CN101418458A - Double layer chromium electroplating processing process for conveying cylinder - Google Patents
Double layer chromium electroplating processing process for conveying cylinder Download PDFInfo
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- CN101418458A CN101418458A CNA200810143572XA CN200810143572A CN101418458A CN 101418458 A CN101418458 A CN 101418458A CN A200810143572X A CNA200810143572X A CN A200810143572XA CN 200810143572 A CN200810143572 A CN 200810143572A CN 101418458 A CN101418458 A CN 101418458A
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- chromium
- electroplate liquid
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- plating tank
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Abstract
The invention provides a bilayer-chromium electroplating machining process for transport cylinders. The process comprises the following steps of making a CrO3 solution and an H2SO2 solution into an electroplating solution according to a certain proportion, putting the electroplating solution into an electroplating bath, heating to a certain fixed value, placing and preheating a transport cylinder in the electroplating bath, removing impurities, plating the transport cylinder with 20 to 30 microns of milky white chromium at 15 to 25 A of current per dm<2>, cooling the transport cylinder to a certain temperature, adopting a stepped current raising method to raise the current to 35 to 45 A per dm<2> and plating the transport cylinder with 280 to 300 microns of hard chromium, so as to obtain the transport cylinder plated with bilayer-chromium. The transport cylinder manufactured through the process can effectively prevent chromium layers from falling off caused by corrosion or prevent burst caused by insufficient bonding strength, thereby greatly increasing the life span of the transport cylinder.
Description
Affiliated technical field
The present invention relates to a kind of complete processing of carrying cylinder, particularly a kind of concrete of heavy engineering machinery concrete pumping system is carried the cylinder complete processing.
Background technology
The many wear-resisting chromium layers that directly plate one deck high rigidity in cylinder surface of traditional conveying cylinder, chrome-plated process is simple, initial working temperature is low, process control is convenient, but because the hardness height of chromium layer, internal stress is big, ductility is very little, lower with hardness, ductility basic material preferably forms bigger contrast, and in use, because the release of coating internal stress, the original tiny crack of local coating is enlarged deepen sensible matrix, cause concrete slurry to infiltrate into cylinder body, form corrosion cell with coating, and along with the increase of hot spot, the bonding force variation of coating and cylinder body metal, even cause local chromium layer to peel off, shortened the work-ing life of carrying cylinder.
Summary of the invention
The objective of the invention is to: a kind of double layer chromium electroplating processing process for conveying cylinder is provided, accomplish effectively to prevent that concrete slurry from permeating to cylinder body, can reduce hardness gradient again, improve corrosion resistance nature and coating and the cylinder body bonding force of coating, thereby improve conveying cylinder work-ing life.
The present invention achieves the above object by the following technical programs
Technical scheme of the present invention is by following technological step operation:
A. prepare electroplate liquid, promptly adopt the CrO of 220～250 grams per liters
3The H of solution and 2.5～3.1 grams per liters
2SO
4Solution, CrO
3With H
2SO
4Concentration mix the formation electroplate liquid in the ratio of 100:1.15～1.25;
B. the electroplate liquid for preparing is poured in the plating tank;
C. the temperature of electroplating solution in the plating tank is increased to 70 ± 2 ℃;
The electroplate liquid that the conveying cylinder that d. will totally clean is put into plating tank is preheated to the temperature of electroplate liquid;
E. anti-carve and remove erosion, promptly plating tank is passed through 15～25A/dm
2The foreign material of carrying cylinder surfaces are further removed in oppositely power supply;
F. plating tank is passed through 15～25A/dm
2Forward energising 120～150 minutes, the milky white chromium of plating 20～30 micron thickness;
G. under the situation that does not change the supply current size, the cooling system by coating bath reduces bath temperature to 55 ± 2 ℃;
H. adopt ladder to rise the method for electricity again, be about to electric current and rise to 35～40A/dm
2, switched on 420～450 minutes, plate 280～300 microns hard chrome;
I. will plate good conveying cylinder and from plating tank, take out clean getting final product.
Know-why of the present invention is: under the constant condition of current density, reduce the hardness that bath temperature can improve coating; Improve current density and also can improve coating hardness under temperature-resistant condition, therefore, when hard chrome plating, bath temperature has been reduced to 55 ± 2 ℃ by 70 ± 2 ℃, current density is by 15～25A/dm
2Bring up to 35～40A/dm
2, like this, carry on the milky white chromium layer of cylinder and be coated with one deck hard chrome again, formed the excessive layer of milder hardness, make corrosion-resistant and bonding force aspect that by a relatively large margin raising all be arranged.
The present invention compares background technology and has following characteristics:
Because milky white chromium coating crystallization is careful, thickness reaches 20～30 microns, thereby coating imporosity almost, can effectively stop concrete slurry to matrix permeability, prolonged because of coating hole and tiny crack penetrate the time that forms corrosion cell, because hard chromium is arranged, formed the excessively mild of hardness simultaneously, avoided causing the chromium layer to peel off and scarce, effectively improved the work-ing life of carrying cylinder because of collapsing of causing of bonding strength deficiency because of corrosion.
Description of drawings
Accompanying drawing is a process flow diagram of the present invention.
Embodiment
Now the invention will be further described in conjunction with the accompanying drawings and embodiments.
Embodiment one:
As shown in drawings, production technique of the present invention is undertaken by following step.
A. prepare electroplate liquid, adopt the CrO of 220～250 grams per liters
3The H of solution and 2.5～3.1 grams per liters
2SO
4Solution is pressed CrO
3With H
2SO
4Weight ratio is that 100:1.15 mixes formation electroplate liquid 1;
B. the electroplate liquid 1 for preparing is poured in the plating tank;
C. the temperature of the electric degree liquid 1 in the plating tank is brought up to 68 ℃, form and electroplate preceding plating bath 2;
The electroplate liquid that the conveying cylinder that d. will totally clean is put into plating tank is preheated to the temperature of electroplate liquid, forms conveying cylinder 3 to be plated;
E. plating tank is passed through 15A/dm
2Reverse power supply, anti-carve and remove erosion, further remove the foreign material of carrying cylinder surfaces, form clean conveying cylinder 4 to be plated;
F. plating tank is pressed 15A/dm
2Forward energising 150 minutes carrying cylinder surfaces to plate the milky white chromium of one deck, forms milky white chromium layer and carries cylinder 5;
G. under the situation that does not change the supply current size, reduce bath temperature to 53 ℃ by the plating tank cooling system;
H. adopt ladder to rise the method for electricity, electric current is risen to 35A/dm
2, switched on 420 minutes, plate one deck hard chrome, form hard chrome coating and carry cylinder 6;
I. will plate good conveying cylinder and from plating tank, take out clean milky white chromium, the double-deck chromium conveying of the hard chrome cylinder 7 of forming.
Embodiment two:
Present embodiment and embodiment one are basic identical, and different is CrO among the technological step a
3With H
2SO
4Weight ratio be 100:1.25, the temperature of electroplate liquid is increased to 72 ℃ among the technological step c, among the technological step e oppositely supply current be 25A/dm
2, the forward electrical current among the technological step f is 25A/dm
2, bath temperature is reduced to 57 ℃ among the technological step g, among the h electric current is risen to 45A/dm in the technological step
2
Embodiment three:
Present embodiment and embodiment one are basic identical, and different is, and that to adopt among the technological step a is CrO
3With H
2SO
4Weight ratio is 100:1.2, and the temperature of electroplate liquid is increased to 70 ℃ among the technological step c, and reverse supply current is 20A/dm among the technological step e
2, the forward electrical current among the technological step f is 20A/dm
2, the bath temperature in the technological step among the g is reduced to 55 ℃, among the technological step h electric current is risen to 40A/dm
2
Above-mentioned three embodiment can draw as drawing a conclusion: the electroplate liquid that adopts different components, temperature, electric current carry out the plating of milky white chromium and hard chrome to carrying cylinder, can both make and carry cylinder to plate double-deck chromium, and wherein nexine is milky white chromium, skin is a hard chrome, and wherein embodiment three is a most preferred embodiment; When promptly preparing electroplate liquid, CrO
3With H
2SO
4Optimum weight ratio be 100:1.2, the temperature of plating the electroplate liquid of milky white chromium layer is 70 ℃, oppositely and forward current be 20A/dm
2, the temperature of electroplating solution during the hard chrome plating layer is 55 ℃, electric current is 40A/dm
2
Claims (2)
1. double layer chromium electroplating processing process for conveying cylinder is characterized in that following technological step:
A. adopt the CrO of 220～250 grams per liters
3The H of solution and 2.5～3.1 grams per liters
2SO
4Solution, CrO
3With H
2SO
4Weight ratio mix in the ratio of 100:1.15～1.25 and form electroplate liquid (1);
B. the electroplate liquid for preparing is poured in the plating tank;
C. the temperature with the electroplate liquid in the plating tank rises to 70 ± 2 ℃, forms the preceding electroplate liquid (2) of plating;
D. the electroplate liquid of the conveying cylinder of cleaning being put into plating tank is preheated to the temperature of electroplate liquid, forms conveying cylinder to be plated (3);
E. plating tank is pressed 15～25A/dm
2The foreign material of carrying cylinder surfaces are further removed in oppositely power supply, form clean conveying cylinder to be plated (4);
F. plating tank is passed to 15～25A/dm
2Forward current 120～150 minutes, the milky white chromium of plating 20～30 micron thickness forms milky white chromium layer and carries cylinder (5);
G. reduce bath temperature to 55 ± 2 ℃ by the plating tank cooling system;
H. rise the method for electricity again with ladder, electric current is risen to 35～45A/dm
2, switched on 420～450 minutes, plate 280～300 microns hard chrome, form hard chrome coating and carry cylinder (6);
I. will plate good conveying cylinder and from plating tank, take out clean milky white chromium layer and the double-deck chromium conveying of the hard chrome coating cylinder (7) of forming.
2. according to claim 1 described double layer chromium electroplating processing process for conveying cylinder, it is characterized in that preparing the CrO of electroplate liquid
3With H
2SO
4Optimum weight ratio is 100:1.2, and the optimum temps of plating milky white chromium layer electroplate liquid is 70 ℃, and forward and reverse optimum current is 20A/dm
2, the optimum temps of hard chrome plating layer electroplate liquid is 55 ℃, electric current is 40A/dm
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810143572XA CN101418458A (en) | 2008-11-12 | 2008-11-12 | Double layer chromium electroplating processing process for conveying cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810143572XA CN101418458A (en) | 2008-11-12 | 2008-11-12 | Double layer chromium electroplating processing process for conveying cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101418458A true CN101418458A (en) | 2009-04-29 |
Family
ID=40629453
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200810143572XA Pending CN101418458A (en) | 2008-11-12 | 2008-11-12 | Double layer chromium electroplating processing process for conveying cylinder |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330127A (en) * | 2011-10-10 | 2012-01-25 | 长沙中联重工科技发展股份有限公司 | Conveying tank and manufacturing method thereof, and pumping equipment with conveying tank |
| CN102337538A (en) * | 2010-07-20 | 2012-02-01 | 罗伯特·博世有限公司 | Wearing protection system provided with gradual hardness distribution |
| CN102717238A (en) * | 2012-06-29 | 2012-10-10 | 上海鸿得利重工股份有限公司 | Manufacture method of concrete conveying cylinder and product |
| CN103046085A (en) * | 2012-12-27 | 2013-04-17 | 南通市申海工业技术科技有限公司 | Chromium plating process of nuclear generator unit members |
| CN103046094A (en) * | 2011-10-12 | 2013-04-17 | 韶关市华骏机械有限公司 | Composite chromium electroplating method on metal surface |
| WO2013053097A1 (en) * | 2011-10-10 | 2013-04-18 | 长沙中联重工科技发展股份有限公司 | Conveying cylinder, method for manufacture thereof, and pumping equipment with same |
| CN104532237A (en) * | 2014-12-22 | 2015-04-22 | 中国石油天然气股份有限公司 | Processing technology of pump cylinder and plunger of oil well pump |
| CN104790006A (en) * | 2015-04-22 | 2015-07-22 | 江汉石油钻头股份有限公司 | Strengthened composite layer on rotor surface of screw drilling tool and machining process thereof |
| CN109097805A (en) * | 2018-08-02 | 2018-12-28 | 哈尔滨飞机工业集团有限责任公司 | A kind of chrome-plated process method |
| CN109183084A (en) * | 2018-11-20 | 2019-01-11 | 重庆建设工业(集团)有限责任公司 | A kind of method of pipe fitting inner hole composite chrome plating and chrome-plating device for this method |
| CN111041540A (en) * | 2019-12-24 | 2020-04-21 | 托伦斯半导体设备启东有限公司 | Wear-resistant treatment process for semiconductor silicon wafer |
-
2008
- 2008-11-12 CN CNA200810143572XA patent/CN101418458A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337538A (en) * | 2010-07-20 | 2012-02-01 | 罗伯特·博世有限公司 | Wearing protection system provided with gradual hardness distribution |
| WO2013053097A1 (en) * | 2011-10-10 | 2013-04-18 | 长沙中联重工科技发展股份有限公司 | Conveying cylinder, method for manufacture thereof, and pumping equipment with same |
| CN102330127B (en) * | 2011-10-10 | 2012-12-05 | 中联重科股份有限公司 | Conveying cylinder, preparation method thereof and pumping equipment comprising conveying cylinder |
| CN102330127A (en) * | 2011-10-10 | 2012-01-25 | 长沙中联重工科技发展股份有限公司 | Conveying tank and manufacturing method thereof, and pumping equipment with conveying tank |
| CN103046094A (en) * | 2011-10-12 | 2013-04-17 | 韶关市华骏机械有限公司 | Composite chromium electroplating method on metal surface |
| CN103046094B (en) * | 2011-10-12 | 2016-02-03 | 韶关市华骏机械有限公司 | A kind of metallic surface composite chrome plating method |
| CN102717238A (en) * | 2012-06-29 | 2012-10-10 | 上海鸿得利重工股份有限公司 | Manufacture method of concrete conveying cylinder and product |
| CN103046085A (en) * | 2012-12-27 | 2013-04-17 | 南通市申海工业技术科技有限公司 | Chromium plating process of nuclear generator unit members |
| CN103046085B (en) * | 2012-12-27 | 2016-05-18 | 南通市申海工业技术科技有限公司 | Nuclear power generating sets member chrome-plated process |
| CN104532237A (en) * | 2014-12-22 | 2015-04-22 | 中国石油天然气股份有限公司 | Processing technology of pump cylinder and plunger of oil well pump |
| CN104790006A (en) * | 2015-04-22 | 2015-07-22 | 江汉石油钻头股份有限公司 | Strengthened composite layer on rotor surface of screw drilling tool and machining process thereof |
| CN109097805A (en) * | 2018-08-02 | 2018-12-28 | 哈尔滨飞机工业集团有限责任公司 | A kind of chrome-plated process method |
| CN109183084A (en) * | 2018-11-20 | 2019-01-11 | 重庆建设工业(集团)有限责任公司 | A kind of method of pipe fitting inner hole composite chrome plating and chrome-plating device for this method |
| CN111041540A (en) * | 2019-12-24 | 2020-04-21 | 托伦斯半导体设备启东有限公司 | Wear-resistant treatment process for semiconductor silicon wafer |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Open date: 20090429 |