CN102965695A - Chromium plating process used for valve rod - Google Patents
Chromium plating process used for valve rod Download PDFInfo
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- CN102965695A CN102965695A CN2012104625794A CN201210462579A CN102965695A CN 102965695 A CN102965695 A CN 102965695A CN 2012104625794 A CN2012104625794 A CN 2012104625794A CN 201210462579 A CN201210462579 A CN 201210462579A CN 102965695 A CN102965695 A CN 102965695A
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- valve rod
- chromium
- chromium plating
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- current density
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Abstract
The invention relates to a chromium plating process, and in particular relates to a chromium plating process used for a valve rod. The chromium plating process used for the valve rod comprises the following steps of: sand blasting, comprising the steps of carrying out sand blasting on a processed and moulded valve rod by adopting a sand blasting machine and then washing the valve rod in clear water at the temperature of 60-70 DEG C; etching under the conditions that tank temperature is 55-57 DEG C, current density is 37-39A/dm<2> and time is 43-48s; plating chromium under the conditions that the tank temperature is 45-50 DEG C, current density is 28-30A/dm<2> and time is 2.5-3.5h; and cleaning, namely washing the valve rod plated with chromium in the clear water at the temperature of 75-85 DEG C. The chromium plating process provided by the invention can prevent a chromium coating from dropping, hardness of the chromium coating can be enhanced, and brightness of the coating can be improved.
Description
Technical field
The present invention relates to a kind of chrome-plated process, specifically a kind of chrome-plated process for valve rod.
Background technology
Valve rod is the valve vitals, for transmission, above connects topworks or handle, below directly the band movable valve plug move or rotate, to realize valve switch or regulating effect.Valve rod not still movement parts, stressed member in the valve opening and closing process, and be sealing member, simultaneously, it is subject to impact and the corrosion of medium, also with filler, produces friction.Therefore when the selector valve bar material, must guarantee that it has enough intensity, good impelling strength, resistance to marring, erosion resistance at the temperature of stipulating.Valve rod is consumable accessory, how to increase its machining property and heat treatment performance, is this area research staff's research direction always.In prior art, often by stem surface chromium plating, strengthen the above performance of valve rod, chromium is a kind of micro-bluish silvery white metal, relative atomic mass 51.99, density 6.98～7.21g/cm3, fusing point is 1875～1920 ℃, chromium metal is very easily passivation in air, surface forms one deck passive film as thin as a wafer, thereby demonstrates the character of precious metal.Chromium coating has very high hardness, different with processing condition according to solution composition, and its hardness can change in 400～1200HV very on a large scale.Chromium coating has thermotolerance preferably, and in heating below 500 ℃, its glossiness, hardness have no significant change, and temperature is greater than 500 ℃ and starts oxidation stain, is greater than 700 ℃ of hardness and starts to reduce.The frictional coefficient of chromium coating is little, and particularly dry friction coefficient is minimum in all metals, so chromium coating has good wear resistance.Yet, in prior art, after stem surface chromium plating, its chromium coating easily comes off, chromium coating hardness is not high.
Summary of the invention
Technical problem to be solved by this invention is that the shortcoming existed for above prior art, propose a kind of chrome-plated process for valve rod, can prevent that chromium coating from coming off, and strengthen chromium coating hardness, improves the luminance brightness of coating.
The technical scheme that the present invention solves above technical problem is:
A kind of chrome-plated process for valve rod comprises the following steps:
(i) sandblasting: the valve rod shaped is carried out to sandblasting with sandblast machine, wash in the clear water of 60-70 ℃ after processing;
(ii) etching: groove temperature: 55-57 ℃, current density: 37-39A/dm
2, the time: 43-48s; Contain following component in every liter of etching tank liquor: chromic anhydride CrO
3: 150-165g, sulphur is joined H
2SO
4: 1.1-1.3g, trivalent chromium: 0.5-0.8g, Strontium Sulphate SrSO
4: 20-35g, potassium silicofluoride: 10-15g;
(iii) chromium plating: groove temperature: 45-50 ℃, current density: 28-30A/dm
2, the time: 2.5-3.5h; Contain following component in every liter of chromium plating tank liquor: chromic anhydride CrO
3: 165-175g, sulphur is joined H
2SO
4: 1.5-1.8g, trivalent chromium: 0.5-0.8g, Strontium Sulphate SrSO
4: 25-35g, potassium silicofluoride: 20-25g has, lithium fluoride or Sodium Fluoride: 1-2g, compound rare-earth: 0.1～0.3g;
(iv) clean: the clear water of the valve rod after chromium plating being put into to 75-85 ℃ washs.
Be added with Strontium Sulphate and potassium silicofluoride in chromium plating tank liquor of the present invention, Strontium Sulphate and potassium silicofluoride exist the resolution of precipitate balance separately, and a solubility product constant Ksp is arranged respectively, i.e. [S0 in solution
4 2-] or [SiF
6 2-] concentration is while increasing, corresponding ionic concn product will be greater than solubility product constant, excessive S0
4 2-Or SiF
6 2-Just generate SrS0
4Or K
2SiF
6Precipitate and separate out; On the contrary, [S0 in solution
4 2-] or [SiF
6 2-] concentration is when not enough, the SrS0 in groove
4Or K
2SiF
6Resolution of precipitate, until corresponding ionic concn product is while equaling its solubility product.So, as the temperature of plating solution and concentration one timing of chromic anhydride, [S0 in plating solution
4 2-] or [SiF
6 2-] concentration can regulate automatically by the dissolution precipitation balance, with electroplating process continue do not change.Therefore, the dispersive ability of plating solution of the present invention and covering power are good, the fast advantages such as (50/-m/h) of sedimentation velocity.Add a certain amount of rare earth element and fluorion on the basis of above chromium plating tank liquor, adopt rare earth element can reduce chromic anhydride concentration, widen plating temperature scope (10～50 ℃) and cathode current density scope (5～30A/dm
2), reduce groove and press, improve luminance brightness and the hardness of coating, make chromium plating production realize low temperature, less energy-consumption, the low pollution and high-level efficiency.
The technical scheme that the present invention further limits is:
The aforesaid chrome-plated process for valve rod, compound rare-earth comprises following component: La:38～40% by weight percentage, Ce:10～13%, Y:3～4%, Sc:15～20%, Gd:6～8%, Sm:3～4%, Dy:6～8%, Pr:7～9%, above each component sum is 100%.
The invention has the beneficial effects as follows: valve rod after technique chromium plating of the present invention is carried out to torsion test, and equal end finds that there is the chromium layer and comes off from the valve rod matrix; By hard detection, chromium layer hardness 1150～1200HV, apparently higher than existing chromium plating valve rod chromium layer hardness; Technique of the present invention can reduce the concentration of chromic anhydride, widens the plating temperature scope, and the cathode current density scope, improves luminance brightness and the hardness of coating, makes chromium plating production realize low temperature, less energy-consumption, the low pollution and high-level efficiency.
Embodiment
Embodiment 1
The present embodiment is a kind of chrome-plated process for valve rod, comprises the following steps:
(i) sandblasting: the valve rod shaped is carried out to sandblasting with sandblast machine, wash in the clear water of 60 ℃ after processing;
(ii) etching: groove temperature: 55 ℃, current density: 37A/dm
2, the time: 43s; Contain following component in every liter of etching tank liquor: chromic anhydride CrO
3: 150g, sulphur is joined H
2SO
4: 1.1g, trivalent chromium: 0.5g, Strontium Sulphate SrSO
4: 20g, potassium silicofluoride: 10;
(iii) chromium plating: groove temperature: 45 ℃, current density: 28A/dm
2, the time: 2.5h; Contain following component in every liter of chromium plating tank liquor: chromic anhydride CrO
3: 165g, sulphur is joined H
2SO
4: 1.5g, trivalent chromium: 0.5g, Strontium Sulphate SrSO
4: 25g, potassium silicofluoride: 20g, lithium fluoride or Sodium Fluoride: 1-2g, compound rare-earth: 0.1～0.3g; Described compound rare-earth comprises following component: La:38%, Ce:13%, Y:4%, Sc:18%, Gd:8%, Sm:4%, Dy:6%, Pr:9% by weight percentage;
(iv) clean: the clear water of the valve rod after chromium plating being put into to 75 ℃ washs.
Valve rod after the present embodiment chromium plating is carried out to the above bonding strength test of distortion 90 degree, and equal end finds that there is the chromium layer and comes off from the valve rod matrix; By hard detection, chromium layer hardness 1185HV, apparently higher than existing chromium plating valve rod chromium layer hardness.
Embodiment 2
The present embodiment is a kind of chrome-plated process for valve rod, comprises the following steps:
(i) sandblasting: the valve rod shaped is carried out to sandblasting with sandblast machine, wash in the clear water of 65 ℃ after processing;
(ii) etching: groove temperature: 56 ℃, current density: 38A/dm
2, the time: 45s; Contain following component in every liter of etching tank liquor: chromic anhydride CrO
3: 160g, sulphur is joined H
2SO
4: 1.2g, trivalent chromium: 0.7g, Strontium Sulphate SrSO
4: 30g, potassium silicofluoride: 13g;
(iii) chromium plating: groove temperature: 48 ℃, current density: 29A/dm
2, the time: 3h; Contain following component in every liter of chromium plating tank liquor: chromic anhydride CrO
3: 170g, sulphur is joined H
2SO
4: 1.7g, trivalent chromium: 0.6g, Strontium Sulphate SrSO
4: 30g, potassium silicofluoride: 23g, lithium fluoride or Sodium Fluoride: 1.5g, compound rare-earth: 0.2g; Described compound rare-earth comprises following component: La:40%, Ce:12%, Y:3%, Sc:20%, Gd:6%, Sm:3%, Dy:8%, Pr:8% by weight percentage;
(iv) clean: the clear water of the valve rod after chromium plating being put into to 80 ℃ washs.
Valve rod after the present embodiment chromium plating is carried out to the above bonding strength test of distortion 90 degree, and equal end finds that there is the chromium layer and comes off from the valve rod matrix; By hard detection, chromium layer hardness 1195HV, apparently higher than existing chromium plating valve rod chromium layer hardness.
Embodiment 3
The present embodiment is a kind of chrome-plated process for valve rod, comprises the following steps:
(i) sandblasting: the valve rod shaped is carried out to sandblasting with sandblast machine, wash in the clear water of 60-70 ℃ after processing;
(ii) etching: groove temperature: 57 ℃, current density: 39A/dm
2, the time: 48s; Contain following component in every liter of etching tank liquor: chromic anhydride CrO
3: 165g, sulphur is joined H
2SO
4: 1.3g, trivalent chromium: 0.8g, Strontium Sulphate SrSO
4: 35g, potassium silicofluoride: 15g;
(iii) chromium plating: groove temperature: 50 ℃, current density: 30A/dm
2, the time: 3.5h; Contain following component in every liter of chromium plating tank liquor: chromic anhydride CrO
3: 175g, sulphur is joined H
2SO
4: 1.8g, trivalent chromium: 0.8g, Strontium Sulphate SrSO
4: 35g, potassium silicofluoride: 25g, lithium fluoride or Sodium Fluoride: 2g, compound rare-earth: 0.3g; Described compound rare-earth comprises following component: La:39%, Ce:10%, Y:4%, Sc:20%, Gd:7%, Sm:4%, Dy:7%, Pr:9% by weight percentage;
(iv) clean: the clear water of the valve rod after chromium plating being put into to 85 ℃ washs.
Valve rod after the present embodiment chromium plating is carried out to the above bonding strength test of distortion 90 degree, and equal end finds that there is the chromium layer and comes off from the valve rod matrix; By hard detection, chromium layer hardness 1180HV, apparently higher than existing chromium plating valve rod chromium layer hardness.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (5)
1. the chrome-plated process for valve rod is characterized in that: comprise the following steps:
(i) sandblasting: the valve rod shaped is carried out to sandblasting with sandblast machine, wash in the clear water of 60-70 ℃ after processing;
(ii) etching: groove temperature: 55-57 ℃, current density: 37-39A/dm
2, the time: 43-48s; Contain following component in every liter of etching tank liquor: chromic anhydride: 150-165g, sulphur is joined: 1.1-1.3g, trivalent chromium: 0.5-0.8g, Strontium Sulphate: 20-35g, potassium silicofluoride: 10-15g;
(iii) chromium plating: groove temperature: 45-50 ℃, current density: 28-30A/dm
2, the time: 2.5-3.5h; Contain following component in every liter of chromium plating tank liquor: chromic anhydride: 165-175g, sulphur is joined: 1.5-1.8g, trivalent chromium: 0.5-0.8g, Strontium Sulphate: 25-35g, potassium silicofluoride: 20-25g has, lithium fluoride or Sodium Fluoride: 1-2g, compound rare-earth: 0.1～0.3g;
(iv) clean: the clear water of the valve rod after chromium plating being put into to 75-85 ℃ washs.
2. the chrome-plated process for valve rod as claimed in claim 1, it is characterized in that: described compound rare-earth comprises following component: La:38～40% by weight percentage, Ce:10～13%, Y:3～4%, Sc:15～20%, Gd:6～8%, Sm:3～4%, Dy:6～8%, Pr:7～9%, above each component sum is 100%.
3. the chrome-plated process for valve rod as claimed in claim 1 or 2 is characterized in that: comprise the following steps:
(i) sandblasting: the valve rod shaped is carried out to sandblasting with sandblast machine, wash in the clear water of 60 ℃ after processing;
(ii) etching: groove temperature: 55 ℃, current density: 37A/dm
2, the time: 43s; Contain following component in every liter of etching tank liquor: chromic anhydride: 150g, sulphur is joined: 1.1g, trivalent chromium: 0.5g, Strontium Sulphate: 20g, potassium silicofluoride: 10;
(iii) chromium plating: groove temperature: 45 ℃, current density: 28A/dm
2, the time: 2.5h; Contain following component in every liter of chromium plating tank liquor: chromic anhydride: 165g, sulphur is joined: 1.5g, trivalent chromium: 0.5g, Strontium Sulphate: 25g, potassium silicofluoride: 20g, lithium fluoride or Sodium Fluoride: 1-2g, compound rare-earth: 0.1～0.3g; Described compound rare-earth comprises following component: La:38%, Ce:13%, Y:4%, Sc:18%, Gd:8%, Sm:4%, Dy:6%, Pr:9% by weight percentage;
(iv) clean: the clear water of the valve rod after chromium plating being put into to 75 ℃ washs.
4. the chrome-plated process for valve rod as claimed in claim 1 or 2 is characterized in that: comprise the following steps:
(i) sandblasting: the valve rod shaped is carried out to sandblasting with sandblast machine, wash in the clear water of 65 ℃ after processing;
(ii) etching: groove temperature: 56 ℃, current density: 38A/dm
2, the time: 45s; Contain following component in every liter of etching tank liquor: chromic anhydride: 160g, sulphur is joined: 1.2g, trivalent chromium: 0.7g, Strontium Sulphate: 30g, potassium silicofluoride: 13g;
(iii) chromium plating: groove temperature: 48 ℃, current density: 29A/dm
2, the time: 3h; Contain following component in every liter of chromium plating tank liquor: chromic anhydride: 170g, sulphur is joined: 1.7g, trivalent chromium: 0.6g, Strontium Sulphate: 30g, potassium silicofluoride: 23g, lithium fluoride or Sodium Fluoride: 1.5g, compound rare-earth: 0.2g; Described compound rare-earth comprises following component: La:40%, Ce:12%, Y:3%, Sc:20%, Gd:6%, Sm:3%, Dy:8%, Pr:8% by weight percentage;
(iv) clean: the clear water of the valve rod after chromium plating being put into to 80 ℃ washs.
5. the chrome-plated process for valve rod as claimed in claim 1 or 2 is characterized in that: comprise the following steps:
(i) sandblasting: the valve rod shaped is carried out to sandblasting with sandblast machine, wash in the clear water of 60-70 ℃ after processing;
(ii) etching: groove temperature: 57 ℃, current density: 39A/dm
2, the time: 48s; Contain following component in every liter of etching tank liquor: chromic anhydride: 165g, sulphur is joined: 1.3g, trivalent chromium: 0.8g, Strontium Sulphate: 35g, potassium silicofluoride: 15g;
(iii) chromium plating: groove temperature: 50 ℃, current density: 30A/dm
2, the time: 3.5h; Contain following component in every liter of chromium plating tank liquor: chromic anhydride: 175g, sulphur is joined: 1.8g, trivalent chromium: 0.8g, Strontium Sulphate: 35g, potassium silicofluoride: 25g, lithium fluoride or Sodium Fluoride: 2g, compound rare-earth: 0.3g; Described compound rare-earth comprises following component: La:39%, Ce:10%, Y:4%, Sc:20%, Gd:7%, Sm:4%, Dy:7%, Pr:9% by weight percentage;
(iv) clean: the clear water of the valve rod after chromium plating being put into to 85 ℃ washs.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210462579.4A CN102965695B (en) | 2012-11-16 | 2012-11-16 | Chromium plating process used for valve rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210462579.4A CN102965695B (en) | 2012-11-16 | 2012-11-16 | Chromium plating process used for valve rod |
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| CN102965695A true CN102965695A (en) | 2013-03-13 |
| CN102965695B CN102965695B (en) | 2015-02-04 |
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| CN201210462579.4A Expired - Fee Related CN102965695B (en) | 2012-11-16 | 2012-11-16 | Chromium plating process used for valve rod |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614632A (en) * | 2013-12-10 | 2014-03-05 | 镇江市华阳机电制造有限公司 | Manufacturing method of submarine oil well valve base |
| CN105127203A (en) * | 2015-10-10 | 2015-12-09 | 上海通乐冶金设备工程有限公司 | Shot blasting texturing chromeplate work roll for cold rolling temper mill and production process of work roll |
| CN107313079A (en) * | 2017-07-31 | 2017-11-03 | 安徽沃德气门制造有限公司 | A kind of automobile air valve rapid chrome plating technique |
| CN107354494A (en) * | 2017-07-31 | 2017-11-17 | 安徽沃德气门制造有限公司 | A kind of processing method for extending valve service life |
| CN111979565A (en) * | 2019-05-22 | 2020-11-24 | 天津大学 | Method for electroplating microporous nanocrystalline hard chromium layer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614632A (en) * | 2013-12-10 | 2014-03-05 | 镇江市华阳机电制造有限公司 | Manufacturing method of submarine oil well valve base |
| CN103614632B (en) * | 2013-12-10 | 2015-10-28 | 镇江市华阳机电制造有限公司 | A kind of manufacture method of sub-sea drilled wells valve base |
| CN105127203A (en) * | 2015-10-10 | 2015-12-09 | 上海通乐冶金设备工程有限公司 | Shot blasting texturing chromeplate work roll for cold rolling temper mill and production process of work roll |
| CN107313079A (en) * | 2017-07-31 | 2017-11-03 | 安徽沃德气门制造有限公司 | A kind of automobile air valve rapid chrome plating technique |
| CN107354494A (en) * | 2017-07-31 | 2017-11-17 | 安徽沃德气门制造有限公司 | A kind of processing method for extending valve service life |
| CN111979565A (en) * | 2019-05-22 | 2020-11-24 | 天津大学 | Method for electroplating microporous nanocrystalline hard chromium layer |
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|---|---|
| CN102965695B (en) | 2015-02-04 |
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