CN1220796C - Process for plating Cr on iner cavity of cylinder sleeve - Google Patents
Process for plating Cr on iner cavity of cylinder sleeve Download PDFInfo
- Publication number
- CN1220796C CN1220796C CN 01133510 CN01133510A CN1220796C CN 1220796 C CN1220796 C CN 1220796C CN 01133510 CN01133510 CN 01133510 CN 01133510 A CN01133510 A CN 01133510A CN 1220796 C CN1220796 C CN 1220796C
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- cylinder sleeve
- positive electrode
- plating
- current density
- lead alloy
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- Electroplating Methods And Accessories (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
The present invention discloses a process for plating Cr to an inner cavity of a cylinder sleeve. The processing steps of the present invention comprises: 1, placing the cylinder sleeve into plating liquid; 2, inserting a prepared lead alloy positive electrode into a cavity of the cylinder sleeve; 3, connecting the lead alloy positive electrode and an anode and using the cylinder sleeve as a negative electrode to be connected with a cathode; 4, switching on a power supply: the lead weight content of the lead alloy positive electrode is 30 to 40%, and the surface of the lead alloy positive electrode is engraved into a groove. The plating liquid is maintained to be at the temperature of 59 to 63 DEG C. The plating liquid comprises by weight 250 to 260g/ liter of CrO3, and 2.1-2.5 g/liter of H2SO4. Reverse current is used after the power supply is switched on, time is 10 to 12 seconds, and current density is 40 A/dcm<2>, then, the reverse current is changed into forward current, the current density is 80 to 90 A/dcm<2>, and switching-on time is 5 to 6 minutes; subsequently, the forward current is reduced to normal current of 55 to 60 A/dcm<2>.
Description
(1) technical field:
The present invention relates to a kind of process of surface treatment, relate in particular to a kind of automobile, chromed hardened technology of tractor engine cylinder sleeve surface of internal cavity of being used for.
(2) background technology:
At present, along with industrial expansion, the chromium coating of electroplating wear resistance in the machinofacture is widely used.Wear resistance chromium plating claims hard chrome again, it is a kind of functional plating, mainly be to utilize the characteristic of chromium to improve the hardness of mechanical component, wear-resisting, heatproof and chemical property such as anti-corrosion, its advantage is: after plating certain thickness one deck hard chrome, the life-span 3-5 that can prolong plating piece doubly, treated more still electrodepositable restores after wearing and tearing.Therefore, in automotive industry, the chrome plated piston ring that the piston ring in the engine cylinder promptly adopts has increased its work-ing life greatly.But, the chromium plating technology does not also obtain general application at cylinder inner cavity, because cylinder sleeve is as material with the pig iron, though its surface of internal cavity has certain intensity, but since the cylinder inner cavity surface do not stop with piston ring mutual friction mutually, cause surperficial abrasion easily, in case wearing and tearing, then entire cylinder is just scrapped, and needs the cylinder that more renews again.The inventor finds through conscientious analysis and research, in chrome-plated process as the anode alloy surface area ratio as the ratio of the plating piece surface-area of negative electrode greater than 1: 1, thereby, this has just limited the chromed realization of cylinder sleeve inwall, because as the anodic alloy is to be positioned at the cylinder sleeve chamber, so no matter it is rounded or all can't increasing to of side makes surface area ratio greater than 1: 1.Can hold in the size of the preparation of plating bath and electric current in addition also be the gordian technique that reach the chromium plating effect.
(3) summary of the invention:
The present invention solves in cylinder sleeve chamber chromium plating to be difficult for the problem of carrying out; Technical scheme of the present invention is: a kind of process for plating Cr on iner cavity of cylinder sleeve, its processing step is: one, cylinder sleeve is inserted in the plating bath, two, the lead alloy positive electrode that makes is inserted in the cylinder sleeve chamber, three, positive electrode is connected with anode, cylinder sleeve is connected with negative electrode as negative electrode, four, connect power supply, wherein, the plumbous weight content of lead alloy positive electrode is 30-40%, in order to increase the surface-area of lead alloy positive electrode, the present invention has adopted lead alloy positive electrode surface has been carved into groove; Bath temperature maintains 59-63 ℃, and each composition weight content of plating bath is: chromic anhydride 250-260g/ liter, sulfuric acid 2.1-2.5g/ liter; Begin to use reversible circulation after connecting power supply, the time is 10-12 second, and current density is 40A/cm
2, change forward current then, current density is 80-90A/cm
2, be 5-6 minute conduction time, dropping to normal current density then is 55-60A/cm
2Positively effect of the present invention is that process for plating Cr on iner cavity of cylinder sleeve is quick, simple, cost is low, and the cylinder sleeve life-span is prolonged, and reduces or reduce the maintenance cost of car load.
After coating reaches requirement, made the anode porosity 5 minutes with reversible circulation, current density is 40A/cm
2, make the cylinder sleeve internal chamber wall have micropore so that the impregnation oils lubricate.
The positive electrode preparation method is molten into one and gets final product for the lead of 30-40 part is put with the alloy (trade(brand)name) of 60-70 part.
(5) embodiment:
Embodiment one: cylinder sleeve is inserted in the bath trough, with the plumbous weight content that makes is that 30% alloy positive electrode is inserted in the cylinder sleeve chamber, lead alloy positive electrode surface is carved into groove, positive electrode is connected with anode, cylinder sleeve is connected with negative electrode as negative electrode, connect power supply, bath temperature maintains 59 ℃, and each composition weight content of plating bath is: chromic anhydride (CrO
3) 250g/ liter, sulfuric acid (H
2SO
4) the 2.1g/ liter; Begin to use reversible circulation after connecting power supply, the time is 10 seconds, and current density is 40A/cm
2, change forward current then, current density is 80A/cm
2, be 5 minutes conduction time, dropping to normal current density then is 55A/cm
2, after coating reaches requirement, made the anode porosity 5 minutes with reversible circulation, current density is 40A/cm
2, make the cylinder sleeve internal chamber wall have micropore so that the impregnation oils lubricate.
Embodiment two, cylinder sleeve is inserted in the groove of plating bath, with the plumbous weight content that makes is that 35% lead alloy positive electrode is inserted in the cylinder sleeve chamber, lead alloy positive electrode surface is carved into groove, positive electrode is connected with anode, cylinder sleeve is connected with negative electrode as negative electrode, connect power supply, bath temperature maintains 60 ℃, and each composition weight content of plating bath is: chromic anhydride (CrO
3) 255g/ liter, sulfuric acid (H
2SO
4) the 2.3g/ liter; Begin to use reversible circulation after connecting power supply, the time is 11 seconds, and current density is 40A/cm
2, change forward current then, current density is 85A/cm
2, be 5.5 minutes conduction time, so dropping to normal current density is 55A/cm
2, after coating reaches requirement, made the anode porosity 5 minutes with reversible circulation, current density is 40A/cm
2, make the cylinder sleeve internal chamber wall have micropore so that the impregnation oils lubricate.
Embodiment three, cylinder sleeve is inserted in the bath trough, with the plumbous weight content that makes is that 40% lead alloy positive electrode is inserted in the cylinder sleeve chamber, lead alloy positive electrode surface is carved into groove, positive electrode is connected with anode, cylinder sleeve is connected with negative electrode as negative electrode, connect power supply, bath temperature maintains 61 ℃, and each composition weight content of plating bath is: chromic anhydride (CrO
3) 260g/ liter, sulfuric acid (H
2SO
4) the 2.5g/ liter; Begin to use reversible circulation after connecting power supply, the time is 12 seconds, and current density is 40A/cm
2, change forward current then, current density is 90A/cm
2, be 5 minutes conduction time, dropping to normal current density then is 55A/cm
2, after coating reaches requirement, made the anode porosity 5 minutes with reversible circulation, current density is 40A/cm
2, make the cylinder sleeve internal chamber wall have micropore so that impregnation oils plays lubrication.
This chrome-plated process not only can be used on the chromium plating in the cylinder sleeve chamber, also can play a role in military enterprise, can increase its smooth finish and hardness after plating hard chrome in various rifles, the bore, increases its work-ing life.
Claims (3)
1, a kind of process for plating Cr on iner cavity of cylinder sleeve, its processing step is: one, cylinder sleeve is inserted in the plating bath, two, the lead alloy positive electrode that makes is inserted in the cylinder sleeve chamber, three, positive electrode is connected with anode, cylinder sleeve is connected with negative electrode as negative electrode, four, connect power supply, it is characterized in that the plumbous weight content of lead alloy positive electrode is 30-40%, lead alloy positive electrode surface is carved into groove; Bath temperature maintains 59-63 ℃, and each composition weight content of plating bath is: chromic anhydride 250-260g/ liter, sulfuric acid 2.1-2.5g/ liter; Begin to use reversible circulation after connecting power supply, the time is 10-12 second, and current density is 40A/cm
2, change forward current then, current density is 80-90A/cm
2, be 5-6 minute conduction time, dropping to normal current density then is 55-60A/cm
2
2, process for plating Cr on iner cavity of cylinder sleeve according to claim 1 is characterized in that lead alloy positive electrode preparation method is molten into one and gets final product for the lead of 30-40 part is put with the alloy of 60-70 part.
3, process for plating Cr on iner cavity of cylinder sleeve according to claim 1 and 2 is characterized in that after coating reaches requirement, makes the anode porosity 5 minutes with reversible circulation, and current density is 40A/cm
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133510 CN1220796C (en) | 2001-09-27 | 2001-09-27 | Process for plating Cr on iner cavity of cylinder sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133510 CN1220796C (en) | 2001-09-27 | 2001-09-27 | Process for plating Cr on iner cavity of cylinder sleeve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1356407A CN1356407A (en) | 2002-07-03 |
| CN1220796C true CN1220796C (en) | 2005-09-28 |
Family
ID=4671874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01133510 Expired - Fee Related CN1220796C (en) | 2001-09-27 | 2001-09-27 | Process for plating Cr on iner cavity of cylinder sleeve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1220796C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046096A (en) * | 2012-12-17 | 2013-04-17 | 四川凌峰航空液压机械有限公司 | Thickened hard chromium plating technique for deep holes |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449134C (en) * | 2003-11-17 | 2009-01-07 | 烟台万斯特有限公司 | Chromium plating rack for cylinder liner bore |
| CN101812708B (en) * | 2010-04-20 | 2011-08-24 | 安徽华东光电技术研究所 | Method for plating chromium on molybdenum core rod |
| CN108823612A (en) * | 2018-06-29 | 2018-11-16 | 长沙大力神液压工程有限公司 | A kind of inner hole of workpiece hard chrome electroplating solution and its electroplating technology |
-
2001
- 2001-09-27 CN CN 01133510 patent/CN1220796C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046096A (en) * | 2012-12-17 | 2013-04-17 | 四川凌峰航空液压机械有限公司 | Thickened hard chromium plating technique for deep holes |
| CN103046096B (en) * | 2012-12-17 | 2016-03-30 | 四川凌峰航空液压机械有限公司 | Deep hole thickeies chromed hardened processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1356407A (en) | 2002-07-03 |
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