1. The preparation method of the corrosion-resistant high-temperature sensitive aluminum alloy is characterized in that the process flow for preparing the corrosion-resistant high-temperature sensitive aluminum alloy comprises the steps of polishing, oil removal, alkaline etching, primary coating, secondary coating, electrochemical treatment and finished product preparation.

2. The method for preparing the corrosion-resistant high-temperature sensitive aluminum alloy according to claim 1, characterized by comprising the following specific steps:

(1) carrying out double-side polishing on the aluminum alloy substrate by using sand paper, and controlling the polishing direction and the polishing force;

(2) carrying out surface treatment on the aluminum alloy matrix by using the mixed solution 1, and simultaneously cleaning by using ultrasonic waves;

(3) carrying out alkaline etching treatment on the cleaned aluminum alloy matrix by using the mixed solution 2;

(4) carrying out primary plating on the aluminum alloy matrix subjected to the alkaline etching treatment by using the mixed solution 3;

(5) carrying out vacuum treatment on the secondary coating of the aluminum alloy matrix after the primary coating by using the modified cerium oxide;

(6) and electrifying the aluminum alloy matrix of the secondary coating and treating under the conditions of high temperature and high pressure to prepare the corrosion-resistant high-temperature sensitive aluminum alloy.

3. The method for preparing the corrosion-resistant high-temperature sensitive aluminum alloy according to claim 2, wherein in the step (1), the abrasive paper is one of No. 800 and No. 1000, the grinding direction is the same, and the grinding force is 10-20N.

4. The preparation method of the corrosion-resistant high-temperature-sensitive aluminum alloy according to claim 2, wherein in the step (2), the mixed solution 1 is prepared by mixing sodium carbonate, sodium phosphate and sodium dodecyl benzene sulfonate according to a mass ratio of 10:10: 1-20: 20:1, the treatment temperature is 40-50 ℃, the treatment time is 5-8 min, the ultrasonic time is 15-20 min, and the ultrasonic frequency is 20-40 kHz.

5. The method for preparing the corrosion-resistant high-temperature-sensitive aluminum alloy according to claim 2, wherein in the step (3), the mixed solution 2 is prepared by mixing perhydroxide and sodium dodecyl benzene sulfonate according to a mass ratio of 25: 1-35: 2, the alkali etching temperature is 40-50 ℃, and the alkali etching time is 8-10 s.

6. The method for preparing the corrosion-resistant high-temperature sensitive aluminum alloy according to claim 2, wherein in the step (4), the mixed solution 3 is prepared by mixing nickel sulfate, sodium hypophosphite, sodium acetate, malic acid and lactic acid according to a mass ratio of 30:13:7: 4-50: 21:7:4:4, the thickness of the plating layer is 15-25 μm, and the temperature of the plating layer is 30-40 ℃.

7. The method for preparing the corrosion-resistant high-temperature-sensitive aluminum alloy according to claim 2, wherein in the step (5), the modified cerium oxide is prepared by drying cerium oxide powder at 200-250 ℃, preparing a mixed solution of stearic acid and acetone according to a mass ratio of 1: 2-1: 3, adding cerium oxide of which the mass is 0.4-0.6 times of that of the mixed solution into the mixed solution, stirring and dispersing the mixture uniformly, standing the mixture for 20-30 min, filtering the mixture, washing the mixture for 1-2 times with water, and drying the mixture at 100-200 ℃ to obtain the modified cerium oxide; the thickness of the plating layer is 15-30 mu m, and the temperature of the plating layer is 30-40 ℃.

8. The method for preparing the corrosion-resistant high-temperature sensitive aluminum alloy according to claim 2, wherein in the step (6), the treatment temperature is 140-150 ℃, the treatment pressure is 200-300 MPa, and the treatment voltage is 50-60 kV.

9. The method for preparing the corrosion-resistant high-temperature-sensitive aluminum alloy according to claim 1, wherein the aluminum alloy material prepared by the method comprises, by weight, 70-90 parts of an aluminum alloy matrix, 90-100 parts of a mixed solution 1, 20-30 parts of a mixed solution 2, 80-100 parts of a mixed solution 3 and 80-100 parts of modified cerium oxide; the mixed solution 1 is prepared by mixing sodium carbonate, sodium phosphate and sodium dodecyl benzene sulfonate; the mixed solution 2 is prepared by mixing perhydroxide and sodium dodecyl benzene sulfonate; the mixed solution 3 is prepared by mixing nickel sulfate, sodium hypophosphite, sodium acetate, malic acid and lactic acid.

Background

The aluminum alloy has excellent physical, chemical, mechanical and processing properties, can meet various use requirements from kitchens to advanced science and technology, construction, transportation, aerospace and other industries, particularly in aerospace metal structure materials such as airplanes, spacecrafts and the like, the use amount of the aluminum alloy accounts for most of main materials, but some properties of the aluminum alloy are not ideal at present, such as poor wear resistance, corrosion resistance, heat resistance and other weaknesses, so that the application range is limited to a certain extent.

The corrosion-resistant high-temperature sensitive aluminum alloy prepared by the invention has the properties of high strength, hydrophobicity, self-cleaning and corrosion resistance, can be widely applied to various industries, solves various difficult and complicated diseases, improves the national economic construction and enhances the national creativity.

Disclosure of Invention

The invention aims to provide a corrosion-resistant high-temperature sensitive aluminum alloy and a preparation method thereof, which are used for solving the problems in the prior art.

In order to solve the technical problems, the invention provides the following technical scheme that the preparation method of the corrosion-resistant high-temperature sensitive aluminum alloy is characterized by comprising the following process flows of:

polishing, oil removal, alkaline etching, primary plating, secondary plating, electrochemical treatment and finished product.

Further, the preparation method of the corrosion-resistant high-temperature sensitive aluminum alloy comprises the following specific steps:

(1) carrying out double-side polishing on the aluminum alloy substrate by using sand paper, and controlling the polishing direction and the polishing force;

(2) carrying out surface treatment on the aluminum alloy matrix by using the mixed solution 1, and simultaneously cleaning by using ultrasonic waves;

(3) carrying out alkaline etching treatment on the cleaned aluminum alloy matrix by using the mixed solution 2;

(4) carrying out primary plating on the aluminum alloy matrix subjected to the alkaline etching treatment by using the mixed solution 3;

(5) carrying out vacuum treatment on the secondary coating of the aluminum alloy matrix after the primary coating by using the modified cerium oxide;

(6) and electrifying the aluminum alloy matrix of the secondary coating and treating under the conditions of high temperature and high pressure to prepare the corrosion-resistant high-temperature sensitive aluminum alloy.

Furthermore, in the step (1), the sand paper is one of 800# and 1000#, the polishing direction is in the same direction, and the polishing force is 10-20N.

Further, in the step (2), the mixed solution 1 is prepared by mixing sodium carbonate, sodium phosphate and sodium dodecyl benzene sulfonate according to a mass ratio of 10:10: 1-20: 20:1, the treatment temperature is 40-50 ℃, the treatment time is 5-8 min, the ultrasonic time is 15-20 min, and the ultrasonic frequency is 20-40 kHz.

Further, in the step (3), the mixed solution 2 is prepared by mixing perhydroxide and sodium dodecyl benzene sulfonate according to the mass ratio of 25: 1-35: 2, the alkali etching temperature is 40-50 ℃, and the alkali etching time is 8-10 s.

Further, in the step (4), the mixed solution 3 is prepared by mixing nickel sulfate, sodium hypophosphite, sodium acetate, malic acid and lactic acid according to the mass ratio of 30:13:7:4: 4-50: 21:7:4:4, the thickness of the plating layer is 15-25 μm, and the temperature of the plating layer is 30-40 ℃.

Further, in the step (5), the modified cerium oxide is prepared by drying cerium oxide powder at 200-250 ℃, preparing a mixed solution of stearic acid and acetone according to a mass ratio of 1: 2-1: 3, adding cerium oxide of which the mass is 0.4-0.6 times of that of the mixed solution into the mixed solution, stirring and dispersing the mixture uniformly, standing the mixture for 20-30 min, filtering the mixture, washing the mixture for 1-2 times with water, and drying the mixture at 100-200 ℃ to obtain the modified cerium oxide, wherein the thickness of a coating is 15-30 mu m, and the temperature of the coating is 30-40 ℃.

Further, in the step (6), the treatment temperature is 140-150 ℃, the treatment pressure is 200-300 MPa, and the treatment voltage is 50-60 kV.

Further, the aluminum alloy material prepared by the preparation method of the corrosion-resistant high-temperature sensitive aluminum alloy comprises the following raw materials, by weight, 70-90 parts of an aluminum alloy matrix, 90-100 parts of a mixed solution 1, 20-30 parts of a mixed solution 2, 80-100 parts of a mixed solution 3 and 80-100 parts of modified cerium oxide; the mixed solution 1 is prepared by mixing sodium carbonate, sodium phosphate and sodium dodecyl benzene sulfonate; the mixed solution 2 is prepared by mixing perhydroxide and sodium dodecyl benzene sulfonate; the mixed solution 3 is prepared by mixing nickel sulfate, sodium hypophosphite, sodium acetate, malic acid and lactic acid.

Compared with the prior art, the invention has the following beneficial effects:

the invention firstly polishes the two sides of an aluminum alloy matrix, carries out surface treatment on the aluminum alloy matrix by using a mixed solution of sodium carbonate, sodium phosphate and sodium dodecyl benzene sulfonate, removes impurities and grease carried by polishing on the aluminum alloy matrix by using ultrasonic waves, and then carries out alkaline etching treatment on the aluminum alloy matrix by using a mixed solution of hydrogen peroxide and sodium dodecyl benzene sulfonate to form an aluminum-rich surface on the surface of the aluminum alloy matrix, hydrogen generated in the reaction process can promote non-soluble substances to leave the surface of the aluminum alloy matrix, so that the surface of the aluminum alloy matrix achieves a purification effect, crystals during the deposition of a coating are adsorbed on the surface of the aluminum alloy matrix by using the non-mutual-symmetrical force between the aluminum-rich surface and each molecule in the coating, and the concave-convex structure of the aluminum-rich surface can improve the crystal growth activity of the subsequent coating deposition, further improve the deposition speed of the coating and the binding force with the coating, thereby enhancing the strength of the aluminum alloy;

the method comprises the steps of carrying out primary plating on an aluminum alloy matrix subjected to alkaline etching treatment by using a mixed solution prepared from nickel sulfate, sodium hypophosphite, sodium acetate, malic acid and lactic acid to enable the plating to present a compact porous structure on the surface of the aluminum alloy matrix, modifying cerium oxide by stearic acid to obtain a secondary plating on the aluminum alloy matrix subjected to the primary plating, carrying out vacuum treatment simultaneously, enabling the modified cerium oxide to interact with aluminum atoms in a deposition process to convert a columnar crystalline structure of a cerium oxide coating into a compact and uniform superfine nanocrystalline structure, greatly reducing the tendency of the aluminum alloy matrix to be damaged by pitting corrosion, and improving the corrosion resistance of the material The coating surface is enabled to form a better film structure, the coating surface is enabled to be bright, hydroxyl in the coating can be reduced, partial hydroxide in the coating is dehydrated, the coating is in a hierarchical structure that the bottom layer is blocky and is combined with the upper layer nano-level spherical accumulation, so that the contact angle of the coating surface reaches super-hydrophobicity, when water drops drop on super-hydrophobic surface, water drops can form drops to roll off, and then dirt on the surface is taken away, and the self-cleaning effect is achieved;

and finally, carrying out electrochemical high-temperature high-pressure treatment on the aluminum alloy substrate of the secondary coating, wherein the high current density can accelerate the film forming speed of the coating, and simultaneously prolong the later growth time of the oxide film, electrons can puncture the original coating at the weak part of the coating to form an electronic channel, oxygen anions are combined with molten aluminum ions to thicken the oxide film, the high current density can accelerate the electron to puncture the coating, so that the growth of the coating is promoted, a compact coating grown in situ is generated, and the corrosion resistance and the high toughness of the aluminum alloy are improved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to more clearly illustrate the method provided by the present invention, the following examples are used to illustrate the method for testing each index of the corrosion-resistant high-temperature sensitive aluminum alloy manufactured in the following examples as follows:

high strength, the anti-breaking strength test is carried out on the corrosion-resistant high-temperature sensitive aluminum alloy prepared by the components of the example 1, the example 2 and the comparative example 1; the flexural strength of the corrosion-resistant high-temperature sensitive aluminum alloys prepared in example 1, example 2 and comparative example 1 was measured, respectively, and the higher the flexural strength, the better the high strength.

The corrosion resistance is that the corrosion resistance high temperature sensitive aluminum alloy prepared by the components of the embodiment 1, the embodiment 2 and the comparative example 2 is subjected to corrosion resistance test; the electrochemical test adopts a three-electrode system, a platinum electrode is an auxiliary electrode, a reference electrode is a saturated calomel electrode, a working electrode is a stainless steel sheet with the length of 2cm multiplied by 2cm, a corrosion medium is a sodium chloride solution with the mass fraction of 3.5%, the corrosion potential of the corrosion-resistant high-temperature sensitive aluminum alloy prepared by the components of the examples 1, 2 and 1 after being soaked in the sodium chloride solution with the mass fraction of 3.5% for 30min is measured, and the corrosion resistance is higher when the corrosion potential is more positive.

Example 1

The corrosion-resistant high-temperature sensitive aluminum alloy mainly comprises, by weight, 70 parts of an aluminum alloy matrix, 90 parts of a mixed solution 1, 20 parts of a mixed solution 2, 80 parts of a mixed solution 3 and 80 parts of modified cerium oxide.

The preparation method of the corrosion-resistant high-temperature sensitive aluminum alloy mainly comprises the following preparation steps:

(1) carrying out double-side polishing on the aluminum alloy substrate by using sand paper, and controlling the polishing direction and the polishing force; the number of the sand paper is 800#, the polishing direction is in the same direction, and the polishing force is 10N;

(2) carrying out surface treatment on the aluminum alloy matrix by using the mixed solution 1, and simultaneously cleaning by using ultrasonic waves; the mixed solution 1 is prepared by mixing sodium carbonate, sodium phosphate and sodium dodecyl benzene sulfonate according to the mass ratio of 10:10:1, the treatment temperature is 40 ℃, the treatment time is 5min, the ultrasonic time is 15min, and the ultrasonic frequency is 20 kHz;

(3) carrying out alkaline etching treatment on the cleaned aluminum alloy matrix by using the mixed solution 2; the mixed solution 2 is prepared by mixing perhydroxide and sodium dodecyl benzene sulfonate according to the mass ratio of 25:1, the alkali etching temperature is 40 ℃, and the alkali etching time is 8 s;

(4) carrying out primary plating on the aluminum alloy matrix subjected to the alkaline etching treatment by using the mixed solution 3; the mixed solution 3 is prepared by mixing nickel sulfate, sodium hypophosphite, sodium acetate, malic acid and lactic acid according to the mass ratio of 30:13:7:4:4, the thickness of a plating layer is 15 mu m, and the temperature of the plating layer is 30 ℃;

(5) carrying out vacuum treatment on the secondary coating of the aluminum alloy matrix after the primary coating by using the modified cerium oxide; the preparation method of the modified cerium oxide comprises the steps of drying cerium oxide powder at the temperature of 200 ℃, preparing a mixed solution of stearic acid and acetone according to the mass ratio of 1:2, adding cerium oxide which is 0.4 times of the mass of the mixed solution into the mixed solution, stirring and dispersing the mixture to be uniform, standing the mixture for 20min, filtering the mixture, washing the mixture for 1 time by water, and drying the mixture at the temperature of 100 ℃ to obtain the modified cerium oxide; the thickness of the plating layer is 15 mu m, and the temperature of the plating layer is 30 ℃;

(6) and electrifying the aluminum alloy matrix of the secondary coating and treating under the conditions of high temperature and high pressure to prepare the corrosion-resistant high-temperature sensitive aluminum alloy. The treatment temperature was 140 ℃, the treatment pressure was 200MPa, and the treatment voltage was 50 kV.

Example 2

The corrosion-resistant high-temperature sensitive aluminum alloy mainly comprises, by weight, 90 parts of an aluminum alloy matrix, 100 parts of a mixed solution 1, 30 parts of a mixed solution 2, 100 parts of a mixed solution 3 and 100 parts of modified cerium oxide.

The preparation method of the corrosion-resistant high-temperature sensitive aluminum alloy mainly comprises the following preparation steps:

(1) carrying out double-side polishing on the aluminum alloy substrate by using sand paper, and controlling the polishing direction and the polishing force; the number of the sand paper is 1000#, the grinding direction is in the same direction, and the grinding force is 20N;

(2) carrying out surface treatment on the aluminum alloy matrix by using the mixed solution 1, and simultaneously cleaning by using ultrasonic waves; the mixed solution 1 is prepared by mixing sodium carbonate, sodium phosphate and sodium dodecyl benzene sulfonate according to the mass ratio of 20:20:1, the treatment temperature is 50 ℃, the treatment time is 8min, the ultrasonic time is 20min, and the ultrasonic frequency is 40 kHz;

(3) carrying out alkaline etching treatment on the cleaned aluminum alloy matrix by using the mixed solution 2; the mixed solution 2 is prepared by mixing perhydroxide and sodium dodecyl benzene sulfonate according to the mass ratio of 35:2, the alkali etching temperature is 50 ℃, and the alkali etching time is 10 s;

(4) carrying out primary plating on the aluminum alloy matrix subjected to the alkaline etching treatment by using the mixed solution 3; the mixed solution 3 is prepared by mixing nickel sulfate, sodium hypophosphite, sodium acetate, malic acid and lactic acid according to the mass ratio of 50:21:7:4:4, the thickness of a plating layer is 25 mu m, and the temperature of the plating layer is 40 ℃;

(5) carrying out vacuum treatment on the secondary coating of the aluminum alloy matrix after the primary coating by using the modified cerium oxide; the preparation method of the modified cerium oxide comprises the steps of drying cerium oxide powder at 250 ℃, preparing a mixed solution of stearic acid and acetone according to the mass ratio of 1:3, adding cerium oxide of which the mass is 0.6 time that of the mixed solution into the mixed solution, stirring and dispersing the mixture to be uniform, standing the mixture for 30min, filtering the mixture, washing the mixture for 2 times by using water, and drying the mixture at 200 ℃ to obtain the modified cerium oxide; the thickness of the plating layer is 30 mu m, and the temperature of the plating layer is 40 ℃;

(6) and electrifying the aluminum alloy matrix of the secondary coating and treating under the conditions of high temperature and high pressure to prepare the corrosion-resistant high-temperature sensitive aluminum alloy. The treatment temperature is 150 ℃, the treatment pressure is 300MPa, and the treatment voltage is 60 kV.

Comparative example 1

The corrosion-resistant high-temperature sensitive aluminum alloy mainly comprises, by weight, 70 parts of an aluminum alloy matrix, 90 parts of a mixed solution 1, 80 parts of a mixed solution 3 and 80 parts of modified cerium oxide.

The preparation method of the corrosion-resistant high-temperature sensitive aluminum alloy mainly comprises the following preparation steps:

(1) carrying out double-side polishing on the aluminum alloy substrate by using sand paper, and controlling the polishing direction and the polishing force; the number of the sand paper is 800#, the polishing direction is in the same direction, and the polishing force is 10N;

(2) carrying out surface treatment on the aluminum alloy matrix by using the mixed solution 1, and simultaneously cleaning by using ultrasonic waves; the mixed solution 1 is prepared by mixing sodium carbonate, sodium phosphate and sodium dodecyl benzene sulfonate according to the mass ratio of 10:10:1, the treatment temperature is 40 ℃, the treatment time is 5min, the ultrasonic time is 15min, and the ultrasonic frequency is 20 kHz;

(3) carrying out primary plating on the aluminum alloy matrix subjected to the alkaline etching treatment by using the mixed solution 3; the mixed solution 3 is prepared by mixing nickel sulfate, sodium hypophosphite, sodium acetate, malic acid and lactic acid according to the mass ratio of 30:13:7:4:4, the thickness of a plating layer is 15 mu m, and the temperature of the plating layer is 30 ℃;

(4) carrying out vacuum treatment on the secondary coating of the aluminum alloy matrix after the primary coating by using the modified cerium oxide; the preparation method of the modified cerium oxide comprises the steps of drying cerium oxide powder at the temperature of 200 ℃, preparing a mixed solution of stearic acid and acetone according to the mass ratio of 1:2, adding cerium oxide which is 0.4 times of the mass of the mixed solution into the mixed solution, stirring and dispersing the mixture to be uniform, standing the mixture for 20min, filtering the mixture, washing the mixture for 1 time by water, and drying the mixture at the temperature of 100 ℃ to obtain the modified cerium oxide; the thickness of the plating layer is 15 mu m, and the temperature of the plating layer is 30 ℃;

(5) and electrifying the aluminum alloy matrix of the secondary coating and treating under the conditions of high temperature and high pressure to prepare the corrosion-resistant high-temperature sensitive aluminum alloy. The treatment temperature was 140 ℃, the treatment pressure was 200MPa, and the treatment voltage was 50 kV.

Comparative example 2

The corrosion-resistant high-temperature sensitive aluminum alloy mainly comprises, by weight, 70 parts of an aluminum alloy matrix, 90 parts of a mixed solution 1, 20 parts of a mixed solution 2 and 80 parts of a mixed solution 3.

The preparation method of the corrosion-resistant high-temperature sensitive aluminum alloy mainly comprises the following preparation steps:

(1) carrying out double-side polishing on the aluminum alloy substrate by using sand paper, and controlling the polishing direction and the polishing force; the number of the sand paper is 800#, the polishing direction is in the same direction, and the polishing force is 10N;

(2) carrying out surface treatment on the aluminum alloy matrix by using the mixed solution 1, and simultaneously cleaning by using ultrasonic waves; the mixed solution 1 is prepared by mixing sodium carbonate, sodium phosphate and sodium dodecyl benzene sulfonate according to the mass ratio of 10:10:1, the treatment temperature is 40 ℃, the treatment time is 5min, the ultrasonic time is 15min, and the ultrasonic frequency is 20 kHz;

(3) carrying out alkaline etching treatment on the cleaned aluminum alloy matrix by using the mixed solution 2; the mixed solution 2 is prepared by mixing perhydroxide and sodium dodecyl benzene sulfonate according to the mass ratio of 25:1, the alkali etching temperature is 40 ℃, and the alkali etching time is 8 s;

(4) carrying out primary plating on the aluminum alloy matrix subjected to the alkaline etching treatment by using the mixed solution 3; the mixed solution 3 is prepared by mixing nickel sulfate, sodium hypophosphite, sodium acetate, malic acid and lactic acid according to the mass ratio of 30:13:7:4:4, the thickness of a 0 coating is 15 mu m, and the temperature of the coating is 30 ℃;

(5) and electrifying the aluminum alloy matrix of the secondary coating and treating under the conditions of high temperature and high pressure to prepare the corrosion-resistant high-temperature sensitive aluminum alloy. The treatment temperature was 140 ℃, the treatment pressure was 200MPa, and the treatment voltage was 50 kV.

Effect example 1

Table 1 below gives the results of the high strength performance tests using examples 1, 2 and comparative example 1 according to the present invention.

TABLE 1

	Flexural strength (MPa)
		Example 1	435
Example 2	440
		Comparative example 1	166

As can be seen from the above table, the high strength of examples 1 and 2 is better, and the comparative example is poorer, which shows that the mixed solution of hydrogen peroxide and sodium dodecylbenzenesulfonate is subjected to alkaline etching treatment on the aluminum alloy substrate to form an aluminum-rich surface on the surface of the aluminum alloy substrate, crystals during the deposition of the plating layer are adsorbed on the surface of the aluminum alloy substrate by the non-mutual force between the aluminum-rich surface and each molecule in the plating layer, and the concave-convex structure of the aluminum-rich surface can improve the crystal growth activity of the subsequent plating layer deposition, further improve the deposition rate of the plating layer, and improve the bonding force with the plating layer, thereby enhancing the strength of the aluminum alloy.

Effect example 2

Table 2 below gives the results of the corrosion resistance performance tests using examples 1, 2 and 2 of the present invention.

TABLE 2

As can be seen from the above table, the corrosion resistance of the examples 1 and 2 is high, and the corrosion resistance of the comparative example 2 is poor, which illustrates that the secondary plating layer of the aluminum alloy substrate after the primary plating layer is modified by using stearic acid, and simultaneously, vacuum treatment is performed, so that the modified cerium oxide can interact with aluminum atoms in the deposition process, so that the columnar crystalline structure of the cerium oxide coating is changed into a dense and uniform ultrafine nanocrystalline structure, and the tendency of pitting failure of the aluminum alloy substrate is greatly reduced, thereby improving the corrosion resistance of the material, and during vacuum treatment, the deposition of nickel atoms formed by the primary plating layer on the aluminum alloy substrate can enable the cerium oxide in the secondary plating layer to be adsorbed, and the interaction of the two enables the plating layer to form a better dense structure and corrosion resistance.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.