CN110158075B

CN110158075B - Paster for surface treatment of austenitic stainless steel workpiece and use method thereof

Info

Publication number: CN110158075B
Application number: CN201910385132.3A
Authority: CN
Inventors: 孙晓光; 韩晓辉; 任佩云; 赵延强; 叶结和
Original assignee: CRRC Qingdao Sifang Co Ltd
Current assignee: CRRC Qingdao Sifang Co Ltd
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2021-02-09
Anticipated expiration: 2039-05-09
Also published as: CN110158075A

Abstract

The invention relates to a patch for surface treatment of an austenitic stainless steel workpiece and a using method thereof. The patch for surface treatment of an austenitic workpiece comprises: a first patch, a second patch, and a third patch; the first patch, the second patch and the third patch are substrates with gel layers; wherein: the gel layer of the first patch contains a cleaning agent; the gel layer of the second patch contains a passivating agent; the gel layer of the third patch contains a sealer. According to the invention, the anticorrosive surface treatment of the large-size and special-shaped austenite workpiece is realized by adopting a combination mode of three patches containing different treating agents, so that the condition that the treating agents flow and disperse in the traditional method is avoided; under the cooperation of the three treating agents, the corrosion prevention treatment effect of the austenite workpiece is obviously improved.

Description

Paster for surface treatment of austenitic stainless steel workpiece and use method thereof

Technical Field

The invention belongs to the technical field of material atmospheric corrosion research, and particularly relates to a patch for surface treatment of an austenitic stainless steel workpiece and a using method thereof.

Background

The corrosion problem of metal materials and workpieces thereof is spread in various fields of national economy, and the loss caused by the corrosion problem accounts for more than 50 percent of the annual loss of the metal, and besides great economic loss, a plurality of catastrophic accidents can be caused. Therefore, the method has great significance for carrying out anticorrosion protection treatment on metal materials and workpieces thereof.

The prior anticorrosion protection measures are various, wherein the passivation protection plays a significant role, cleaning treatment is often carried out before passivation treatment, and sealing treatment is carried out after passivation treatment.

Passivation agents (mainly oxidants) are commonly used in industry to passivate metals to form a protective film. Compared with the traditional physical sealing method, the method has the characteristics of not increasing the thickness of the workpiece and changing the color after passivation treatment, improves the precision and the added value of the product and ensures that the operation is more convenient; secondly, passivation promotes the oxygen molecular structure passivation film and the film layer formed on the metal surface to be compact and stable in performance, and has a self-repairing function in air, so that compared with the traditional method for coating anti-rust oil, the passivation film formed by passivation is more stable and more corrosion-resistant.

During actual passivation treatment of a workpiece, the surface of the workpiece needs to be cleaned due to the fact that pollutants such as grease affect passivation treatment effects, pickling passivation treatment is carried out after cleaning, post-treatment such as sealing is carried out after pickling, and damage to passivation protection effects caused by contact between dissimilar metals and non-metals is avoided.

In industrial production, after some austenitic stainless steel materials or workpieces are formed or processed, the traditional chemical treatment technology cannot meet the requirements of actual working conditions, for example, for the passivation treatment of welding spots of larger workpieces, on one hand, the establishment of a large-scale treatment tank greatly increases the production cost, influences the production efficiency and does not meet the actual requirements; on the other hand, because of the fluidity of the relevant agent, it is not guaranteed that the relevant agent is pooled to the site to be treated.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

In order to overcome the technical problems, the invention provides a patch for surface treatment of an austenitic workpiece and a using method thereof. The combined mode of three patches containing different treating agents is adopted to realize the anticorrosion surface treatment of the large-size and special-shaped austenite workpiece, so that the condition that the treating agents flow and disperse in the traditional method is avoided; under the cooperation of the three treating agents, the corrosion prevention treatment effect of the austenite workpiece is obviously improved. The patch and the use method thereof have important significance for actual industrial production.

The technical scheme of the invention is as follows:

a patch for surface treatment of an austenitic workpiece, comprising: a first patch, a second patch, and a third patch; the first patch, the second patch and the third patch respectively comprise a substrate and a gel layer attached to one side of the substrate; wherein:

the gel layer of the first patch contains a cleaning agent;

the gel layer of the second patch contains a passivating agent;

the gel layer of the third patch contains a sealer.

The substrate can be made of one or more of a hot-rolled non-woven fabric, a spunlace non-woven fabric and a heat-seal non-woven fabric. The non-woven fabric material can ensure that the patch is better pasted on the surface of a workpiece to be treated, and the situations of displacement, volatilization or uneven distribution of a treating agent and the like are prevented.

The size of the substrate can be selected according to the area of the part to be processed of the workpiece, and is usually expanded by 5-8cm on the basis of the area of the part to be processed; for example, the area of the portion to be processed of the workpiece is 5cm long and 2cm wide, and the size of the substrate is selected to be 13cm long and 9.5cm wide. In addition, considering the influence of the air drying of the treating agent and the like on the treating effect, the thickness of the substrate is preferably 1 to 5 mm.

The material of the gel layer can be selected from gel materials commonly used in the field. However, in consideration of the adsorbability of the gel layer to each treatment agent, the degree of dispersion of each treatment agent in the gel layer, the permeability of each treatment agent during the treatment, and the adhesion property between the patch and the workpiece, the material of the gel layer is preferably one or more of starch-based hydrogel, cellulose-based hydrogel, alginic-based hydrogel, and chitosan-based hydrogel; and the thickness of the gel layer is preferably 1-3 mm; the porosity of the gel layer reaches more than 90%.

Under the condition, the efficacy of each treating agent can be exerted to the maximum extent, and the treatment effect is obviously improved.

The size of the gel layer can be selected according to the area of the part to be processed of the workpiece, can be completely matched with the size of the patch, and can also be enlarged by 3-5cm on the basis of the area of the part to be processed; the specific shape can be round, square, etc.

In the present invention, the formulation of each treating agent and its mass fraction in the gel layer are also important for the final treatment effect.

The addition amount of the cleaning agent is not less than 50% of the total mass of the gel layer in the first patch.

The cleaning agent is selected from one of gluconate and trisodium phosphate; preferably a gluconate salt, and more preferably potassium gluconate or sodium gluconate.

The passivator comprises the following components in parts by weight: 20-30 parts of hydrogen peroxide, 2-4 parts of citric acid and 3-4 parts of hexamethylenetetramine; preferably, the passivator comprises the following components in parts by weight: 30 parts of hydrogen peroxide, 3 parts of citric acid and 3 parts of hexamethylenetetramine.

The addition amount of the passivating agent is not less than 50% of the total mass of the gel layer in the second patch.

The sealant comprises the following components in parts by weight: 10-15 parts of phytic acid, 2-5 parts of phosphate, 1-5 parts of imidazolidinone, 1-5 parts of pyrazinamide, 5-10 parts of adipic acid, 0.1-2 parts of sodium dodecyl sulfate, 10-15 parts of malic acid, 10-15 parts of tannic acid and 5-8 parts of triethylamine.

Preferably, the sealant comprises the following components in parts by weight: 12 parts of phytic acid, 3 parts of phosphate, 3 parts of imidazolidinone, 2 parts of pyrazinamide, 8 parts of adipic acid, 0.15 part of sodium dodecyl sulfate, 12 parts of malic acid, 12 parts of tannic acid and 7 parts of triethylamine.

The addition amount of the sealant is not less than 50% of the total mass of the gel layer in the third patch.

Experiments show that under the condition of the gel layer, the treating agents can be better dispersed in the respective gel layer and fully seep out when the workpiece is treated, so that the effect is exerted, and the treatment effect of the workpiece to be treated is obviously improved.

The invention also provides a preparation method of the patch, which comprises the following steps: according to the proportion, respectively diluting a cleaning agent, a passivating agent and a sealing agent to aqueous solutions with certain concentrations, respectively soaking three substrates with gel layers in the aqueous solutions of the cleaning agent, the passivating agent and the sealing agent, and respectively obtaining a first patch, a second patch and a third patch after the aqueous solutions are absorbed;

wherein the concentration of the aqueous solution of the cleaning agent is 20-30 wt%, preferably 25 wt%;

the concentration of the passivating agent aqueous solution is 25-38 wt%, and preferably 36 wt%;

the concentration of the aqueous solution of the blocking agent is 30-80 wt%, preferably 59-60 wt%;

as a specific embodiment of the present invention, in preparing a patch, the formulation of the aqueous solution of the cleaning agent is: 20-30 wt% of gluconate; 70-80 wt% of deionized water; preferably, 24-26 wt% of potassium gluconate and 74-76 wt% of deionized water.

As a specific embodiment of the invention, the aqueous solution formula of the passivating agent is as follows: 20-30 wt% of hydrogen peroxide; 2-4 wt% citric acid; 3-4 wt% hexamethylenetetramine; 62-75 wt% deionized water. Preferably, 30 wt% of hydrogen peroxide, 3 wt% of citric acid, 3 wt% of hexamethylenetetramine and 64 wt% of deionized water.

As a specific embodiment of the invention, the aqueous solution formula of the sealant is as follows: 10-15 wt% of phytic acid; 2-5 wt% of phosphate; 1-5 wt% of imidazolidinone; 1-5 wt% of pyrazinamide; 5-10 wt% of adipic acid; 0.1-2 wt% of sodium dodecyl sulfate; 10-15 wt% of malic acid; 10-15 wt% of tannic acid; 5-8 wt% of triethylamine; 20-70 wt% of deionized water. Preferably, the formulation of the sealant is: 12 wt% of phytic acid; 3 wt% of phosphate; 3 wt% of imidazolidinone; 2 wt% of pyrazinamide; adipic acid 8 wt%; 0.15 wt% of sodium dodecyl sulfate; 12 wt% of malic acid; 12 wt% of tannic acid; 7 wt% of triethylamine; 40.85 wt% of deionized water.

The preparation of the aqueous solution of the sealant can directly dissolve the sealant in water, and can also be prepared by adopting the following method:

step 1: mixing and stirring 10-15 wt% of phytic acid, 5-10 wt% of adipic acid, 10-15 wt% of malic acid, 10-15 wt% of tannic acid and 5-8 wt% of triethanolamine, heating to 60-70 ℃, and reacting for 2 hours to generate yellow transparent liquid;

step 2: adding 1-5 wt% of imidazolone and 1-5 wt% of pyrazinamide into the mixture by times, stirring, reacting for 1 hour, adding a proper amount of deionized water, stirring, adding 2-5 wt% of phosphate and 0.1-2 wt% of sodium dodecyl sulfate respectively under stirring, adding the balance of water after stirring uniformly, and mixing uniformly to obtain the sealant.

The invention also provides a use method of the patch, which comprises the following steps: and sequentially sticking the first patch, the second patch and the third patch to the part to be processed of the austenite workpiece according to the cleaning-passivating-sealing procedures, wherein the processing time of each patch is 22-26 hours.

To distinguish the three patches, one skilled in the art may use different colors or other means for identification, such as a red patch for cleaning, a yellow patch for passivation, and a blue patch for sealing.

According to the invention, the anticorrosive surface treatment of the large-size and special-shaped austenite workpiece is realized by adopting a combination mode of three patches containing different treating agents, so that the condition that the treating agents flow and disperse in the traditional method is avoided; under the cooperation of the three treating agents, the corrosion prevention treatment effect of the austenite workpiece is obviously improved. The patch and the use method thereof have important significance for actual industrial production.

Drawings

Fig. 1 is a schematic diagram of a patch for surface treatment of an austenitic stainless steel workpiece as described in example 1. In the figure: 1. a first patch; 2. a gel layer; 3. a second patch; 4. a gel layer; 5. a third patch; 6. a gel layer.

FIG. 2 is a graph of open circuit potential of samples of example 2 before and after cleaning, passivating, and sealing a 301 austenitic stainless steel workpiece.

FIG. 3 is a polarization curve of a sample before and after cleaning, passivating, and sealing the 301 austenitic stainless steel workpiece in example 2.

FIG. 4 is a graph of the impedance of samples of example 2 before and after cleaning, passivating, and sealing a 301 austenitic stainless steel workpiece.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example 1

The present example provides a patch for surface treatment of an austenitic stainless steel workpiece, comprising:

a first patch, a second patch, and a third patch; the first patch, the second patch and the third patch are substrates with gel layers; wherein:

the gel layer is starch hydrogel, and the thickness of the gel layer is 1-3 mm. The gel porosity is more than 90%.

The gel layer of the first patch contains a cleaning agent; the cleaning agent accounts for 50% of the total mass fraction of the gel layer.

The gel layer of the second patch contains a passivating agent; the passivant accounts for 50% of the total mass fraction of the gel layer.

The gel layer of the third patch contains a sealant; the sealant accounts for 50% of the total mass fraction of the gel layer.

As shown in fig. 1, the adhesive plaster comprises a red high-viscosity patch 1, a gel layer 2 with a cleaning agent, a yellow high-viscosity patch 3, a gel layer 4 with a passivating agent, a yellow high-viscosity patch 5 and a gel layer 6 with a sealing agent.

The substrate is made of non-woven fabric and has a thickness of 1-5 mm.

The gel layer is made of one of starch hydrogel, cellulose hydrogel, alginic acid hydrogel and chitosan hydrogel. The thickness is 1-3 mm.

The cleaning agent is potassium gluconate.

The passivator comprises the following components in parts by weight: 30 parts of hydrogen peroxide, 3 parts of citric acid and 3 parts of hexamethylenetetramine.

The sealant comprises the following components in parts by weight: 12 parts of phytic acid, 3 parts of phosphate, 3 parts of imidazolidinone, 2 parts of pyrazinamide, 8 parts of adipic acid, 0.15 part of sodium dodecyl sulfate, 12 parts of malic acid, 12 parts of tannic acid and 7 parts of triethylamine.

Example 2

The method of making the patch of embodiment 1, comprising: according to the proportion, respectively diluting a cleaning agent, a passivating agent and a sealing agent to aqueous solutions with certain concentrations, respectively soaking three substrates with gel layers in the aqueous solutions of the cleaning agent, the passivating agent and the sealing agent, and respectively obtaining a first patch, a second patch and a third patch after all the aqueous solutions are absorbed;

the aqueous solution formula of the cleaning agent comprises the following components: potassium gluconate: 25 wt%, deionized water: 75 wt%.

The formula of the water solution of the passivating agent is as follows: citric acid: 3 wt%; deionized water: 64 wt%; hexamethylenetetramine: 3 wt%; hydrogen peroxide: 30 wt%.

The aqueous solution formula of the sealant comprises the following components: phytic acid: 12 wt%; phosphate ester: 3 wt%; imidazolinone: 3 wt%; pyrazinamide: 2 wt%; adipic acid: 8 wt%; sodium dodecyl sulfate: 0.15 wt%; malic acid: 12 wt%; tannic acid: 12 wt%; and (3) triacetamide: 7 wt%; deionized water: 40.85 wt%.

Example 3

A method of using the patch of embodiment 1, comprising:

s1, cleaning, comprising the following steps:

step 1, firstly, 25 wt% of potassium gluconate and 75 wt% of deionized water are mixed and stirred to obtain a cleaning agent solution.

And 2, dripping the cleaning agent into the middle gel position of the red patch, and obtaining the cleaning patch after the gel sufficiently absorbs the cleaning agent.

And 3, attaching the cleaning patch to the part to be treated of the 301 austenitic stainless steel, and cleaning for 24 hours.

S2, passivating, comprising the following steps:

step 1, uniformly mixing 3 wt% of citric acid, 64 wt% of deionized water, 30 wt% of hydrogen peroxide and 3 wt% of hexamethylenetetramine to obtain a passivating agent solution.

And 2, dripping the cleaning agent into the middle gel position of the yellow patch, and obtaining the passivated patch after the gel fully absorbs the passivator.

And 3, attaching the passivation patch to the cleaned part of the 301 austenitic stainless steel, and passivating for 24 hours.

S3, sealing, comprising the following steps:

step 1, mixing and stirring 12 wt% of phytic acid, 8 wt% of adipic acid, 12 wt% of malic acid, 12 wt% of tannic acid and 7 wt% of triethanolamine, heating to 60-70 ℃, and reacting for 2 hours to generate yellow transparent liquid.

And 2, adding 3 wt% of imidazolone and 2 wt% of pyrazinamide into the mixture for stirring for several times, reacting for 1 hour, adding 20.85 wt% of deionized water, stirring, adding 3 wt% of phosphate and 0.15 wt% of sodium dodecyl sulfate respectively, stirring uniformly, adding 20 wt% of deionized water, and mixing uniformly to obtain the sealant.

And 3, adsorbing the sealant to the middle gel position of the blue passivated patch, and obtaining the sealed patch after the sealant is fully absorbed by the gel.

And 4, attaching the sealing patch to the cleaned and passivated part of the 301 austenitic stainless steel, and sealing for 24 hours.

Effect testing

Embodiment 3 through the passivation of different colours post cooperation reagent to bulky assembly spare carries out quick local protection to realize high-efficient convenient chemical treatment to the bulky structure of shaping.

The main characteristics are as follows: other undamaged areas are not damaged, disassembly is not needed, and continuous manual operation is not needed.

And (3) carrying out experimental verification on the protection treatment and the non-treatment: the corrosion resistance of the workpiece before and after the chemical surface treatment is shown in fig. 2, 3, and 4.

Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A patch for surface treatment of an austenitic workpiece, comprising: a first patch, a second patch, and a third patch;

the first patch, the second patch and the third patch respectively comprise a substrate and a gel layer attached to one side of the substrate; wherein:

the gel layer of the first patch contains a cleaning agent;

the gel layer of the second patch contains a passivating agent;

the gel layer of the third patch contains a sealer.

2. The patch according to claim 1, wherein the substrate is made of one or more materials selected from the group consisting of a hot-rolled nonwoven fabric, a spunlaced nonwoven fabric, and a heat-sealed nonwoven fabric;

and/or the thickness of the substrate is preferably 1 to 5 mm.

3. A patch according to claim 1 or 2, wherein the gel layer is made of one or more materials selected from the group consisting of starch-based hydrogel, cellulose-based hydrogel, alginic acid-based hydrogel and chitosan-based hydrogel;

and/or, preferably, the gel layer has a thickness in the range of 1-3 mm.

4. A patch according to claim 3, wherein the cleansing agent is selected from gluconate and/or trisodium phosphate.

5. A patch according to claim 4, wherein the cleansing agent is a gluconate.

6. A patch according to claim 5 wherein the cleaning agent is potassium gluconate or sodium gluconate.

7. A patch according to claim 4, wherein said cleansing agent is added in an amount of not less than 50% by mass based on the total mass of the gel layer in said first patch.

8. A patch according to claim 4, wherein the passivating agent comprises the following components in parts by weight: 20-30 parts of hydrogen peroxide, 2-4 parts of citric acid and 3-4 parts of hexamethylenetetramine.

9. A patch according to claim 8 wherein the deactivant comprises the following components in parts by weight: 30 parts of hydrogen peroxide, 3 parts of citric acid and 3 parts of hexamethylenetetramine.

10. A patch according to claim 8, wherein the passivating agent is added in an amount of not less than 50% of the total mass of the gel layer in the second patch.

11. A patch according to claim 9 wherein the sealant comprises the following components in parts by weight: 10-15 parts of phytic acid, 2-5 parts of phosphate, 1-5 parts of imidazolidinone, 1-5 parts of pyrazinamide, 5-10 parts of adipic acid, 0.1-2 parts of sodium dodecyl sulfate, 10-15 parts of malic acid, 10-15 parts of tannic acid and 5-8 parts of triethylamine;

and/or the addition amount of the sealant is not less than 50% of the total mass of the gel layer in the third patch.

12. A patch according to claim 11 wherein the sealant comprises the following components in parts by weight: 12 parts of phytic acid, 3 parts of phosphate, 3 parts of imidazolidinone, 2 parts of pyrazinamide, 8 parts of adipic acid, 0.15 part of sodium dodecyl sulfate, 12 parts of malic acid, 12 parts of tannic acid and 7 parts of triethylamine.

13. A method of manufacturing a patch according to any one of claims 1 to 12, comprising: according to the proportion, respectively diluting a cleaning agent, a passivating agent and a sealing agent to aqueous solutions with certain concentrations, respectively soaking three substrates with gel layers in the aqueous solutions of the cleaning agent, the passivating agent and the sealing agent, and respectively obtaining a first patch, a second patch and a third patch after the aqueous solutions are absorbed;

wherein the concentration of the aqueous solution of the cleaning agent is 20-30 wt%;

the concentration of the water solution of the passivating agent is 25-38 wt%;

the concentration of the aqueous solution of the sealant is 30-80 wt%.

14. A patch according to claim 13, wherein said aqueous solution of the cleansing agent has a concentration of 24-26% by weight.

15. A patch according to claim 13 wherein the aqueous solution of the deactivant has a concentration of from 35 to 37% by weight.

16. A patch according to claim 13, wherein the aqueous solution of the blocking agent has a concentration of 59-60% by weight.

17. A method of using the patch of any one of claims 1-12, comprising: and sequentially sticking the first patch, the second patch and the third patch to the part to be processed of the austenite workpiece according to the cleaning-passivating-sealing procedures, wherein the processing time of each patch is 22-26 hours.