CN1015915B - Reinforcement method of steel surface - Google Patents
Reinforcement method of steel surfaceInfo
- Publication number
- CN1015915B CN1015915B CN 88102397 CN88102397A CN1015915B CN 1015915 B CN1015915 B CN 1015915B CN 88102397 CN88102397 CN 88102397 CN 88102397 A CN88102397 A CN 88102397A CN 1015915 B CN1015915 B CN 1015915B
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- Prior art keywords
- steel
- corrosion
- treatment
- temperature
- resisting performance
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Abstract
The present invention relates to a method for the reinforcement treatment of the steel surface comprising nitrocarbonization or nitridation and chemical deposition nickel-base alloy. Through the reasonable combination of a process, the corrosion resisting performance and the abrasion resisting performance of steel parts after treatment are more than 4 times higher than the corrosion resisting performance and the abrasion resisting performance of the existing treatment method. The present invention is suitable for the surface treatment of easily deformed steel parts with various shapes, and has the advantages of simple processes and low cost, and has prospects generally popularized and applied.
Description
The present invention relates to metal or with the method for metallic surface multistep processes chemistry or physical treatment.
For improving steel surface corrosion-proof wear performance, following treatment process commonly used:
Add the oxidation processing after adopting low-temperature nitrocarburizing thermal treatment.Steel-iron components forms a ε-phase white layer at piece surface after low-temperature nitrocarburizing thermal treatment.There is a tectorium that easily is corroded in the white layer surface, and its thickness depends on treatment temp and treatment time, and temperature is high more, the time is long more, and formed tectorium is thick more.This ε-phase white layer that contains tectorium began to occur rust spot through 14～17 hours under standard salt fog test conditions.Carry out oxide treatment behind low-temperature nitrocarburizing immediately, then piece surface forms an oxide skin, can improve the corrosion-proof wear performance of part, under standard salt fog test conditions, begins to occur rust spot through 36～40 hours.But because the limitation of tectorium constructional feature and oxidizing process, the fluff of piece surface " peak valley " shape still exists, and has limited the further raising of part corrosion-proof wear performance.
The compounding method of carbonitriding-oxidation-mechanical polishing/electropolishing-reoxidize also claims the NQPQ method.Through the part of this Combined Processing, the tectorium of its ε-phase surface is fully eliminated, and surface smoothness greatly improves, and has good corrosion-proof wear performance, under standard salt fog test conditions, through just occurring rust spot in 70～80 hours.The major defect of this compounding method is the tired lock of complex process, and is not suitable for the complex-shaped part of processing.
Chemical depositing nickelio alloy technology.Adopt chemical deposition at piece surface deposition one deck nickel-base alloy, be applicable to the part of different shape, overlay coating thickness is even, and solidity to corrosion is better than austenitic stainless steel; The surface hardness height, if by suitable thermal treatment, microhardness can reach about HV1000, has good wear resistance.But, use this technology lining steel-iron components, its effect is unsatisfactory, and reason is coating as thin as a wafer, is about 5～10 μ m, and it is limited that it covers stopping property, and corrosive medium can pass through coating " micropore " corrosion steel-iron components matrix, and corrosion resisting property improves limited.If increase thickness of coating, as reach 20 μ m, can further improve solidity to corrosion, but part is under the repeated stress effect, thick coating peels off easily, improves processing cost simultaneously.
Task of the present invention is to provide a kind of technology simple, the reinforcement method of steel surface of corrosion-proof wear excellent performance.
This treatment process adopts the combination successively of following technology:
A, low-temperature nitrocarburizing thermal treatment or nitriding;
B, piece surface clean and activation;
C, chemical depositing nickelio alloy.
Ultimate principle: after the low-temperature nitrocarburizing thermal treatment that the steel-iron components process is used always, the surface forms a ε-phase white layer, " peak valley " shape tectorium of white layer surface existence; Adopt the common chemical sedimentation, the peak valley shape tectorium that utilizes the surface to exist, the nickel base alloy layer that deposition one deck can be combined closely with tectorium; For making chemical deposition process performance best effect, must the steel-iron components after the low-temperature nitrocarburizing thermal treatment be cleaned and activate.
Fig. 1 is the surface topography map of steel-iron components after this intensive treatment, 1-matrix among the figure, 2-ε-phase layer, 3-key coat, 4-electroless plating layer.
Above-mentioned nitrocarburizing or nitridation technique comprise gas method, salt bath method and ion-nitridation method, and temperature commonly used is 500～690 ℃.
Above-mentioned chemical depositing nickelio alloy comprises Chemical Deposition of Nickel-Phosphorous Alloy and chemical deposition ni-b alloy. Deposition is preferably in the acid coating bath carries out, and contains NiCl in every 1000ml aqueous solution2Or NiSO410～50g, optimum value is 20～30g, pH value is 4.0～5.0. Thickness of coating 5～15 μ m, or decide as required.
Cleaning and the activation of part may further comprise the steps:
I, being 10～30% the HCl aqueous solution with concentration, is 50～70 ℃ of lower cleanings 0.5～3 minute in temperature;
II, clear water rinsing;
III, being about 20% the HCl aqueous solution with concentration, is under 80～90 ℃ in temperature, floods for 3 seconds;
IV, clear water rinsing fast;
V, to insert pH value be 4.0～5.0 acidic chemical sedimentation tank.
Reinforcement method of steel surface of the present invention, its advantage is:
1, the NQPQ method with complex process compares, and the corrosion-proof wear performance is high more than 4 times; Compare with single low-temperature nitrocarburizing or single chemical depositing nickelio alloy technology, can produce beyond thought corrosion-proof wear effect.
2, applied widely, comprise complex-shaped and part easy deformation;
3, easy and simple to handle, with low cost, contained process maturation is easily applied.
Embodiment 1:
Workpiece: 20
#The steel test piece.
600 ℃ of urea gas nitrocarburizings 2 hours;
Immerse 60 ℃, 4 seconds of 1 minute → clear water of 10%HCl aqueous solution rinsing → 80 ℃ of immersions, the 20%HCl aqueous solution → clear water rinsing → insert coating bath;
Plating bath: contain NiSO in per 1000 aqueous solution
427g, inferior sodium phosphate 20g, sodium-acetate 10g, trisodium citrate 10g, 82 ℃ of temperature, pH value 4.5, lining 30 minutes, thickness of coating 5～9 μ m.
Friction amount 1.1 under standard salt fog condition, spot corrosion appearred, in the workpiece after the processing after 314 hours.
Embodiment 2:
Workpiece: the drain valve valve seat that the 40Cr steel is made;
590 ℃ of following low-temperature nitrocarburizings 2.5 hours;
It is identical with embodiment 1 to clean activating process;
Plating bath: NiCl
222g/l, inferior sodium phosphate 21g/l, 85 ℃ of temperature, pH value 4.5; The lining time is 30 minutes, and lining thickness is 10～15 μ m.
Workpiece after the processing under standard salt fog condition, began to occur spot corrosion after 325 hours.Be made as part with ordinary steel, after handling with present method, can replace stainless steel to use.
Each lists in table 1 and table 2 about correlation data:
Table 1 corrosion resistance characteristic
Material processing technology appearance standard salt-fog test etch state
(hour)
20
#14 spot corrosion of 600 ℃ of carbonitriding 2h of steel black
20
#Steel Ni-P deposits silvery white 16 spot corrosion of 15 μ m
20
#70 spot corrosion of steel NQPQ black
20
#Steel embodiment 1 silvery white 314 above spot corrosion
20
#Steel carbonitriding+oxidation black 15 spot corrosion
15 spot corrosion of 600 ℃ of carbonitriding 2h of 40Cr black
40Cr Ni-P deposits silvery white 16 spot corrosion of 15 μ m
75 spot corrosion of 40Cr NQPQ black
40Cr carbonitriding+oxidation black 38 spot corrosion
2Cr13 // 19 spot corrosion
Table 2 wear resistance
Material 20
#Steel 20
#Steel 45
#Steel 38CrMoAl 38CrMoAl
Treatment process embodiment 1 carburizing and quenching carbonitriding ion nitriding gas nitriding
Abrasion loss
1×10
-4g 1.1 7.2 7.0 5.1 4.2
Annotate: 1, wearing and tearing are carried out on pin disc type wear testing machine, load 0.2MPa, and wearing and tearing are apart from 1400m.
2, carburizing temperature is 930 ℃, time 2h.
3, the carbonitriding temperature is 600 ℃, time 2h.
4,520 ℃ of ion nitriding temperature, time 4h.
5,520 ℃ of gas nitriding temperature, time 70h.
Claims (1)
1, a kind of reinforcement method of steel surface comprises low-temperature nitrocarburizing or nitriding heat treatment process, and chemical depositing nickelio alloy technology is characterized in that adopting the combination successively of following technology:
A, low-temperature nitrocarburizing thermal treatment or nitriding;
B, piece surface clean and activation;
C, chemical depositing nickelio alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88102397 CN1015915B (en) | 1988-04-23 | 1988-04-23 | Reinforcement method of steel surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88102397 CN1015915B (en) | 1988-04-23 | 1988-04-23 | Reinforcement method of steel surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1031573A CN1031573A (en) | 1989-03-08 |
| CN1015915B true CN1015915B (en) | 1992-03-18 |
Family
ID=4832147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88102397 Expired CN1015915B (en) | 1988-04-23 | 1988-04-23 | Reinforcement method of steel surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015915B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312315C (en) * | 2004-08-11 | 2007-04-25 | 德阳市佳和机电设备有限公司 | Process for surface treatment of alloy roller and its mfg. method |
| CN101435065B (en) * | 2007-11-15 | 2010-12-01 | 冯俊杰 | Low temperature rare earth catalytic cementation soft nitriding processing technology for high speed steel mould |
| FR3049883B1 (en) * | 2016-04-12 | 2018-05-04 | Safran | HOT-CONFORMATION CORE OF A METAL PART AND METHOD OF MANUFACTURE |
-
1988
- 1988-04-23 CN CN 88102397 patent/CN1015915B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1031573A (en) | 1989-03-08 |
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