CN106350854B - A kind of passivating method of chrome-bearing steel muscle - Google Patents
A kind of passivating method of chrome-bearing steel muscle Download PDFInfo
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- CN106350854B CN106350854B CN201610826857.8A CN201610826857A CN106350854B CN 106350854 B CN106350854 B CN 106350854B CN 201610826857 A CN201610826857 A CN 201610826857A CN 106350854 B CN106350854 B CN 106350854B
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/36—Phosphatising
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
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Abstract
The present invention relates to a kind of passivating methods of chrome-bearing steel muscle, belong to field of metal material surface treatment.The passivating method includes the following steps.Pretreatment: it using reinforcing bar workpiece as cathode, is immersed simultaneously with anode in the carbonate or phosphate wash liquid that mass fraction is 5%-15%, and apply DC electric field between electrodes, removes workpiece surface greasy dirt and oxide skin.Surface passivation: exchange positive and negative anodes make workpiece as anode, continue to DC electric field certain time, form the passivating film for stablizing densification on fresh surface.Post-processing: voltage is reduced to workpiece surface plasma disappearance, maintains that after a certain period of time, workpiece is cleaned and dried, technique is completed.The invention using the oxide skin of continuous cathode and anodolyte plasma technique removal rebar surface and forms stable fine and close passivating film, improves reinforcing bar corrosion resistance in environmental-friendly salting liquid.The technical matters be simple and convenient to operate and it is at low cost, pollution is few, be it is a kind of efficiently, the passivating method of environmental protection.
Description
Technical field
The present invention relates to a kind of passivating methods of chrome-bearing steel muscle, belong to field of metal material surface treatment.
Background technique
The corrosion of reinforcing bar is the critical issue of destroying concrete structure.In recent years, it is the corrosion resistance for improving reinforcing bar, adds chromium
Equal alloying elements are to increase its anti-chlorine ion corrosion ability, to develop low-alloy steel bar.But reinforcing bar is in process of production
Surface will form that one layer of binding force be strong, stable oxide skin of the oxide containing iron and hydroxide, lead to rebar surface chromium
The missing of element reduces its tarnishing criticality Cl-Concentration, the due passivation effect of corrosion resistant steel bar disappear, and make its corrosion resistance substantially
Degree decline.The method that pickling is commonly used in engineering is handled, and so that rebar surface is formed form compact and stable passivating film, and improve reinforcing bar
Corrosion resistance.
But to there is complex process, required solvent type more and the disadvantages of take a long time for presently disclosed patent.Such as
Described in the patent of invention (102899683 A of CN) of entitled " a kind of passivation for stainless steel aqueous solution and preparation method thereof ", need using
Nearly ten kinds of solvents including molybdate and a variety of organic phosphoric acids, and required time no less than 30 minutes in passivating process,
Solution preparation is complicated and passivation required time is longer.Patent of invention (the CN of entitled for another example " stainless steel passivation process "
103451646 A) described in, it is needed before passivation using pickling removal surface and oil contaminant and passivating process is also required to 30-60 minutes, work
Skill engineering is complicated.
Summary of the invention
Technical problem: the present invention is intended to provide a kind of passivating method of chrome-bearing steel muscle, to improve the metal materials such as reinforcing bar
Corrosion resistance.It is advantageous that avoiding acid solution in other methods, oxidant and other organic solvents to the pollution of environment and right
The damage of operator's health, and improve process efficiency.
Technical solution: the passivating method of one of present invention chrome-bearing steel muscle, the specific steps are as follows:
1) it pre-processes: using chromium steel muscle workpiece as cathode, being with the mass fraction that immersed simultaneously to electrode as anode
In the carbonate or phosphoric acid salt electrolyte of 5%-15%, and apply DC voltage between electrodes, removes workpiece surface greasy dirt
And oxide skin, expose fresh surface；
2) surface passivation: two electrodes are exchanged, and so that reinforcing bar workpiece is connected with positive pole as anode, to electrode as yin
Pole applies DC voltage between electrodes, and rebar surface is made to form fine and close passivating film；
3) it post-processes: reducing voltage, make workpiece surface plasma disappearance, kept for this voltage certain time, then by workpiece
After taking-up, cleaning, drying.
Wherein:
During pretreatment and surface passivation, the DC voltage applied is higher than 50 volts, workpiece surface can be made in electrolyte
Middle generation plasma, and plasma discharge state can be maintained.
During pretreatment and surface passivation, after the workpiece surface generates plasma in the electrolytic solution, keep respectively
30-600 seconds, it can remove surface and oil contaminant and oxide skin, and form oxidation film on surface.
In last handling process, the reduction voltage is by voltage drop down to plasma disappearance, typically not greater than 70 volts,
And it is kept for 30-500 seconds.
The utility model has the advantages that the invention in environmental-friendly salting liquid, utilizes continuous cathode and anodolyte plasma
Body technique removes rebar surface greasy dirt and oxide skin, and the passivating film for stablizing densification is formed on surface.Simple process, operation side
Just and it is at low cost, pollution is few, be it is a kind of efficiently, the processing method of environmental protection.
Detailed description of the invention
The present invention will be further described below with reference to the drawings.
Fig. 1 is pretreated schematic diagram in the passivating method of chrome-bearing steel muscle in the present invention.
Fig. 2 is the schematic diagram that passivating film is formed in the passivating method of chrome-bearing steel muscle in the present invention.
Fig. 3 a is that the XPS of workpiece chromium before Passivation Treatment schemes.Fig. 3 b is the XPS of workpiece chromium after Passivation Treatment
Figure.
Fig. 4 is Tafel polarization curve of the workpiece before and after Passivation Treatment.
Specific embodiment
One, it pre-processes.Select stainless steel plate or other anti-corrosion conductors as to electrode, will to electrode and workpiece respectively with electricity
The positive and negative electrode in source immerses in salting liquid and connects DC power supply after being connected, and increases voltage, and workpiece surface is made to generate continuous-stable
After plasma, after being kept for 30-600 seconds at the voltage value (being usually above 50 volts), workpiece surface greasy dirt and oxidation are removed
Skin.
Two, surface passivation.Two electrodes are exchanged, so that workpiece is connected with positive pole, as anode.Again two electrodes it
Between apply DC voltage, after workpiece surface generates the plasma of continuous-stable, at the voltage value (being usually above 50 volts)
After being kept for 30-600 seconds, rebar surface is made to form fine and close passivating film.
Three, it post-processes.Voltage is reduced up to workpiece surface plasma disappearance, and in the voltage value (usually less than 70 volts)
Lower holding 30-500 seconds.Finally workpiece is taken out with workpiece control system, is dried after cleaning, technique is completed.
Embodiment one
In the sodium carbonate liquor that mass fraction is 15%, 110 volts are pre-processed 200 seconds；Transfer electron, 110 volts of processing 120
Second carries out surface passivation；50 volts post-process 120 seconds, and form compact and stable passivating film can be formed in workpiece surface.
1. surface preparation
1) sodium carbonate liquor that mass fraction is 15% is prepared, electrolytic cell is poured into, liquor capacity is more than three points of electrolytic cell
Two；
2) stainless steel plate is respectively connected to DC power supply positive and negative anodes (such as Fig. 1 as anode, reinforcing bar workpiece as cathode
It is shown)；
3) anode is immersed in sodium carbonate liquor, cathode-workpiece is immersed by workpiece control system, connects direct current
Source increases voltage and closes after being kept for 150 seconds at the voltage value after workpiece surface generates the plasma of steady and continuous to 110V
Close power supply；
2. surface passivation
1) conversion electric power cathode and anode makes workpiece be connected (as shown in Figure 2) with positive pole；
2) it brings the voltage up to 110V, after workpiece surface generates the plasma of steady and continuous, is kept at the voltage value
200 seconds；
3. post-processing
1) voltage is reduced to 50 volts, and workpiece surface plasma disappearance keeps the voltage to close power supply after 120 seconds；
2) workpiece is taken out with workpiece control system, cleans, dries.
Embodiment two
In the sodium carbonate liquor that mass fraction is 10%, 120 volts are pre-processed 120 seconds；Transfer electron, 100 volts of processing 120
Second carries out surface passivation；60 volts post-process 100 seconds, and form compact and stable passivating film can be formed in workpiece surface.
1. surface preparation
1) sodium carbonate liquor that mass fraction is 10% is prepared, electrolytic cell is poured into, liquor capacity is more than three points of electrolytic cell
Two；
2) stainless steel plate is respectively connected to DC power supply positive and negative anodes (such as Fig. 1 as anode, reinforcing bar workpiece as cathode
It is shown)；
3) anode is immersed in sodium carbonate liquor, cathode-workpiece is immersed by workpiece control system, connects direct current
Source increases voltage and closes after being kept for 120 seconds at the voltage value after workpiece surface generates the plasma of steady and continuous to 120V
Close power supply；
2. surface passivation
1) cathode and anode is converted, workpiece is made to be connected (as shown in Figure 2) with positive pole；
2) it brings the voltage up to 100V, after workpiece surface generates the plasma of steady and continuous, is kept at the voltage value
120 seconds；
3. post-processing
1) voltage is reduced to 60 volts, and workpiece surface plasma disappearance keeps the voltage to close power supply after 100 seconds；
2) workpiece is taken out with workpiece control system, cleans, dries.
Embodiment three
In the sodium radio-phosphate,P-32 solution that mass fraction is 8%, 130 volts are pre-processed 120 seconds；Transfer electron, 110 volts of processing 120
Second carries out surface passivation；60 volts post-process 120 seconds, and form compact and stable passivating film can be formed in workpiece surface.
1. surface preparation
1) prepare the sodium radio-phosphate,P-32 solution that mass fraction is 8%, pour into electrolytic cell, liquor capacity be more than electrolytic cell three/
Two；
2) stainless steel plate is respectively connected to DC power supply positive and negative anodes (such as Fig. 1 as anode, reinforcing bar workpiece as cathode
It is shown)；
3) anode is immersed in sodium radio-phosphate,P-32 solution, cathode-workpiece is immersed by workpiece control system, connects direct current
Source increases voltage to 130V, after workpiece surface generates the plasma of steady and continuous, breaks after being kept for 120 seconds at the voltage value
Switch power supply；
2. surface passivation
1) cathode and anode is converted, workpiece is made to be connected (as shown in Figure 2) with positive pole；
2) it brings the voltage up to 110V, after workpiece surface generates the plasma of steady and continuous, is kept at the voltage value
120 seconds；
3. post-processing
1) voltage is reduced to 60 volts, and workpiece surface plasma disappearance keeps the voltage to close power supply after 120 seconds；
2) workpiece is taken out with workpiece control system, cleans, dries.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, belong to the present invention claims protection scope.
Claims (2)
1. a kind of passivating method of chrome-bearing steel muscle, it is characterised in that the passivating method the following steps are included:
1) it pre-processes: being 5%- with the mass fraction that immersed simultaneously to electrode as anode using chromium steel muscle workpiece as cathode
In 15% carbonate or phosphoric acid salt electrolyte, and apply DC voltage between electrodes, remove workpiece surface greasy dirt and
Oxide skin exposes fresh surface；
2) surface passivation: two electrodes are exchanged, and so that reinforcing bar workpiece is connected with positive pole and are used as anode, to electrode as cathode,
Apply DC voltage between electrodes, rebar surface is made to form fine and close passivating film；
3) it post-processes: reducing voltage, make workpiece surface plasma disappearance, kept for this voltage certain time, then workpiece is taken out
Afterwards, cleaning, drying；
Wherein,
During pretreatment and surface passivation, the DC voltage applied is higher than 50 volts, workpiece surface can be made to produce in the electrolytic solution
Raw plasma, and plasma discharge state can be maintained；
During pretreatment and surface passivation, after the workpiece surface generates plasma in the electrolytic solution, 30- is kept respectively
600 seconds, it can remove surface and oil contaminant and oxide skin, and form oxidation film on surface.
2. the passivating method of chrome-bearing steel muscle according to claim 1, it is characterised in that in last handling process, the reduction electricity
Pressure is voltage drop to be no more than 70 volts down to plasma disappearance, and kept for 30-500 seconds.
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| CN108505099A (en) * | 2018-04-20 | 2018-09-07 | 安徽省康宇水电机械成套设备有限公司 | A kind of vehicle bridge lower thrust rod bearing anticorrosion treatment technology |
| CN114273343A (en) * | 2022-01-18 | 2022-04-05 | 中国石油大学(华东) | In-situ electrofluidic decontamination method and application |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5741398A (en) * | 1980-08-25 | 1982-03-08 | Nippon Kinzoku Kk | Surface treatment of stainless steel |
| CN1030621A (en) * | 1987-05-15 | 1989-01-25 | 厦门大学 | Method for surface corrosive treatment of stainless steel |
| CN1721578A (en) * | 2005-05-23 | 2006-01-18 | 狄士春 | Microarc oxidation process method for surface of steel and ion |
| CN1737211A (en) * | 2005-07-04 | 2006-02-22 | 江门市福斯特金属表面处理技术发展有限公司 | Differential arc oxidization abrasive polishing method for stainless steel surface |
| CN101412635A (en) * | 2007-10-16 | 2009-04-22 | 同济大学 | Electrochemical realkalization method for carbonizing reinforced concrete |
| CN101701349A (en) * | 2009-12-11 | 2010-05-05 | 吴良坤 | Band steel oxidized surface processing device and surface processing method |
| CN103255464A (en) * | 2013-05-23 | 2013-08-21 | 浙江工贸职业技术学院 | Film-forming solution for forming electrochemical oxide film on surface of steel, application method thereof and film formed therefrom |
| CN105887176A (en) * | 2016-06-22 | 2016-08-24 | 东南大学 | Rebar cleaning method |
-
2016
- 2016-09-14 CN CN201610826857.8A patent/CN106350854B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5741398A (en) * | 1980-08-25 | 1982-03-08 | Nippon Kinzoku Kk | Surface treatment of stainless steel |
| CN1030621A (en) * | 1987-05-15 | 1989-01-25 | 厦门大学 | Method for surface corrosive treatment of stainless steel |
| CN1721578A (en) * | 2005-05-23 | 2006-01-18 | 狄士春 | Microarc oxidation process method for surface of steel and ion |
| CN1737211A (en) * | 2005-07-04 | 2006-02-22 | 江门市福斯特金属表面处理技术发展有限公司 | Differential arc oxidization abrasive polishing method for stainless steel surface |
| CN101412635A (en) * | 2007-10-16 | 2009-04-22 | 同济大学 | Electrochemical realkalization method for carbonizing reinforced concrete |
| CN101701349A (en) * | 2009-12-11 | 2010-05-05 | 吴良坤 | Band steel oxidized surface processing device and surface processing method |
| CN103255464A (en) * | 2013-05-23 | 2013-08-21 | 浙江工贸职业技术学院 | Film-forming solution for forming electrochemical oxide film on surface of steel, application method thereof and film formed therefrom |
| CN105887176A (en) * | 2016-06-22 | 2016-08-24 | 东南大学 | Rebar cleaning method |
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