CN113981502A - Aluminum alloy surface corrosion-resistant antifriction composite coating and preparation method thereof - Google Patents
Aluminum alloy surface corrosion-resistant antifriction composite coating and preparation method thereof Download PDFInfo
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- 239000003822 epoxy resin Substances 0.000 claims description 12
- 229920000647 polyepoxide Polymers 0.000 claims description 12
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- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
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- 229910052911 sodium silicate Inorganic materials 0.000 claims description 4
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- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 3
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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
-
- 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
-
- 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
- C25D13/04—Electrophoretic coating characterised by the process with organic material
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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 an aluminum alloy surface corrosion-resistant antifriction composite coating and a preparation method thereof. The invention discloses an anti-corrosion and anti-friction composite coating on an aluminum alloy surface, which comprises a micro-arc oxidation coating covered on an aluminum alloy substrate, wherein an electrophoretic deposition coating is arranged on the micro-arc oxidation coating, the micro-arc oxidation coating is porous, and the electrophoretic deposition coating covers the porous. Also discloses a preparation method of the aluminum alloy surface corrosion-resistant antifriction composite coating, which comprises the following steps: s1: micro-arc oxidation treatment, namely forming a rough and porous micro-arc oxidation coating on the surface of the aluminum alloy substrate; s2: and (4) performing electrophoretic deposition treatment, and depositing a layer of electrophoretic paint film on the surface of the aluminum alloy base material obtained in the step S1. The invention improves the corrosion resistance and the lubricating property of the aluminum alloy and reduces the friction coefficient of the composite coating.
Description
Technical Field
The invention relates to the technical field of surface treatment of aluminum alloy, in particular to an aluminum alloy surface corrosion-resistant antifriction composite coating and a preparation method thereof.
Background
Aluminum alloys are widely used in various fields because of their advantages such as low density and easy processing. However, the aluminum alloy is easy to corrode and wear under severe working conditions, which limits the application of the aluminum alloy in specific working environments. Many surface modification techniques have been developed to date for corrosion and wear protection of aluminum alloys, including thermal spraying, vapor deposition, laser remelting, Micro Arc Oxidation (MAO), and electrodeposition, among others.
MAO is a surface treatment technology based on anodic oxidation, compared with other surface treatment technologies, the MAO process only generates plasma arcs in a local area of a substrate, the existence time is short, the substrate cannot be damaged by overhigh heat load, meanwhile, the MAO coating is strong in binding force with the substrate, and the coating has better corrosion resistance and frictional wear resistance. Under the environment advocating energy conservation and environmental protection, the MAO technology has wide application value due to low pollution, simple process and outstanding comprehensive performance.
The MAO coating, although exhibiting good frictional wear properties, erupts internal melts during the preparation process due to breakdown discharge, resulting in the formation of a porous and microcracked structure. These pores and cracks lead to incomplete isolation of the corrosion medium from the substrate by the MAO coating, which severely affects the corrosion resistance of the MAO coating.
Disclosure of Invention
The invention discloses an aluminum alloy surface corrosion-resistant antifriction composite coating and a preparation method thereof, which are used for improving the corrosion resistance and the lubricating property of aluminum alloy and reducing the friction coefficient of the composite coating.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides an aluminum alloy surface anti-corrosion antifriction composite coating, is including covering the micro arc oxidation coating on the aluminum alloy substrate, be provided with the electrophoretic deposition coating on the micro arc oxidation coating, the micro arc oxidation coating has the porosity, the electrophoretic deposition coating covers on the porosity.
A preparation method of an aluminum alloy surface corrosion-resistant antifriction composite coating comprises the following steps:
s1: pouring the micro-arc oxidation electrolyte into an electrolytic bath, and carrying out micro-arc oxidation treatment by taking the aluminum alloy substrate as an anode, the electrolytic bath as a cathode and the micro-arc oxidation solution as the electrolyte to form a rough and porous micro-arc oxidation coating on the surface of the aluminum alloy substrate;
s2: and pouring the electrophoretic deposition electrolyte into an electrolytic bath, performing electrophoretic deposition treatment by using the aluminum alloy base material obtained in the step S1 as a cathode and using the electrolytic bath as an anode, and depositing an electrophoretic deposition coating on the surface of the aluminum alloy base material obtained in the step S1.
Further, in step S1, the micro-arc oxidation electrolyte includes sodium silicate, sodium hexametaphosphate, potassium hydroxide, sodium chloride, and ethylenediaminetetraacetic acid in a weight ratio of 5:2:3:3: 3.
Further, in step S1, before the aluminum alloy substrate is used as an anode, the surface of the aluminum alloy substrate is subjected to polishing, water washing, ultrasonic treatment, and blow-drying pretreatment.
Further, in step S1, after the micro-arc oxidation coating with rough and porous surfaces is formed on the surface of the aluminum alloy substrate, cleaning and drying processes are performed.
Further, in step S1, the electrical parameters of the micro-arc oxidation treatment are: the positive voltage is 350-450V, the negative voltage is 98-102V, the power frequency is 600-700Hz, and the positive duty ratio is 20-25%; the electrical parameters of the electrophoretic deposition process in step S2 are: direct current 360-.
Further, in step S1, the forward voltage of the micro-arc oxidation treatment is set to two stages, the first stage voltage is 355-360V, and the treatment is carried out for 6-7 min; the second stage voltage is 435-.
Further, the preparation method of the electrophoretic deposition electrolyte comprises the following steps:
s1: uniformly mixing the epoxy resin electrophoretic paint and deionized water, and performing electrophoretic deposition for multiple times at the voltage of 360-440V, wherein the solid content of the epoxy resin electrophoretic paint is 12 wt%;
s2: after the electrophoretic deposition, nickel, carbon nanotubes and a sodium polycarboxylate dispersant are added into the solution obtained in the step S1 and mixed uniformly.
Further, in step S1, the weight ratio of the epoxy resin electrophoretic paint to the deionized water is 4: 1; in step S2, the weight ratio of nickel, carbon nanotubes, and sodium polycarboxylate dispersant is 1: 1: 1.
furthermore, the length of the carbon nano tube is 1-30 μm, and the diameter is 8-15 nm.
The subject name of the invention has the beneficial effects that:
1. the composite coating is formed by the micro-arc oxidation coating and the electrophoretic deposition coating, wherein the micro-arc oxidation coating and the aluminum alloy base material have good combination characteristics, so that the coated aluminum alloy base material has good corrosion resistance and frictional wear resistance; the electrophoretic deposition coating can successfully plug the multi-hole of the micro-arc oxidation coating, so that the composite coating has the advantages of uniform and dense coating and excellent lubricating property;
2. the invention relates to a preparation method of a corrosion-resistant antifriction composite coating on an aluminum alloy surface, which comprises the steps of firstly preparing a micro-arc oxidation coating on the surface of an aluminum alloy substrate by adopting a micro-arc oxidation technology, then immersing the aluminum alloy substrate coated with the micro-arc oxidation coating into an electrophoretic deposition electrolyte for electrophoretic deposition, and preparing the composite coating on the surface of the aluminum alloy by adopting the micro-arc oxidation-electrophoretic deposition composite technology.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a surface topography of a micro-arc oxidation coating in the corrosion-resistant antifriction composite coating disclosed by the invention;
FIG. 2 is a cross-sectional view of a micro-arc oxidation coating in the corrosion-resistant antifriction composite coating disclosed by the invention;
FIG. 3 is an EDS composition analysis chart of the surface of the anti-corrosion antifriction composite coating disclosed by the invention;
FIG. 4 is an EDS (electronic data System) component analysis diagram of a cross section of the anti-corrosion antifriction composite coating disclosed by the invention;
FIG. 5 is an infrared spectrum of the corrosion-resistant and friction-reducing composite coating disclosed by the invention;
FIG. 6 is a graph showing the variation of the thickness of the electrophoretic deposition coating with voltage of the anti-corrosion and anti-friction composite coating disclosed in the present invention;
FIG. 7 is a graph of the cross-hatch experimental results for an aluminum alloy/electrodeposited coating disclosed in the present invention;
FIG. 8 is a cross-cut experimental result chart of the corrosion-resistant antifriction composite coating disclosed by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 8 of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
Preparation example
Preparation example of micro-arc oxidation electrolyte: each liter of micro-arc oxidation electrolyte is prepared by uniformly mixing 5g of sodium silicate, 2g of sodium hexametaphosphate, 3g of potassium hydroxide, 3g of sodium chloride and 3g of ethylene diamine tetraacetic acid.
Preparation of electrophoretic deposition electrolyte:
s1: adding 1L of epoxy resin electrophoretic paint and 5L of deionized water into a beaker, stirring for 20min by a magnetic stirrer at normal temperature, setting the distance to be 6cm, setting the deposition time to be 30s, and setting the voltage range to be 360V, and finishing electrophoretic deposition;
s2: after electrophoretic deposition, adding 3g of nickel and 3g of carbon nano tubes into the solution obtained in the step S1, adding 1L of sodium polycarboxylate dispersant 3g/L at the same time, and stirring for 1h by magnetic stirring to obtain electrophoretic deposition electrolyte;
wherein, the length of the carbon nano tube is 10 μm, the diameter is 10nm, and the purity is 98 wt%.
Example (b):
example 1
The preparation method of the corrosion-resistant antifriction composite coating on the ZL109 aluminum alloy base material comprises the following steps:
s1: selecting ZL109 aluminum alloy (40mm multiplied by 10mm) as an aluminum alloy base material, polishing the surface of the aluminum alloy base material by 400 # sand paper, 600 # sand paper, 800 # sand paper, 1000 # sand paper and 1200# sand paper in sequence, then carrying out ultrasonic cleaning for 5min by using washing water, and then drying by using natural wind;
taking the dried aluminum alloy substrate as an anode, taking an electrolytic cell as a cathode, pouring a micro-arc oxidation electrolyte into the electrolytic cell, and performing micro-arc oxidation treatment by adopting a bipolar power supply under the condition of constant voltage mode and temperature control at 25 ℃ to obtain a rough and porous micro-arc oxidation coating; then washing with deionized water for 1min, and baking at 170 deg.C for 40 min;
the electrical parameters of the micro-arc oxidation treatment are as follows: negative voltage of 100V, power frequency of 600Hz and positive duty ratio of 20 percent, and positive voltage is set to be two stages, wherein the positive voltage of 360V, the power frequency of 600Hz and the positive duty ratio of 20 percent are in the first stage, and oxidation reaction is carried out for 6 min; the forward voltage of the second stage is 440V, the power frequency is 600Hz, the forward duty ratio is 20%, and the oxidation reaction is carried out for 6 min;
s2: taking the dried aluminum alloy substrate containing the micro-arc oxidation coating as a cathode, pouring electrophoretic deposition electrolyte into an electrolytic bath, carrying out electrophoretic deposition treatment at a direct current constant voltage of 390V and at a temperature of 25 ℃ for 30s to enable the electrophoretic deposition coating to cover the micro-arc oxidation coating, and thus obtaining the aluminum alloy substrate containing the micro-arc oxidation/electrophoretic deposition composite coating;
baking the aluminum alloy base material containing the micro-arc oxidation/electrophoretic deposition composite coating at the temperature of 170 ℃ for 40min for solidification, and then naturally cooling.
The total thickness of the anti-corrosion and anti-friction composite coating on the surface of the aluminum alloy substrate of the micro-arc oxidation/electrophoretic deposition composite coating prepared in the embodiment is 9.2 micrometers, wherein the thickness of the micro-arc oxidation coating is 5 micrometers, and the thickness of the electrophoretic deposition coating is 4.2 micrometers.
The performance test of the corrosion-resistant antifriction composite coating provided in the above example 1 was carried out:
(1) in the preparation process of step S1, a scanning electron microscope (VEGA-3 teskin) is used to determine the surface topography of the micro-arc oxidation coating on the surface of the aluminum alloy substrate, the detection result is shown in fig. 1, and as can be seen from fig. 1, a plurality of deep hole structures are uniformly distributed on the surface of the micro-arc oxidation coating.
(2) In the preparation process of step S1, a scanning electron microscope (VEGA-3 teskin) is used to determine the cross-sectional morphology of the micro-arc oxidation coating on the surface of the aluminum alloy substrate, and the detection result is shown in fig. 2, and it can be seen from fig. 2 that the bonding state of the micro-arc oxidation coating and the aluminum alloy substrate is tight.
(3) Measurement of surface and section element composition test: the components of the surface and the cross section of the anti-corrosion antifriction composite coating are measured by an energy dispersive X-ray spectrometer (EDS), the measurement temperature is kept at 25 ℃, and the detection result is shown in figure 3, figure 4 and table 1.
TABLE 1
As can be seen from the combination of FIG. 3 and FIG. 4 and Table 1, the C peak and the O peak are very strong in the figure, and the characteristic element nickel of the nickel-carbon nanotube is present at the same time, which indicates that the electrophoretic deposition coating is successfully deposited on the surface of the micro-arc oxidation coating, and the characteristic elements Si and Al of the micro-arc oxidation coating and the aluminum alloy substrate are present in the defect of the composite coating in a small amount, which indicates that the electrophoretic deposition coating substantially covers the micro-arc oxidation coating, and the covering effect is good. The nickel-carbon nano tube is carried into the holes of the micro-arc oxidation coating by the epoxy resin, the effective components of the surface electrophoretic deposition coating are deposited into the holes of the micro-arc oxidation coating, and the blocking effect is realized, wherein the existence of the gold element is caused by gold precipitation.
(4) And (3) measuring the infrared spectrum test of the corrosion-resistant antifriction composite coating: the test wavelength range is 0-4000cm-1(IRPrestige-21-AIM-8800, Shimadzu Co., Ltd.), the results of the measurement are shown in FIG. 5.
As can be seen from FIG. 5, 3431.36cm-1is-OH associated stretching vibration peak, 2958.80cm-1is-CH2Asymmetric stretching vibration, 1734.01cm-1is-C-O stretching vibration, 1560.41cm-1It is the bonding of-COO and Al probably because-COOH in the epoxy resin contacts the aluminum alloy substrate through the micro-arc oxidation coating defect and reacts partially with Al to form-COOAl. 1477.47cm-1is-CH2Flexural vibration, 1384.89cm-1、754.17cm-1And 815.89 is-CH3Peak value of vibration of 1240.23cm-1is-C-O-C asymmetric stretching vibration, 1166.93cm-1is-C-O-C symmetrical telescopic vibration, 1020.34cm-1Is the peak value of the vibration at-C-C of 507.28cm-1And 424.34cm-1Is the peak value of vibration of Al-O bond [24,25]. In conclusion, the epoxy resin can form a film on the micro-arc oxidation coating well.
Example 2: the difference from example 1 is that in step S2, the voltage for electrophoretic deposition is 360V.
Example 3: the difference from example 1 is that in step S2, the voltage for electrophoretic deposition was 400V.
Example 4: the difference from example 1 is that in step S2, the voltage for electrophoretic deposition is 440V.
The performance test of the corrosion-resistant antifriction composite coating provided in the above examples 1 to 4 was carried out:
in the preparation process of the embodiment 1-4 of the preparation method of the corrosion-resistant antifriction composite coating, the thickness of the electrophoretic deposition coating in the electrophoretic deposition treatment process is measured, 10 positions are randomly selected on the section of the sample for marking, the thickness of the marked positions is tested by adopting a scanning electron microscope (VEGA-3 Tessincon), the average value of the thicknesses is taken, and the detection result is shown in figure 6.
As can be seen from FIG. 6, the thickness of the electrodeposition coating layer shows a linear increasing tendency of gradually decreasing slope with increasing voltage, and the thickness of the electrodeposition coating layer is about 4.2 μm at the final selected voltage of 390V due to the lower strength of the electrodeposition coating layer.
Comparative example
Comparative example 1:
the preparation method of the corrosion-resistant antifriction composite coating on the ZL109 aluminum alloy base material comprises the following steps:
selecting ZL109 aluminum alloy (40mm multiplied by 10mm) as an aluminum alloy base material, polishing the surface of the aluminum alloy base material by 400 # sand paper, 600 # sand paper, 800 # sand paper, 1000 # sand paper and 1200# sand paper in sequence, then carrying out ultrasonic cleaning for 5min by using washing water, and then drying by using natural wind;
taking the dried aluminum alloy substrate as a cathode, pouring electrophoretic deposition electrolyte into an electrolytic bath, carrying out electrophoretic deposition treatment at a direct current constant voltage of 390V and a temperature of 25 ℃ for 30s to obtain the aluminum alloy substrate containing the electrophoretic deposition composite coating;
and (3) baking the aluminum alloy substrate containing the electrophoretic deposition composite coating at the temperature of 170 ℃ for 40min for solidification, and then naturally cooling.
Comparative example 2: the difference from the embodiment 1 is that, in step S1, each liter of micro-arc oxidation electrolyte is prepared by uniformly mixing 5g of sodium silicate, 5g of sodium tungstate, 3g of potassium hydroxide and 3g of ethylene diamine tetraacetic acid.
Comparative example 3: the difference from example 1 is that the electrophoretic deposition electrolyte in step S2 is prepared as follows:
s1: adding 1L of acrylic resin electrophoretic paint and 5L of deionized water into a beaker, stirring for 20min by a magnetic stirrer at normal temperature, setting the distance to be 6cm, setting the deposition time to be 30s, and setting the voltage range to be 390V, and finishing electrophoretic deposition;
s2: after electrophoretic deposition, adding 3g of nickel and 3g of carbon nano tube into the solution obtained in the step S1, adding 1L of 6g/L polyethylene glycol dispersant, and stirring for 1h by magnetic stirring to obtain electrophoretic deposition electrolyte;
wherein, the length of the carbon nano tube is 10 μm, the diameter is 10nm, and the purity is 98 wt%.
Comparative example 4: the difference from example 1 is that nickel and carbon nanotubes are not added to the electrophoretic deposition electrolyte of step S2.
Comparative example 5:
the preparation method of the corrosion-resistant antifriction composite coating on the ZL109 aluminum alloy base material comprises the following steps:
s1: selecting ZL109 aluminum alloy (40mm multiplied by 10mm) as an aluminum alloy base material, polishing the surface of the aluminum alloy base material by 400 # sand paper, 600 # sand paper, 800 # sand paper, 1000 # sand paper and 1200# sand paper in sequence, then carrying out ultrasonic cleaning for 5min by using washing water, and then drying by using natural wind;
taking the dried aluminum alloy substrate as an anode, taking an electrolytic cell as a cathode, pouring a micro-arc oxidation electrolyte into the electrolytic cell, and performing micro-arc oxidation treatment by adopting a bipolar power supply under the condition of constant voltage mode and temperature control at 25 ℃ to obtain a rough and porous micro-arc oxidation coating; then washing with deionized water for 1min, baking at 170 deg.C for 40min, and naturally cooling;
the electrical parameters of the micro-arc oxidation treatment are as follows: negative voltage of 100V, power frequency of 600Hz and positive duty ratio of 20 percent, and positive voltage is set to be two stages, wherein the positive voltage of 360V, the power frequency of 600Hz and the positive duty ratio of 20 percent are in the first stage, and oxidation reaction is carried out for 6 min; the forward voltage of the second stage is 440V, the power frequency is 600Hz, the forward duty ratio is 20%, and the oxidation reaction is 6 min.
Tests for testing the performances of the anti-corrosion and anti-friction composite coatings provided in the above examples 1 to 4 and comparative examples 1 to 5
The detection method of the friction and the abrasion of the corrosion-resistant antifriction composite coating comprises the following steps: the method comprises the steps of adopting a home-made reciprocating type friction and wear testing machine for the Dalian maritime affairs, under the conditions of room temperature and dry lubrication, carrying out a friction and wear test on the anti-corrosion and anti-friction composite coating and the aluminum alloy base material prepared by the method under the conditions of 50N load, 0.2m/s sliding speed, 30min time and 30mm sliding distance, measuring to obtain friction and wear data, calculating the friction coefficient mu of the anti-corrosion and anti-friction composite coating, wherein mu is f multiplied by N, and f is the friction force read by the reciprocating type friction and wear testing machine; and N is the load read by the reciprocating friction wear tester. The test results are shown in Table 2.
The method for detecting the contact angle of the corrosion-resistant antifriction composite coating comprises the following steps: and measuring the static water contact angle of the anti-corrosion antifriction composite coating and the aluminum alloy substrate by using an optical contact angle measuring instrument, wherein the measurement result is shown in table 2.
The method for detecting the polarization resistance of the corrosion-resistant antifriction composite coating comprises the following steps: in the preparation processes of the above examples 1 to 4 and comparative examples 1 to 5, the corrosion current density of the anti-corrosion and anti-friction composite coating and the aluminum alloy substrate was measured by using an electrochemical workstation (CHI604E Shanghai Hua), and the polarization resistance (Rp) was calculated by using the Stern-great formula. The Stern-great formula is as follows:
wherein ba represents the anode Tafel coefficient of the sample polarization curve, bc represents the cathode Tafel coefficient of the sample polarization curve, Ic (A/cm)2) The corrosion current density of the sample is shown. The results are shown in Table 2.
TABLE 2
From the above table, it can be seen that: the corrosion current density of the sample after the micro-arc oxidation/electrophoretic deposition composite treatment is lowest; the polarization impedance is highest; the contact angle of water is the largest, the contact angle of the micro-arc oxidation/electrophoretic deposition composite coating is 123 degrees, the epoxy resin in the electrophoretic deposition coating can be used as a physical barrier, and the hydrophobic surface of the epoxy resin has a repellent effect on water. By comparison, the micro-arc oxidation/electrophoretic deposition composite coating has the largest hydrophobic angle, and is more beneficial to improving the corrosion resistance of the surface of the aluminum alloy substrate.
It can be seen from fig. 7 and 8 and table 2 that after the micro-arc oxidation/electrophoretic deposition composite coating is scribed, almost no coating falls off at the periphery and surface of the scratch, the electrophoretic deposition coating has stronger adhesion on the substrate of the micro-arc oxidation coating, and because the electric field intensity at the micro-hole and crack defect part of the micro-arc oxidation coating is higher than that of the defect-free area during the electrophoretic deposition process, the charged colloidal particles in the electrophoretic solution can preferentially enter the micro-hole and crack part to be deposited under the action of the electric field force, and the electrophoretic deposition coating and the micro-arc oxidation coating are tightly embedded after curing, so that the bonding force of the electrophoretic deposition coating is remarkably enhanced, and the electrophoretic deposition coating can exert the antifriction effect. The micro-arc oxidation/electrophoretic deposition composite coating shows excellent antifriction effect, the friction coefficient is reduced by about 65% compared with that of an aluminum alloy base material and 25% compared with a sample without the nickel-carbon nano tube, and the nickel-carbon nano tube in the composite coating is released along with partial abrasion of the electrophoretic deposition coating, so that the lubricating effect is achieved between friction pairs, and the friction coefficient is greatly reduced.
In view of the above, it can be seen that,
(1) the thickness of the electrophoretic deposition coating shows a linear increasing trend with the increasing voltage, and the electrophoretic deposition coating just covers and tightly bonds the micro-arc oxidation coating when the deposition time is 20s and the deposition voltage is 390V. The holes on the surface of the micro-arc oxidation coating are successfully plugged by the electrophoretic deposition coating, and the bonding force between the micro-arc oxidation/electrophoretic deposition coating and the aluminum alloy base material is stronger;
(2) the micro-arc oxidation/electrophoretic deposition coating can effectively isolate the aluminum alloy substrate from the corrosive environment to improve the corrosion resistance of the sample, the corrosion current density is reduced by three orders of magnitude compared with that of the substrate, and the polarization resistance is 278.46 times that of the aluminum alloy substrate;
(3) after 30min friction and wear experiments under the condition of dry lubrication, the micro-arc oxidation/electrophoretic deposition coating still keeps certain integrity and shows excellent antifriction effect.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The anti-corrosion and anti-friction composite coating for the aluminum alloy surface is characterized by comprising a micro-arc oxidation coating covering an aluminum alloy substrate, wherein an electrophoretic deposition coating is arranged on the micro-arc oxidation coating, the micro-arc oxidation coating is porous, and the electrophoretic deposition coating covers the porous.
2. The preparation method of the aluminum alloy surface corrosion-resistant antifriction composite coating according to claim 1, characterized by comprising the following steps:
s1: taking an aluminum alloy substrate as an anode, an electrolytic bath as a cathode and micro-arc oxidation liquid as electrolyte, and performing micro-arc oxidation treatment to form a rough and porous micro-arc oxidation coating on the surface of the aluminum alloy substrate;
s2: and pouring the electrophoretic deposition electrolyte into an electrolytic bath, performing electrophoretic deposition treatment by using the aluminum alloy base material obtained in the step S1 as a cathode and using the electrolytic bath as an anode, and depositing an electrophoretic deposition coating on the surface of the aluminum alloy base material obtained in the step S1.
3. The method for preparing the corrosion-resistant and friction-reducing composite coating on the surface of the aluminum alloy according to claim 2, wherein in step S1, the micro-arc oxidation electrolyte comprises sodium silicate, sodium hexametaphosphate, potassium hydroxide, sodium chloride and ethylene diamine tetraacetic acid in a weight ratio of 5:2:3:3: 3.
4. The method for preparing the corrosion-resistant and friction-reducing composite coating on the surface of the aluminum alloy according to claim 2, wherein in step S1, before the aluminum alloy substrate is used as an anode, the surface of the aluminum alloy substrate is subjected to polishing, water washing, ultrasonic treatment and blow drying pretreatment.
5. The method for preparing the corrosion-resistant and friction-reducing composite coating on the surface of the aluminum alloy as claimed in claim 2, wherein in step S1, after the micro-arc oxidation coating with rough and porous surfaces is formed on the surface of the aluminum alloy substrate, the cleaning and drying treatment is carried out.
6. The method for preparing the corrosion-resistant and friction-reducing composite coating on the surface of the aluminum alloy according to the claim 2, wherein in the step S1, the electrical parameters of the micro-arc oxidation treatment are as follows: the positive voltage is 350-450V, the negative voltage is 98-102V, the power frequency is 600-700Hz, and the positive duty ratio is 20-25%; the electrical parameters of the electrophoretic deposition process in step S2 are: direct current 360-.
7. The method for preparing the corrosion-resistant and friction-reducing composite coating on the surface of the aluminum alloy as claimed in claim 2, wherein in the step S1, the forward voltage of the micro-arc oxidation treatment is set to two stages, the voltage in the first stage is 355-360V, and the treatment is carried out for 6-7 min; the second stage voltage is 435-.
8. The preparation method of the corrosion-resistant antifriction composite coating on the surface of the aluminum alloy according to claim 2, characterized in that the preparation method of the electrophoretic deposition electrolyte comprises the following steps:
s1: uniformly mixing the epoxy resin electrophoretic paint and deionized water, and performing electrophoretic deposition for multiple times at the voltage of 360-440V, wherein the solid content of the epoxy resin electrophoretic paint is 12 wt%;
s2: after the electrophoretic deposition, nickel, carbon nanotubes and a sodium polycarboxylate dispersant are added into the solution obtained in the step S1 and mixed uniformly.
9. The method for preparing the corrosion-resistant and friction-reducing composite coating on the surface of the aluminum alloy according to the claim 8, wherein in the step S1, the weight ratio of the epoxy resin electrophoretic paint to the deionized water is 4: 1; in step S2, the weight ratio of nickel, carbon nanotubes, and sodium polycarboxylate dispersant is 1: 1: 1.
10. the method for preparing the corrosion-resistant and friction-reducing composite coating on the surface of the aluminum alloy according to claim 8, wherein the length of the carbon nano tube is 1-30 μm, and the diameter of the carbon nano tube is 8-15 nm.
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