CN113308719B - Hard oxidation treatment method for automobile part calipers - Google Patents
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- CN113308719B CN113308719B CN202110575285.1A CN202110575285A CN113308719B CN 113308719 B CN113308719 B CN 113308719B CN 202110575285 A CN202110575285 A CN 202110575285A CN 113308719 B CN113308719 B CN 113308719B
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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
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
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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
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/10—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
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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
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/16—Pretreatment, e.g. desmutting
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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
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
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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
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/10—Agitating of electrolytes; Moving of racks
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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
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/12—Process control or regulation
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Abstract
The invention discloses a hard oxidation treatment method for calipers of automobile parts, which comprises the following steps: the automobile part clamp is placed on a machine tool to be subjected to surface polishing, the automobile part clamp is subjected to ultrasonic cleaning, the automobile part clamp is placed in a mixed acid solution to be subjected to acid etching, the automobile part clamp is electrified as an anode to be subjected to anodic oxidation after the acid etching, a workpiece after the anodic oxidation is subjected to steam hole sealing, the automobile part clamp is placed in an electrophoresis tank to be subjected to electrophoresis, the cleaned automobile part clamp is placed in a dryer to be subjected to workpiece surface blow-drying, and the workpiece is placed in an oven to be dried. The invention has the advantages that by controlling the oxidation temperature and the current density, the problems of loosening and pulverization of an oxide film caused by overhigh temperature during anodic oxidation are avoided, the thickness of the oxide film is uniform, and the corrosion resistance of the metal surface is improved.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a hard oxidation treatment method for calipers of automobile parts.
Background
When a caliper of an automobile part brakes an automobile, a brake pedal is stepped down to clamp a brake disc to generate friction force, and after the brake pedal is released, friction plates at two ends are squeezed outwards by the jump of the end face when the brake disc rotates to separate the friction plates from the brake disc so as to eliminate the friction force, but the friction plate cannot be completely returned by the return mode of the friction plates, so that the friction plates and the brake disc are dragged and abraded to a certain degree, therefore, the automobile does not brake during normal running, the friction plates and the brake disc have certain friction, and the friction plates and the brake disc can be abraded too fast and the service life is shortened due to long-term operation, meanwhile, the heat generated by friction can reduce the efficiency of a brake and prolong the braking distance, creating a hazard.
Since the calipers of automobile parts are easy to corrode after being exposed in air for a long time, a layer of oxidation film for preventing metal corrosion is usually formed on the metal surface of the calipers, the porosity of the metal oxidation film formed under natural conditions is large, and the corrosion resistance and the abrasion resistance of the metal surface can not meet the requirements of industrial application, so the performance of the oxidation film can be enhanced through metal surface treatment of anodic oxidation, wherein the anodic oxidation refers to that under the action of applied current, a layer of oxidation film is formed on the anode surface of a metal product, the metal is subjected to anodic oxidation surface treatment in corresponding electrolyte and under specific process conditions, the anodic oxidation of the metal is an electrolytic oxidation process, the surface of the metal can be converted into a layer of oxidation film in the process, the layer of oxidation film has protection and decoration, and the defects in the aspects of metal surface hardness, abrasion resistance and the like are overcome, the application range is enlarged, and the service life can be prolonged.
The metal oxide film changes the state and the performance of the metal surface, protects the metal surface from being damaged, a large number of micropores exist in the formed metal oxide film thin layer, and the micropores are adsorbed with a lubricant so as to improve the corrosion resistance and the wear resistance of the metal surface, but the metal surface which is subjected to anodic oxidation at present has the following problems that firstly, the thickness of the oxide film layer is relatively thin, the hardness and the wear resistance can not reach the standard, and in addition, the surface can generate powder or cracks due to the high temperature during anodic oxidation, so that the hardness of the oxide film surface is influenced; secondly, the appearance may be burnt due to overlarge current density during anodic oxidation, and meanwhile, the problem of partial dissolution of metal under the film can occur due to ineffective heat dissipation in the anodic oxidation process, so that the corrosion resistance and the wear resistance of the surface of the oxide film are influenced.
Disclosure of Invention
The invention aims to provide a hard oxidation treatment method for calipers of automobile parts, which solves the problems of looseness and pulverization of an oxide film caused by overhigh temperature during anodic oxidation, enables the thickness of the oxide film to be uniform, and avoids the influence on the anodic oxidation effect caused by uneven stirring of a solution during anodic oxidation, thereby integrally improving the corrosion resistance of the metal surface.
A hard oxidation treatment method for automobile part calipers comprises the following steps:
step 1, hanging and surface polishing: firstly, placing the automobile part calipers on a machine tool to carry out surface polishing, wherein the polishing process comprises coarse grinding and fine grinding, and hanging the polished automobile part calipers on a hanger to move;
step 2, surface pretreatment: firstly, ultrasonically cleaning automobile part calipers, then cleaning particles on the surfaces of the automobile part calipers by using absolute ethyl alcohol, then putting the automobile part calipers into a sodium phosphate solution to perform surface oil stain treatment, and cleaning the surfaces of workpieces by using hot pure water;
step 3, acid etching and cleaning: placing the automobile part calipers into a mixed acid solution for acid etching, and cleaning the surface of a workpiece by using clear water after the acid etching;
step 4, anodic oxidation treatment: placing the automobile part calipers serving as anodes in an acidic solution tank, electrifying to carry out anodic oxidation on the automobile part calipers and form an oxide film on the metal surface, controlling the oxidation temperature to be between 23 and 24 ℃, controlling the current density to be between 100 and 160 amperes per square meter, and immersing the automobile part calipers subjected to anodic oxidation in a hot water tank for scalding;
step 5, sealing holes with steam: placing automobile part calipers into a hole sealing device, using pure water as hole sealing liquid, then heating the pure water to a water vapor state of 120 ℃ under high temperature and high pressure, carrying out hole sealing treatment on an oxide film layer of a workpiece, taking the workpiece out of the hole sealing device after hole sealing is finished, and placing the workpiece into a clean water tank for cleaning;
step 6, electrophoresis: placing the washed automobile part calipers into an electrophoresis tank for electrophoresis, and then placing the electrophoresis workpieces into a clear water tank for washing;
and 7, drying: and (3) placing the cleaned automobile part calipers at a dryer for drying the surface of the workpiece, and drying the workpiece in an oven after drying.
The oxidation temperature is controlled between 23 ℃ and 24 ℃, so that the problem of slow oxidation speed caused by low temperature during anodic oxidation is avoided, and the problems of loose and powdered oxide film caused by high temperature during anodic oxidation are avoided; the current density is controlled to be 100-160 amperes per square meter, so that the phenomenon that the oxide film is not uniform in thickness and the chemical performance of the metal surface is influenced due to the fact that the oxide film is pulverized and the film thickness is reduced due to overlarge current density is prevented; automobile parts calliper carries out the vapour hole sealing under 120 ℃ steam environment, carries out hydration reaction through high temperature vapor and aluminium oxide, thereby the metal surface can expand and block the micropore in the oxidation film thin layer, has that the hole sealing is fast and can not appear the problem of lime to whole corrosion resisting property who improves the metal surface.
Further, the concentration of the sodium phosphate solution is 30 to 60 grams per liter, the automobile part calipers are completely soaked in the sodium phosphate solution, the time for soaking the automobile part calipers in the sodium phosphate solution is 5 to 6 minutes, and the temperature is controlled to be between 52 ℃ and 55 ℃. The sodium phosphate solution removes oil stains on the surface of the aluminum alloy part, so that the hydrophilicity of the surface of the aluminum alloy part is improved.
Further, the temperature during coarse grinding is controlled between 22 ℃ and 35 ℃, and the coarse grinding time is controlled between 3 minutes and 15 minutes; during fine grinding, the temperature is controlled between 20 ℃ and 32 ℃, and the time is controlled between 6 minutes and 12 minutes. The surface of the aluminum alloy part is polished for two times to achieve the effect of brightness and smoothness.
Further, the acid etching time is controlled to be 1-2 minutes, the acid etching temperature is 19-28 ℃, the automobile part calipers are completely immersed in water for cleaning after the acid etching, and then the automobile part calipers are moved to a spraying pool through a hanger for washing.
Furthermore, the acid-etched mixed acid solution contains additives, the additives comprise corrosion inhibitors and accelerators, the accelerators are chlorides, and the corrosion inhibitors are chromates and molybdates.
The corrosion inhibitor has the function of forming a protective film on the anode by covering the metal ion generating oxide film in the anode area of the metal surface, thereby inhibiting the metal surface from dissolving into water and achieving the purpose of corrosion inhibition by inhibiting the anode process of corrosion reaction.
Further, the acid solution during anodic oxidation is sulfuric acid and/or oxalic acid, a cathode and an anode are communicated in the acid solution and are positioned at two ends of the acid solution tank, and a stirring sheet is arranged in the acid solution tank.
The cathode and the anode are positioned at two ends of the acidic solution tank, so that the phenomenon that the anode and the cathode are too close to each other to cause overheating to influence the temperature of anodic oxidation is avoided; the stirring sheet is arranged in the acidic solution tank, so that the problem that the temperature of the solution is uneven to influence the anodic oxidation effect due to uneven stirring during anodic oxidation, and further the corrosion resistance of the metal surface is influenced, is avoided.
Further, when the hole sealing treatment is carried out on the oxide film layer, the time for sealing the hole by the steam is determined according to the thickness of the oxide film on the surface of the workpiece, and the hole sealing time is controlled to be between 5 and 15 minutes. The steam sealing has the advantages of high sealing speed, good sealing quality and no lime generation after sealing.
Further, the automobile part calipers are soaked in pure water for 2 to 5 minutes after being soaked in a hot water tank for scalding after anodic oxidation, and the pH value of the pure water is between 7.2 and 7.6. After being scalded and washed, the automobile part calipers are soaked in pure water, so that the film layer is more uniform and complete, and the micropores of the film layer are not easy to have pulverization.
Further, after hole sealing is completed, the automobile part calipers are completely immersed into the water tank, and the automobile part calipers are subjected to washing and spray-washing from top to bottom and washing and spray-washing from bottom to top through secondary lifting of the hanger. The angles of the two times of spraying are different, so that the metal surface can be ensured to have no residues.
Further, the oven is filled with nitrogen, the automobile parts and calipers are placed into the oven to be dried for 20 to 40 minutes, and the temperature of the oven is between 85 and 125 ℃.
The invention has the advantages that: by controlling the oxidation temperature and the current density, the problems of loosening and pulverization of an oxidation film caused by overhigh temperature during anodic oxidation are avoided, the thickness of the oxidation film is uniform, and the corrosion resistance of the metal surface is improved; the automobile parts are subjected to steam hole sealing under the water vapor environment of 120 ℃, so that the hole sealing speed is high, and the problem of lime cannot occur, thereby integrally improving the corrosion resistance of the metal surface; the stirring sheet is arranged in the acidic solution tank, so that the problem that the temperature of the solution is uneven to influence the anodic oxidation effect due to uneven stirring during anodic oxidation, and further the corrosion resistance of the metal surface is influenced, is avoided.
Drawings
FIG. 1 is a flow chart of a hard oxidation treatment method for calipers of automobile parts.
Detailed Description
Aiming at the defects in the prior art, the invention provides a hard oxidation treatment method for calipers of automobile parts, which solves the problems of loosening and pulverization of an oxidation film caused by overhigh temperature during anodic oxidation, enables the thickness of the oxidation film to be uniform, avoids the influence on the anodic oxidation effect caused by uneven stirring of a solution during anodic oxidation, and integrally improves the corrosion resistance of the metal surface.
In order to solve the technical problems, the invention adopts the following technical scheme:
as one embodiment, as shown in fig. 1, a hard oxidation treatment method for a caliper of an automobile part includes the steps of:
step 1, hanging and surface polishing: firstly, placing the automobile part calipers on a machine tool to carry out surface polishing, wherein the polishing process comprises coarse grinding and fine grinding, and hanging the polished automobile part calipers on a hanger to move;
step 2, surface pretreatment: firstly, ultrasonically cleaning automobile part calipers, then cleaning particles on the surfaces of the automobile part calipers by using absolute ethyl alcohol, then putting the automobile part calipers into a sodium phosphate solution to perform surface oil stain treatment, and cleaning the surfaces of workpieces by using hot pure water;
step 3, acid etching and cleaning: placing the automobile part calipers into a mixed acid solution for acid etching, and cleaning the surface of a workpiece by using clear water after the acid etching;
step 4, anodic oxidation treatment: placing the automobile part calipers serving as anodes in an acidic solution tank, electrifying to carry out anodic oxidation on the automobile part calipers and form an oxide film on the metal surface, controlling the oxidation temperature to be between 23 and 24 ℃, controlling the current density to be between 100 and 160 amperes per square meter, and immersing the automobile part calipers subjected to anodic oxidation in a hot water tank for scalding;
step 5, sealing holes with steam: placing automobile part calipers into a hole sealing device, using pure water as hole sealing liquid, then heating the pure water to a water vapor state of 120 ℃ under high temperature and high pressure, carrying out hole sealing treatment on an oxide film layer of a workpiece, taking the workpiece out of the hole sealing device after hole sealing is finished, and placing the workpiece into a clean water tank for cleaning;
step 6, electrophoresis: placing the washed automobile part calipers into an electrophoresis tank for electrophoresis, and then placing the electrophoresis workpieces into a clear water tank for washing;
and 7, drying: and (3) placing the cleaned automobile part calipers at a dryer for drying the surface of the workpiece, and drying the workpiece in an oven after drying.
Preferably, the oxidation temperature is controlled between 23 ℃ and 24 ℃, so that the problem of slow oxidation speed caused by low temperature during anodic oxidation is avoided, and the problem of loose and powdered oxide film caused by high temperature during anodic oxidation is also avoided; the current density is controlled to be 100-160 amperes per square meter, so that the phenomenon that the oxide film is not uniform in thickness and the chemical performance of the metal surface is influenced due to the fact that the oxide film is pulverized and the film thickness is reduced due to overlarge current density is prevented; automobile parts calliper carries out the vapour hole sealing under 120 ℃ steam environment, carries out hydration reaction through high temperature vapor and aluminium oxide, thereby the metal surface can expand and block the micropore in the oxidation film thin layer, has that the hole sealing is fast and can not appear the problem of lime to whole corrosion resisting property who improves the metal surface.
Preferably, the concentration of the sodium phosphate solution is 30 to 60 grams per liter, the automobile part caliper is completely soaked in the sodium phosphate solution, the time of soaking the automobile part caliper in the sodium phosphate solution is 5 to 6 minutes, and the temperature is controlled to be between 52 ℃ and 55 ℃. The sodium phosphate solution removes oil stains on the surface of the aluminum alloy part, so that the hydrophilicity of the surface of the aluminum alloy part is improved.
Preferably, the temperature during coarse grinding is controlled between 22 ℃ and 35 ℃, and the coarse grinding time is controlled between 3 and 15 minutes; during fine grinding, the temperature is controlled between 20 ℃ and 32 ℃, and the time is controlled between 6 minutes and 12 minutes. The surface of the aluminum alloy part is polished for two times to achieve the effect of brightness and smoothness.
Preferably, the acid etching time is controlled to be 1-2 minutes, the acid etching temperature is 19-28 ℃, the automobile part calipers are completely immersed in water for cleaning after the acid etching, and then the automobile part calipers are moved to a spraying tank through a hanger for washing.
In one embodiment, the acid-etched mixed acid solution contains additives, the additives comprise corrosion inhibitors and accelerators, the accelerators are chlorides, and the corrosion inhibitors are chromates and molybdates.
Preferably, the corrosion inhibitor has the function of forming a protective film on the anode by covering the metal ion generation oxide film in the anode area of the metal surface, so that the metal surface is inhibited from dissolving into water, and the corrosion inhibition purpose is achieved by inhibiting the anode process of corrosion reaction.
In one embodiment, the acidic solution used in the anodic oxidation is sulfuric acid and/or oxalic acid, the acidic solution has a cathode and an anode in communication therewith, the cathode and the anode are located at both ends of an acidic solution tank, and the acidic solution tank has a stirring blade incorporated therein.
Preferably, the cathode and the anode are positioned at two ends of the acidic solution tank, so that the phenomenon that the anode and the cathode are too close to each other to cause overheating to influence the temperature of anodic oxidation is avoided; the stirring sheet is arranged in the acidic solution tank, so that the problem that the temperature of the solution is uneven to influence the anodic oxidation effect due to uneven stirring during anodic oxidation, and further the corrosion resistance of the metal surface is influenced, is avoided.
In one embodiment, when the oxide film layer is sealed, the time for sealing the steam is determined according to the thickness of the oxide film on the surface of the workpiece, and the sealing time is controlled to be between 5 and 15 minutes. The steam sealing has the advantages of high sealing speed, good sealing quality and no lime generation after sealing.
Preferably, the automobile part caliper is immersed in a hot water tank after being anodized and then immersed in pure water for 2 to 5 minutes, wherein the pH value of the pure water is between 7.2 and 7.6. After being scalded and washed, the automobile part calipers are soaked in pure water, so that the film layer is more uniform and complete, and the micropores of the film layer are not easy to have pulverization.
As an implementation mode, after hole sealing is completed, the automobile part calipers are completely immersed into the water tank, and the automobile part calipers are subjected to one-time washing and spray washing from top to bottom and one-time washing and spray washing from bottom to top through secondary lifting of the hanger. The angles of the two times of spraying are different, so that the metal surface can be ensured to have no residues.
Preferably, the oven is filled with nitrogen, the automobile part calipers are placed into the oven to be dried for 20 to 40 minutes, and the temperature of the oven is between 85 and 125 ℃.
The invention has the beneficial effects that: by controlling the oxidation temperature and the current density, the problems of loosening and pulverization of the oxide film caused by overhigh temperature during anodic oxidation are avoided, the thickness of the oxide film is uniform, and the corrosion resistance of the metal surface is improved. The automobile part calipers are subjected to steam hole sealing in a 120 ℃ steam environment by adopting steam hole sealing, so that the problem of high hole sealing speed and no lime is caused, and the corrosion resistance of the metal surface is integrally improved. The stirring sheet is arranged in the acidic solution tank, so that the problem that the temperature of the solution is uneven to influence the anodic oxidation effect due to uneven stirring during anodic oxidation, and further the corrosion resistance of the metal surface is influenced, is avoided.
All patents and publications mentioned in the specification of the invention are indicative of the techniques disclosed in the art to which this invention pertains and are intended to be applicable. All patents and publications cited herein are hereby incorporated by reference to the same extent as if each individual publication was specifically and individually indicated to be incorporated by reference. The invention described herein may be practiced in the absence of any element or elements, limitation or limitations, which limitation or limitations is not specifically disclosed herein. For example, in each of the examples herein the terms "comprising", "consisting essentially of", and "consisting of" may be substituted for the remaining 2 terms of either. The terms and expressions which have been employed herein are used as terms of description and not of limitation, and there is no intention in the use of such terms and expressions of excluding any equivalents of the features shown and described, but it is recognized that various modifications and changes may be made within the scope of the invention and the claims which follow. It is to be understood that the embodiments described herein are preferred embodiments and features and that modifications and variations may be made by one skilled in the art in light of the teachings of this disclosure, and are to be considered within the purview and scope of this invention and the scope of the appended claims and their equivalents.
Claims (10)
1. The hard oxidation treatment method of the automobile part calipers is characterized by comprising the following steps:
step 1, hanging and surface polishing: firstly, placing the automobile part calipers on a machine tool to carry out surface polishing, wherein the polishing process comprises coarse grinding and fine grinding, and hanging the polished automobile part calipers on a hanger to move;
step 2, surface pretreatment: firstly, ultrasonically cleaning automobile part calipers, then cleaning particles on the surfaces of the automobile part calipers by using absolute ethyl alcohol, then putting the automobile part calipers into a sodium phosphate solution to perform surface oil stain treatment, and cleaning the surfaces of workpieces by using hot pure water;
step 3, acid etching and cleaning: placing the automobile part calipers into a mixed acid solution for acid etching, and cleaning the surface of a workpiece by using clear water after the acid etching;
step 4, anodic oxidation treatment: placing the automobile part calipers serving as anodes in an acidic solution tank, electrifying to carry out anodic oxidation on the automobile part calipers and form an oxide film on the metal surface, controlling the oxidation temperature to be between 23 and 24 ℃, controlling the current density to be between 100 and 160 amperes per square meter, and immersing the automobile part calipers subjected to anodic oxidation in a hot water tank for scalding;
step 5, sealing holes with steam: placing automobile part calipers into a hole sealing device, using pure water as hole sealing liquid, then heating the pure water to a water vapor state of 120 ℃ under high temperature and high pressure, carrying out hole sealing treatment on an oxide film layer of a workpiece, taking the workpiece out of the hole sealing device after hole sealing is finished, and placing the workpiece into a clean water tank for cleaning;
step 6, electrophoresis: placing the washed automobile part calipers into an electrophoresis tank for electrophoresis, and then placing the electrophoresis workpieces into a clear water tank for washing;
and 7, drying: and (3) placing the cleaned automobile part calipers at a dryer for drying the surface of the workpiece, and drying the workpiece in an oven after drying.
2. The hard oxidation treatment method for the automobile part caliper according to claim 1, characterized in that: the concentration of the sodium phosphate solution is 30-60 grams per liter, the automobile part calipers are completely soaked in the sodium phosphate solution, the time for soaking the automobile part calipers in the sodium phosphate solution is 5-6 minutes, and the temperature is controlled to be 52-55 ℃.
3. The hard oxidation treatment method for the automobile part caliper according to claim 1, characterized in that: the temperature during the coarse grinding is controlled between 22 ℃ and 35 ℃, and the coarse grinding time is controlled between 3 minutes and 15 minutes; during fine grinding, the temperature is controlled between 20 ℃ and 32 ℃, and the time is controlled between 6 minutes and 12 minutes.
4. The hard oxidation treatment method for the automobile part caliper according to claim 1, characterized in that: the time of the acid etching is controlled to be 1-2 minutes, the temperature of the acid etching is 19-28 ℃, the automobile part calipers are completely immersed in water for cleaning after the acid etching, and then the automobile part calipers are moved to a spraying tank through a hanger for washing.
5. The hard oxidation treatment method for the automobile part caliper according to claim 1, characterized in that: the mixed acid solution for acid etching contains an additive, wherein the additive consists of a corrosion inhibitor and an accelerator, the accelerator is chloride, and the corrosion inhibitor is chromate and molybdate.
6. The hard oxidation treatment method for the automobile part caliper according to claim 1, characterized in that: the acid solution during anodic oxidation is sulfuric acid and/or oxalic acid, a cathode and an anode are communicated in the acid solution and are positioned at two ends of an acid solution tank, and a stirring sheet is arranged in the acid solution tank.
7. The hard oxidation treatment method for the automobile part caliper according to claim 1, characterized in that: when the hole sealing treatment is carried out on the oxide film layer of the workpiece, the time for sealing the holes by the steam is determined according to the thickness of the oxide film on the surface of the workpiece, and the hole sealing time is controlled to be between 5 and 15 minutes.
8. The hard oxidation treatment method for the automobile part caliper according to claim 1, characterized in that: the automobile part calipers are immersed in a hot water tank after being anodized, are then immersed in pure water for 2 to 5 minutes after being scalded, and the pH value of the pure water is between 7.2 and 7.6.
9. The hard oxidation treatment method for the automobile part caliper according to claim 1, characterized in that: and after hole sealing is finished, the workpiece is taken out of the hole sealing device and is put into a clean water tank for cleaning, and the automobile part calipers are subjected to one-time washing and spray-washing from top to bottom and one-time washing and spray-washing from bottom to top through secondary lifting of the hanger.
10. The hard oxidation treatment method for the automobile part caliper according to claim 1, characterized in that: the oven is filled with nitrogen, the automobile parts and calipers are placed into the oven to be dried for 20 to 40 minutes, and the temperature of the oven is between 85 and 125 ℃.
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| CN111235617A (en) * | 2020-01-17 | 2020-06-05 | 浙江龙纪汽车零部件股份有限公司 | Anodic oxidation process for automobile aluminum material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111235617A (en) * | 2020-01-17 | 2020-06-05 | 浙江龙纪汽车零部件股份有限公司 | Anodic oxidation process for automobile aluminum material |
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