CN101812709A - Anti-hydrogen embrittlement electroplating process of piston rod of vehicle shock absorber - Google Patents
Anti-hydrogen embrittlement electroplating process of piston rod of vehicle shock absorber Download PDFInfo
- Publication number
- CN101812709A CN101812709A CN 201010173991 CN201010173991A CN101812709A CN 101812709 A CN101812709 A CN 101812709A CN 201010173991 CN201010173991 CN 201010173991 CN 201010173991 A CN201010173991 A CN 201010173991A CN 101812709 A CN101812709 A CN 101812709A
- Authority
- CN
- China
- Prior art keywords
- piston rod
- hydrogen embrittlement
- electroplating
- electrolytic degreasing
- workpiece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 36
- 239000001257 hydrogen Substances 0.000 title claims abstract description 36
- 238000009713 electroplating Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 10
- 230000035939 shock Effects 0.000 title claims abstract description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000007747 plating Methods 0.000 claims abstract description 19
- 238000005238 degreasing Methods 0.000 claims abstract description 16
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 10
- 239000011651 chromium Substances 0.000 claims abstract description 10
- 238000005530 etching Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 claims description 5
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 25
- 125000004435 hydrogen atom Chemical group [H]* 0.000 abstract description 14
- 238000004140 cleaning Methods 0.000 abstract 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 8
- 239000013078 crystal Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 4
- 239000012530 fluid Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- -1 hydrogen ions Chemical class 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Fluid-Damping Devices (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses an anti-hydrogen embrittlement electroplating process of a piston rod of a vehicle shock absorber, comprising the following steps of: (1) shifting up of an automatic chromium-plated wire piston rod; (2) electrolytic degreasing before electroplating: putting the piston rod in a lye tank to carry out electrolytic degreasing; (3) anode etching: electrifying and etching by taking the piston rod as an anode, wherein microscopic local high spots on the surface of the piston rod can be corroded, and the surface finish quality of a workpiece can be improved; (4) microcrack hard chromium electroplating: putting the piston rod in a plating liquid bath for microcrack hard chromium electroplating; (5) cleaning: cleaning the workpiece and recovering electroplating liquid; and (6) shifting down of the automatic chromium-plated wire piston rod. The anti-hydrogen embrittlement electroplating process is characterized in that: in the step 2, electrolytic degreasing is carried out in the lye tank by taking the piston rod as the anode; and in the step 4, the plating liquid flows in a plating tank from bottom up until the plating liquid overflows the plating tank. The invention can avoid the sufficient contact of the piston and hydrogen atoms, avoid the generation of hydrogen embrittlement, and improve the safety of the piston rod.
Description
Technical field
The present invention relates to a kind of anti-hydrogen embrittlement electroplating process that is used for automobile vibration damper piston rod.
Background technology
The piston rod of shock absorber for vehicle in order to improve its corrosion and wear resistance wearability, need carry out chrome-plated process; The electroplating technology that extensively adopts may further comprise the steps: 1) hang on the chromium plating line piston rod automatically at present; 2) electroplate preceding electrolytic degreasing: piston rod is placed the lye vat electrolytic degreasing as negative electrode; 3) anode etching: piston rod as the anodal closure etching, can be improved the surface smoothness of workpiece with the corrosion of the local high spot on the piston rod surface microcosmic; 4) electroplate the tiny crack hard chrome: place the immobilized plating bath to electroplate the tiny crack hard chrome in piston rod; 5) clean: be used to reclaim electroplate liquid; 6) chromium plating line piston rod is hung down automatically; The shortcoming of this technology is: 1) when electrolytic degreasing, piston rod is as the hydrogen ion of the easy adsorption zone positive electricity of negative electrode, hydrogen ion combines with electronics and is reduced into hydrogen atom, hydrogen atom is located to gather at other rejected region of piston rod surface crackle, crystal grain hole or material etc., two hydrogen atoms are combined into a hydrogen molecule, form hydrogen, after reaching certain pressure, under external force, will produce hydrogen embrittlement; 2) in electroplating tiny crack hard chrome process, piston rod is because as negative electrode, its surface unavoidably can contact hydrogen atom, converts in the chemical energy process at electric energy, and chromium ion is deposited on piston rod surface usefulness and only has an appointment 27%.All the other about 73% all are used for liberation of hydrogen, and two hydrogen atoms can not in time be taken away in conjunction with the hydrogen that forms, and the time, long back was gathered toward the motion of rejected regions such as surface crack, lattice vacancy, formed hydrogen pressure, also easily produced hydrogen embrittlement; If automobile meets with Special Circumstances, shock absorber piston rod is subjected to the surging force perpendicular to piston rod surface, and piston rod will rupture as producing hydrogen embrittlement, cause car crash.
Summary of the invention
The objective of the invention is to the above-mentioned deficiency at prior art, a kind of anti-hydrogen embrittlement electroplating process of piston rod of vehicle shock absorber is provided, it can avoid fully contacting of piston rod and hydrogen atom, avoids producing hydrogen embrittlement, has improved the security of piston rod.
For achieving the above object, the anti-hydrogen embrittlement electroplating process of piston rod of vehicle shock absorber of the present invention may further comprise the steps: 1) hang on the chromium plating line piston rod automatically; 2) electroplate preceding electrolytic degreasing: piston rod is placed lye vat anode electrolytic degreasing; 3) anode etching: piston rod as the anodal closure etching, can be improved the surface smoothness of workpiece with the corrosion of the local high spot on the piston rod surface microcosmic; 4) electroplate the tiny crack hard chrome: place bath trough to electroplate the tiny crack hard chrome in piston rod; 5) clean: be used to clean workpiece and reclaim electroplate liquid; 6) chromium plating line piston rod is hung down automatically, it is characterized in that in step 2 piston rod is as anode electrolytic degreasing in lye vat; In step 4, plating bath flows in coating bath from the bottom up, until overflowing coating bath.
In the present invention, because piston rod is as anode electrolytic degreasing in lye vat, repel mutually with the hydrogen ion of positively charged, can avoid contacting a large amount of hydrogen ions, thereby avoid hydrogen atom to locate to gather and, prevent to produce hydrogen embrittlement in conjunction with forming hydrogen molecule at other rejected region of piston rod surface crackle, crystal grain hole or material etc.; Simultaneously, piston rod when electroplating is because as negative electrode, though its surface unavoidably can contact hydrogen atom, but because plating bath is flowed by static instead, flowing fluid plays souring from the bottom up, and two hydrogen atoms are in time taken away in conjunction with the hydrogen that forms, and is unlikely to be trapped in piston rod surface, avoid long back of time to gather, also can avoid producing hydrogen embrittlement in this operation toward other rejected region motion of piston rod surface crackle, crystal grain hole or material;
As a further improvement on the present invention, hang in back 16 hours under piston rod, workpiece is placed in the process furnace of 195 ℃ ~ 215 ℃ of temperature, soaking time was greater than 1.5 hours; Can make the hydrogen of other rejected region of entering piston rod surface crackle, crystal grain hole or material on a small quantity before stable, overflow, further prevent to produce hydrogen embrittlement;
In sum, the present invention can avoid fully contacting of piston rod and hydrogen atom, avoids producing hydrogen embrittlement, has improved the security of piston rod.
Embodiment
The anti-hydrogen embrittlement electroplating process of piston rod of vehicle shock absorber of the present invention may further comprise the steps: 1) hang on the chromium plating line piston rod automatically; 2) electroplate before electrolytic degreasing: with piston rod as anode electrolytic degreasing in lye vat; 3) anode etching: piston rod as the anodal closure etching, can be improved the surface smoothness of workpiece with the corrosion of the local high spot on the piston rod surface microcosmic, can improve electroplating quality; 4) electroplate the tiny crack hard chrome: place the bath trough that flows to electroplate the tiny crack hard chrome in piston rod, make that plating bath flows from the bottom up this moment in coating bath, until overflowing coating bath; 5) clean: be used to clean workpiece and reclaim electroplate liquid; 6) chromium plating line piston rod is hung down automatically; 7) dehydrogenation: hang in back 16 hours under piston rod, workpiece is placed in the process furnace of 195 ℃ ~ 215 ℃ of temperature, soaking time was greater than 1.5 hours; Can make the hydrogen of other rejected region of entering piston rod surface crackle, crystal grain hole or material on a small quantity before stable, overflow, further prevent to produce hydrogen embrittlement;
In the present invention, because piston rod is as anode electrolytic degreasing in lye vat, repel mutually with the hydrogen ion of positively charged, can avoid contacting a large amount of hydrogen ions, thereby avoid hydrogen atom to locate to gather and, prevent to produce hydrogen embrittlement in conjunction with forming hydrogen molecule at other rejected region of piston rod surface crackle, crystal grain hole or material etc.; Simultaneously, piston rod when electroplating is because as negative electrode, though its surface unavoidably can contact hydrogen atom, but because plating bath is flowed by static instead, flowing fluid plays souring from the bottom up, and two hydrogen atoms are in time taken away in conjunction with the hydrogen that forms, and is unlikely to be trapped in piston rod surface, avoid long back of time to gather, also can avoid producing hydrogen embrittlement in this operation toward other rejected region motion of piston rod surface crackle, crystal grain hole or material; Overflowed before stable by the hydrogen that increases the dehydrogenation operation, can make other rejected region that enters piston rod surface crackle, crystal grain hole or material on a small quantity, further prevent to produce hydrogen embrittlement; Compare with former technology, the present invention all can significantly reduce the probability that hydrogen embrittlement takes place on three links, can both pass through hydrogen embrittlement test, the security that has improved piston rod through all piston rods of evidence.
Claims (2)
1. the anti-hydrogen embrittlement electroplating process of a piston rod of vehicle shock absorber may further comprise the steps: 1) hang on the chromium plating line piston rod automatically; 2) electroplate preceding electrolytic degreasing: piston rod is placed the lye vat electrolytic degreasing; 3) anode etching: piston rod as the anodal closure etching, can be improved the surface smoothness of workpiece with the corrosion of the local high spot on the piston rod surface microcosmic; 4) electroplate the tiny crack hard chrome: place bath trough to electroplate the tiny crack hard chrome in piston rod; 5) clean: be used to clean workpiece and reclaim electroplate liquid; 6) chromium plating line piston rod is hung down automatically, it is characterized in that in step 2 piston rod is as anode electrolytic degreasing in lye vat; In step 4, plating bath flows in coating bath from the bottom up, until overflowing coating bath.
2. the anti-hydrogen embrittlement electroplating process of piston rod of vehicle shock absorber as claimed in claim 1, it is characterized in that after step 6, also need carrying out the dehydrogenation operation: under piston rod, hang in back 16 hours, workpiece is placed in the process furnace of 195 ℃ ~ 215 ℃ of temperature, soaking time was greater than 1.5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010173991 CN101812709A (en) | 2010-05-17 | 2010-05-17 | Anti-hydrogen embrittlement electroplating process of piston rod of vehicle shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010173991 CN101812709A (en) | 2010-05-17 | 2010-05-17 | Anti-hydrogen embrittlement electroplating process of piston rod of vehicle shock absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101812709A true CN101812709A (en) | 2010-08-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010173991 Pending CN101812709A (en) | 2010-05-17 | 2010-05-17 | Anti-hydrogen embrittlement electroplating process of piston rod of vehicle shock absorber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101812709A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105239139A (en) * | 2015-11-16 | 2016-01-13 | 中船重工中南装备有限责任公司 | Continuous chromeplating device and method for large rod |
| CN105586613A (en) * | 2014-10-22 | 2016-05-18 | 北京实验工厂 | Hard chromium plating method and solution formula for piston rod class parts |
| CN115284012A (en) * | 2021-12-27 | 2022-11-04 | 天津北特汽车零部件有限公司 | An automated production line for friction-welded hollow shock absorber piston rods |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056134A (en) * | 1991-03-26 | 1991-11-13 | 中国石油天然气总公司第二石油机械厂 | Continuous chromium plating for super long shaft and equipment |
-
2010
- 2010-05-17 CN CN 201010173991 patent/CN101812709A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056134A (en) * | 1991-03-26 | 1991-11-13 | 中国石油天然气总公司第二石油机械厂 | Continuous chromium plating for super long shaft and equipment |
Non-Patent Citations (2)
| Title |
|---|
| 《内燃机车检修》 19940228 朱志英等 镀铬工艺简介 中国铁道出版社 50 1-2 , 1 * |
| 《电镀手册》 19970731 张允诚等 电化学除油 国防工业出版社 148-149 1-2 , 1 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105586613A (en) * | 2014-10-22 | 2016-05-18 | 北京实验工厂 | Hard chromium plating method and solution formula for piston rod class parts |
| CN105239139A (en) * | 2015-11-16 | 2016-01-13 | 中船重工中南装备有限责任公司 | Continuous chromeplating device and method for large rod |
| CN115284012A (en) * | 2021-12-27 | 2022-11-04 | 天津北特汽车零部件有限公司 | An automated production line for friction-welded hollow shock absorber piston rods |
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Application publication date: 20100825 |