CN101597781A - A kind of high hardness nodular iron piston ring chromium plating process - Google Patents
A kind of high hardness nodular iron piston ring chromium plating process Download PDFInfo
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- CN101597781A CN101597781A CNA2009100325553A CN200910032555A CN101597781A CN 101597781 A CN101597781 A CN 101597781A CN A2009100325553 A CNA2009100325553 A CN A2009100325553A CN 200910032555 A CN200910032555 A CN 200910032555A CN 101597781 A CN101597781 A CN 101597781A
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- piston ring
- high hardness
- chromium plating
- nodular iron
- iron piston
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Abstract
The invention discloses a kind of high hardness nodular iron piston ring chromium plating process, comprise the steps: clamping; Sandblast; Clean before the plating; Anti-carve processing; Ultrasonic cleaning; Just plate; Go out the groove rinsing; Unloading clip.Method operation and control by technology of the present invention, in ten rings of different plating tanks time, extract 20 bonding strength tests that twist more than 90 °, all do not find chromium layer obscission from the matrix, KV4 magnesium iron ring chromium plating yield rate reaches 99.1% index request; Need not to increase equipment configuration and personnel, only need to improve operation control and add two class additives, promptly solved the problem of KV4 material magnesium iron ring chromium coating poor bonding strength; Compare the complicated requirement of no singularity with protocorm iron ring chrome-plating scheme; High hardness nodular iron ring chromium coating anticreep technology is one of technical bottleneck of high hardness nodular iron ring exploitation most critical, the invention solves the chromium plating of KV4 magnesium iron ring and produces problem in batches.
Description
Technical field
The present invention relates in a kind of process for treating surface, is a kind of bonding strength method that improves the higher nodular iron piston ring chromium plating layer of matrix hardness specifically.
Background technology
Along with engine develops to high-power, high rotating speed, high loading direction, the piston ring of exploitation high rigidity spheroidal graphite cast iron material, the wear resistance, the shock-resistance that improve piston ring are one of problems of piston ring industry research.The difficult problem of chromium plating bonding force difference---high hardness nodular iron ring (KV4:HRB=112-117) is in chromium plating is produced and run in the performance history of high hardness nodular iron piston ring, adopt protocorm iron hoop (KV1:HRB=104-112) chromium plating scheme, though the chromium layer can better deposit, but the bonding strength that sampling is twisted more than 90 ° detects, find obviously to have chromium layer obscission from the matrix, had a strong impact on the processed finished products rate of KV4 piston ring.KV4, KV1 are the trade mark standards of European spheroidal graphite cast iron, wherein KV8 be equivalent to China the trade mark be the spheroidal graphite cast iron of NHC-8, KV1 be equivalent to China the trade mark be the spheroidal graphite cast iron of NHC-7.
Summary of the invention
Goal of the invention: the objective of the invention is to solve above-mentioned problems of the prior art, a kind of high hardness nodular iron piston ring chromium plating process is provided, it can prevent effectively that chromium coating from coming off.
Thinking of the present invention is: in conjunction with the high characteristic of KV4 material piston ring matrix hardness, magnesium iron ring chromium plating principle is analyzed, decision directly adds fluorine-containing inorganic additives and organic sulfonic acid additive in anti-carving solution and positive plating liquor, and increasing anti-carves current density.By the adding of above-mentioned two kinds of additives and the control of amount, and the control that anti-carves electric current, can controlled fully and prevention to KV4 high hardness nodular iron piston ring chromium plating layer bonding strength.
Technical scheme: in order to solve the problems of the technologies described above, the present invention has adopted following method: a kind of nodular iron piston ring chromium plating process comprises the steps:
(1) clamping: the nodular iron piston ring that will process before will the plating chromium plating frock of packing into, and install frock galvanic protection cover;
(2) sandblast;
(3) clean before the plating;
(4) anti-carve processing: groove temperature: 58-62 ℃, anti-carve current density: 40-45A/dm
2, the treatment time: 50-60S; Contain following component: CrO in every liter of tank liquor
3: 180-220g, H
2SO
4: 1.4-2.0g, Cr
3+: 1-5g, fluorine-containing inorganic additives: 3-7g, organic sulfonic acid additive: 12-15ml;
(5) ultrasonic cleaning: groove temperature: 58-62 ℃, the treatment time: 2-2.5min; Contain following component: CrO in every liter of tank liquor
3: 140-160g, H
2SO
4: 1.2-1.6g, Cr
3+: 1-4g;
(6) just plate: groove temperature: 58-62 ℃, current density: 60-65A/dm2, treatment time: 2 hours 30 minutes-3 hours 20 minutes, contain following component: CrO in every liter of tank liquor
3: 80-220g, H
2SO
4: 1.4-2.0g, Cr
3+: 1-5g, fluorine-containing inorganic additives: 3-7g, organic sulfonic acid additive: 12-15ml;
(7) go out the groove rinsing;
(8) unloading clip.
The trade mark of the magnesium iron that the nodular iron piston ring described in the step (1) is used is NHC-8.
Related parameter is arranged: 150-180 order white fused alumina sand in the step (2); Air pressure: 0.6-0.8Mpa; Sand water ratio: 10-15% (V/V); Workpiece rotational frequency: 36 rev/mins; Spray gun translational speed: 245mm/min; Spray angle: 75-85 °; Sandblast 2 times.
The sand grains that will be attached to ring surface with flowing water in the step (3) cleans up.
Fluorine-containing inorganic additives described in step (4), the step (6) is Potassium monofluoride or Sodium Fluoride.
Organic sulfonic acid additive described in step (4), the step (6) is a methanesulfonic.
Beneficial effect: (1) is by the method operation and the control of technology of the present invention, in ten rings of different plating tanks time, extract 20 bonding strength tests that twist more than 90 °, all do not find chromium layer obscission from the matrix, KV4 magnesium iron ring chromium plating yield rate reaches 99.1% index request.(2) need not to increase equipment configuration and personnel, only need to improve operation control and add two class additives, can solve the problem of KV4 material magnesium iron ring chromium coating poor bonding strength.(3) in the operation, compare the complicated requirement of no singularity with protocorm iron ring chrome-plating scheme.(4) high hardness nodular iron ring chromium coating anticreep technology is one of technical bottleneck of high hardness nodular iron ring exploitation most critical, the enforcement of this invented technology, solved the chromium plating of KV4 magnesium iron ring and produced problem in batches, for company's product enters high-power, high rotating speed, solid foundation has been laid in high load engine market.
Embodiment:
According to following embodiment, can better understand the present invention.Yet, those skilled in the art will readily understand that the described concrete material proportion of embodiment, processing condition and result thereof only are used to illustrate the present invention, and should also can not limit the present invention described in detail in claims.
Embodiment 1:
With the trade mark is the high-strength spheroidal graphite cast iron manufacturing piston ring of NHC-8, and it is flat to be applied to tin bavin 4DF3 (￠ 110) ball wedge chromium, requires: chromium layer thickness 0.15-0.19mm
1, clamping: the piston ring that will process before will the plating chromium plating frock of packing into, and install frock galvanic protection cover;
2, sandblast: install conductive cap, ring is hung on wet sand blast machine drive plate, press button; Related parameter is arranged: 150 order white fused alumina sand; Air pressure: 0.6Mpa; Sand water ratio: 10% (V/V); Workpiece rotational frequency: 36 rev/mins; Spray gun translational speed: 245mm/min; Spray angle: 75 °; Sandblast 2 times (a upper and lower stroke for once);
3, clean before the plating: the sand grains that will be attached to ring surface with tap water cleans up;
4, anti-carve processing: the groove temperature: 58 ℃, contrary electric current density: 40A/dm
2, the treatment time: 60S
Contain following component: CrO in every liter of tank liquor
3: 180g, H
2SO
4: 1.4g, Cr
3+: 1g, Potassium monofluoride: 3g, methanesulfonic: 12ml;
5, ultrasonic cleaning: groove temperature: 58 ℃, treatment time: 2.5min,
Contain following component: CrO in every liter of tank liquor
3: 140g, H
2SO
4: 1.2g, Cr
3+: 1g;
6, just plate: the groove temperature: 58 ℃, current density: 60A/dm
2, the treatment time: 2h40min;
Contain following component: CrO in every liter of tank liquor
3: 180g/, H
2SO
4: 1.4g, Cr
3+: 1g, Potassium monofluoride: 3g, methanesulfonic: 12ml;
7, go out the groove rinsing;
8, unloading clip.
The chromium layer is carried out in 20 of the chrome plated piston ring extractions of embodiment 1 gained to be detected: chromium layer mean thickness 0.171mm, chromium plating speed 0.064mm/h; Chromium layer average hardness 952HV0.1; The bonding strength test of distortion more than 90 ° do not find that all the chromium layer is from the matrix obscission.
Embodiment 2: technology is with embodiment 1, and different is: the fluorine-containing inorganic additives in the step 4 is a Potassium monofluoride, contains 4.5g in every liter of tank liquor; Fluorine-containing inorganic additives in the step 6 is a Sodium Fluoride, contains 4.5g in every liter of tank liquor.
Embodiment 3:
With the trade mark is the high-strength spheroidal graphite cast iron manufacturing piston ring of NHC-8, and it is flat to be applied to big bavin CA4DD (￠ 98) ball wedge chromium, requires: chromium layer thickness 0.15-0.19mm
1, clamping: the piston ring that will process before will the plating chromium plating frock of packing into, and install frock galvanic protection cover;
2, sandblast: install conductive cap, ring is hung on wet sand blast machine drive plate, press button; Related parameter is arranged: 180 order white fused alumina sand; Air pressure: 0.8Mpa; Sand water ratio: 15% (V/V); Workpiece rotational frequency: 36 rev/mins; Spray gun translational speed: 245mm/min; Spray angle: 85 °; Sandblast 2 times (a upper and lower stroke for once);
3, clean before the plating: the sand grains that will be attached to ring surface with tap water cleans up;
4, anti-carve processing: the groove temperature: 62 ℃, contrary electric current density: 45A/dm
2, the treatment time: 50S;
Contain following component: CrO in every liter of tank liquor
3: 220g, H
2SO
4: 2.0g, Cr
3+: 5g, Sodium Fluoride: 7g, methanesulfonic: 15ml;
5, ultrasonic cleaning: groove temperature: 62 ℃, treatment time 2min;
Contain following component: CrO in every liter of tank liquor
3: 60g, H
2SO
4: 1.6g, Cr
3+: 4g;
6, just plate: the groove temperature: 62 ℃, current density: 65A/dm
2, the treatment time: 2h40min;
Contain following component: CrO in every liter of tank liquor
3: 220g, H
2SO
4: 2.0g, Cr
3+: 5g, Sodium Fluoride: 7g, methanesulfonic: 15ml;
7, go out the groove rinsing;
8, unloading clip.
The chromium layer is carried out in 20 of the chrome plated piston ring extractions of embodiment 3 gained to be detected: chromium layer mean thickness 0.175mm; Chromium plating speed 0.0655mm/h; Chromium layer average hardness 956HV0.1; The bonding strength test of distortion more than 90 ° do not find that all the chromium layer is from the matrix obscission.
Embodiment 4: technology is with embodiment 3, and different is: the fluorine-containing inorganic additives in the step 4 is a Sodium Fluoride, contains 6g in every liter of tank liquor; Fluorine-containing inorganic additives in the step 6 is a Potassium monofluoride, contains 6g in every liter of tank liquor.
Claims (6)
1, a kind of high hardness nodular iron piston ring chromium plating process is characterized in that comprising the steps:
(1) clamping: the nodular iron piston ring that will process before will the plating chromium plating frock of packing into, and install frock galvanic protection cover;
(2) sandblast;
(3) clean before the plating;
(4) anti-carve processing: groove temperature: 58-62 ℃, anti-carve current density: 40-45A/dm2, treatment time: 50-60S; Contain following component: CrO3:180-220g in every liter of tank liquor, H2SO4:1.4-2.0g, Cr3+:1-5g, fluorine-containing inorganic additives: 3-7g, organic sulfonic acid additive: 12-15m1;
(5) ultrasonic cleaning: groove temperature: 58-62 ℃, the treatment time: 2-2.5min; Contain following component: CrO3:140-160g, H2SO4:1.2-1.6g, Cr3+:1-4g in every liter of tank liquor;
(6) just plate: groove temperature: 58-62 ℃, current density: 60-65A/dm2, treatment time: 2 hours 30 minutes-3 hours 20 minutes, contain following component: CrO3:80-220g in every liter of tank liquor, H2SO4:1.4-2.0g, Cr3+:1-5g, fluorine-containing inorganic additives: 3-7g, organic sulfonic acid additive: 12-15ml;
(7) go out the groove rinsing;
(8) unloading clip.
2, a kind of high hardness nodular iron piston ring chromium plating process according to claim 1, the trade mark of the magnesium iron that it is characterized in that comprising the steps: that the nodular iron piston ring described in the step (1) is used is NHC-8.
3, a kind of high hardness nodular iron piston ring chromium plating process according to claim 1 is characterized in that comprising the steps: that related parameter is arranged in the step (2): 150-180 order white fused alumina sand; Air pressure: 0.6-0.8Mpa; Sand water ratio: 10-15% (V/V); Workpiece rotational frequency: 36 rev/mins; Spray gun translational speed: 245mm/min; Spray angle: 75-85 °; Sandblast 2 times.
4, a kind of high hardness nodular iron piston ring chromium plating process according to claim 1 is characterized in that comprising the steps: in the step (3) that the sand grains that will be attached to ring surface with flowing water cleans up.
5, a kind of high hardness nodular iron piston ring chromium plating process according to claim 1 is characterized in that comprising the steps: that the fluorine-containing inorganic additives described in step (4), the step (6) is Potassium monofluoride or Sodium Fluoride.
6, a kind of high hardness nodular iron piston ring chromium plating process according to claim 1 is characterized in that comprising the steps: that the organic sulfonic acid additive described in step (4), the step (6) is a methanesulfonic.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100325553A CN101597781B (en) | 2009-07-02 | 2009-07-02 | High hardness nodular iron piston ring chromium plating process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100325553A CN101597781B (en) | 2009-07-02 | 2009-07-02 | High hardness nodular iron piston ring chromium plating process |
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| CN101597781A true CN101597781A (en) | 2009-12-09 |
| CN101597781B CN101597781B (en) | 2011-06-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110062819A (en) * | 2016-11-14 | 2019-07-26 | 塔塔钢铁艾默伊登有限责任公司 | Method for using coating layer that uncoated steel band is electroplated |
| CN113584548A (en) * | 2021-08-04 | 2021-11-02 | 长沙正圆动力科技有限责任公司 | Composite plating process for chromium-base ceramic of piston ring |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5196108A (en) * | 1991-04-24 | 1993-03-23 | Scot Industries, Inc. | Sucker rod oil well pump |
| CN100344797C (en) * | 2004-09-20 | 2007-10-24 | 南京飞燕活塞环股份有限公司 | Ball iron ring chrome-plating technology and plating liquid thereof |
-
2009
- 2009-07-02 CN CN2009100325553A patent/CN101597781B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110062819A (en) * | 2016-11-14 | 2019-07-26 | 塔塔钢铁艾默伊登有限责任公司 | Method for using coating layer that uncoated steel band is electroplated |
| CN110062819B (en) * | 2016-11-14 | 2021-07-23 | 塔塔钢铁艾默伊登有限责任公司 | Method for electroplating uncoated steel strip with a coating |
| CN113584548A (en) * | 2021-08-04 | 2021-11-02 | 长沙正圆动力科技有限责任公司 | Composite plating process for chromium-base ceramic of piston ring |
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| CN101597781B (en) | 2011-06-29 |
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