formed in layer surface while removing the perishable layer in surface, thus improve hardness and the corrosion resistance of workpiece simultaneously, and it is fast that the technique of the present invention has processing speed, the simple feature of technique, is suitable for large-scale promotion and uses.
Accompanying drawing explanation
Fig. 1 is a kind of flow chart improving austenite stainless stiffness and corrosion proof processing method preferred embodiment of the present invention.
Fig. 2 is the structural representation that austenite stainless that the processing method of the present invention obtains is firm.
Detailed description of the invention
The present invention provides a kind of austenitic stainless steel and improves hardness and corrosion proof processing method, and for making the purpose of the present invention, technical scheme and effect clearer, clear and definite, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, Fig. 1 is a kind of flow chart improving austenite stainless stiffness and corrosion proof processing method preferred embodiment of the present invention, as it can be seen, it includes step:
S1, austenite stainless steel workpiece is carried out nitriding, carburizing or nitrocarburizing process form infiltration layer；
S2, in the electrolytic solution austenite stainless steel workpiece is carried out plasma electrochemical treatments, while infiltration layer is polished, form compact oxidation layer；
S3, then austenite stainless steel workpiece is carried out and dries.
Instant invention overcomes the shortcoming that after austenitic stainless steel processes, hardness is low and corrosion resistance is poor, use plasma electrochemical treatments, austenitic stainless steel infiltration layer is polished and oxidation processes simultaneously, one layer of fine and close combined oxidation layer (i.e. compact oxidation layer) is formed in layer surface, increase substantially the corrosion resistance of infiltration layer, making workpiece have the feature of high rigidity and high corrosion-resistant, and the method processing speed of the present invention is fast, technique is simple.
As shown in Figure 2, in the present invention, process first with nitriding, carburizing or nitrocarburizing, form infiltration layer 20 on austenite stainless steel workpiece 10 surface, strengthen surface of the work hardness and wearability by infiltration layer 20, carry out plasma electrochemical treatments the most again, thus remove the perishable layer (polishing) on infiltration layer 20 surface, erosion-resisting compact oxidation layer 30 can also be generated simultaneously, eventually pass cleaning and drying and processing, the workpiece obtained its be not only provided with higher corrosion resistance, higher hardness can also be had concurrently simultaneously.
Further, in described step S1, nitriding, carburizing and nitrocarburizing process be ion ooze, gas ooze or liquid ooze in one.It is to say, in the present invention, the mode of Nitrizing Treatment can be used to generate infiltration layer 20, and Nitrizing Treatment specifically can use ion to ooze, gas oozes or liquid ooze in one；May be used without the mode of Carburization Treatment and generate infiltration layer 20, and Carburization Treatment specifically can use ion to ooze, gas oozes or liquid ooze in one；Or the mode using nitrocarburizing to process generates infiltration layer 20, and nitrocarburizing process specifically ion can be used to ooze, gas ooze or liquid ooze in one.
In the present invention, preferably processing mode is to use nitrocarburizing processing mode, and it oozes for ion, use nitrocarburizing processing mode, the infiltration layer 20 that can make surface of the work has higher hardness and wearability, this is because nitrogen and carbon can penetrate in steel simultaneously, the Intensive intervention body ultimately formed, have the advantages that hardness is high and wearability is strong.The infiltration layer 20 being additionally formed, its thickness is more than or equal to 10 microns, to guarantee that surface of the work has enough hardness, it is preferred that the case hardness of infiltration layer is more than 1200HV, so that workpiece quality is guaranteed.
Further, in the electrolyte of plasma electrochemical treatments, by mass percentage, including: hexafluoro sodium aluminate 5-10%, calgon 5-20%, disodium ethylene diamine tetraacetate 0.5-2%, neopelex 0.5-2%, NaOH 1-5%, surplus is deionized water.Under conditions of this electrolyte, austenite stainless steel workpiece will not deform, and can process various abnormal workpieces, reduces the requirement to workpiece shapes, and the compact oxidation layer simultaneously generated has higher corrosion resistance, and corrosion resistance is strong.
Further, in plasma electrochemical treatments, power supply is Bipolar pulse power, and austenite stainless steel workpiece is anode, and graphite is negative electrode, and forward voltage is 600-800V, and negative voltage is 50-200V, and current density is 5-20A/dm2, positive frequencies is 500-800 hertz, and negative sense frequency is 200-300 hertz, and forward dutycycle is 15%-40%, and negative sense dutycycle is 8%-20%, and the process time is 0.5-5 minute.Above-mentioned treatment conditions, can improve treatment effeciency and processing speed, and its thickness of compact oxidation layer generated is moderate.
It addition, the thickness of compact oxidation layer is 0.05-1 micron.Described dense oxide layer thickness is the thinnest, then do not reach erosion-resisting effect, if thickness is blocked up, then can extend the process time, improves cost, may affect stainless steel hardness, more preferably 0.3 ~ 0.8 micron.
The present invention also provides for a kind of austenitic stainless steel, and it uses method as above process to obtain.
Embodiment 1
A kind of austenitic stainless steel high rigidity high corrosion-resistant processing method, comprises the steps of
(1) austenitic stainless steel is carried out glow discharge nitriding, alloying layer thickness 10 microns, case hardness 1200HV；
(2) workpiece carrying out plasma electrochemistry post processing in the electrolytic solution, each component of electrolyte and mass percent be: hexafluoro sodium aluminate 5%, calgon 5%, disodium ethylene diamine tetraacetate 0.5%, neopelex 0.5%, NaOH 1%, surplus is deionized water；Using Bipolar pulse power, workpiece is anode, and graphite is negative electrode, and forward voltage is 600V, and negative voltage is 50V, and current density is 5A/dm2, positive frequencies is 500 hertz, and negative sense frequency is 200 hertz, and forward dutycycle is 15%, and negative sense dutycycle is 8%, and the process time is 0.5 minute.Dense oxide layer thickness is 0.05 micron；
(3) cleaning, drying.
Workpiece after process, case hardness 1200HV, the neutral salt spray time is more than 200h.
Embodiment 2:
A kind of austenitic stainless steel high rigidity high corrosion-resistant processing method, comprises the steps of:
(1) austenitic stainless steel is carried out gas carburizing, alloying layer thickness 20 microns, case hardness 1200HV；
(2) workpiece carrying out plasma electrochemistry post processing in the electrolytic solution, each component of electrolyte and mass percent be: hexafluoro sodium aluminate 7%, calgon 10%, disodium ethylene diamine tetraacetate 1%, neopelex 1%, NaOH 2%, surplus is deionized water；Using Bipolar pulse power, workpiece is anode, and graphite is negative electrode, and forward voltage is 700V, and negative voltage is 100V, and current density is 10A/dm2, positive frequencies is 600 hertz, and negative sense frequency is 250 hertz, and forward dutycycle is 25%, and negative sense dutycycle is 15%, and the process time is 2 minutes.Dense oxide layer thickness is 0.5 micron；
(3) cleaning, drying.
Workpiece after process, case hardness 1200HV, the neutral salt spray time is more than 300h.
Embodiment 3:
A kind of austenitic stainless steel high rigidity high corrosion-resistant processing method, comprises the steps of:
(1) austenitic stainless steel is carried out salt bath nitrocarburizing, alloying layer thickness 30 microns, case hardness 1300HV；
(2) workpiece carrying out plasma electrochemistry post processing in the electrolytic solution, each component of electrolyte and mass percent be: hexafluoro sodium aluminate 10%, calgon 20%, disodium ethylene diamine tetraacetate 2%, neopelex 2%, NaOH 5%, surplus is deionized water；Using Bipolar pulse power, workpiece is anode, and graphite is negative electrode, and forward voltage is 800V, and negative voltage is 200V, and current density is 20A/dm2, positive frequencies is 800 hertz, and negative sense frequency is 300 hertz, and forward dutycycle is 40%, and negative sense dutycycle is 20%, and the process time is 5 minutes.Dense oxide layer thickness is 1 micron；
(3) cleaning, drying.
Workpiece after process, case hardness 1300HV, the neutral salt spray time is more than 400h.
Embodiment 4:
A kind of austenitic stainless steel high rigidity high corrosion-resistant processing method, comprises the steps of:
(1) austenitic stainless steel is carried out ionitrocarburizing, alloying layer thickness 40 microns, case hardness 1400HV；
(2) workpiece carrying out plasma electrochemistry post processing in the electrolytic solution, each component of electrolyte and mass percent be: hexafluoro sodium aluminate 10%, calgon 20%, disodium ethylene diamine tetraacetate 2%, neopelex 2%, NaOH 5%, surplus is deionized water；Using Bipolar pulse power, workpiece is anode, and graphite is negative electrode, and forward voltage is 800V, and negative voltage is 200V, and current density is 20A/dm2, positive frequencies is 800 hertz, and negative sense frequency is 300 hertz, and forward dutycycle is 40%, and negative sense dutycycle is 20%, and the process time is 5 minutes.Dense oxide layer thickness is 1 micron；
(3) cleaning, drying.
Workpiece after process, case hardness 1400HV, the neutral salt spray time is more than 400h.
In sum, the present invention first forms infiltration layer on austenitic stainless steel surface, the infiltration layer on austenitic stainless steel surface is post-processed by using plasma electrochemical process again, one layer of erosion-resisting compact oxidation layer is formed in layer surface while removing the perishable layer in surface, thus improve hardness and the corrosion resistance of workpiece simultaneously, and it is fast that the technique of the present invention has processing speed, the simple feature of technique, it is suitable for large-scale promotion and uses.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, all these modifications and variations all should belong to the protection domain of claims of the present invention.

Claims (9)

1. one kind is improved austenite stainless stiffness and corrosion proof processing method, it is characterised in that include step:
A, austenite stainless steel workpiece is carried out nitriding, carburizing or nitrocarburizing process form infiltration layer；
B, in the electrolytic solution austenite stainless steel workpiece is carried out plasma electrochemical treatments, while infiltration layer is polished, form compact oxidation layer；
C, then austenite stainless steel workpiece is carried out and dries.
Raising austenite stainless stiffness the most according to claim 1 and corrosion proof processing method, it is characterised in that in described step A, nitriding, carburizing and nitrocarburizing process be ion ooze, gas ooze or liquid ooze in one.
Raising austenite stainless stiffness the most according to claim 2 and corrosion proof processing method, it is characterised in that in described step A, use nitrocarburizing processing mode, and it oozes for ion.
Raising austenite stainless stiffness the most according to claim 1 and corrosion proof processing method, it is characterized in that, in the electrolyte of plasma electrochemical treatments, by mass percentage, including hexafluoro sodium aluminate 5-10%, calgon 5-20%, disodium ethylene diamine tetraacetate 0.5-2%, neopelex 0.5-2%, NaOH 1-5%, surplus is deionized water.
Raising austenite stainless stiffness the most according to claim 1 and corrosion proof processing method, it is characterized in that, in plasma electrochemical treatments, power supply is Bipolar pulse power, austenite stainless steel workpiece is anode, and graphite is negative electrode, and forward voltage is 600-800V, negative voltage is 50-200V, and current density is 5-20A/dm2, positive frequencies is 500-800 hertz, and negative sense frequency is 200-300 hertz, and forward dutycycle is 15%-40%, and negative sense dutycycle is 8%-20%, and the process time is 0.5-5 minute.
Raising austenite stainless stiffness the most according to claim 1 and corrosion proof processing method, it is characterised in that in described step A, the thickness of infiltration layer is more than or equal to 10 microns.
Raising austenite stainless stiffness the most according to claim 1 and corrosion proof processing method, it is characterised in that in described step A, the case hardness of infiltration layer is more than 1200HV.
Raising austenite stainless stiffness the most according to claim 1 and corrosion proof processing method, it is characterised in that in described step B, the thickness of compact oxidation layer is 0.05-1 micron.
9. an austenitic stainless steel, it is characterised in that use the method as described in any one of claim 1 ~ 8 to process and obtain.
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CN109536880A (en) * 2019-01-29 2019-03-29 东北大学 A kind of method of melten salt electriochemistry method to stainless steel surface nitriding or carbo-nitriding
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CN110117766A (en) * 2018-02-05 2019-08-13 尤尼罗库株式会社 The manufacturing method of sealing component and metal block based on this
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CN106756762A (en) * 2016-12-22 2017-05-31 青岛农业大学 A kind of preparation method of the austenitic stainless steel blade blade of fruit juice mixer 304
CN106637065A (en) * 2017-03-14 2017-05-10 蚌埠奥特压缩机有限公司 Method for protecting ammonia compressor parts against corrosion
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CN110117766A (en) * 2018-02-05 2019-08-13 尤尼罗库株式会社 The manufacturing method of sealing component and metal block based on this
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CN109763092A (en) * 2018-12-24 2019-05-17 钢铁研究总院 A kind of surface treatment method enhancing oil gas fracturing unit truck pump housing corrosion-proof wear
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CN111118443A (en) * 2019-12-17 2020-05-08 武汉铭高新材料有限公司 Method for preparing metal ceramic coating on austenitic stainless steel surface
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