CN113773749A - Corrosion-resistant treating agent for metal goods shelf and corrosion-resistant treatment process for metal goods shelf - Google Patents

Abstract

The application relates to the technical field of metal product surface treatment, and particularly discloses a corrosion-resistant treating agent for a metal shelf and a corrosion-resistant treatment process for the metal shelf. The corrosion-resistant treating agent comprises a part A and a part B, wherein the part A is composed of the following raw materials in parts by weight: 10-20 parts of coordination type silane coupling agent, 30-50 parts of non-coordination type silane coupling agent and 6-10 parts of retarder, wherein the part B comprises the following raw materials in parts by weight: 100 portions of aqueous solvent, 140 portions of metal particles and 12 to 16 portions of metal particles, wherein the weight ratio of the part A to the part B is 1: (1.3-1.7). The utility model provides a coordination type silane coupling agent, non-coordination type silane coupling agent, retarder and metal particle have the synergism, have not only formed the hydrophobic layer on metal goods shelves surface, have improved metal goods shelves's water-proof effects, can also improve the thickness of hydrophobic layer, improve the wear resistance of hydrophobic layer simultaneously.

Description

Corrosion-resistant treating agent for metal goods shelf and corrosion-resistant treatment process for metal goods shelf

Technical Field

The application relates to the technical field of metal product surface treatment, in particular to a corrosion-resistant treating agent for a metal shelf and a corrosion-resistant treatment process for the metal shelf.

Background

The phenomenon of corrosion is the leading cause of the degradation of the properties of metal articles, causing huge economic losses worldwide each year. The traditional metal product anticorrosion method is to use phosphating solution to carry out surface treatment on a metal product, and in recent years, the treatment process of the phosphating solution is gradually replaced by a more environment-friendly silane coupling agent treatment process due to too serious environmental pollution caused by the phosphating solution.

In the related art, a metal shelf anticorrosion treatment process comprises the following steps: (1) degreasing the surface of the metal shelf, and removing stains and rusts; (2) mixing a silane coupling agent and deionized water according to the ratio of 1: (1.2-1.6) to obtain an antiseptic treatment solution; (3) soaking the metal shelf in the antiseptic treatment solution for 8-15min, pulling and taking out, standing the metal shelf for 4-8min after taking out, and drying the surface of the metal shelf; (4) and (4) repeating the step (3) for 7-15 times, and then cleaning and drying the metal shelf to finish the anti-corrosion treatment of the metal shelf. The surface of the metal shelf is treated for a plurality of times by using the silane coupling agent, so that the thickness of the hydrophobic layer on the surface of the metal shelf is increased.

In view of the above related art, the inventor believes that, although the thickness of the hydrophobic layer is increased by spraying for multiple times in the related art, after the antiseptic treatment liquid close to the surface of the metal shelf is cured, the surface property of the metal shelf is changed from hydrophilicity to hydrophobicity, which affects the adhesion effect of the remaining antiseptic treatment liquid on the surface of the metal shelf, and thus the wear resistance of the hydrophobic layer is easily poor.

Disclosure of Invention

In the related art, the solidified anticorrosion treatment liquid can affect the adhesion effect of the residual anticorrosion treatment liquid on the surface of the metal shelf, and the wear resistance of the hydrophobic layer is easily poor. In order to overcome the defect, the application provides an anti-corrosion treatment agent for the metal shelf and an anti-corrosion treatment process for the metal shelf.

In a first aspect, the application provides a corrosion-resistant treating agent for a metal shelf, which adopts the following technical scheme:

the corrosion-resistant treating agent for the metal shelf comprises an A part and a B part, and comprises the A part and the B part, wherein the A part is composed of the following raw materials in parts by weight: 10-20 parts of coordination type silane coupling agent, 30-50 parts of non-coordination type silane coupling agent and 6-10 parts of retarder, wherein the part B comprises the following raw materials in parts by weight: 100 portions of aqueous solvent, 140 portions of metal particles and 12 to 16 portions of metal particles, wherein the weight ratio of the part A to the part B is 1: (1.3-1.7).

By adopting the technical scheme, in the application, after the part A and the part B are mixed, the coordination type silane coupling agent and the non-coordination type silane coupling agent are hydrolyzed, silanol groups are generated, and the retarder inhibits the activity of the silanol groups. After the mixed solution of the part A and the part B contacts the surface of the metal shelf, the coordination type silane coupling agent and the metal on the surface of the shelf form a chelate, the chelate forms an anticorrosion base layer, and a silanol group in the anticorrosion base layer extends towards the direction far away from the surface of the metal shelf.

After the anti-corrosion base layer is formed, the remaining coordination type silane coupling agent is chelated with the metal particles, and silanol groups are introduced to the surfaces of the metal particles. With the evaporation of water in the aqueous solvent, the inhibiting effect of the retarder on the activity of silanol groups is reduced, the activity of the silanol groups is gradually recovered, condensation polymerization occurs between molecules of the coordination type silane coupling agent and molecules of the non-coordination type silane coupling agent, and a network silica structure is gradually formed by taking metal particles as cores. After the water is completely evaporated, the reticular silica structure and the anticorrosion base layer are combined into a hydrophobic film.

Compared with the prior art, in the hydrophobic film, the metal particles, the coordination type silane coupling agent and the non-coordination type silane coupling agent play a synergistic role, and the formed reticular silica structure increases the thickness of the hydrophobic film and improves the corrosion resistance of the metal shelf; when the thickness of the hydrophobic film is increased, the retarder coordination type silane coupling agent and the non-coordination type silane coupling agent exert a synergistic effect, the orientation of a silanol group in the coordination type silane coupling agent is changed, one side, far away from the surface of the metal shelf, of the anticorrosion base layer keeps hydrophilic, the combination degree of the anticorrosion base layer and the net-shaped silica structure is improved, and the wear resistance of the hydrophobic film is improved.

Preferably, the part A consists of the following raw materials in parts by weight: 13-18 parts of coordination type silane coupling agent, 35-45 parts of non-coordination type silane coupling agent and 7-9 parts of retarder, wherein the part B comprises the following raw materials in parts by weight: 130 parts of aqueous solvent 110 and 13-15 parts of metal particles.

By adopting the technical scheme, the raw material ratio of the part A and the part B is optimized, and the wear resistance of the hydrophobic membrane is improved.

Preferably, the coordination type silane coupling agent is one of (3-aminopropyl) dimethylethoxysilane and gamma-aminopropyltriethoxysilane, and the non-coordination type silane coupling agent is one of ethyl orthosilicate and methyl orthosilicate.

By adopting the technical scheme, nitrogen atoms in the (3-aminopropyl) dimethylethoxysilane and the gamma-aminopropyltriethoxysilane can form coordinate bonds with metals, thereby being beneficial to improving the wear resistance of the hydrophobic membrane. Both tetraethoxysilane and tetraethoxysilane are not easy to form a coordinate bond with a metal, and therefore, both of them can be used as an uncoordinated silane coupling agent.

Preferably, the retarder is one of glycerin and polyvinyl alcohol.

By adopting the technical scheme, glycerol and polyvinyl alcohol both contain a large amount of hydroxyl, and the hydroxyl can generate hydrogen bonds with silanol groups, so that the polycondensation reaction of the silanol groups is inhibited, and the retarding effect is achieved. The molecular weight of the glycerol is far smaller than that of the polyvinyl alcohol, so that the glycerol is easy to migrate to the surface of the hydrophobic membrane along with the evaporation of water in the aqueous solvent, is not easy to remain in the hydrophobic membrane, reduces the possibility of influencing the density of the hydrophobic membrane, and is beneficial to improving the wear resistance of the hydrophobic membrane.

Preferably, the metal particles are selected from nano iron powder or nano aluminum powder.

By adopting the technical scheme, the nanometer iron powder and the nanometer aluminum powder can form coordination bonds with the coordination type silane coupling agent. The iron ions generated after the surface of the nano iron powder is oxidized can be combined with the fracture of the silicon-oxygen bond, and a ferrite tetrahedron structure is formed at the fracture, so that the hydrophobic film is repaired, and the wear-resisting property of the hydrophobic film is improved.

Preferably, the part A also comprises 2-6 parts of a drying agent, and the drying agent is anhydrous gypsum.

By adopting the above technical scheme, in the process of storing the part A, the anhydrous gypsum absorbs the moisture mixed in the part A, thereby inhibiting the hydrolysis of the coordination type silane coupling agent and the non-coordination type silane coupling agent. When handling metal goods shelves, anhydrous gypsum absorbs the moisture in the aqueous solvent, and the anhydrous gypsum can take place the inflation after absorbing water, and the shrinkage stress that produces when the shrinkage of hydrophobic membrane can be offset to the expansion stress that the anhydrous gypsum inflation produced, and the void that produces when the shrinkage of hydrophobic membrane can also be filled to anhydrous gypsum to the possibility of defect appears in the structure that has reduced hydrophobic membrane, helps improving the wear resistance of hydrophobic membrane.

Preferably, the aqueous solvent is prepared from ethanol and silica sol according to a ratio of 1: (1.2-1.4) in a mass ratio.

By adopting the technical scheme, the ethanol has stronger volatility, and can carry water in the silica sol to separate when the ethanol volatilizes, thereby being beneficial to accelerating the forming speed of the hydrophobic membrane. In addition, when the silica sol is dehydrated, nano silica particles in the silica sol are deposited on the surface of the hydrophobic membrane, and the defects on the surface of the hydrophobic membrane are repaired, so that the wear resistance of the hydrophobic membrane is improved.

Preferably, the silica sol has a water content of 68 to 74%.

By adopting the technical scheme, when the water content of the silica sol is too high, the retarder is too dispersed, the inhibiting effect of the retarder on silanol groups is insufficient, competitive adsorption of coordination type silane coupling and non-coordination type silane coupling agents on the surface of a metal shelf is easily caused, and the forming effect of a hydrophobic film is influenced. When the water content of the silica sol is too low, the nano silicon dioxide particles are easy to agglomerate, and the combination effect between the hydrophobic film and the nano silicon dioxide particles is influenced. When the water content of the silica sol is 68-74%, the hydrophobic film has good forming effect and high wear resistance.

Preferably, the metal fine particles have an average particle diameter of 30 to 50 nm.

By adopting the technical scheme, when the average particle size of the metal particles is too small, the reinforcing effect of the metal particles on the hydrophobic membrane is limited, and when the average particle size of the metal particles is too large, the number of binding sites provided by the metal particles for the coordination type silane coupling agent is insufficient. When the average particle size of the metal particles is 30-50nm, the metal particles have good reinforcing effect, the number of the binding sites improved for the coordination type silane coupling agent is large, and the wear resistance of the hydrophobic film is high.

In a second aspect, the present application provides a metal shelf corrosion-resistant treatment process using the above corrosion-resistant treatment agent for metal shelves, which adopts the following technical scheme.

The metal shelf anticorrosion treatment process comprises the following steps:

(1) mixing the part A and the part B and uniformly stirring to obtain a corrosion-resistant treating agent for later use;

(2) polishing and cleaning the surface of the metal shelf to remove rust and dust on the surface of the metal shelf;

(3) soaking the metal shelf in the modification liquid for 8-15min, pulling and taking out, standing the metal shelf for 4-8min after taking out, and drying the surface of the metal shelf;

(4) and (4) repeating the step (3) for 7-15 times, then cleaning the surface of the metal shelf, and finishing the anticorrosion treatment of the metal shelf after the metal shelf is naturally dried.

Through adopting above-mentioned technical scheme, when using, mix part A and part B earlier, use mixed liquid again and spray metal goods shelves, then accelerate the shaping of hydrophobic membrane through the mode of drying. After multiple spraying and drying, a hydrophobic film is finally formed on the surface of the metal shelf. The hydrophobic film isolates external corrosive substances, and the corrosion prevention effect of the metal goods shelf is improved.

In summary, the present application has the following beneficial effects:

1. in the application, the coordination type silane coupling agent firstly generates an anticorrosion base layer on the surface of the metal shelf, then the coordination type silane coupling agent, the non-coordination type silane coupling agent and the metal particles jointly form a net-shaped silica structure, the net-shaped silica structure is combined with the anticorrosion base layer, and the thickness of the hydrophobic film is increased. On the basis of increasing the thickness of the hydrophobic film, the retarder changes the orientation of the silanol group in the coordination silane coupling agent, so that the side of the anticorrosion base layer, which is far away from the surface of the metal shelf, keeps hydrophilic, the combination degree of the anticorrosion base layer and the reticular silica structure is improved, and the wear resistance of the hydrophobic film is improved.

2. In the present application, anhydrous gypsum is preferable as a desiccant, and the anhydrous gypsum can absorb moisture in an aqueous solvent and swell when a metal shelf is subjected to a preservative treatment, in addition to absorbing moisture in part a. The expansion stress generated when the anhydrous gypsum expands can offset the contraction stress generated when the hydrophobic membrane is formed, thereby being beneficial to reducing the possibility of the structural defects of the hydrophobic membrane and improving the wear resistance of the hydrophobic membrane

3. According to the method, the method of firstly spraying and then drying is used, after the metal goods shelf is sprayed and dried for multiple times, the hydrophobic film is prepared on the surface of the metal goods shelf, and can isolate corrosive substances, so that the method is beneficial to improving the wear resistance of the hydrophobic film and improving the corrosion prevention effect of the metal goods shelf.

Detailed Description

The present application will be described in further detail with reference to examples.

Examples

The raw materials used in the examples of the present application are all commercially available, wherein the polyvinyl alcohol is a technical grade polyvinyl alcohol (molecular weight 14 ten thousand).

Examples 1 to 5

The following description will be given by taking example 1 as an example.

Example 1

In this embodiment, the metal shelf is a metal shelf of a large-scale logistics warehouse shelf provided by Ningbo new optical shelf Co., Ltd, and the shelf is made of cold-rolled steel. The corrosion-resistant treatment agent is formed by mixing part A and part B according to the weight ratio of 1:1.3, wherein part A comprises 10kg of coordination type silane coupling agent, 30kg of non-coordination type silane coupling agent and 6kg of retarder, the coordination type silane coupling agent is gamma-aminopropyltriethoxysilane, the non-coordination type silane coupling agent is ethyl orthosilicate, and the retarder is polyvinyl alcohol. The part B comprises 100kg of aqueous solvent and 12kg of metal particles, the aqueous solvent is deionized water, the metal particles are nano aluminum powder, and the average particle size of the nano aluminum powder is 20 nm.

The metal shelf anticorrosion treatment process in the embodiment comprises the following steps:

(1) mixing the part A and the part B and uniformly stirring to obtain a corrosion-resistant treating agent for later use;

(2) polishing and cleaning the surface of the metal shelf to remove rust and dust on the surface of the metal shelf;

(3) soaking the metal shelf in the modification liquid for 10min, pulling and taking out, standing the metal shelf for 6min after taking out, and drying the surface of the metal shelf;

(4) and (4) repeating the step (3) for 10 times, then cleaning the surface of the metal shelf, and finishing the anticorrosion treatment of the metal shelf after the metal shelf is naturally dried.

As shown in Table 1, examples 1 to 5 differ mainly in the ratio of raw materials

TABLE 1

Example 6

This example is different from example 3 in that (3-aminopropyl) dimethylethoxysilane is used as a coordinate type silane coupling agent.

Example 7

This example is different from example 6 in that methyl orthosilicate is used as the non-coordinating silane coupling agent.

Example 8

This example differs from example 7 in that the retarder was glycerol.

Example 9

The difference between this embodiment and embodiment 8 is that the metal particles are made of nano iron powder.

Example 10

This example differs from example 9 in that part a also includes 2kg of a desiccant, which is anhydrous gypsum.

As shown in Table 2, examples 10 to 14 differ in the amount of anhydrite.

TABLE 2

Sample(s)	Example 10	Example 11	Example 12	Example 13	Example 14
						Anhydrous gypsum/kg	10	13	15	18	20

As shown in Table 3, examples 12 and 15 to 18 are different in the mass ratio of ethanol to silica sol in the aqueous solvent.

Sample(s)	Example 12	Example 15	Example 16	Example 17	Example 18
						Ethanol: silica sol	1:1.1	1：1.2	1:1.3	1:1.4	1:1.5

Example 19

The difference between the embodiment and the embodiment 16 is that the aqueous solvent is prepared by compounding ethanol and silica sol according to the mass ratio of 1:1.1, wherein the water content of the silica sol is 64%.

As shown in Table 4, examples 19 to 23 differ in the mass ratio of ethanol to silica sol in the aqueous solvent.

TABLE 4

Sample(s)	Example 19	Example 20	Example 21	Example 22	Example 23
						Ethanol: silica sol	1:1.1	1：1.2	1:1.3	1:1.4	1:1.5

As shown in Table 5, example 21 is different from examples 24 to 27 in the water content of the silica sol.

TABLE 5

As shown in Table 6, example 25 is different from examples 28 to 31 in the average particle diameter of the metal fine particles.

TABLE 6

Comparative example

Comparative example 1

The metal shelf anticorrosion treatment process comprises the following steps:

(1) degreasing the surface of the metal shelf, and removing stains and rusts;

(2) mixing a silane coupling agent and deionized water according to the ratio of 1: 1.4 to obtain an antiseptic treatment liquid;

(3) spraying the antiseptic treatment liquid on the surface of the metal shelf, and drying the surface of the metal shelf after 4 min;

(4) and (4) repeating the step (3) for 10 times, and then cleaning and drying the metal shelf to finish the anticorrosion treatment of the metal shelf.

Comparative example 2

This comparative example differs from example 3 in that the gamma-aminopropyltriethoxysilane in part a is replaced with the same weight of ethyl orthosilicate.

Comparative example 3

This comparative example differs from example 3 in that the ethyl orthosilicate in part a is replaced with the same weight of gamma-aminopropyltriethoxysilane.

Comparative example 4

This comparative example differs from example 3 in that no retarder was included in the components of part a.

Comparative example 5

This comparative example differs from example 3 in that the component of part B does not include metal fine particles.

Performance detection test method

The wear resistance of the metal shelf subjected to the anti-corrosion treatment is evaluated by using an MMG-10 type end face friction wear testing machine, the shape of an upper friction pair used in the test is annular, the upper friction pair is made of annealed 40Cr steel, and the size of the upper friction pair is as follows:

28mm outside diameter, 22mm inside diameter, and 12mm height. The lower friction pair is disc-shaped, and the size of the lower friction pair is as follows:

the lower friction pair is obtained by cutting a shelf of the metal goods shelf, and after the cutting is finished, the lower friction pair is subjected to the same anticorrosion treatment as the metal goods shelf. During detection, 100N load is applied to the upper friction pair, the upper friction pair rotates relative to the lower friction pair at the rotating speed of 120r/min, the mass loss rate of the lower friction pair is calculated according to the following formula after 1 hour of rotation, and the calculation result is shown in Table 7.

TABLE 7

Sample(s)	Mass loss rate/% o	Sample(s)	Mass loss rate/% o
				Example 1	4.42	Example 19	2.89
Example 2	4.39	Example 20	2.85
				Example 3	436	Example 21	2.81
Example 4	4.40	Example 22	2.84
				Example 5	4.43	Example 23	2.90
Example 6	4.14	Example 24	2.64
				Example 7	4.15	Example 25	2.51
Example 8	3.98	Example 26	2.62
				Example 9	3.76	Example 27	2.71
Example 10	3.39	Example 28	2.34
				Example 11	3.33	Example 29	2.15
Example 12	3.27	Example 30	2.26
				Example 13	3.30	Example 31	2.37
Example 14	3.34	Comparative example 1	18.45
				Example 15	3.19	Comparative example 2	8.94
Example 16	3.13	Comparative example 3	9.42
				Example 17	3.17	Comparative example 4	14.58
Example 18	3.24	Comparative example 5	13.94

As can be seen by combining examples 1-5 and comparative example 1 with Table 7, the mass loss rates measured in examples 1-5 are all lower than in comparative example 1, indicating that the hydrophobic films of examples 1-5 have the best abrasion resistance in examples 1-5 and the hydrophobic film of example 3 has the best abrasion resistance.

It can be seen from the combination of example 3 and comparative examples 2 to 5 and table 7 that the mass loss rates measured in comparative examples 2 to 5 are all higher than those in example 3, indicating that the combination of the coordination type silane coupling agent, the non-coordination type silane coupling agent, the metal fine particles and the retarder is more helpful to improve the wear resistance of the hydrophobic film.

Combining example 3 and example 6 with table 7, it can be seen that the mass loss rate measured in example 6 is lower than in example 3, indicating that (3-aminopropyl) dimethylethoxysilane contributes more to the improvement of the abrasion resistance of the hydrophobic film than gamma-aminopropyltriethoxysilane.

Combining example 8 and example 7 with table 7, it can be seen that the mass loss rate measured in example 8 is close to that of example 7, indicating that the effects of methyl orthosilicate and methyl orthosilicate on improving the wear resistance of the hydrophobic film are close.

Combining example 8 and example 7, and table 7, it can be seen that the mass loss rate measured for example 8 is lower than for example 7, indicating that glycerol is more conducive to improving the abrasion resistance of the hydrophobic film than polyvinyl alcohol.

Combining example 9 and example 8 and table 7, it can be seen that the mass loss rate measured in example 9 is lower than that in example 8, indicating that nano iron powder is more helpful to improve the wear resistance of the hydrophobic film than nano aluminum powder.

As can be seen by combining example 9, examples 10-14 and Table 7, the mass loss rates measured in examples 10-14 are all lower than in example 8, indicating that the anhydrite contributes to the improvement of the abrasion resistance of the hydrophobic film. In examples 10 to 14, the hydrophobic film of example 12 is most effective in abrasion resistance.

When the mass ratio of ethanol to silica sol in the aqueous solvent is 1: (1.2-1.4), the hydrophobic film has good wear-resisting effect.

As can be seen by combining example 16, examples 19 to 23 and Table 7, the mass loss rates measured in examples 19 to 23 are all lower than those in example 16, which shows that the compound product of ethanol and silica sol is more beneficial to improving the wear resistance of the hydrophobic film compared with deionized water. In examples 19 to 23, the hydrophobic film of example 21 is the most excellent in abrasion resistance.

When the water content of the silica sol was 68 to 74%, the abrasion resistance of the hydrophobic film was good, as can be seen by combining examples 21 and 24 to 27 with table 7.

When the average particle diameter of the metal fine particles is 30 to 50nm, the abrasion resistance of the hydrophobic film is good as shown in Table 7 in combination with examples 25 and 28 to 31.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (10)

1. The corrosion-resistant treating agent for the metal shelf is characterized by comprising a part A and a part B, wherein the part A is prepared from the following raw materials in parts by weight: 10-20 parts of coordination type silane coupling agent, 30-50 parts of non-coordination type silane coupling agent and 6-10 parts of retarder, wherein the part B comprises the following raw materials in parts by weight: 100 portions of aqueous solvent, 140 portions of metal particles and 12 to 16 portions of metal particles, wherein the weight ratio of the part A to the part B is 1: (1.3-1.7).

2. The corrosion-resistant treating agent for metal goods shelves according to claim 1, wherein the part A is composed of the following raw materials in parts by weight: 13-18 parts of coordination type silane coupling agent, 35-45 parts of non-coordination type silane coupling agent and 7-9 parts of retarder, wherein the part B comprises the following raw materials in parts by weight: 130 parts of aqueous solvent 110 and 13-15 parts of metal particles.

3. The corrosion-resistant treating agent for metal shelf according to claim 1, wherein said silane coupling agent of coordination type is one of (3-aminopropyl) dimethylethoxysilane and γ -aminopropyltriethoxysilane, and said silane coupling agent of non-coordination type is one of tetraethyl orthosilicate and methyl orthosilicate.

4. The corrosion-resistant treating agent for metal goods shelves according to claim 1, wherein the retarder is one of glycerin and polyvinyl alcohol.

5. The corrosion-resistant treating agent for metal shelf according to claim 1, wherein the metal fine particles are selected from nano iron powder or nano aluminum powder.

6. The corrosion-resistant treating agent for metal shelf according to claim 1, wherein the part A further comprises 2-6 parts of a drying agent, and the drying agent is anhydrous gypsum.

7. The corrosion-resistant treating agent for metal shelf according to claim 1, wherein the aqueous solvent is prepared from ethanol and silica sol in a ratio of 1: (1.2-1.4) in a mass ratio.

8. The corrosion-resistant treatment agent for metal shelving as claimed in claim 7, wherein the silica sol has a water content of 68-74%.

9. The corrosion-resistant treatment agent for metal goods shelves according to claim 1, wherein the metal fine particles have an average particle diameter of 30 to 50 nm.

10. A process for corrosion prevention treatment of a metal shelf using the corrosion resistance treatment agent for a metal shelf according to any one of claims 1 to 9, comprising the steps of:

(1) mixing the part A and the part B and uniformly stirring to obtain a corrosion-resistant treating agent for later use;

(2) polishing and cleaning the surface of the metal shelf to remove rust and dust on the surface of the metal shelf;

(3) soaking the metal shelf in the modification liquid for 8-15min, pulling and taking out, standing the metal shelf for 4-8min after taking out, and drying the surface of the metal shelf;

(4) and (4) repeating the step (3) for 7-15 times, then cleaning the surface of the metal shelf, and finishing the anticorrosion treatment of the metal shelf after the metal shelf is naturally dried.