CN110629269A - Surface treatment process for aluminum alloy part of turning machine - Google Patents

Surface treatment process for aluminum alloy part of turning machine Download PDF

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Publication number
CN110629269A
CN110629269A CN201910884046.7A CN201910884046A CN110629269A CN 110629269 A CN110629269 A CN 110629269A CN 201910884046 A CN201910884046 A CN 201910884046A CN 110629269 A CN110629269 A CN 110629269A
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aluminum alloy
surface treatment
deionized water
treatment process
turning machine
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周逸
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Chiyi Automation Technology Suzhou Co Ltd
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Chiyi Automation Technology Suzhou Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • 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
    • 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
    • C25D11/12—Anodising more than once, e.g. in different baths
    • 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
    • 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
    • C25D11/24—Chemical after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/20—Metallic substrate based on light metals
    • B05D2202/25—Metallic substrate based on light metals based on Al

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • General Chemical & Material Sciences (AREA)
  • ing And Chemical Polishing (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

A surface treatment process for an aluminum alloy part of a turning machine comprises the following steps: the method comprises the steps of pretreatment of aluminum alloy, anodic oxidation treatment, preparation of a molecular sieve membrane synthetic solution and preparation of an aluminum alloy anodic oxide membrane-molecular sieve membrane. The molecular sieve membrane synthetic liquid is a mixed liquid of tetrapropylammonium hydroxide, tetraethoxysilane and deionized water, and the molar ratio of the mixed liquid of the tetrapropylammonium hydroxide, the tetraethoxysilane and the deionized water is 0.35:1: 170. The surface treatment process for the aluminum alloy part of the turning machine, disclosed by the invention, is simple in process, combines the anodic oxide film with the molecular sieve film, has better bonding force with the aluminum alloy surface, combines the advantages of two surface treatment technologies, is environment-friendly, economic and effective, improves the hardness and the corrosion resistance of the aluminum alloy part surface, and has a wide application prospect.

Description

Surface treatment process for aluminum alloy part of turning machine
Technical Field
The invention belongs to the technical field of aluminum alloy surface treatment processes, and particularly relates to a surface treatment process for an aluminum alloy part of a turning machine.
Background
Turning machines, machines for turning, also referred to as lathing, are part of the machining. Lathe machining mainly uses a lathe tool to perform turning machining on a rotating workpiece. The lathe can also be used for corresponding processing by using a drill bit, a reamer, a screw tap, a die, a knurling tool and the like. Lathes are used primarily for machining shafts, discs, sleeves and other workpieces having a surface of revolution, and are the most widely used type of machine tool in machine manufacturing and repair plants.
Aluminum alloy means that a certain amount of other elements such as Si, Mg, Mn, Ti, Ni and the like are added into pure aluminum. According to the difference of added alloy elements, the alloy can be divided into seven types of super hard aluminum (LC), hard aluminum (LY), forged aluminum (LD), antirust aluminum (LF), cladding aluminum (LB), special aluminum (LT), brazing aluminum (LQ) and the like. The aluminum alloy not only keeps the advantages of small density of pure aluminum and the like, but also has a plurality of unique properties. The aluminum alloy has higher strength, good plasticity, and less limitation on the shape and size of the part in the processing process. The aluminum alloy also has higher electric conductivity, heat conductivity and excellent corrosion resistance, so the aluminum alloy is widely applied to the aspects of transportation, power, chemical industry, medicine, machinery and the like. The parts of the turning machine are usually made of aluminum alloy, and the structural weight of the turning machine can be reduced by more than 50%.
Like other metals, aluminum alloys also face serious corrosion problems. Therefore, it is necessary to further perform a surface treatment process on the aluminum alloy. In order to overcome the defects of the surface of the aluminum alloy in corrosion resistance, wear resistance and the like and improve the corrosion resistance, a corrosion-resistant and pollution-resistant surface layer needs to be formed on the aluminum alloy. Currently, research into surface treatment techniques for aluminum alloys is actively being conducted. It is known from the corrosion mechanism of aluminum alloys that the occurrence of corrosion can only be effectively controlled by isolating the metal surface from the corrosive medium, mainly by surface treatments including anodization, electroplating, coating, chemical conversion coating, etc.
Chinese patent application No. CN201811171600.9 discloses an aluminum alloy surface treatment process, which adopts pretreatment degreasing and alkaline etching, anodic oxidation, activation, dyeing, hole sealing, morphology treatment, and film coating, and has complex steps, thus being not beneficial to industrial production and popularization.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide the surface treatment process for the aluminum alloy part of the turning machine, which is simple in process, combines the anodic oxide film and the molecular sieve film, has better bonding force with the surface of the aluminum alloy, combines the advantages of two surface treatment technologies, is environment-friendly, economical and effective, improves the hardness and the corrosion resistance of the surface of the aluminum alloy part, and has wide application prospect.
The purpose of the invention is realized by the following technical scheme:
a surface treatment process for an aluminum alloy part of a turning machine, characterized by comprising the steps of:
(1) pretreatment of the aluminum alloy: cleaning the surface of the aluminum alloy by using alcohol; polishing the surface of the aluminum alloy step by step, removing scratches on the surface to make the surface bright, and cleaning with deionized water; etching the aluminum alloy; after etching treatment, washing and drying by using deionized water, and then ultrasonically washing by using ethanol;
(2) anodic oxidation treatment: carrying out anodic oxidation treatment on the pretreated aluminum alloy;
(3) preparing a molecular sieve membrane synthetic solution: the molecular sieve membrane synthetic liquid is a mixed liquid of tetrapropylammonium hydroxide, tetraethoxysilane and deionized water, and the molar ratio of the mixed liquid of the tetrapropylammonium hydroxide, the tetraethoxysilane and the deionized water is 0.35:1: 170;
(4) preparing an aluminum alloy anodic oxide film-molecular sieve film: cleaning the aluminum alloy subjected to anodic oxidation treatment by using deionized water, hanging the aluminum alloy in a reaction kettle by using a copper wire, pouring the prepared molecular sieve membrane synthetic solution to 4/5 of the reaction kettle, tightly covering the reaction kettle, screwing a stainless steel outer sleeve, reacting at 180 ℃ for 8-10 h, cleaning the aluminum alloy by using deionized water after the reaction is finished, and drying at 60 ℃.
The surface treatment process for the aluminum alloy part of the turning machine combines the anodic oxide film and the molecular sieve film, and better improves the corrosion resistance of the aluminum alloy. The molecular sieve membrane can realize the molecular sieving function as a novel membrane material, has the advantages of chemical corrosion resistance, biological corrosion resistance and the like, is an ideal membrane anticorrosive material, and is environment-friendly. Anodic oxidation refers to a process of forming a layer of dense and thick oxide film on an anode under the action of an external current. The electrochemical process has simple process, easy application and good reproducibility, can control the surface appearance and roughness, and has large structure area. The anodic oxide film has the advantages of corrosion resistance, wear resistance and the like. The anodic oxide film and the molecular sieve film are combined, so that the bonding force with the surface of the aluminum alloy is better, the advantages of two surface treatment technologies are combined, the environment is friendly, the economy and the effectiveness are realized, and the hardness and the corrosion resistance of the surface of the aluminum alloy part are improved.
Further, in the surface treatment process for an aluminum alloy part of a turning machine, the etching treatment in the step (1) comprises the following steps: putting the aluminum alloy into NaOH solution, soaking and corroding for 38s at the constant temperature of 60 ℃, immediately taking out, and repeatedly washing with deionized water; the mass fraction of the NaOH solution is 5%.
In order to improve the deposition effect of the molecular sieve on the surface of the aluminum alloy, etching treatment is carried out on the aluminum alloy.
Further, in the surface treatment process for an aluminum alloy part of a turning machine, the step (2) further includes the following steps: and (3) adding tetrapropylammonium hydroxide into deionized water according to the molar ratio, adding tetraethoxysilane while stirring, continuing to add the tetrapropylammonium hydroxide after stirring and clarifying when turbidity occurs, and aging for 4 hours after the tetraethoxysilane is completely added.
In the preparation process of the molecular sieve membrane synthetic liquid, ethyl orthosilicate is added while stirring, because the molecular sieve membrane synthetic liquid is in a sol state, the material distribution of the synthetic liquid is more uniform, and a uniform molecular sieve membrane is easier to obtain in a crystallization process than in a gel state.
Further, the surface treatment process for the aluminum alloy part of the turning machine, which is described above, includes the following steps in the anodizing treatment in the step (2):
(1) electrochemical polishing: suspending the pretreated aluminum alloy by using an aluminum wire to make the aluminum alloy immovable, and tightly winding and sealing the folded part of the lead by using an insulating adhesive tape; clamping the sealed aluminum alloy, putting the aluminum alloy into a mixed solution of phosphoric acid and glycerol, and placing two lead plates connected by a copper wire in the parallel direction; connecting an aluminum alloy with a positive electrode, connecting a lead plate with a negative electrode, adjusting constant current, polishing for 80-90s, taking out the aluminum alloy, and repeatedly cleaning and drying with deionized water;
(2) primary anodic oxidation: putting the electrochemically polished aluminum alloy into an oxalic acid solution, connecting a circuit in the same way as in the step (1), adjusting constant current, oxidizing for 1h in a constant-temperature water bath, taking out a sample, repeatedly washing and drying;
(3) demoulding: putting the aluminum alloy obtained in the step (2) into a mixed solution of phosphoric acid and chromic acid, corroding for 15min, and removing a primary oxide film; after finishing, putting the mixture into an ultrasonic cleaner for cleaning;
(4) secondary anodic oxidation: connecting the stripped aluminum alloy with a circuit in the same manner as in the step (1), and putting the aluminum alloy into oxalic acid solution again for secondary anodic oxidation treatment in the same step (2).
Further, in the surface treatment process for the aluminum alloy part of the turning machine, the volume ratio of the mixed solution of phosphoric acid and glycerol is 9:1, and the temperature of the mixed solution of phosphoric acid and glycerol is 40-50 ℃.
Further, in the surface treatment process for the aluminum alloy part of the turning machine, the constant current of the steps (2) and (4) has a current density of 10A/dm 2.
Further, in the surface treatment process for the aluminum alloy part of the turning machine, the oxalic acid solution in the steps (2) and (4) is 0.3 mol/L.
Further, in the surface treatment process for an aluminum alloy part of a turning machine, the volume ratio of the mixed solution of phosphoric acid and chromic acid in the step (3) is 1: 1.
Further, in the surface treatment process for the aluminum alloy part of the turning machine, the temperature of the constant-temperature water bath in the steps (2) and (4) is 15-25 ℃.
Compared with the prior art, the invention has the following beneficial effects:
the surface treatment process for the aluminum alloy part of the turning machine, disclosed by the invention, has the advantages of reasonable step arrangement and simple process, combines the anodic oxide film with the molecular sieve film, wherein the anodic oxidation electrochemical process has the advantages of simple process, easiness in application, good reproducibility, capability of controlling surface appearance and roughness and large structure area, the anodic oxide film has corrosion resistance and wear resistance, the molecular sieve film can realize a molecular sieving function, and the surface treatment process has the advantages of chemical corrosion resistance, biological corrosion resistance and the like, is good in corrosion resistance and is environment-friendly. The anodic oxide film and the molecular sieve film are combined, so that the bonding force with the surface of the aluminum alloy is better, the advantages of two surface treatment technologies are combined, the method is environment-friendly, economic and effective, the hardness and the corrosion resistance of the surface of the aluminum alloy part are improved, and the application prospect is wide.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to specific experimental data, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Examples
(1) Pretreatment of the aluminum alloy: cleaning the surface of the aluminum alloy by using alcohol; polishing the surface of the aluminum alloy step by step, removing scratches on the surface to make the surface bright, and cleaning with deionized water; etching the aluminum alloy, putting the aluminum alloy into NaOH solution, etching for 38s at the constant temperature of 60 ℃, immediately taking out, and repeatedly washing with deionized water; the mass fraction of the NaOH solution is 5%; after etching treatment, washing and drying by using deionized water, and then ultrasonically washing by using ethanol;
(2) anodic oxidation treatment: carrying out anodic oxidation treatment on the pretreated aluminum alloy, wherein the anodic oxidation treatment comprises the following steps:
1) suspending the pretreated aluminum alloy by using an aluminum wire to make the aluminum alloy immovable, and tightly winding and sealing the folded part of the lead by using an insulating adhesive tape; clamping the sealed aluminum alloy, putting the aluminum alloy into a mixed solution of phosphoric acid and glycerol, wherein the volume ratio of the mixed solution of phosphoric acid and glycerol is 9:1, the temperature of the mixed solution of phosphoric acid and glycerol is 40-50 ℃, and placing two lead plates connected by a copper wire in the parallel direction; connecting an aluminum alloy with a positive electrode, connecting a lead plate with a negative electrode, adjusting constant current, polishing for 80-90s, taking out the aluminum alloy, and repeatedly cleaning and drying with deionized water;
2) putting the electrochemically polished aluminum alloy into 0.3mol/L oxalic acid solution, connecting a circuit in the same way as in the step (1), adjusting constant current, oxidizing for 1h in a constant-temperature water bath at 15-25 ℃, taking out a sample, repeatedly washing and drying;
3) putting the aluminum alloy obtained in the step (2) into a mixed solution of phosphoric acid and chromic acid, wherein the volume ratio of the mixed solution of phosphoric acid and chromic acid is 1:1, corroding for 15min, and removing a primary oxide film; after finishing, putting the mixture into an ultrasonic cleaner for cleaning;
4) connecting the stripped aluminum alloy with a circuit in the same manner as in the step (1), and putting the aluminum alloy into 0.3mol/L oxalic acid solution again for secondary anodic oxidation treatment, which is the same as the step (2);
(3) preparing a molecular sieve membrane synthetic solution: the molecular sieve membrane synthetic liquid is a mixed liquid of tetrapropylammonium hydroxide, tetraethoxysilane and deionized water, and the molar ratio of the mixed liquid of the tetrapropylammonium hydroxide, the tetraethoxysilane and the deionized water is 0.35:1: 170; adding tetrapropylammonium hydroxide into deionized water according to the molar ratio, adding tetraethoxysilane while stirring, continuing to add the tetrapropylammonium hydroxide after stirring and clarifying when turbidity occurs, and aging for 4 hours after the tetraethoxysilane is completely added;
(4) preparing an aluminum alloy anodic oxide film-molecular sieve film: cleaning the aluminum alloy subjected to anodic oxidation treatment by using deionized water, hanging the aluminum alloy in a reaction kettle by using a copper wire, pouring the prepared molecular sieve membrane synthetic solution to 4/5 of the reaction kettle, tightly covering the reaction kettle, screwing a stainless steel outer sleeve, reacting at 180 ℃ for 8-10 h, cleaning the aluminum alloy by using deionized water after the reaction is finished, and drying at 60 ℃.
Effect verification:
the aluminum alloys for aluminum alloy parts for lathes (examples) obtained in the above examples and untreated aluminum alloys (blanks) were subjected to property tests in accordance with the following criteria, and the test results are shown in Table 1.
(1) Salt spray corrosion test: a LYW-015 type salt spray corrosion test chamber is adopted. Wherein, 5 wt% NaCl solution is used, the pH value is 6.5-7.2, the experimental temperature is 35 ℃, the saturated tank temperature is 47 ℃, a continuous spraying mode is adopted, the spraying pressure is 0.15Mpa, and the continuous spraying time is 8 h. The salt spray test is carried out according to GB/T10125-1997 artificial atmosphere corrosion test-salt spray test.
(2) And (3) testing the binding force, namely qualitatively representing the binding degree of the film/coating and the substrate interface by adopting an ultrasonic method and through a change curve of the mass loss of the film/coating along with the ultrasonic time.
TABLE 1
The invention has many applications, and the above description is only a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.

Claims (9)

1. A surface treatment process for an aluminum alloy part of a turning machine, characterized by comprising the steps of:
(1) pretreatment of the aluminum alloy: cleaning the surface of the aluminum alloy by using alcohol; polishing the surface of the aluminum alloy step by step, removing scratches on the surface to make the surface bright, and cleaning with deionized water; etching the aluminum alloy; after etching treatment, washing and drying by using deionized water, and then ultrasonically washing by using ethanol;
(2) anodic oxidation treatment: carrying out anodic oxidation treatment on the pretreated aluminum alloy;
(3) preparing a molecular sieve membrane synthetic solution: the molecular sieve membrane synthetic liquid is a mixed liquid of tetrapropylammonium hydroxide, tetraethoxysilane and deionized water, and the molar ratio of the mixed liquid of tetrapropylammonium hydroxide, tetraethoxysilane and deionized water is 0.35:1: 170;
(4) preparing an aluminum alloy anodic oxide film-molecular sieve film: cleaning the aluminum alloy subjected to anodic oxidation treatment by using deionized water, hanging the aluminum alloy in a reaction kettle by using a copper wire, pouring the prepared molecular sieve membrane synthetic solution to 4/5 of the reaction kettle, tightly covering the reaction kettle, screwing a stainless steel outer sleeve, reacting at 180 ℃ for 8-10 h, cleaning the aluminum alloy by using deionized water after the reaction is finished, and drying at 60 ℃.
2. The surface treatment process for an aluminum alloy part for a turning machine according to claim 1, wherein the etching treatment in the step (1) comprises the steps of: putting the aluminum alloy into NaOH solution, soaking and corroding for 38s at the constant temperature of 60 ℃, immediately taking out, and repeatedly washing with deionized water; the mass fraction of the NaOH solution is 5%.
3. The surface treatment process for an aluminum alloy component of a turning machine according to claim 1, wherein the step (2) further comprises the steps of: and (3) adding tetrapropylammonium hydroxide into deionized water according to the molar ratio, adding tetraethoxysilane while stirring, continuing to add the tetrapropylammonium hydroxide after stirring and clarifying when turbidity occurs, and aging for 4 hours after the tetraethoxysilane is completely added.
4. The surface treatment process for an aluminum alloy component of a turning machine according to claim 1, wherein the anodizing treatment in the step (2) includes the steps of:
(1) electrochemical polishing: suspending the pretreated aluminum alloy by using an aluminum wire to make the aluminum alloy immovable, and tightly winding and sealing the folded part of the lead by using an insulating adhesive tape; clamping the sealed aluminum alloy, putting the aluminum alloy into a mixed solution of phosphoric acid and glycerol, and placing two lead plates connected by a copper wire in the parallel direction; connecting an aluminum alloy with a positive electrode, connecting a lead plate with a negative electrode, adjusting constant current, polishing for 80-90s, taking out the aluminum alloy, and repeatedly cleaning and drying with deionized water;
(2) primary anodic oxidation: putting the electrochemically polished aluminum alloy into an oxalic acid solution, connecting a circuit in the same way as in the step (1), adjusting constant current, oxidizing for 1h in a constant-temperature water bath, taking out a sample, repeatedly washing and drying;
(3) putting the aluminum alloy obtained in the step (2) into a mixed solution of phosphoric acid and chromic acid, corroding for 15min, and removing a primary oxide film; after finishing, putting the mixture into an ultrasonic cleaner for cleaning;
(4) secondary anodic oxidation: connecting the stripped aluminum alloy with a circuit in the same manner as in the step (1), and putting the aluminum alloy into oxalic acid solution again for secondary anodic oxidation treatment in the same step (2).
5. The surface treatment process for an aluminum alloy member for a turning machine according to claim 4, wherein the volume ratio of the mixed liquid of phosphoric acid and glycerin is 9:1, the temperature of the mixed solution of phosphoric acid and glycerol is 40-50 ℃.
6. Surface treatment process for aluminium alloy parts of turning machines according to claim 4, characterized in that the constant current of steps (2), (4) has a current density of 10A/dm 2.
7. The surface treatment process for an aluminum alloy part of a turning machine as recited in claim 4, wherein the oxalic acid solution of the steps (2) and (4) is 0.3 mol/L.
8. The surface treatment process for an aluminum alloy member for a turning machine according to claim 4, wherein the volume ratio of the mixed solution of phosphoric acid and chromic acid in the step (3) is 1: 1.
9. The surface treatment process for an aluminum alloy part of a turning machine according to claim 4, wherein the temperature of the constant-temperature water bath of the steps (2) and (4) is 15-25 ℃.
CN201910884046.7A 2019-09-19 2019-09-19 Surface treatment process for aluminum alloy part of turning machine Pending CN110629269A (en)

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Application publication date: 20191231