CN107604351B - A kind of carbon steel surface treatment method - Google Patents
A kind of carbon steel surface treatment method Download PDFInfo
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- CN107604351B CN107604351B CN201710882089.2A CN201710882089A CN107604351B CN 107604351 B CN107604351 B CN 107604351B CN 201710882089 A CN201710882089 A CN 201710882089A CN 107604351 B CN107604351 B CN 107604351B
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Abstract
The present invention provides a kind of carbon steel surface treatment methods, comprising: carbon steel is carried out shot blasting on surface processing；Blackening process is carried out to the carbon steel surface after bead.Compared with prior art, shot blasting on surface and blackening process are effectively combined by carbon steel surface treatment method provided by the invention, tiny, uniform, fine and close by the crystalline particle for first carrying out the black film that bead can be such that subsequent blackening process is formed to carbon steel surface；And the corrosion potential of black film can also be made to improve by bead, corrosion current density reduction；The resistance of black film can also be made to increase by bead simultaneously, salt water resistance immersion ability it is stronger.Therefore, the present invention can be improved the corrosion resistance for the black film being prepared by carrying out bead before blackening process.
Description
Technical field
The present invention relates to carbon steel technical field more particularly to a kind of carbon steel surface treatment methods.
Background technique
Carbon steel is widely used in steel construction, but its corrosion problem seriously affects steel member service life and safety, causes
Huge economic losses.Forming protectiveness film layer on carbon steel surface is the effective ways for alleviating corrosion of carbon steel.Blackening process is a kind of
Simple and efficient film build method, using universal.Metal surface is isolated from the environment by the black film that blackening process is formed, thus
Play protective action.
The black film compact structure of prior art preparation is lower, is not able to satisfy during steel member storage and corrosion-resistant wants
It asks.Therefore, new carbon steel process for treating surface is researched and developed, nigrescence film properties are improved, becomes the hot spot of those skilled in the art's concern.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of carbon steel surface treatment method, method energy provided by the invention
Enough make the black film to be formed that there is preferable performance.
The present invention provides a kind of carbon steel surface treatment methods, comprising:
Carbon steel is subjected to shot blasting on surface processing；
Blackening process is carried out to the carbon steel surface after bead.
The present invention does not have special limitation to the type of the carbon steel and source, using carbon well known to those skilled in the art
Steel.
In the present invention, the bead is preferably ultrasonic shot peening processing.
In the present invention, the method for the bead is preferred are as follows:
The bullet of 4~6mm diameter is first used to carry out the shot-peening of 15~30min on carbon steel surface；
Then the shot-peening of 40~60min is carried out using the bullet of 2~3.5mm diameter again.
The present invention preferably first carries out the shot-peening of short time using bulky grain bullet, is then grown again using little particle bullet
The shot-peening of time, carrying out bead using the method for this two steps shot-peening can be such that the black film of subsequent preparation has preferably
Corrosion resistance.
In the present invention, after the completion of the bead it is also preferable to include:
Product after bead is subjected to oil removal treatment.
In the present invention, the temperature of the oil removal treatment is preferably 70~80 DEG C；The time of the oil removal treatment is preferably 8
~12min.
In the present invention, the degreaser that the oil removal treatment uses preferably includes:
Sodium hydroxide, sodium carbonate, sodium metasilicate and water.
In the present invention, concentration of the sodium hydroxide in degreaser is preferably 13~17g/L；The sodium carbonate is removing
Concentration in finish is preferably 8~12g/L；Concentration of the sodium metasilicate in degreaser is preferably 8~12g/L.
In the present invention, after the completion of the oil removal treatment, it is also preferable to include:
Product after oil removal treatment is rinsed with clear water.
In the present invention, after the completion of the oil removal treatment, it is also preferable to include:
Product after oil removal treatment is subjected to acid pickling and rust removing.
In the present invention, the pickling solution of the acid pickling and rust removing preferably includes:
Sulfuric acid, hydrochloric acid, nitric acid and water.
In the present invention, concentration of the sulfuric acid in pickling solution is preferably 145~155mL/L；The hydrochloric acid is in pickling
Concentration in liquid is preferably 300~310mL/L；Concentration of the nitric acid in pickling solution is preferably 50~60mL/L.
In the present invention, after the acid pickling and rust removing it is also preferable to include:
Product after acid pickling and rust removing is rinsed with clear water.
In the present invention, the temperature of the blackening process is preferably 130~150 DEG C, more preferably 135~145 DEG C, optimal
It is selected as 140 DEG C；The time of the blackening process is preferably 20~40min, more preferably 25~35min, most preferably 30min.
In the present invention, the hair blackening liquid of the blackening process preferably includes:
Sodium hydroxide, sodium nitrite, sodium nitrate and water.
In the present invention, concentration of the sodium hydroxide in hair blackening liquid is preferably 595~705g/L；The sodium nitrite
Concentration in hair blackening liquid is preferably 175~225g/L, more preferably 185~215g/L, most preferably 200g/L；The nitric acid
Concentration of the sodium in hair blackening liquid is preferably 45~75g/L, more preferably 55~65g/L, most preferably 60g/L.
In the present invention, the average diameter of the crystalline particle of the black film formed after the blackening process on carbon steel surface is excellent
It is selected as 10~20 μm.
Compared with prior art, carbon steel surface treatment method provided by the invention has shot blasting on surface and blackening process
The combination of effect, by the crystalline particle for first carrying out the black film that bead can be such that subsequent blackening process is formed to carbon steel surface
It is tiny, uniform, fine and close；And the corrosion potential of black film can also be made to improve by bead, corrosion current density
It reduces；The resistance of black film can also be made to increase by bead simultaneously, salt water resistance immersion ability it is stronger.Therefore, of the invention
It can be improved the corrosion resistance for the black film being prepared by carrying out bead before blackening process.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the workpiece surface micro-organization chart that the embodiment of the present invention 1 does not carry out bead；
Fig. 2 is that the embodiment of the present invention 1 carries out the workpiece surface micro-organization chart after bead；
Fig. 3 is the shape appearance figure of the black film of comparative example 1 of the present invention preparation；
Fig. 4 is the shape appearance figure of black film prepared by the embodiment of the present invention 1；
Fig. 5 is the black film for preparing of the embodiment of the present invention 1 and comparative example 1 in the NaCl solution that mass concentration is 3.5%
Polarization curve.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Raw materials used following embodiment of the present invention is commercial goods.
Embodiment 1
Carbon steel work-piece having a size of 15 × 10 × 4mm is first carried out at the ultrasonic shot peening of 30min with the bullet that diameter is 4mm
It manages, then the bullet for being 2mm with diameter carries out the ultrasonic shot peening processing of 60min；
Workpiece after bead is used into electrochemical deoiling agent oil removing 12min under the conditions of 70 DEG C, electrochemical deoiling agent includes: hydrogen
Sodium oxide molybdena, sodium carbonate, sodium metasilicate and water, concentration of the sodium hydroxide in electrochemical deoiling agent are 13g/L, and sodium carbonate is in electrochemical deoiling
Concentration in agent is 12g/L, and concentration of the sodium metasilicate in electrochemical deoiling agent is 12g/L, rinses workpiece with clear water after oil removing；
Workpiece after oil removing is subjected to acid pickling and rust removing under normal temperature conditions, pickling solution includes sulfuric acid, hydrochloric acid, nitric acid and water,
Concentration of the sulfuric acid in pickling solution is 150ml/L, and concentration of the hydrochloric acid in pickling solution is 300ml/L, and nitric acid is in pickling solution
Concentration is 50ml/L, rinses workpiece with clear water after acid pickling and rust removing；
Workpiece after acid pickling and rust removing is subjected to blackening process 50min under the conditions of 140 DEG C, hair blackening liquid include: sodium hydroxide,
Sodium nitrite, sodium nitrate and water, concentration of the sodium hydroxide in hair blackening liquid are 650g/L, concentration of the sodium nitrite in hair blackening liquid
For 200g/L, concentration of the sodium nitrate in hair blackening liquid is 60g/L, and the workpiece after blackening process is rinsed with clear water, is dried in the air at room temperature
It is dry to form black film in workpiece surface.
Microstructure observation is carried out to the workpiece surface before and after 1 bead of the embodiment of the present invention, as a result such as Fig. 1 and Fig. 2
Shown, Fig. 1 is the workpiece surface micro-organization chart that the embodiment of the present invention 1 does not carry out bead, and Fig. 2 is the embodiment of the present invention 1
Workpiece surface micro-organization chart after carrying out bead.By Fig. 1 and Fig. 2 it is found that after bead workpiece surface crystalline substance
Rheology occurs for grain, and crystal boundary thickens, and acutely refinement occurs for crystal grain, and size reduces.
Comparative example 1
Carbon steel work-piece surface treatment is carried out according to the method for embodiment 1, the difference from embodiment 1 is that, without shot-peening
Processing forms black film on carbon steel work-piece surface.
Embodiment 2
The black film prepared to the embodiment of the present invention 1 and comparative example 1 carries out structure observation, observes result such as Fig. 3 and Fig. 4 institute
Show, Fig. 3 is the shape appearance figure of the black film of comparative example 1 of the present invention preparation, and Fig. 4 is the shape of black film prepared by the embodiment of the present invention 1
Looks figure, as can be seen from figs. 3 and 4, the continuity for not carrying out the black film crystalline particle of bead preparation grinds scratch in matrix
Place is destroyed, these edges and corners are likely to become the weak location of black film, influences its etch-proof protective effect；And black
The crystalline particle size of film is larger, and average diameter is about 30 μm.The black film prepared after bead it is finer and closely woven uniformly,
Defect is less, and the size of black film crystalline particle is smaller, and average diameter is 15 μm.Therefore, shot-peening is carried out to carbon steel surface
Processing can promote the formation of its surface blackening film, keep black film more continuous, uniform, fine and close, crystal size reduces 50%.
Embodiment 3
The black film that the embodiment of the present invention 1 and comparative example 1 are prepared is in the NaCl solution that mass concentration is 3.5%
Electrochemical corrosion behavior survey is carried out using the CHI700E Series Electrochemical work station that CH Instruments Ins company provides
Examination, test result is as shown in figure 5, it in mass concentration is 3.5% that Fig. 5, which is the black film for preparing of the embodiment of the present invention 1 and comparative example 1,
NaCl solution in polarization curve.
As shown in Figure 5, the polarization of the black film of the non-bead of comparing preparation, the black film prepared after bead is bent
Line position changes, and mobile significant to upper left side, i.e., corrosion potential is shuffled, and corrosion current density reduces.By calculating
It obtains, the corrosion potential of the black film without bead preparation is -0.86V, and corrosion current density is 2.455 × 10- 5A/cm2；The corrosion potential of the black film prepared after bead be -0.69V, corrosion current density be 0.398 ×
10-5A/cm2.The corrosion potential of the black film of preparation is set to shuffle 170mV, corrosion current it follows that carrying out bead
Density reduces about 85%.Therefore, carrying out bead can be improved the corrosion resistance of the subsequent black film being prepared.
Embodiment 4
Carry out carbon steel work-piece surface treatment according to the method for embodiment 1 is only with diameter unlike the first embodiment
The bullet of 4mm carries out the ultrasonic shot peening processing of 90min, forms black film on carbon steel work-piece surface.
The corrosion potential of the black film prepared according to the method test embodiment of the present invention 4 of embodiment 3 is -0.71V, from
Corrosion electric current density is 0.415A/cm2。
Embodiment 5
Carry out carbon steel work-piece surface treatment according to the method for embodiment 1 is only with diameter unlike the first embodiment
The bullet of 2mm carries out the ultrasonic shot peening processing of 90min, forms black film on carbon steel work-piece surface.
The corrosion potential of the black film prepared according to the method test embodiment of the present invention 5 of embodiment 3 is -0.705V,
Corrosion current density is 0.41A/cm2。
Embodiment 6
Carrying out carbon steel work-piece surface treatment according to the method for embodiment 1 is first unlike the first embodiment 2mm with diameter
Bullet carry out 30min ultrasonic shot peening processing, then be 4mm with diameter bullet carries out 60min ultrasonic shot peening handle；In carbon
Steel workpiece surface forms black film.
The corrosion potential of the black film prepared according to the method test embodiment of the present invention 6 of embodiment 3 is -0.711V,
Corrosion current density is 0.407A/cm2。
Embodiment 7
Carbon steel work-piece having a size of 15 × 10 × 4mm is first carried out at the ultrasonic shot peening of 15min with the bullet that diameter is 6mm
It manages, then the bullet for being 3.5mm with diameter carries out the ultrasonic shot peening processing of 40min；
Workpiece after bead is used into electrochemical deoiling agent oil removing 8min under the conditions of 80 DEG C, electrochemical deoiling agent includes: hydrogen
Sodium oxide molybdena, sodium carbonate, sodium metasilicate and water, concentration of the sodium hydroxide in electrochemical deoiling agent are 17g/L, and sodium carbonate is in electrochemical deoiling
Concentration in agent is 8g/L, and concentration of the sodium metasilicate in electrochemical deoiling agent is 8g/L, rinses workpiece with clear water after oil removing；
Workpiece after oil removing is subjected to acid pickling and rust removing under normal temperature conditions, pickling solution includes sulfuric acid, hydrochloric acid, nitric acid and water,
Concentration of the sulfuric acid in pickling solution is 155ml/L, and concentration of the hydrochloric acid in pickling solution is 310ml/L, and nitric acid is in pickling solution
Concentration is 55ml/L, rinses workpiece with clear water after acid pickling and rust removing；
Workpiece after acid pickling and rust removing is subjected to blackening process 20min under the conditions of 145 DEG C, hair blackening liquid include: sodium hydroxide,
Sodium nitrite, sodium nitrate and water, concentration of the sodium hydroxide in hair blackening liquid are 660g/L, concentration of the sodium nitrite in hair blackening liquid
For 190g/L, concentration of the sodium nitrate in hair blackening liquid is 63g/L, and the workpiece after blackening process is rinsed with clear water, is dried in the air at room temperature
It is dry to form black film in workpiece surface.
The corrosion potential of the black film prepared according to the method test embodiment of the present invention 7 of embodiment 3 is -0.724V,
Corrosion current density is 0.436A/cm2。
Embodiment 8
Carbon steel work-piece having a size of 15 × 10 × 4mm is first carried out at the ultrasonic shot peening of 25min with the bullet that diameter is 5mm
It manages, then the bullet for being 4mm with diameter carries out the ultrasonic shot peening processing of 50min；
Workpiece after bead is used into electrochemical deoiling agent oil removing 10min under the conditions of 75 DEG C, electrochemical deoiling agent includes: hydrogen
Sodium oxide molybdena, sodium carbonate, sodium metasilicate and water, concentration of the sodium hydroxide in electrochemical deoiling agent are 16g/L, and sodium carbonate is in electrochemical deoiling
Concentration in agent is 10g/L, and concentration of the sodium metasilicate in electrochemical deoiling agent is 10g/L, rinses workpiece with clear water after oil removing；
Workpiece after oil removing is subjected to acid pickling and rust removing under normal temperature conditions, pickling solution includes sulfuric acid, hydrochloric acid, nitric acid and water,
Concentration of the sulfuric acid in pickling solution is 145ml/L, and concentration of the hydrochloric acid in pickling solution is 305ml/L, and nitric acid is in pickling solution
Concentration is 60ml/L, rinses workpiece with clear water after acid pickling and rust removing；
Workpiece after acid pickling and rust removing is subjected to blackening process 40min under the conditions of 130 DEG C, hair blackening liquid include: sodium hydroxide,
Sodium nitrite, sodium nitrate and water, concentration of the sodium hydroxide in hair blackening liquid are 640g/L, concentration of the sodium nitrite in hair blackening liquid
For 210g/L, concentration of the sodium nitrate in hair blackening liquid is 57g/L, and the workpiece after blackening process is rinsed with clear water, is dried in the air at room temperature
It is dry to form black film in workpiece surface.
The corrosion potential of the black film prepared according to the method test embodiment of the present invention 8 of embodiment 3 is -0.709V,
Corrosion current density is 0.424A/cm2。
As seen from the above embodiment, the present invention provides a kind of carbon steel surface treatment methods, comprising: carbon steel is carried out surface
Bead；Blackening process is carried out to the carbon steel surface after bead.Compared with prior art, carbon steel table provided by the invention
Shot blasting on surface and blackening process are effectively combined by surface treatment method, can by first carrying out bead to carbon steel surface
The crystalline particle for the black film for forming subsequent blackening process is tiny, uniform, fine and close；And it can also make to send out by bead
The corrosion potential of black film improves, corrosion current density reduces；It can also make the resistance of black film by bead simultaneously
Increase, salt water resistance immersion ability are stronger.Therefore, the present invention can be improved preparation by carrying out bead before blackening process
The corrosion resistance of obtained black film.
Claims (6)
1. a kind of carbon steel surface treatment method, comprising:
Carbon steel is subjected to shot blasting on surface processing；
Blackening process is carried out to the carbon steel surface after bead；
The method of the bead are as follows:
The bullet of 4~6mm diameter is first used to carry out the shot-peening of 15~30min on carbon steel surface；
Then the shot-peening of 40~60min is carried out using the bullet of 2~3.5mm diameter again；
The temperature of the blackening process is 130~150 DEG C；
The time of the blackening process is 20~40min；
The hair blackening liquid that the blackening process uses includes:
Sodium hydroxide, sodium nitrite, sodium nitrate and water；
Concentration of the sodium hydroxide in hair blackening liquid is 595~705g/L；
Concentration of the sodium nitrite in hair blackening liquid is 175~225g/L；
Concentration of the sodium nitrate in hair blackening liquid is 45~75g/L.
2. carbon steel surface treatment method according to claim 1, which is characterized in that after the completion of the bead, black
Before processing carries out, further includes:
The product obtained after bead is successively subjected to oil removal treatment and pickling processes.
3. carbon steel surface treatment method according to claim 2, which is characterized in that the degreaser that the oil removal treatment uses
Include:
Sodium hydroxide, sodium carbonate, sodium metasilicate and water.
4. carbon steel surface treatment method according to claim 3, which is characterized in that the sodium hydroxide is in degreaser
Concentration is 13~17g/L；
Concentration of the sodium carbonate in degreaser is 8~12g/L；
Concentration of the sodium metasilicate in degreaser is 8~12g/L.
5. carbon steel surface treatment method according to claim 2, which is characterized in that the pickling solution that the pickling processes use
Include:
Sulfuric acid, hydrochloric acid, nitric acid and water.
6. carbon steel surface treatment method according to claim 5, which is characterized in that concentration of the sulfuric acid in pickling solution
For 145~155mL/L；
Concentration of the hydrochloric acid in pickling solution is 300~310mL/L；
Concentration of the nitric acid in pickling solution is 50~60mL/L.
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| CN108165071A (en) * | 2018-01-22 | 2018-06-15 | 吴嘉馨 | A kind of colloidal sol melanism metal conditioner |
| CN109909891B (en) * | 2019-03-26 | 2021-06-01 | 北京科技大学 | Surface treatment and test method for improving corrosion resistance of inner wall of SA106B mild steel pipe |
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