CN108774471B - Strengthening treatment process beneficial to improving comprehensive performance of damping bicycle accessories - Google Patents
Strengthening treatment process beneficial to improving comprehensive performance of damping bicycle accessories Download PDFInfo
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- CN108774471B CN108774471B CN201810506156.5A CN201810506156A CN108774471B CN 108774471 B CN108774471 B CN 108774471B CN 201810506156 A CN201810506156 A CN 201810506156A CN 108774471 B CN108774471 B CN 108774471B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/02—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
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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
- C25D11/18—After-treatment, e.g. pore-sealing
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- Chemical Kinetics & Catalysis (AREA)
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- Inorganic Chemistry (AREA)
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- Vibration Dampers (AREA)
Abstract
The invention belongs to the field of bicycle part processing, and particularly relates to a strengthening treatment process beneficial to improving the comprehensive performance of shock-absorbing bicycle accessories, which comprises the following steps: after the surface of the clean aluminum alloy section is polished and anodized, the section heat treatment is carried out, so that the hardness and compactness of the section and the surface oxide film of the section are effectively improved; and then the alkali liquor containing benzenesulfonyl hydrazide is used for treatment, so that the bonding fastness between the aluminum alloy section and the rubber is improved, and an effective guarantee is provided for subsequent drilling processing and use.
Description
Technical Field
The invention belongs to the field of bicycle part processing, and particularly relates to a strengthening treatment process beneficial to improving the comprehensive performance of shock-absorbing bicycle accessories.
Background
A main material for manufacturing shock-absorbing bicycle accessories in the prior art is aluminum alloy, the aluminum alloy has the advantage of light weight, the weight of a bicycle cannot be obviously increased, but the strength of the aluminum alloy also has a large lifting space. In the prior art, the strength of the aluminum alloy is improved mainly by adding novel and efficient alloy elements or some heat treatment strengthening processes, wherein the problem of overhigh cost is often faced by adding the alloy elements, and the compatibility between the elements is improved.
In addition, rubber is an ideal damping elastic material, so that the aluminum alloy section bar and the rubber can be compounded to be used as a damping bicycle accessory. However, the adhesion between the rubber and the aluminum alloy profile is not necessarily ideal, and particularly, based on the installation requirement, a threaded hole needs to be drilled on the composite profile on a machine tool in the subsequent process, so that the risk of falling of the rubber from the surface of the aluminum alloy profile is increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: when the aluminum alloy section is used as a damping bicycle accessory, the strength has a space for improving, and the adhesive force needs to be improved after the aluminum alloy section is compounded with damping material rubber,
in order to solve the technical problem, the invention provides a strengthening treatment process beneficial to improving the comprehensive performance of shock-absorbing bicycle accessories, which comprises the following specific steps:
(1) polishing the surface of the clean aluminum alloy section;
(2) carrying out anodic oxidation on the aluminum alloy section treated in the step (1),
immersing the aluminum alloy section treated in the step (1) into an acid electrolyte, oxidizing the aluminum alloy section as an anode under the action of external current,
the acid electrolyte is obtained by dissolving sulfuric acid in water according to the mass concentration of 8-15%, and the temperature of the acid electrolyte is 25-30 ℃; the current density of the external current is 1-1.5A/dm2Oxidizing for 20-30 min, and taking out the aluminum alloy section from the electrolyte and drying after the oxidation is finished;
(3) thermal treatment
Preheating the aluminum alloy section subjected to anodic oxidation in the step (2) at 200-230 ℃ for 1-2 h, then treating at 530-550 ℃ for 15-20 h, then carrying out heat preservation treatment at 120-135 ℃ for 5-8 h, and finally cooling,
in the concrete operation, the aluminum alloy section subjected to anodic oxidation in the step (2) is placed in an aging heat treatment furnace, the furnace temperature of the aging heat treatment furnace is increased to 200-230 ℃ at the speed of 5-10 ℃/min and is kept for 1-2 h, the furnace temperature is increased to 530-550 ℃ at the speed of 15-20 ℃/min and is kept for 15-20 h, the furnace door is opened, the furnace door is closed when the furnace temperature naturally decreases to 120-135 ℃, heat preservation treatment is carried out for 5-8 h, finally the aluminum alloy section is taken out of the furnace, is cooled to the normal temperature (25 ℃) by low-temperature water at the temperature of 5 ℃,
the aluminum alloy section is preheated for a period of time before being subjected to high-temperature treatment, so that the growth of crystal grains in the high-temperature heat preservation process is favorably inhibited, the subsequent high-temperature treatment is favorable for the homogenization of the crystal grains, the compactness of the aluminum alloy section is increased, the heat preservation treatment is favorable for improving the volume fraction of a final strengthening phase, and the water cooling rate is higher than that of natural cooling, so that the strength of the section is favorably improved;
(4) surface preparation
The treatment fluid comprises the following components in parts by weight,
the alkali is sodium hydroxide or potassium hydroxide,
adding benzenesulfonyl hydrazide, alkali and surfactant into deionized water, uniformly mixing to obtain a treatment solution,
the benzene sulfonyl hydrazide is not dissolved in most solvents, but can be well dissolved in an inorganic base environment,
soaking the aluminum alloy section treated in the step (3) in a treatment solution for 30-60 minutes, controlling the temperature of the treatment solution to be 60-70 ℃, taking out and drying at a low temperature;
(5) rubber coating
a. Mixing of rubber materials
Plasticating rubber by using an open mill, adding an auxiliary agent containing a vulcanizing agent and a plasticizer into the rubber for mixing,
the auxiliary agent can also comprise an anti-aging agent, a promoter, an active agent and the like,
the rubber is ethylene propylene diene monomer, the auxiliary agent adopts the common auxiliary agent in the field,
when the rubber is independently plasticated, the pressure is set to be 5-8 MPa, the temperature is 75-80 ℃, the rotating speed is 50-55 rpm, and the plastication time is 2-4 minutes; after the addition of the auxiliary agent, setting the rotating speed to 35-40 rpm, raising the temperature to 95-100 ℃, mixing for 2-5 minutes under the condition of 5-8 MPa of pressure, and fully exhausting;
b. glue spreading
Dispersing the rubber material mixed in the step a into rubber cement in an organic solvent, uniformly coating the rubber cement on the surface of the aluminum alloy section pretreated in the step (4), drying, carrying out mould pressing vulcanization on the aluminum alloy section in a vulcanizing machine,
in the adhesive cement, the mass ratio of the adhesive material to the organic solvent is 1:4,
the vulcanization pressure is 4-8 MPa, the vulcanization temperature is 100-120 ℃, and the vulcanization time is 5-15 minutes.
The aluminum alloy is used as the basic section of the damping bicycle accessory, the damping bicycle accessory has the characteristic of light weight, a layer of oxide film is formed on the surface of the aluminum alloy section through anodic oxidation of the aluminum alloy section so as to achieve the purpose of surface protection, and the hardness and compactness of the aluminum alloy section and the oxide film on the surface of the aluminum alloy section are improved through a heat treatment link; on the basis, the alkaline treatment liquid containing benzenesulfonyl hydrazide is adopted to treat the surface of the section, so that the bonding fastness between the aluminum alloy and the rubber is greatly increased, and the effective guarantee is provided for subsequent drilling processing and use.
Detailed Description
Example 1
A surface strengthening treatment process for shock-absorbing bicycle accessories comprises the following steps:
(1) polishing the surface of a clean 6061 aluminum alloy section;
(2) immersing the aluminum alloy section treated in the step (1) into sulfuric acid aqueous solution with the mass concentration of 10 percent at the temperature of 30 ℃ (enough sulfuric acid aqueous solution), and oxidizing the aluminum alloy section as an anode under the action of external current, wherein the current density of the external current is 1.3A/dm2The oxidation time is 28min, the aluminum alloy section is taken out from the electrolyte after the oxidation is finished and is fully dried at the temperature of 40 ℃,
at this time, the surface of the aluminum alloy profile subjected to the anodic oxidation treatment was measured using an HXD-1000TC durometer to find hardness HV356.4,
meanwhile, the corrosion resistance time of the surface of the aluminum alloy profile subjected to the anodic oxidation treatment is measured to be 273 hours (salt spray consists of sodium chloride and glacial acetic acid, and the pH value is 2.5);
(3) thermal treatment
Placing the aluminum alloy section subjected to anodic oxidation in the step (2) in an aging heat treatment furnace, increasing the furnace temperature of the aging heat treatment furnace from room temperature (25 ℃) to 213 ℃ at the speed of 8 ℃/minute and keeping the temperature for 100 minutes, increasing the furnace temperature to 530 ℃ at the speed of 16 ℃/minute and keeping the temperature for 18 hours, opening a furnace door, closing the furnace door for heat preservation treatment for 6 hours when the furnace temperature naturally decreases to 130 ℃, finally taking the aluminum alloy section out of the furnace, cooling the aluminum alloy section to the room temperature (25 ℃) with low-temperature water at the temperature of 5 ℃,
the test operation in the same step (2) is adopted, the surface hardness of the aluminum alloy section reaches HV428.3, the corrosion resistance time reaches 346 hours,
therefore, the strength and the compactness of the aluminum alloy section and the surface oxide film thereof are obviously improved through the heat treatment;
(4) surface preparation
The treatment fluid comprises the following components in parts by weight,
adding the benzenesulfonyl hydrazide, the sodium hydroxide and the sodium dodecyl benzene sulfonate into deionized water, uniformly mixing to obtain a treatment solution,
immersing the aluminum alloy section processed in the step (3) in the processing liquid (enough processing liquid) for 45 minutes, controlling the temperature of the processing liquid to be 60 ℃, taking out and fully drying at 50 ℃;
(5) rubber coating
a. Mixing of rubber materials
Plasticating 100 parts by weight of ethylene propylene diene monomer (K4551A) by using an open mill under the conditions of pressure of 6MPa, temperature of 78-80 ℃ and rotation speed of 55rpm,
plasticating for 3 minutes, adding 15 weight parts of paraffin oil, 0.2 weight part of sulfur, 0.5 weight part of tetramethyl thiuram disulfide, 3.5 weight parts of dibutyl phthalate and 0.9 weight part of N-phenyl-beta-naphthylamine into the colloid, setting the rotating speed to 40rpm, raising the temperature to 97-98 ℃, mixing for 4 minutes under the condition of 6MPa of pressure, fully exhausting air to obtain a rubber compound,
b. glue spreading
Fully dispersing the rubber compound obtained in the step a into rubber cement in toluene, wherein the weight ratio of the rubber compound to the toluene is 1:4, uniformly coating the obtained rubber cement on the surface of the aluminum alloy section pretreated in the step (4), controlling the thickness of a coating layer to be 2.5mm, fully placing the aluminum alloy section at 70 ℃, transferring the aluminum alloy section with the coating to a vulcanizing machine, carrying out compression vulcanization heat treatment for 15 minutes at the vulcanization pressure of 7.5MPa and the vulcanization temperature of 100 ℃, naturally cooling,
and trimming the corner parts of the opposite sides to obtain the rubber-combined aluminum alloy section for the shock-absorbing bicycle accessories.
Through detection, the binding force between the die pressing vulcanized rubber coating and the aluminum alloy section is 3.7 MPa.
Comparative example 1
The surface pretreatment was not carried out, and the rest of the operation was the same as in example 1:
(1) surface polishing was the same as in example 1;
(2) anodizing as in example 1;
(3) the heat treatment was the same as in example 1;
(4) the rubber coating was the same as in example 1.
The detection proves that the bonding force between the die pressing vulcanized rubber coating and the aluminum alloy section is only 0.8 MPa.
This reflects the great contribution of the pretreatment measures of the present solution to the bonding between the rubber and the aluminum alloy substrate.
Comparative example 2
(1)
The surface pretreatment was not performed, and the subsequent rubber matrix was replaced with nitrile rubber, and the rest of the procedure was the same as in example 1:
(1) surface polishing was the same as in example 1;
(2) anodizing as in example 1;
(3) the heat treatment was the same as in example 1;
(4) rubber coating
a. Mixing of rubber materials
The same procedures as in example 1 were repeated except that 100 parts by weight of ethylene-propylene-diene monomer (K4551A) was replaced with an equal part by weight of nitrile butadiene rubber (NBR1704),
b. glue spreading
In the same manner as in the example 1,
and trimming the corner parts of the opposite sides to obtain the rubber-combined aluminum alloy section for the shock-absorbing bicycle accessories.
Through detection, the binding force between the die pressing vulcanized rubber coating and the aluminum alloy section is 0.9 MPa.
(2)
Only on the basis of comparative example 2(1) is added a "surface pre-treatment" operation:
(1) surface polishing was the same as in example 1;
(2) anodizing as in example 1;
(3) the heat treatment was the same as in example 1;
(4) surface pretreatment the same as in example 1;
(5) the rubber coating was performed as in comparative example 2(1),
and trimming the corner parts of the opposite sides to obtain the rubber-combined aluminum alloy section for the shock-absorbing bicycle accessories.
Through detection, the binding force between the die pressing vulcanized rubber coating and the aluminum alloy section is 0.9 MPa.
Comparative example 3
(1)
The surface pretreatment was not performed, and the subsequent rubber substrate was replaced with chloroprene rubber, and the rest of the operation was the same as in example 1:
(1) surface polishing was the same as in example 1;
(2) anodizing as in example 1;
(3) the heat treatment was the same as in example 1;
(4) rubber coating
a. Mixing of rubber materials
The same procedure as in example 1 was repeated except that 100 parts by weight of ethylene-propylene-diene monomer (K4551A) was replaced with an equal part by weight of chloroprene rubber (CR122),
b. glue spreading
In the same manner as in the example 1,
and trimming the corner parts of the opposite sides to obtain the rubber-combined aluminum alloy section for the shock-absorbing bicycle accessories.
Through detection, the binding force between the die pressing vulcanized rubber coating and the aluminum alloy section is 1.1 MPa.
(2)
Only on the basis of comparative example 3(1) is added a "surface pre-treatment" operation:
(1) surface polishing was the same as in example 1;
(2) anodizing as in example 1;
(3) the heat treatment was the same as in example 1;
(4) surface pretreatment the same as in example 1;
(5) the rubber coating was performed as in comparative example 3(1),
and trimming the corner parts of the opposite sides to obtain the rubber-combined aluminum alloy section for the shock-absorbing bicycle accessories.
Through detection, the binding force between the die pressing vulcanized rubber coating and the aluminum alloy section is 1.1 MPa.
Based on comparative examples 2 and 3, it can be seen that when the scheme utilizes pretreatment measures to improve the bonding force between rubber and aluminum alloy, the specific requirements on the types of attached rubber are also met.
Comparative example 4
The pretreatment solution contained no benzenesulfonyl hydrazide, and the other components and operations were the same as in example 1:
(1) surface polishing was the same as in example 1;
(2) anodizing as in example 1;
(3) the heat treatment was the same as in example 1;
(4) surface preparation
The treatment fluid comprises the following components in parts by weight,
9.5 portions of sodium hydroxide
2 parts of sodium dodecyl benzene sulfonate
83.6 parts of deionized water, namely,
adding the sodium hydroxide and the sodium dodecyl benzene sulfonate into deionized water, uniformly mixing to obtain a treatment solution,
immersing the aluminum alloy section processed in the step (2) in the processing liquid (enough processing liquid) for 45 minutes, controlling the temperature of the processing liquid to be 60 ℃, taking out and fully drying at 50 ℃;
(5) the rubber coating was the same as in example 1,
and trimming the corner parts of the opposite sides to obtain the rubber-combined aluminum alloy section for the shock-absorbing bicycle accessories.
Through detection, the binding force between the die pressing vulcanized rubber coating and the aluminum alloy section is 0.9 MPa.
Comparative example 5
Adding the benzenesulfonyl hydrazide in the pretreatment solution into the rubber compound according to the proportion of the usage amount of the benzenesulfonyl hydrazide attached to the surface of the section bar after drying, and performing the same operation on the rest components as in example 1:
(1) surface polishing was the same as in example 1;
(2) anodizing as in example 1;
(3) the heat treatment was the same as in example 1;
(4) surface pretreatment as in comparative example 4;
(5) rubber coating
a. Mixing of rubber materials
Plasticating 100 parts by weight of ethylene propylene diene monomer (K4551A) by using an open mill under the conditions of pressure of 6MPa, temperature of 78-80 ℃ and rotation speed of 55rpm,
plasticating for 3 minutes, adding 0.076 weight part of benzenesulfonyl hydrazide, 15 weight parts of paraffin oil, 0.2 weight part of sulfur, 0.5 weight part of tetramethyl thiuram disulfide, 3.5 weight parts of dibutyl phthalate and 0.9 weight part of N-phenyl-beta-naphthylamine into the colloid, setting the rotating speed to 40rpm, raising the temperature to 97-98 ℃, mixing for 4 minutes under the condition of 6MPa of pressure, fully exhausting air to obtain a rubber compound,
b. glue spreading
In the same manner as in the example 1,
and trimming the corner parts of the opposite sides to obtain the rubber-combined aluminum alloy section for the shock-absorbing bicycle accessories.
Through detection, the binding force between the die pressing vulcanized rubber coating and the aluminum alloy section is 0.9 MPa.
Claims (6)
1. The utility model provides a be favorable to promoting the intensive processing technology of shock attenuation bicycle accessory comprehensive properties which characterized in that: the steps of the process are as follows,
(1) polishing the surface of the clean aluminum alloy section;
(2) carrying out anodic oxidation on the aluminum alloy section treated in the step (1),
immersing the aluminum alloy section treated in the step (1) into an acid electrolyte, and oxidizing the aluminum alloy section as an anode under the action of external current;
(3) thermal treatment
Preheating the aluminum alloy section subjected to anodic oxidation in the step (2) at 200-230 ℃ for 1-2 h, then carrying out high-temperature treatment at 530-550 ℃ for 15-20 h, then carrying out heat preservation treatment at 120-135 ℃ for 5-8 h, and finally cooling;
(4) surface preparation
The treatment fluid comprises the following components in parts by weight,
soaking the aluminum alloy section treated in the step (3) in a treatment solution, taking out and drying at low temperature;
(5) rubber coating
And (4) coating rubber on the surface of the aluminum alloy section pretreated in the step (4) in a mucilage form, drying and carrying out die pressing vulcanization, wherein the rubber is ethylene propylene diene monomer.
2. An enhancement process for improving the overall performance of a shock absorbing bicycle component as claimed in claim 1, wherein: in the step (2), the acid electrolyte is obtained by dissolving sulfuric acid in water according to the mass concentration of 8-15%, and the temperature of the acid electrolyte is 25-30 ℃; the current density of the external current is 1-1.5A/dm2The oxidation time is 20-30 min.
3. An enhancement process for improving the overall performance of a shock absorbing bicycle component as claimed in claim 1, wherein: the specific operation of the heat treatment in the step (3),
and (3) placing the aluminum alloy section subjected to anodic oxidation in the step (2) in an aging heat treatment furnace, raising the furnace temperature of the aging heat treatment furnace to 200-230 ℃ at the speed of 5-10 ℃/min and keeping the temperature for 1-2 h, raising the furnace temperature to 530-550 ℃ at the speed of 15-20 ℃/min and keeping the temperature for 15-20 h, opening the furnace door, closing the furnace door when the furnace temperature naturally falls to 120-135 ℃, carrying out heat preservation treatment for 5-8 h, finally taking out the aluminum alloy section from the furnace, and carrying out water cooling at the low temperature of 5 ℃ to the normal temperature.
4. An enhancement process for improving the overall performance of a shock absorbing bicycle component as claimed in claim 1, wherein: the specific operation of the step (5) is that,
and (3) plasticating the rubber by using an open mill, adding an auxiliary agent containing a vulcanizing agent and a plasticizer into the rubber for mixing, dispersing the mixed rubber material into an organic solvent to obtain rubber cement, uniformly coating the rubber cement on the surface of the aluminum alloy section pretreated in the step (4), drying, and carrying out mould pressing vulcanization on the aluminum alloy section on a vulcanizing machine.
5. An enhancement process for improving the overall performance of a shock absorbing bicycle component as claimed in claim 4, wherein: in the step (5), the mass ratio of the rubber material to the organic solvent is 1: 4.
6. An enhancement process for improving the overall performance of a shock absorbing bicycle component as claimed in claim 4, wherein: in the step (5), the vulcanization pressure during mold pressing vulcanization is 4-8 MPa, the vulcanization temperature is 100-120 ℃, and the vulcanization time is 5-15 minutes.
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| CN104212007A (en) * | 2014-08-27 | 2014-12-17 | 安徽微威胶件集团有限公司 | Magnetic damping rubber material and preparation method thereof |
| CN106752713A (en) * | 2016-12-23 | 2017-05-31 | 河南圣华原铝业有限公司 | A kind of wear-resistant aluminum alloy section bar and preparation method thereof |
| CN107059026A (en) * | 2017-07-05 | 2017-08-18 | 合肥万之景门窗有限公司 | A kind of surface treatment method of aluminum alloy materials |
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