CN111394772A - Hammer surface electrophoresis treatment method - Google Patents
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- CN111394772A CN111394772A CN202010306538.0A CN202010306538A CN111394772A CN 111394772 A CN111394772 A CN 111394772A CN 202010306538 A CN202010306538 A CN 202010306538A CN 111394772 A CN111394772 A CN 111394772A
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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
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/32—Alkaline compositions
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/025—Cleaning or pickling metallic material with solutions or molten salts with acid solutions acidic pickling pastes
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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
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
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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
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/20—Pretreatment
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Abstract
The invention discloses a hammer surface electrophoresis treatment method which comprises the steps of hammer surface pretreatment, electrophoresis film forming and curing treatment. Micropores are corroded on the surface of the hammer, so that the bonding strength between the electrophoresis film and the surface of the hammer is greatly improved, the electrophoresis film is not easy to fall off, and the antirust and anticorrosive capabilities are ensured; through acidification treatment, an oxide layer is removed, the binding force between the electrophoresis film and the surface of the hammer is enhanced, and the adhesion of the electrophoresis film is further improved; the electrophoretic film is cured by adopting a hot air convection mode, the heating is uniform, the heating time is longer, the solvent volatilization speed is slow, the defects of orange peel and the like are not easy to appear on the surface layer of the electrophoretic film, and the film layer is flat and has good quality.
Description
Technical Field
The invention relates to the technical field of hammer production, in particular to a hammer surface electrophoresis treatment method.
Background
The hammer is the most common hand tool, and the hammer head is the most important part of the hammer, and the processing technology generally comprises the steps of forging a blank, machining by gold, heat treatment, tempering, shot blasting/polishing, soft rust prevention, laser, electrophoresis and the like. The purpose of electrophoresis is to form a layer of protective film on the surface of the hammer head, and to enhance the antirust capacity, the wear resistance and the corrosion resistance of the hammer head. However, the current electrophoretic coating technology mainly adopts a common electrophoretic treatment method to form a protective film on the surface of the hammer. The protective film and the surface of the hammer head have general binding force, and when the acting force between the hammer head and a knocked object is large, the impact force on the protective film is also large, so that the protective film is easy to fall off, and further the protective capability of the hammer head is lost. Therefore, the technical problem to be solved by the invention is how to design a hammer surface electrophoresis treatment method with strong surface bonding force of an electrophoresis film and a hammer.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a hammer surface electrophoresis treatment method with strong surface bonding force of an electrophoresis film and a hammer.
The invention solves the technical problems through the following technical means:
the hammer surface electrophoresis treatment method comprises the following steps:
a. the hammer surface pretreatment comprises degreasing and cleaning, surface pore forming and activation;
b. electrophoresis film forming;
c. curing treatment;
preferably, in the hammer surface electrophoresis treatment method, in the step a, the pore size of the pore formed on the surface is 10nm-10 um.
Preferably, in the step a, the specific method for removing oil and cleaning comprises the following steps: and ultrasonically cleaning the surface of the hammer by adopting ethanol for 30-50 min.
Preferably, in the step a, the concrete method for forming the holes on the surface is as follows: i, spraying aluminum powder on the surface of the hammer by adopting a plasma spraying normal method; II, putting the hammer with the surface sprayed with the aluminum powder into an alkaline solution with the pH of 10-12, and soaking for 1-2h at the temperature of 50-60 ℃; III, cleaning.
Preferably, in the electrophoresis treatment method for the surface of the hammer, in the step a, the specific method for activating is to perform acid washing treatment on the surface of the hammer by using a sulfuric acid solution with the concentration of 4-10 mol/L.
Preferably, in the step b, a cathode electrophoresis device is used for electrophoresis film formation, the electrophoresis voltage is 10-25V, the current is 0.2-0.6A, and the electrophoresis time is 10-80 min.
Preferably, the hammer surface electrophoresis treatment method comprises the following steps: heating, namely heating the hammer to 150-250 ℃ within 5-10 min; performing heat preservation treatment, and preserving heat for 10-18 min; taking out and cooling.
Preferably, the hammer surface electrophoresis treatment method is that the temperature rise treatment is carried out in a drying chamber, and the temperature rise mode adopts a fan to introduce high-temperature air into the drying chamber and circulate in the drying chamber, so that the hammer is heated in a convection manner.
Preferably, in the electrophoresis treatment method for the surface of the hammer, natural cooling or air cooling is adopted for cooling treatment.
The method has the advantages that ① micropores are corroded on the surface of the hammer, bonding strength of the electrophoresis film and the surface of the hammer is greatly improved, the electrophoresis film is not prone to falling off, antirust and anticorrosion capabilities are guaranteed, ② further corrodes the surface of the hammer through acidizing, oxide layers are removed, roughness of the surface of the hammer is improved, bonding force of the electrophoresis film and the surface of the hammer is enhanced, adhesive force of the electrophoresis film is further improved, ③ solidification treatment is conducted on the electrophoresis film in a hot air convection mode, heating is uniform, heating time is long, solvent volatilization speed is low, the defects of orange peels and the like do not easily occur on the surface layer of the electrophoresis film, and the film layer is flat and good in quality.
Drawings
FIG. 1 is an SEM image of a hammer of the present invention before erosion of the hammer surface.
FIG. 2 is an SEM image of a hammer of the present invention after forming a hole in the surface of the hammer.
FIG. 3 is an SEM image of the surface of a hammer of the present invention after activation (pickling).
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiment 1, a hammer surface electrophoresis treatment method, includes the following steps:
a, pretreatment:
(1) degreasing and cleaning, namely ultrasonically cleaning the surface of the hammer by adopting ethanol for 30min, and air-drying;
the cleaning aims at removing oil stains, dust and the like on the surface of the hammer, on one hand, aluminum powder can be better eroded into the surface layer of the hammer when aluminum powder is sprayed subsequently, if cleaning treatment is not carried out, due to the blocking of the oil stains and the dust, the aluminum powder is difficult to erode into the surface layer of the hammer, and the subsequent surface pore-forming effect is greatly reduced; on the other hand, the phenomenon that the binding force between the electrophoresis film and the surface of the hammer is reduced due to the existence of oil stains, dust and the like is avoided, and the adhesion strength of the electrophoresis film is ensured;
(2) the surface pore-forming method specifically comprises the following steps: i, spraying aluminum powder on the surface of the hammer by adopting a plasma spraying normal method; II, putting the hammer with the surface sprayed with the aluminum powder into an alkaline solution with the pH of 10, and soaking for 2 hours at the temperature of 50 ℃; III, cleaning; the alkaline solution adopts sodium carbonate solution; the pore size of the surface pore-forming is 10nm-10 um;
after the two-step treatment of spraying aluminum powder and soaking in alkaline solution, micropores with the pore size of 10nm-10um are formed on the surface of the hammer, and during subsequent electrophoretic film formation, the inside of a film layer can extend into the micropores, so that the binding force between the electrophoretic film and the surface of the hammer is greatly improved, and the falling off is prevented;
if the surface pore-forming treatment is not carried out, the acid cleaning-electrophoresis film forming-curing treatment is directly carried out, and during the electrophoresis film forming, the electrophoresis film is only attached to the outer surface of the hammer, and compared with the method that the electrophoresis film is stretched into the micropores to be combined with the hammer, the combination area is smaller and the combination force is naturally insufficient; on the other hand, the electrophoresis film is only attached to the outer surface of the hammer, and compared with the root system type combination formed by the electrophoresis film penetrating into the surface layer of the hammer, the combination strength is obviously greatly insufficient and the electrophoresis film is easy to fall off;
the plasma spraying method is a thermal spraying technology, after aluminum powder is sprayed on the surface of the hammer by adopting plasma spraying, part of aluminum powder particles can invade the inside of the surface layer of the hammer; when the hammer is soaked in a strong alkaline sodium carbonate solution, the aluminum powder reacts with the sodium carbonate solution, is removed from the surface of the hammer and flows down the corroded micropores; the reaction principle is as follows:
hydrolyzing sodium carbonate, reacting with aluminum to generate hydrogen and AlO2-
CO3 2-+H2O＝＝HCO3 -+OH-
AlO2-+HCO3-＝Al(OH)3↓+CO3 2-
(3) Activating, namely performing acid washing treatment on the surface of the hammer by adopting a sulfuric acid solution with the concentration of 4 mol/L;
acid washing treatment is carried out on the surface of the hammer by adopting a sulfuric acid solution, the sulfuric acid solution further erodes the surface of the hammer and the inner wall of the micropore, on one hand, an oxide layer on the surface of the hammer is damaged, a new bonding surface is formed on the surface of the hammer, and the bonding force of an electrophoresis film and the bonding surface of the hammer is strengthened; on the other hand, the sulfuric acid solution can further erode the inner wall of the micropore, so that the micropore is enlarged, the bonding area of the surface of the electrophoresis membrane and the surface of the hammer is increased, and the bonding force is increased;
(4) performing electrophoresis film formation, namely performing electrophoresis film formation by adopting cathode electrophoresis equipment, wherein the voltage of electrophoresis is 10V, the current is 0.2A, and the electrophoresis time is 70 min;
the electrophoretic permeability of the cathode electrophoretic film is higher than that of the anode electrophoretic film, and is usually 1.3-1.5 times of that of the anode electrophoretic film, and after the cathode electrophoretic film is formed by adopting cathode electrophoretic equipment, the electrophoretic film can better permeate into micropores on the surface of the hammer, so that the micropore combination effect is achieved;
(5) and (3) curing, namely, conveying the hammer into a drying chamber, introducing high-temperature air into the drying chamber by using a fan, circulating in the drying chamber, heating the hammer to 150 ℃ in a convection manner within 5min, keeping the temperature for 18min, and taking out and naturally cooling.
The electrophoretic film is cured by adopting a hot air convection mode, the heating is uniform, the heating time is longer, the solvent volatilization speed is slow, the defects of orange peel and the like are not easy to appear on the surface layer of the electrophoretic film, and the film layer is flat and has good quality.
The prepared sample has the following properties: the surface is uniform and flat, and the defects of orange peel and the like are avoided; the marking edge is smooth, the film layer does not fall off at the marking edge and the cross point, and the bonding strength is good; and in a neutral salt spray test, the salt spray resistance time is more than 1000h, and the corrosion resistance is excellent.
Embodiment 2, a hammer surface electrophoresis treatment method, including the following steps:
a, pretreatment:
(1) degreasing and cleaning, namely ultrasonically cleaning the surface of the hammer by adopting ethanol for 40min, and air-drying;
the cleaning aims at removing oil stains, dust and the like on the surface of the hammer, on one hand, aluminum powder can be better eroded into the surface layer of the hammer when aluminum powder is sprayed subsequently, if cleaning treatment is not carried out, due to the blocking of the oil stains and the dust, the aluminum powder is difficult to erode into the surface layer of the hammer, and the subsequent surface pore-forming effect is greatly reduced; on the other hand, the phenomenon that the binding force between the electrophoresis film and the surface of the hammer is reduced due to the existence of oil stains, dust and the like is avoided, and the adhesion strength of the electrophoresis film is ensured;
(2) the surface pore-forming method specifically comprises the following steps: i, spraying aluminum powder on the surface of the hammer by adopting a plasma spraying normal method; II, putting the hammer with the surface sprayed with the aluminum powder into an alkaline solution with the pH of 11, and soaking for 1.5h at the temperature of 55 ℃; III, cleaning; the alkaline solution adopts potassium hydroxide; the pore size of the surface pore-forming is 10nm-10 um;
after the two-step treatment of spraying aluminum powder and soaking in alkaline solution, micropores with the pore size of 10nm-10um are formed on the surface of the hammer, and during subsequent electrophoretic film formation, the inside of a film layer can extend into the micropores, so that the binding force between the electrophoretic film and the surface of the hammer is greatly improved, and the falling off is prevented;
if the surface pore-forming treatment is not carried out, the acid cleaning-electrophoresis film forming-curing treatment is directly carried out, and during the electrophoresis film forming, the electrophoresis film is only attached to the outer surface of the hammer, and compared with the method that the electrophoresis film is stretched into the micropores to be combined with the hammer, the combination area is smaller and the combination force is naturally insufficient; on the other hand, the electrophoresis film is only attached to the outer surface of the hammer, and compared with the root system type combination formed by the electrophoresis film penetrating into the surface layer of the hammer, the combination strength is obviously greatly insufficient and the electrophoresis film is easy to fall off;
the plasma spraying method is a thermal spraying technology, after aluminum powder is sprayed on the surface of the hammer by adopting plasma spraying, part of aluminum powder particles can invade the inside of the surface layer of the hammer; when the hammer is soaked in strong alkaline potassium hydroxide solution, aluminum powder reacts with sodium carbonate solution, is removed from the surface of the hammer and flows down the eroded micropores; the reaction principle is as follows:
2Al+6H2O＝2Al(OH)3+3H2；
Al(OH)3+KOH＝KAlO2+2H2O；
Al+2KOH+2H2O＝2KAlO2+3H2；
(3) activating, namely performing acid washing treatment on the surface of the hammer by adopting a sulfuric acid solution with the concentration of 7 mol/L;
acid washing treatment is carried out on the surface of the hammer by adopting a sulfuric acid solution, the sulfuric acid solution further erodes the surface of the hammer and the inner wall of the micropore, on one hand, an oxide layer on the surface of the hammer is damaged, a new bonding surface is formed on the surface of the hammer, and the bonding force of an electrophoresis film and the bonding surface of the hammer is strengthened; on the other hand, the sulfuric acid solution can further erode the inner wall of the micropore, so that the micropore is enlarged, the bonding area of the surface of the electrophoresis membrane and the surface of the hammer is increased, and the bonding force is increased;
(4) performing electrophoresis film formation, namely performing electrophoresis film formation by adopting cathode electrophoresis equipment, wherein the voltage of electrophoresis is 18V, the current is 0.4A, and the electrophoresis time is 50 min;
the electrophoretic permeability of the cathode electrophoretic film is higher than that of the anode electrophoretic film, and is usually 1.3-1.5 times of that of the anode electrophoretic film, and after the cathode electrophoretic film is formed by adopting cathode electrophoretic equipment, the electrophoretic film can better permeate into micropores on the surface of the hammer, so that the micropore combination effect is achieved;
(5) and (3) curing, namely, conveying the hammer into a drying chamber, introducing high-temperature air into the drying chamber by using a fan, circulating in the drying chamber, heating the hammer in a convection manner, raising the temperature of the hammer to 200 ℃ within 7min, preserving the temperature for 14min, and taking out and naturally cooling.
The electrophoretic film is cured by adopting a hot air convection mode, the heating is uniform, the heating time is longer, the solvent volatilization speed is slow, the defects of orange peel and the like are not easy to appear on the surface layer of the electrophoretic film, and the film layer is flat and has good quality.
The prepared sample has the following properties: the surface is uniform and flat, and the defects of orange peel and the like are avoided; the marking edge is smooth, the film layer does not fall off at the marking edge and the cross point, and the bonding strength is good; and in a neutral salt spray test, the salt spray resistance time is more than 1000h, and the corrosion resistance is excellent.
Embodiment 3, a hammer surface electrophoresis treatment method, including the following steps:
a, pretreatment:
(1) ultrasonically cleaning the surface of the hammer by adopting ethanol for 50min, and air-drying;
the cleaning aims at removing oil stains, dust and the like on the surface of the hammer, on one hand, aluminum powder can be better eroded into the surface layer of the hammer when aluminum powder is sprayed subsequently, if cleaning treatment is not carried out, due to the blocking of the oil stains and the dust, the aluminum powder is difficult to erode into the surface layer of the hammer, and the subsequent surface pore-forming effect is greatly reduced; on the other hand, the phenomenon that the binding force between the electrophoresis film and the surface of the hammer is reduced due to the existence of oil stains, dust and the like is avoided, and the adhesion strength of the electrophoresis film is ensured;
(2) the surface pore-forming method specifically comprises the following steps: i, spraying aluminum powder on the surface of the hammer by adopting a plasma spraying normal method; II, putting the hammer with the surface sprayed with the aluminum powder into an alkaline solution with the pH of 12, and soaking for 1h at the temperature of 60 ℃; III, cleaning; the alkaline solution adopts sodium bicarbonate; the pore size of the surface pore-forming is 10nm-10 um;
after the two-step treatment of spraying aluminum powder and soaking in alkaline solution, micropores with the pore size of 10nm-10um are formed on the surface of the hammer, and during subsequent electrophoretic film formation, the inside of a film layer can extend into the micropores, so that the binding force between the electrophoretic film and the surface of the hammer is greatly improved, and the falling off is prevented;
if the surface pore-forming treatment is not carried out, the acid cleaning-electrophoresis film forming-curing treatment is directly carried out, and during the electrophoresis film forming, the electrophoresis film is only attached to the outer surface of the hammer, and compared with the method that the electrophoresis film is stretched into the micropores to be combined with the hammer, the combination area is smaller and the combination force is naturally insufficient; on the other hand, the electrophoresis film is only attached to the outer surface of the hammer, and compared with the root system type combination formed by the electrophoresis film penetrating into the surface layer of the hammer, the combination strength is obviously greatly insufficient and the electrophoresis film is easy to fall off;
the plasma spraying method is a thermal spraying technology, after aluminum powder is sprayed on the surface of the hammer by adopting plasma spraying, part of aluminum powder particles can invade the inside of the surface layer of the hammer; when the hammer is soaked in strong alkaline sodium hydroxide solution, aluminum powder reacts with sodium carbonate solution, is removed from the surface of the hammer and flows down the eroded micropores; the reaction principle is as follows:
2Al+6H2O＝2Al(OH)3+3H2；
Al(OH)3+NaOH＝NaAlO2+2H2O；
Al+2NaOH+2H2O＝2NaAlO2+3H2；
(3) activating, namely performing acid washing treatment on the surface of the hammer by adopting a sulfuric acid solution with the concentration of 10 mol/L;
acid washing treatment is carried out on the surface of the hammer by adopting a sulfuric acid solution, the sulfuric acid solution further erodes the surface of the hammer and the inner wall of the micropore, on one hand, an oxide layer on the surface of the hammer is damaged, a new bonding surface is formed on the surface of the hammer, and the bonding force of an electrophoresis film and the bonding surface of the hammer is strengthened; on the other hand, the sulfuric acid solution can further erode the inner wall of the micropore, so that the micropore is enlarged, the bonding area of the surface of the electrophoresis membrane and the surface of the hammer is increased, and the bonding force is increased;
(4) performing electrophoresis film formation, namely performing electrophoresis film formation by adopting cathode electrophoresis equipment, wherein the voltage of electrophoresis is 25V, the current is 0.6A, and the electrophoresis time is 15 min;
the electrophoretic permeability of the cathode electrophoretic film is higher than that of the anode electrophoretic film, and is usually 1.3-1.5 times of that of the anode electrophoretic film, and after the cathode electrophoretic film is formed by adopting cathode electrophoretic equipment, the electrophoretic film can better permeate into micropores on the surface of the hammer, so that the micropore combination effect is achieved;
(5) and (3) curing, namely, conveying the hammer into a drying chamber, introducing high-temperature air into the drying chamber by using a fan, circulating in the drying chamber, heating the hammer to 250 ℃ in a convection manner, keeping the temperature for 10min, and taking out and naturally cooling.
The electrophoretic film is cured by adopting a hot air convection mode, the heating is uniform, the heating time is longer, the solvent volatilization speed is slow, the defects of orange peel and the like are not easy to appear on the surface layer of the electrophoretic film, and the film layer is flat and has good quality.
The prepared sample has the following properties: the surface is uniform and flat, and the defects of orange peel and the like are avoided; the marking edge is smooth, the film layer does not fall off at the marking edge and the cross point, and the bonding strength is good; and in a neutral salt spray test, the salt spray resistance time is more than 1000h, and the corrosion resistance is excellent.
Spraying aluminum powder on the surface of the hammer by thermal spraying, wherein partial aluminum powder particles can erode into the surface of the hammer, and then the aluminum powder is removed by alkaline solution when the hammer is soaked in the alkaline solution;
after the aluminum powder is removed, micropores are formed on the surface of the hammer, and the pore size of the micropores is controlled to be 10nm-10 um; during electrophoresis, a film formed by electrophoresis can seep into the micropores, so that the adhesion strength of the electrophoresis film is greatly enhanced, and the electrophoresis film is prevented from falling off;
activating (acidifying) the surface of the hammer by using a sulfuric acid solution, so that the binding force between the electrophoresis membrane and the surface of the hammer and the inner wall of the micropore is improved, and the adhesion strength of the electrophoresis membrane is further improved;
the electrophoretic film is cured by adopting a hot air convection mode, the heating is uniform, the heating time is longer, the solvent volatilization speed is slow, the defects of orange peel and the like are not easy to appear on the surface layer of the electrophoretic film, and the film layer is flat and has good quality.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The hammer surface electrophoresis treatment method is characterized by comprising the following steps:
a. the hammer surface pretreatment comprises degreasing and cleaning, surface pore forming and activation;
b. electrophoresis film forming;
c. and (5) curing treatment.
2. The method of claim 1, wherein the step of performing electrophoresis on the surface of the hammer comprises: in the step a, the pore size of the surface pore-forming is 100nm-10 um.
3. The electrophoresis treatment method for the surface of the hammer as claimed in claim 1, wherein in the step a, the specific method for degreasing and cleaning comprises the following steps: and ultrasonically cleaning the surface of the hammer by adopting ethanol for 30-50 min.
4. The method for electrophoretic treatment of the surface of a hammer as claimed in claim 1, wherein in step a, the specific method for forming the holes on the surface is as follows: i, spraying aluminum powder on the surface of the hammer by adopting a plasma spraying normal method; II, putting the hammer with the surface sprayed with the aluminum powder into an alkaline solution with the pH of 10-12, and soaking for 1-2h at the temperature of 50-60 ℃; III, cleaning.
5. The method for electrophoretic treatment of surface of hammer as claimed in claim 1, wherein in step a, the activating step is carried out by pickling the surface of hammer with a sulfuric acid solution having a concentration of 4-10 mol/L.
6. The method of claim 1, wherein the step of performing electrophoresis on the surface of the hammer comprises: and in the step b, performing electrophoresis film formation by adopting cathode electrophoresis equipment, wherein the voltage of electrophoresis is 10-25V, the current is 0.2-0.6A, and the electrophoresis time is 10-80 min.
7. The electrophoresis processing method for the surface of the hammer as claimed in claim 1, wherein the curing process comprises: heating, namely heating the hammer to 150-250 ℃ within 5-10 min; performing heat preservation treatment, and preserving heat for 10-18 min; taking out and cooling.
8. The method of claim 7, wherein the step of performing electrophoresis on the surface of the hammer comprises: and carrying out temperature rise treatment in the drying chamber, wherein the temperature rise mode adopts a fan to introduce high-temperature air into the drying chamber and circulates in the drying chamber, so that the hammer is heated in a convection manner.
9. The method of claim 7, wherein the step of performing electrophoresis on the surface of the hammer comprises: the cooling treatment adopts natural cooling or air cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010306538.0A CN111394772A (en) | 2020-04-17 | 2020-04-17 | Hammer surface electrophoresis treatment method |
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| CN112813372A (en) * | 2020-12-31 | 2021-05-18 | 合肥亿昌兴智能科技有限公司 | Galvanized sheet with tightly adhered coating and production process thereof |
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