CN103276346B - A kind for the treatment of process of metal bearing retainer - Google Patents
A kind for the treatment of process of metal bearing retainer Download PDFInfo
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- CN103276346B CN103276346B CN201310169394.9A CN201310169394A CN103276346B CN 103276346 B CN103276346 B CN 103276346B CN 201310169394 A CN201310169394 A CN 201310169394A CN 103276346 B CN103276346 B CN 103276346B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002184 metal Substances 0.000 title claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 19
- 150000003839 salts Chemical class 0.000 claims abstract description 36
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- -1 salt salt Chemical class 0.000 claims abstract description 18
- 239000011780 sodium chloride Substances 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000005034 decoration Methods 0.000 claims abstract description 9
- 238000011084 recovery Methods 0.000 claims abstract description 6
- 230000001502 supplementing effect Effects 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 239000003082 abrasive agent Substances 0.000 claims abstract description 4
- 238000003754 machining Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- 239000010410 layer Substances 0.000 claims description 17
- 238000005121 nitriding Methods 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 125000004432 carbon atom Chemical group C* 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 12
- 230000003647 oxidation Effects 0.000 claims description 11
- 238000007254 oxidation reaction Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 229910052752 metalloid Inorganic materials 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 239000011222 crystalline ceramic Substances 0.000 claims description 8
- 229910002106 crystalline ceramic Inorganic materials 0.000 claims description 8
- 150000002738 metalloids Chemical class 0.000 claims description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 7
- 230000007797 corrosion Effects 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 230000008595 infiltration Effects 0.000 claims description 6
- 238000001764 infiltration Methods 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 4
- 238000000280 densification Methods 0.000 claims description 4
- 230000003628 erosive effect Effects 0.000 claims description 4
- 235000011194 food seasoning agent Nutrition 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- 229910001111 Fine metal Inorganic materials 0.000 claims description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000004202 carbamide Substances 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims description 2
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- 150000004767 nitrides Chemical class 0.000 claims description 2
- 231100000957 no side effect Toxicity 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
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- 238000007514 turning Methods 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims 1
- NKCCODPFBDGPRJ-UHFFFAOYSA-N nitridocarbon(1+) Chemical compound N#[C+] NKCCODPFBDGPRJ-UHFFFAOYSA-N 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 7
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- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 3
- 238000013329 compounding Methods 0.000 description 2
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- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
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- Rolling Contact Bearings (AREA)
Abstract
The invention belongs to Machining Technology field, relate to a kind for the treatment of process of metal bearing retainer, will put into nitrogenize base salt salt bath after retainer preheating, the cyanogen root that nitrogenize base salt high temperature melting exists is by supplementing adjustment salt mode, make it to return to original cyanate radical state, activity recovery; After nitrogenize terminates, retainer is put into after saline oxide salt bath stops and carry out cold water flush; Then retainer put into light decorations or after polissoir mix with abrasive material or light exterior material, vibrating or under rotating state, polished finish is being carried out to retainer surface; Again retainer is put into after saline oxide salt bath stops and carry out cold water flush; Its technological principle is simple, and operating process is flexible, and processing treatment cost is low, and quality is good, the surface soundness of its product and wear resistance good, environmental friendliness.
Description
Technical field:
The invention belongs to Machining Technology field, relate to the compounding method, particularly a kind for the treatment of process of metal bearing retainer of the retainer be made up of metallic substance that a kind of rolling bearing inside uses.
Background technology:
In rolling bearing, retainer is one of indispensable component, retainer guides at Bearing inner, separate rolling body, guide the motion of retainer, separate rolling body simultaneously, prevent from rubbing mutually between rolling body, in bearing rotary process, must produce friction between retainer and rolling body, friction can produce wearing and tearing, and the abrasive dust that wearing and tearing produce can produce serious influence to bearing.Existing rolling bearing structure is varied, and therefore the material of retainer also has a variety of, such as, have ferrous materials, nonferrous materials, engineering plastics etc.Although ferrous materials is compared with other materials, have that frictional coefficient is large, the shortcoming of the aspect such as high, not corrosion-resistant of wearing and tearing, but by many-sided restrictions such as retainer structure, material cost, environments for use, current ferrous materials remains the topmost material that retainer uses.For the shortcoming of existing iron and steel retainer, domestic and international bearing industry takes a lot of measures, such as, carry out nitriding treatment to iron and steel retainer.Patent 201110376525.1 " a kind of nitridation treatment method of mild steel bearing retainer " discloses a solution, adopt nitriding treatment can improve the hardness on steel retainer surface, reduce wear, this patent employs the principle of work of gas nitriding, overcome the shortcoming that cyanogen salt nitriding process raw material is poisonous, in nuisanceless, have improvement greatly, simultaneously quality layer and aspect of performance close to or reach the level of cyanogen salt nitriding.Although triniding makes raw material without cyanogen salt, but be not completely eliminate public hazards, such as, in the waste gas discharged at the triniding of certain endothermic atmosphere, detect hypertoxic prussic acid (HCN), also do not reached emission request even if light at gas discharge outlet; Except pollution problem, mostly there is technique instability in domestic gas nitriding, and quality does not allow manageable problem, and long-term production is easy to produce quality problems.In sum, the nitriding of cyanogen salt is prohibited from using due to pollution problem, although gas nitriding public hazards reduce, does not eliminate pollution problem completely, and the quality of production is unstable simultaneously.
Summary of the invention:
The object of the invention is to the shortcoming overcoming prior art existence, build a kind of steady quality, nuisanceless, the comprehensive steel metal cage treatment process of the corrosion-resistant poor shortcoming of ferrous materials can be overcome to a certain extent, particularly a kind of metal bearing retainer combined type treatment process.
To achieve these goals, technical scheme of the present invention comprises the following steps:
(1), nitriding treatment: salt bath steel bearings retainer being put at 350 ~ 400 DEG C of temperature the nitrogenize base salt of the commercial goods of 550 ~ 600 DEG C after preheating 30 ~ 60min stops 120 ~ 240min, wherein nitrogenize base salt is not containing prussiate, can produce cyanogen root (CN after high temperature melting
-), nitriding is carried out to retainer, forms high abrasion with the Fe of retainer surface matrix and there is the Fe of excellent toughness
3n; Cyanogen root (the CN that nitrogenize base salt high temperature melting exists
-) by supplementing adjustment salt mode, make it to return to original cyanate radical (CNO
-) state, activity recovery, prevents public hazards;
(2), oxide treatment: nitrogenize base salt, by supplementing adjustment salt, can reach harmless treatment, simultaneously can activity recovery, and micro-base salt remaining on steel bearings retainer does not then process by the mode of supplementary adjustment salt; Commercial saline oxide salt bath retainer being put into 380 ~ 420 DEG C after nitrogenize terminates stops 10 ~ 20min, then carries out cold water flush; On saline oxide and retainer trace nitrogenize base salt in cyanogen root (CN
-) there is oxidizing reaction, generate cyanate radical (CNO
-), then use cold water to rinse, cyanogen root (CN in water after rinsing
-) content lower than emission standard requirement, can not to environment;
(3), light decorations or polished finish: after nitrogenize and oxide treatment, retainer surface can generate tectorium, and the hardness of tectorium is lower, and wear resistance is poor, makes retainer surface become rough simultaneously, and roughness raises; Put into by retainer after conventional light decorations or polissoir mix with abrasive material or light exterior material, under vibration or rotating state, carry out polished finish to retainer surface, elimination tectorium is on the impact of retainer surface quality;
(4), oxide treatment again: the retainer corrosion resistance of surface carried out after polishing or the process of light decorations declines, the commercial saline oxide salt bath again retainer being put into 380 ~ 420 DEG C stops 10 ~ 20min, then cold water flush is carried out, oxide treatment rear bearing retainer surface forms fine and close zone of oxidation again, improves the corrosion resistance nature of retainer.
Compared with prior art, its technological principle is simple in the present invention, and operating process is flexible, and processing treatment cost is low, and quality is good, the surface soundness of its product and wear resistance good, environmental friendliness.Accompanying drawing illustrates:
Fig. 1 is compounding method process structure principle schematic of the present invention.
Embodiment:
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail.
Embodiment:
The technical scheme of the present embodiment comprises the following steps:
(1), nitriding treatment: by the preheating in air furnace of steel bearings retainer, oxygen generation oxidizing reaction at 350 ~ 400 DEG C of temperature in its metallic surface and air, generate the oxide compound of iron, oxidation can promote the infiltration of nitrogen in subsequent disposal, is conducive to the formation of nitride; Retainer surface ratio through oxide treatment is darker without the degree of depth of the surfaces nitrided infiltration layer of process; Warm up time is 30 ~ 60min, and long warm up time can form thicker zone of oxidation, unfavorable to subsequent disposal, and preheating also can make retainer appearance uniform consistent, does not produce surface imperfection; Then nitrogenize base salt salt bath steel bearings retainer being put into 550 ~ 600 DEG C stops 150 ~ 240min, adopts the commercialization nitrogenize base salt of J-2U, comprises Li
2cO
3multiple carbonate and the mixture of urea, under high temperature, both synthesis make the cyanate radical (CNO forming more than 30% in its salt bath
-), cyanate radical (CNO at the working temperature
-) decompose, produce activated nitrogen atom and infiltrate metallic surface, form compound layer and diffusion layer, wherein compound layer is Fe
3n or Fe
4n, the CO that cyanate radical decomposition simultaneously produces decomposite carbon atom and infiltrate retainer surface, form carbide or sosoloid; Cyanogen root (the CN that nitrogenize base salt high temperature melting exists
-) by supplementing adjustment salt mode, adjustment salt adopts the commercialization regenerant salt of Z-1, and its main component is organic condensation thing, by CO
3 -2change CNO into
-, make it to return to original cyanate radical (CNO
-) state, activity recovery, prevents public hazards; It is the same that forming process and the common element of retainer infiltration layer in salt bath infiltrate rule, comprises the processes such as decomposition, absorption, diffusion; First be decompose, cyanate radical (CNO
-) under the working temperature of nitrogenize base salt, decomposite active atom N and carbon atom, the height of activated nitrogen atom concentration depends on cyanate radical (CNO in nitrogenize base salt salt bath
-) height of content and the height of nitriding temperature; Next is absorption, and be that activated nitrogen atom and carbon atom adsorb to metallic surface, the concentration of metallic surface nitrogen raises gradually, forms concentration difference with metallic surface, and this concentration difference can impel nitrogen-atoms and carbon atom to spread to metal inside; Be finally diffusion, the radius of the radius ratio iron atom of nitrogen-atoms and carbon atom is little, and nitrogen-atoms and carbon atom spread in the dot matrix gap of iron atom;
(2), oxide treatment: nitrogenize base salt is by supplementing adjustment salt, harmless treatment can be reached, simultaneously can activity recovery, micro-base salt remaining on retainer does not then process by the mode of supplementary adjustment salt, saline oxide salt bath retainer being put into 380 ~ 420 DEG C after nitrogenize terminates stops 10 ~ 20min, adopt the commercialization saline oxide of Y-1, then carry out cold water flush; On saline oxide and retainer trace nitrogenize base salt in cyanogen root (CN
-) there is oxidizing reaction, generate cyanate radical (CNO
-), then use cold water to rinse, cyanogen root (CN in water after rinsing
-) content lower than emission standard requirement, can not to environment, retainer seasoning or dry up after flowing water cleaning; Retainer can form oxide film on surface when being incubated in saline oxide salt bath after the process of nitrogenize operation, and oxide film is the oxide compound (Fe of iron
3o
4), be a kind of black oxide of densification, effectively can improve the erosion resistance of ferrous materials;
(3), light decorations or polished finish: after nitrogenize and oxide treatment, retainer surface can generate tectorium, and the hardness of tectorium is lower, and wear resistance is poor, makes retainer surface become rough simultaneously, and roughness raises; Retainer is put into light decorations or polissoir, after mixing with abrasive material or light exterior material, under vibration or rotating state, polished finish is carried out to retainer surface, eliminate tectorium to the impact of retainer surface quality; Retainer level is put into the container that machining medium is housed, by the turning motion of main shaft and the to-and-fro movement of container, make to produce certain relative movement and interaction force between abrading block and retainer surface, free abrading block produces the micro cutting effect of collision, roll extrusion, swiping and delineation to workpiece surface, realize the deburring to retainer and surface finishing, improve surface quality, improve physical and mechanical property; The nano level ore powder composition powder body material be made up of hydroxy silicate complex component is added between abrading block and retainer, such as trade name is the powder body material of ART, this powder body material is the mixture of multiple natural crystal superfine powder catalyst for additives, have no side effect, Chemical Composition is stablized at normal temperatures; By variety carrier such as oil, grease, water, gas and chemical conversion films by the ART powder conveying of trace to metal friction surface, under the effect of frictional force, carry out hyperfine abrasive while cleaning friction surface, utilize fricative TRANSIENT HIGH TEMPERATURE high pressure and ultra-fine metal worn particle that micro-metallurgical process occurs; Form metalloid pottery at metal friction surface and breed layer, with the continuous expansion of mill spot, final formation metalloid micro-crystalline ceramic protective layer; Whole process be at metal friction surface dynamically, self-regulated saves land, repair constantly, selectively and the frictional wear of conmpensatory psyment metal surface; Along with the continuous formation of metalloid micro-crystalline ceramic layer, wearing and tearing are constantly compensated, friction surface roughness value reduces, the energy that friction is discharged reduces, finally losing selfreparing stopping under thermokinetics condition, metallic rubbing pairs now, by the friction of metal-Metal, changes over the friction of metalloid micro-crystalline ceramic layer-metalloid micro-crystalline ceramic layer; Or adopt conventional surface finishing technology, such as: the novel polishing processing methods such as honing, polishing, superfinishing, barreling, magnetically grinding, extruding, vortical flow processing and injection processing;
(4), oxide treatment again: the retainer surface of carrying out polishing or the process of light decorations, solidity to corrosion declines; Again retainer is put into the saline oxide salt bath identical with step (2) of 380 ~ 420 DEG C, saline oxide adopts Y-1 commodity salt, stops 10 ~ 20min, then carries out cold water flush, retainer seasoning or dry up after flowing water cleaning; Oxide treatment rear bearing retainer surface forms fine and close zone of oxidation again, and zone of oxidation is the oxide compound (Fe of iron
3o
4), be a kind of black oxide of densification, effectively can improve the erosion resistance of ferrous materials; Oxide treatment not only forms zone of oxidation on the surface of workpiece again, but also some Sauerstoffatom dissolves in compound lattice with gap form, makes surface passivation, improves the solidity to corrosion on surface.
Claims (1)
1. a treatment process for metal bearing retainer, is characterized in that comprising the following steps:
(1), nitriding treatment: by the preheating in air furnace of steel bearings retainer, oxygen generation oxidizing reaction at 350 ~ 400 DEG C of temperature in its metallic surface and air, generate the oxide compound of iron, oxidation can promote the infiltration of nitrogen in subsequent disposal, is conducive to the formation of nitride; Retainer surface ratio through oxide treatment is darker without the degree of depth of the surfaces nitrided infiltration layer of process; Warm up time is 30 ~ 60min, and long warm up time can form thicker zone of oxidation, unfavorable to subsequent disposal, and preheating also can make retainer appearance uniform consistent, does not produce surface imperfection; Then nitrogenize base salt salt bath steel bearings retainer being put into 550 ~ 600 DEG C stops 150 ~ 240min, adopts the commercialization nitrogenize base salt of J-2U, comprises Li
2cO
3multiple carbonate and the mixture of urea, under high temperature, both synthesis make the cyanate radical forming more than 30% in its salt bath, and cyanate radical decomposes at the working temperature, produces activated nitrogen atom and infiltrates metallic surface, form compound layer and diffusion layer, wherein compound layer is Fe
3n or Fe
4n, the CO that cyanate radical decomposition simultaneously produces decomposite carbon atom and infiltrate retainer surface, form carbide or sosoloid; The cyanogen root that nitrogenize base salt high temperature melting exists is by supplementing adjustment salt mode, and adjustment salt adopts the commercialization regenerant salt of Z-1, and its composition is organic condensation thing, by CO
3 2-change CNO into
-, make it to return to original cyanate radical state, activity recovery, prevents public hazards; It is the same that forming process and the common element of retainer infiltration layer in salt bath infiltrate rule, comprises decomposition, absorption and diffusion process; First be decompose, cyanate radical is under the working temperature of nitrogenize base salt, and decomposite active atom N and carbon atom, the height of activated nitrogen atom concentration depends on the height of cyanate radical content and the height of nitriding temperature in nitrogenize base salt salt bath; Next is absorption, and be that activated nitrogen atom and carbon atom adsorb to metallic surface, the concentration of metallic surface nitrogen raises gradually, forms concentration difference with metallic surface, and this concentration difference can impel nitrogen-atoms and carbon atom to spread to metal inside; Be finally diffusion, the radius of the radius ratio iron atom of nitrogen-atoms and carbon atom is little, and nitrogen-atoms and carbon atom spread in the dot matrix gap of iron atom;
(2), oxide treatment: saline oxide salt bath retainer being put into 380 ~ 420 DEG C after nitriding treatment terminates stops 10 ~ 20min, adopts the commercialization saline oxide of Y-1, then carries out cold water flush; On saline oxide and retainer trace nitrogenize base salt in cyanogen root generation oxidizing reaction, generate cyanate radical, then cold water is used to rinse, in the rear water of flushing, cyanogen radical content is lower than emission standard requirement, can not to environment, retainer seasoning or dry up after flowing water cleaning; Retainer can form oxide film on surface when being incubated in saline oxide salt bath after the process of nitrogenize operation, and oxide film is the oxide compound Fe of iron
3o
4, be a kind of black oxide of densification, effectively can improve the erosion resistance of ferrous materials;
(3), light decorations or polished finish: after nitrogenize and oxide treatment, retainer is put into light decorations or polissoir, after mixing with abrasive material or light exterior material, under vibration or rotating state, polished finish is carried out to retainer surface, eliminate tectorium to the impact of retainer surface quality; Retainer level is put into the container that machining medium is housed, by the turning motion of main shaft and the to-and-fro movement of container, make to produce certain relative movement and interaction force between abrading block and retainer surface, free abrading block produces the micro cutting effect of collision, roll extrusion, swiping and delineation to workpiece surface, realize the deburring to retainer and surface finishing, improve surface quality, improve physical and mechanical property; The ART powder body material of the nano level ore powder composition be made up of hydroxy silicate component is added between abrading block and retainer, this powder body material is the mixture that multiple natural crystal superfine powder adds catalyzer, have no side effect, Chemical Composition is stablized at normal temperatures; By oil, grease, water, gas and chemical conversion film variety carrier by the ART powder conveying of trace to metal friction surface, under the effect of frictional force, carry out hyperfine abrasive while cleaning friction surface, utilize fricative TRANSIENT HIGH TEMPERATURE high pressure and ultra-fine metal worn particle that micro-metallurgical process occurs; Form metalloid pottery at metal friction surface and breed layer, with the continuous expansion of mill spot, final formation metalloid micro-crystalline ceramic protective layer; Whole process be at metal friction surface dynamically, self-regulated saves land, repair constantly, selectively and the frictional wear of conmpensatory psyment metal surface; Along with the continuous formation of metalloid micro-crystalline ceramic layer, wearing and tearing are constantly compensated, friction surface roughness value reduces, the energy that friction is discharged reduces, finally losing selfreparing stopping under thermokinetics condition, metallic rubbing pairs now, by the friction of metal-Metal, changes over the friction of metalloid micro-crystalline ceramic layer-metalloid micro-crystalline ceramic layer;
(4), oxide treatment again: the saline oxide salt bath identical with step (2) again the retainer after polished finish being put into 380 ~ 420 DEG C, saline oxide adopts Y-1 commodity salt, stop 10 ~ 20min, then cold water flush is carried out, retainer seasoning or dry up after flowing water cleaning; Retainer surface again after oxide treatment forms fine and close zone of oxidation, and zone of oxidation is the oxide compound Fe of iron
3o
4, be a kind of black oxide of densification, effectively can improve the erosion resistance of ferrous materials; Oxide treatment not only forms zone of oxidation on the surface of workpiece again, but also some Sauerstoffatom dissolves in compound lattice with gap form, makes surface passivation, improves the solidity to corrosion on surface.
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|---|---|---|---|
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| KR20110104631A (en) * | 2010-03-17 | 2011-09-23 | 동아대학교 산학협력단 | Colored austenitic stainless steel article and manufacturing method of the same with excellent corrosion resistance and high surface hardness |
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| CN1117122A (en) * | 1994-12-31 | 1996-02-21 | 重庆浦陵机器厂 | Machining technology for engine connecting rod of motor cycle |
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