CN103924273B - A kind of process technique of corrosion resistance seamless steel pipe - Google Patents
A kind of process technique of corrosion resistance seamless steel pipe Download PDFInfo
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- CN103924273B CN103924273B CN201410099639.XA CN201410099639A CN103924273B CN 103924273 B CN103924273 B CN 103924273B CN 201410099639 A CN201410099639 A CN 201410099639A CN 103924273 B CN103924273 B CN 103924273B
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Abstract
The present invention relates to the process technique of a kind of corrosion resistance seamless steel pipe, this technique uses pipe forming processes, cleaning treatment, materials in the tube electronickelling to process, carry out chromium plating process and secondary check, at materials in the tube electroplating nickel on surface, electroplate liquid formulation is: nickel sulfate 290 300 g/l, Nickel dichloride. 43 45 g/l, boric acid 42 45 g/l, using one section of electric current is 1200A, Shi Changwei 3min, when two-stage nitration electric current is 2400A, time a length of 5min；Draw, after using said method, the excellent properties that salt spray test >=7 grade can be stably reached, meet the use requirement in coastal area of motor vehicle components special steel pipe, contrast the conventional use of chromed hardened method of single electricity and had bigger technological progress, improve the decay resistance of motor vehicle components.
Description
Technical field
The present invention relates to seamless steel pipe, be related specifically to the surface science and engineering of a kind of motor vehicle components special steel pipe
Skill.
Background technology
At present, existing for motor vehicles special steel pipe production technology generally use electric chromed hardened method improve corrosion resistance
Can, although plating hard chrome can meet general anticorrosive requirement, but in corresponding GB (GB/T10125 and 6461) standard grading
Time, using plating hard chrome to process the standard reached is 3-6 level, and quality is unstable, especially in coastal area, due to weather
Moistening and contain salt, after using six months, partial tube surface there will be seriously corroded, thus shortens the use longevity of car part pipe
Life, then how during making pipe fitting, by control being carried out physical or chemical treatment, improve automobile-use steel pipe corrosion resistant
Erosion performance becomes problem in the urgent need to address.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of use at times with the gradual electroplating technology that automatically controls, system
Make the seamless steel pipe with higher weatherability corrosive nature.
In order to solve above-mentioned technical problem, the invention provides the process technique of a kind of corrosion resistance seamless steel pipe, this work
Skill comprises the steps:
Step 1: pipe forming processes；
Use carbon steel or the solid pipe billet of steel alloy, bore a hole through perforating machine, roll into hollow heavy wall hollow billet, use
Cold-drawing technology is processed into common seamless pipe, then rolls into precision seamless steel tubes through finishing mill, and precision seamless steel tubes is sawed into car part
After the length of pipe, make car part pipe semi-finished product (materials in the tube before Du) through operations such as aligning, grinding, Vehicle Processings.
Step 2: cleaning treatment；
First by dispensing box, clean pump and be cleaned by equipment one scavenger circuit system of composition；Configure scale removal and then
Abluent, uses automated procedures to control to clean, and the cleaning frequency is circulated cleaning, materials in the tube is carried out high temperature oil removing, chemistry removes
Oil, uses ultrasound wave clear water spray clean water, the high-frequency oscillation signal that supersonic generator sends, passes through ultrasonic transducer
It is converted into high frequency mechanical oscillation and travels to medium, stick to the lubricant of cold rolling rear bore area on cleaning part surface, grinding
After the solids such as fine metal particle of surface attachment not easy-clear i.e. depart from such that it is able to clean the inner surface of materials in the tube；
Step 3: materials in the tube electronickelling processes；
Putting in coating bath by materials in the tube after cleaning, coating bath temperature is 50 DEG C-60 DEG C, utilizes reverse pulse current to peel off materials in the tube
Outer surface impurity, the anodic solution of its reverse impulse makes cathode surface concentration of metal ions go up rapidly, the anode of reverse impulse
Peel off the attached minimizing of folder of the organic impurities made in coating.
At materials in the tube electroplating nickel on surface, electroplate liquid formulation is: nickel sulfate 290-300 g/l, Nickel dichloride. 43-45 g/l, boric acid
42-45 g/l。
Nickel sulfate is the main salt in nickel liquid, and the percentage of nickel-plating liquid is 40-50%, nickel salt content change greatly nickel
Salt content is high, and deposition velocity is moderate, and boric acid is used as buffer agent, and the pH value of nickel-plating liquid is 3.8-5.5, uses one section of electric current to be
1200A, time a length of 3min, when two-stage nitration electric current is 2400A, time a length of 5min, use at times, gradual, thickness of coating is 4-5
μm, after electro-nickel process completes, uses clear water spray materials in the tube surface；
Step 4: materials in the tube electrodeposited chromium processes；
In chrome-plating bath, allotment chromic acid concentration is 20-30%, carries out chromium plating process.
Set one section of electric current 1800A time, time a length of 6min.Along with electrode potential rises, electric current density rises, along with electricity
Electrode potential continues to rise, and electric current density transfers decline to, hereafter forms cathodic coating, along with electrode potential continues to rise, and electric current density
Transfer again rising to.Set two-stage nitration electric current as 3000A, time a length of 26min, use at times, gradual, thickness of coating is 15-18
μm；
Step 5: inspection for the first time；
Whether inspection coating is 19-23 μm, and whether materials in the tube surfaces externally and internally touches scratch, plating tumor, crackle, peeling；
Step 6: mechanical polishing；
Use essence throwing mode, mainly use grinding fluid；
Step 7: second time inspection
Extraction sample, uses 48 hours, does salt spray test；
Step 8: packaging warehouse-in；
As a further improvement on the present invention, in described step 3 and step 4, mode current controls to use electricity at times
Brain programme-control.
Using as above after technical scheme, it has the beneficial effect that.
In step 2, using ultrasound wave clear water spray clear, water cleans the high-frequency oscillation signal that supersonic generator sends,
Being converted into high frequency mechanical oscillation by ultrasonic transducer and travel to medium, ultrasound wave is density interphase in ultrasonic cleaning solution
Forward directed radiation, make liquid flowing and produce ten hundreds of micro-bubbles, the micro-bubble being present in liquid is in sound field
Producing ultrasonic activation under effect, when acoustic pressure reaches certain value, bubble increases rapidly, closes the most suddenly, closes at bubble
Time produce shock wave, producing thousands of atmospheric pressures about, destroying insoluble dirt and to make them be scattered in ultrasound wave clear
In washing liquid, stick to the thin of the surface attachment not easy-clear after the lubricant of cold rolling rear bore area on cleaning part surface, grinding
The solids such as micro-metallic i.e. depart from, thus reach the purpose of cleaning part surface cleaning.
In step 3 and step 4, electronickelling, electrodeposited chromium technique use at times, gradual control, it is ensured that coating
Uniformity, coating total length error is little, can control within 0.1mm.Meanwhile, segmented current controls to make the hole of coating
Rate is controlled effectively, and strengthens the ability of resisting salt fog corrosion, temperature controlled accurately for ensureing parameter chromic acid concentration, coating bath
Property, the most all use measurement display system automatically to show control in real time, the electric current in technical process, time control all to use
Computer program controls.
When the percentage of nickel-plating liquid is more than 50%, nickel salt content is high, it is possible to use higher cathode-current density, heavy
Long-pending speed is fast, is commonly used for high-speed plating thickness nickel.But excessive concentration will reduce cathodic polarization, dispersibility is poor, and the band of plating solution
Go out loss big.Nickel salt content low deposition speed is low, but dispersibility is fine, can obtain the careful bright coating of crystallization, so plating
The percentage of nickel liquid is 40-50%, and deposition velocity is moderate.
The pH value of nickel-plating liquid is that 3.8-5.5 is optimal, in practice it has proved that, when the pH value of nickel-plating liquid is too low, cathode current will be made to imitate
Rate declines；And pH value too high time, due to the continuous precipitation of H2, make the pH value of liquid layer near cathode surface raise rapidly, lead
The generation of cause Ni (OH) 2 colloid, and Ni (OH) 2 being mingled with in coating, make coating fragility increase, and Ni (OH) 2 colloid exists simultaneously
The absorption of electrode surface, also can cause bubble hydrogen in the delay of electrode surface, and boric acid does not only have pH cushioning effect, and he can carry
High cathodic polarization, thus improve plating solution performance, reducing " burning " phenomenon at higher current densities, the existence of boric acid also helps
Improve the mechanical performance of coating.
According to GB/T10125-1997(artificial atmosphere corrosion testing) and GB/T6461-2002(metallic matrix on metal and
Other inorganic cover layers sample after corrosion testing and the grading of test specimen) standard, do salt spray test, experimental result is as follows:
By above-mentioned experiment, draw the excellent properties that can stably reach salt spray test >=7 grade, meet motor vehicles zero
The use requirement in coastal area of part special steel pipe, contrasting the conventional use of chromed hardened method of single electricity has had bigger
Technological progress, improves the decay resistance of motor vehicle components.
Detailed description of the invention
The process technique of a kind of corrosion resistance seamless steel pipe, this technique comprises the steps:
Step 1: pipe forming processes；
Use carbon steel or the solid pipe billet of steel alloy, bore a hole through perforating machine, roll into hollow heavy wall hollow billet, use
Cold-drawing technology is processed into common seamless pipe, then rolls into precision seamless steel tubes through finishing mill, and precision seamless steel tubes is sawed into car part
After the length of pipe, make car part pipe semi-finished product (materials in the tube before Du) through operations such as aligning, grinding, Vehicle Processings.
Step 2: cleaning treatment；
First by dispensing box, clean pump and be cleaned by equipment one scavenger circuit system of composition；Configure scale removal and then
Abluent, uses automated procedures to control to clean, and the cleaning frequency is circulated cleaning, materials in the tube is carried out high temperature oil removing, chemistry removes
Oil, uses ultrasound wave clear water spray clean water, the high-frequency oscillation signal that supersonic generator sends, passes through ultrasonic transducer
It is converted into high frequency mechanical oscillation and travels to medium, stick to the lubricant of cold rolling rear bore area on cleaning part surface, grinding
After the solids such as fine metal particle of surface attachment not easy-clear i.e. depart from such that it is able to clean the inner surface of materials in the tube；
Step 3: materials in the tube electronickelling processes；
Putting in coating bath by materials in the tube after cleaning, coating bath temperature is 50 DEG C-60 DEG C, utilizes reverse pulse current to peel off materials in the tube
Outer surface impurity, the anodic solution of its reverse impulse makes cathode surface concentration of metal ions go up rapidly, the anode of reverse impulse
Peel off the attached minimizing of folder of the organic impurities made in coating.
At materials in the tube electroplating nickel on surface, electroplate liquid formulation is: nickel sulfate 290-300 g/l, Nickel dichloride. 43-45 g/l, boric acid
42-45 g/l。
Nickel sulfate is the main salt in nickel liquid, and the percentage of nickel-plating liquid is 40-50%, nickel salt content change greatly nickel
Salt content is high, and deposition velocity is moderate, and boric acid is used as buffer agent, and the pH value of nickel-plating liquid is 3.8-5.5, uses one section of electric current to be
1200A, time a length of 3min, when two-stage nitration electric current is 2400A, time a length of 5min, use at times, gradual, thickness of coating is 4-5
μm, after electro-nickel process completes, uses clear water spray materials in the tube surface；
Step 4: materials in the tube electrodeposited chromium processes；
In chrome-plating bath, allotment chromic acid concentration is 20-30%, carries out chromium plating process.
Set one section of electric current 1800A time, time a length of 6min.Along with electrode potential rises, electric current density rises, along with electricity
Electrode potential continues to rise, and electric current density transfers decline to, hereafter forms cathodic coating, along with electrode potential continues to rise, and electric current density
Transfer again rising to.Set two-stage nitration electric current as 3000A, time a length of 26min, use at times, gradual, thickness of coating is 15-18
μm；
Step 5: inspection for the first time；
Whether inspection coating is 19-23 μm, and whether materials in the tube surfaces externally and internally touches scratch, plating tumor, crackle, peeling；
Step 6: mechanical polishing；
Use essence throwing mode, mainly use grinding fluid；
Step 7: second time inspection
Extraction sample, uses 48 hours, does salt spray test；
Step 8: packaging warehouse-in；
After testing, meet GB/T10125-1997(artificial atmosphere corrosion testing) and GB/T6461-2002(metallic matrix on
Sample after corrosion testing of metal and other inorganic cover layers and the grading of test specimen) standard, testing result such as subordinate list:
Claims (2)
1. the process technique of a corrosion resistance seamless steel pipe, it is characterised in that: this technique comprises the steps:
Step 1: pipe forming processes；
Use carbon steel or the solid pipe billet of steel alloy, bore a hole through perforating machine, roll into hollow heavy wall hollow billet, use cold-drawn
PROCESS FOR TREATMENT becomes common seamless pipe, then rolls into precision seamless steel tubes through finishing mill, and precision seamless steel tubes is sawed into car part pipe
Length after, make car part pipe semi-finished product through aligning, grinding, Vehicle Processing operation；
Step 2: cleaning treatment；
First by dispensing box, clean pump and be cleaned by equipment one scavenger circuit system of composition；Configure descaling rinsing and then
Agent, uses automated procedures to control to clean, and scavenger circuit system is circulated cleaning, materials in the tube is carried out high temperature oil removing, chemistry removes
Oil, uses ultrasound wave clear water spray clean water, the high-frequency oscillation signal that supersonic generator sends, passes through ultrasonic transducer
It is converted into high frequency mechanical oscillation and travels to medium, stick to the lubricant of cold rolling rear bore area on cleaning part surface, grinding
After the fine metal particle solids particle of surface attachment not easy-clear i.e. depart from such that it is able to clean the inner surface of materials in the tube；
Step 3: materials in the tube electronickelling processes；
Putting in coating bath by materials in the tube after cleaning, coating bath temperature is 50 DEG C-60 DEG C, utilizes reverse pulse current to peel off the appearance of materials in the tube
Face impurity, the anodic solution of its reverse impulse makes cathode surface concentration of metal ions go up rapidly, and the anode of reverse impulse is peeled off
Make the attached minimizing of folder of organic impurities in coating；
At materials in the tube electroplating nickel on surface, electroplate liquid formulation is: nickel sulfate 290-300 g/l, Nickel dichloride. 43-45 g/l, boric acid 42-45
g/l；
Nickel sulfate is the main salt in nickel liquid, and the percentage of nickel-plating liquid is 40-50%, and the nickel salt that changes greatly of nickel salt content contains
Amount height, deposition velocity is moderate, and boric acid is used as buffer agent, and the pH value of nickel-plating liquid is 3.8-5.5, uses one section of electric current to be
1200A, time a length of 3min, when two-stage nitration electric current is 2400A, time a length of 5min, use at times, gradual, thickness of coating is 4-5
μm, after electro-nickel process completes, uses clear water spray materials in the tube surface；
Step 4: materials in the tube electrodeposited chromium processes；
In chrome-plating bath, allotment chromic acid concentration is 20-30%, carries out chromium plating process；
Set one section of electric current 1800A time, time a length of 6min, along with electrode potential rise, electric current density rise, along with electrode electricity
Position continues to rise, and electric current density transfers decline to, hereafter forms cathodic coating, and along with electrode potential continues to rise, electric current density turns again
For rising；
Set two-stage nitration electric current as 3000A, time a length of 26min, use at times, gradual, thickness of coating is 15-18 μm；
Step 5: inspection for the first time；
Whether inspection coating is 19-23 μm, and whether materials in the tube surfaces externally and internally touches scratch, plating tumor, crackle, peeling；
Step 6: mechanical polishing；
Use essence throwing mode, mainly use grinding fluid；
Step 7: second time inspection
Extraction sample, uses 48 hours, does salt spray test；
Step 8: packaging warehouse-in.
The process technique of corrosion resistance seamless steel pipe the most according to claim 1, it is characterised in that: described step 3 and
In step 4, mode current controls to use computer program to control at times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410099639.XA CN103924273B (en) | 2014-03-18 | A kind of process technique of corrosion resistance seamless steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410099639.XA CN103924273B (en) | 2014-03-18 | A kind of process technique of corrosion resistance seamless steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103924273A CN103924273A (en) | 2014-07-16 |
| CN103924273B true CN103924273B (en) | 2016-11-30 |
Family
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85202400U (en) * | 1985-06-18 | 1986-05-07 | 徐宏镕 | Chromium plating cyclinder jacket with thin stell pipe |
| JPH04158908A (en) * | 1990-10-19 | 1992-06-02 | Nippon Steel Corp | Manufacture of seamless steel tube of dupley stainless steel excellent in outside surface quality of tube |
| JPH05305A (en) * | 1991-02-01 | 1993-01-08 | Nippon Steel Corp | Manufacture of seamless tube of high chromium steel excellent in quality of outer surface of tube |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85202400U (en) * | 1985-06-18 | 1986-05-07 | 徐宏镕 | Chromium plating cyclinder jacket with thin stell pipe |
| JPH04158908A (en) * | 1990-10-19 | 1992-06-02 | Nippon Steel Corp | Manufacture of seamless steel tube of dupley stainless steel excellent in outside surface quality of tube |
| JPH05305A (en) * | 1991-02-01 | 1993-01-08 | Nippon Steel Corp | Manufacture of seamless tube of high chromium steel excellent in quality of outer surface of tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200113 Address after: Building 1 and building 3, No.23, No.21, marlou Road, Jiulong Town, Hailing District, Taizhou City, Jiangsu Province Patentee after: Taizhou Shuangma Energy Saving Technology Co.,Ltd. Address before: 225300 Ma Lou Road, Jiulong Industrial Park, Jiangsu, Taizhou Patentee before: TAIZHOU SHUANGYANG PRECISION SEAMLESS STEEL TUBE CO.,LTD. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 |