CN112301340A - Stainless steel passivation solution and method for improving corrosion resistance of stainless steel wire drawing floor drain - Google Patents
Stainless steel passivation solution and method for improving corrosion resistance of stainless steel wire drawing floor drain Download PDFInfo
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- CN112301340A CN112301340A CN202011052508.8A CN202011052508A CN112301340A CN 112301340 A CN112301340 A CN 112301340A CN 202011052508 A CN202011052508 A CN 202011052508A CN 112301340 A CN112301340 A CN 112301340A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/167—Phosphorus-containing compounds
- C23F11/1676—Phosphonic acids
Abstract
The invention discloses a stainless steel passivation solution and a method for improving the corrosion resistance of a stainless steel wire drawing floor drain, wherein the stainless steel passivation solution comprises, by mass, 30.0-40.0% of citric acid, 2.0-4.3% of hydroxyethylidene diphosphonic acid, 3.0-8.0% of polymaleic acid, 4.0-7.0% of sodium sorbate, 5.0-12.0% of 1-benzylpyridinium-3-carboxylate and the balance of water. The method for improving the corrosion resistance of the stainless steel wire drawing floor drain is to passivate the stainless steel wire drawing floor drain by using the stainless steel passivating solution. The invention has good passivation effect, only citric acid is contained in the inorganic acid, nitric acid and sulfuric acid are not contained, the use of the inorganic acid is more environment-friendly and healthy for bathroom products, and the inorganic acid can not cause harm to operators on the passivation site.
Description
Technical Field
The invention relates to the field of corrosion resistance, in particular to a method for improving the corrosion resistance of a stainless steel wire-drawing floor drain.
Background
The stainless steel wire-drawing floor drain is used as a product with high frequency in a bathroom product, the surface of the stainless steel wire-drawing floor drain is subjected to wire-drawing treatment, and scrap iron and impurities on the surface cannot be removed completely before leaving a factory, so that the stainless steel wire-drawing floor drain is easy to rust during decoration. 21/7/2020, published by GB/T27710-. In actual tests, the neutral salt spray test of the stainless steel wire-drawing floor drain cannot pass 96h 9 grade required by national standard, and the detergent resistance test result is unqualified.
In order to overcome the above problems, it is necessary to improve the corrosion resistance of stainless steel products, and stainless steel passivation treatment is mainly used for protection. Firstly, the traditional stainless steel passivation mainly adopts concentrated sulfuric acid, concentrated nitric acid, chromic acid and the like as strong oxidants to carry out stainless steel surface passivation treatment. However, concentrated nitric acid and concentrated sulfuric acid have strong corrosivity and great harm to human bodies. The chromic acid contains hexavalent chromium which is a carcinogen and has strong corrosivity, and the hexavalent chromium is a carcinogen and has great destructiveness to human bodies and the environment. Secondly, for different types of materials, different passivation solutions are required to be used according to the properties of the materials; even if the same kind of materials, such as stainless steel, are used, the drawing forming process of the stainless steel can promote the internal structure of the stainless steel to be converted, the drawing process has great damage to the surface and can affect the corrosion resistance, and passivation is generally adopted to achieve a good corrosion resistance effect, but the corrosion resistance requirement of the stainless steel drawing floor drain cannot be met by using common passivation solution, and the passivation solution needs to be optimized and/or combined with a post-treatment process to achieve better corrosion resistance. Therefore, the general passivation solution is not applicable, and needs to be further optimized on the composition of the passivation solution and the passivation process and/or the post-treatment process to meet the requirement.
Disclosure of Invention
The first purpose of the present invention is to provide a stainless steel passivation solution that does not contain concentrated sulfuric acid, concentrated nitric acid, chromic acid, and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a stainless steel passivation solution comprises, by mass, 30.0-40.0% of citric acid, 2.0-4.3% of hydroxyethylidene diphosphonic acid, 3.0-8.0% of polymaleic acid, 4.0-7.0% of sodium sorbate, 5.0-12.0% of 1-benzylpyridinium-3-carboxylate and the balance of water.
Preferably, the stainless steel passivation solution comprises, by mass, 35.0-40.0% of citric acid, 3.5-4.3% of hydroxyethylidene diphosphonic acid, 4.5-8.0% of polymaleic acid, 4.5-7.0% of sodium sorbate, 7.0-12.0% of 1-benzylpyridinium-3-carboxylate and the balance of water.
Preferably, the stainless steel passivation solution comprises, by mass, 35.0-39.0% of citric acid, 3.5-3.9% of hydroxyethylidene diphosphonic acid, 4.5-6.0% of polymaleic acid, 4.5-6.0% of sodium sorbate, 7.0-9.0% of 1-benzylpyridinium-3-carboxylate and the balance of water.
Preferably, the stainless steel passivation solution comprises, by mass, 38% of citric acid, 3.8% of hydroxyethylidene diphosphonic acid, 5.0% of polymaleic acid, 5.0% of sodium sorbate, 7.5% of 1-benzylpyridine-3-carboxylate and the balance of water.
The invention also aims to provide a method for improving the corrosion resistance of the stainless steel wire drawing floor drain, which passivates the stainless steel wire drawing floor drain by adopting the stainless steel passivating solution.
Preferably, the method for improving the corrosion resistance of the stainless steel wire-drawing floor drain comprises the following steps:
1) pretreatment: the surface of the stainless steel wiredrawing floor drain is provided with a uniform water film, so that the passivation requirement can be met;
2) passivation: soaking the cleaned stainless steel wire drawing floor drain in a prepared passivation solution for acid washing passivation, wherein the passivation temperature is 20-30 ℃, and the passivation time is 10-20 min; the passivation solution is the stainless steel passivation solution;
3) cleaning: cleaning the passivation solution obtained in the step 2);
4) and (3) drying 1: drying with hot air to ensure no water stain on the surface;
5) and (3) post-treatment: soaking the dried stainless steel wire drawing floor drain in a post-treatment solution at normal temperature and keeping for 10-30 s;
the post-treatment solution comprises 8.0 to 15.0 percent of hydroxyethylidene diphosphonic acid, 4.0 to 10.0 percent of ethanol, 2.5 to 5.0 percent of isopropanol and the balance of food-grade white oil according to mass percentage;
6) and (3) drying 2: drying with hot air to ensure the formation of a surface film after surface post-treatment, and checking various technical indexes of a passivation film and a sealing film after standing for 24 hours.
Preferably, in the step 1), the pretreatment is carried out by adding a cleaning agent into an ultrasonic cleaning machine for cleaning, the ultrasonic frequency is 35-45kHz, the cleaning temperature is 58-62 ℃, the cleaning time is 5-7min, and then the cleaning is carried out by soaking with flowing water by using 1-2 tap water for 2-3 min.
Preferably, in the step 3), 1 tap water and 1 deionized water are respectively adopted for soaking and cleaning with flowing water, and the cleaning time is 2-3 min.
Preferably, the post-treatment solution comprises, by mass, 10.0-15.0% of hydroxyethylidene diphosphonic acid, 5.5-10.0% of ethanol, 3.0-5.0% of isopropanol, and the balance of food-grade white oil.
Preferably, the post-treatment solution comprises, by mass, 10.0-13.0% of hydroxyethylidene diphosphonic acid, 5.5-8.0% of ethanol, 3.0-4.0% of isopropanol, and the balance of food-grade white oil.
The passivation solution and the method for improving the corrosion resistance of the stainless steel wire drawing floor drain comprise the following components:
the citric acid is extracted from plants, is usually used as a food additive, is easy to obtain, has no pollution to the environment, and meets the requirement of environmental protection. Meanwhile, the citric acid has stronger activity on iron than chromium, and iron and oxides on the surface of the stainless steel can be dissolved under the action of the citric acid, so that the chromium-poor layer is removed, chromium is enriched on the surface of the stainless steel, and the corrosion resistance is improved. The citric acid in the passivation solution is lower than 30%, iron and oxides on the surface of the stainless steel wire-drawing product cannot be completely dissolved, and the requirements of salt spray test and detergent resistance performance test of national standards cannot be met. The citric acid in the passivation solution is higher than 40%, so that the surface color of the stainless steel wire-drawing product is changed, and the metal glossiness of the stainless steel is lost.
Hydroxyethylidene diphosphonic acid (HEDP) having the formula-C-P (O) (OH)2The structure has better chemical stability, can form stable chelate with iron and oxide, deposits on the surface of stainless steel, retards the dissolution corrosion of the covered surface and promotes the passivation process of the uncovered surface. However, hydroxyethylidene diphosphonic acid is a compound with strong chelating ability, and the concentration of hydroxyethylidene diphosphonic acid increases, so that hydroxyethylidene diphosphonic acid can react with Fe2+The ions form another chelate with higher solubility, so that the stainless steel can not enter a passivation state. In the passivation solution, if the content of hydroxyethylidene diphosphonic acid is higher than 4.3 percent, the stainless steel can not enter a passivation state; the mass ratio is lower than 2%, and the effect can not meet the requirements of salt spray test and detergent resistance test of national standard. The hydroxyethylidene diphosphonic acid is added into the post-treatment solution to play a role in inhibiting scale, and 8.0-15.0 percent of the hydroxyethylidene diphosphonic acid in the post-treatment solution has the best scale inhibition effect.
The polar groups (-COOH) and (-OH) in polymaleic acid molecules can be used as adsorption centers, form chelate with iron ions, adsorb on the surface of stainless steel, and form a layer of protective film on the metal surface, thus playing a role in inhibiting corrosion. The corrosion resistance can be enhanced by using the polymaleic acid and the hydroxyethylidene diphosphonic acid in a matching way. The polymaleic acid has the best effect when being matched with hydroxyethylidene diphosphonic acid within 3.0-8.0%.
The sodium sorbate has carbon-carbon double bonds to generate a conjugation effect, and can react with iron and oxides to form a complex while forming a compact multilayer composite layered network to form a layer of protective film, so that the corrosion resistance is further improved on the basis of hydroxyethylidene diphosphonic acid and polymaleic acid. The multilayer composite organic adsorption film on the surface of the stainless steel provides polarization resistance, and prevents the corrosion of the surface of the stainless steel. Chelate formed by the reaction of hydroxyethylidene diphosphonic acid and polymaleic acid with iron and oxide and complex formed by sodium sorbate with iron and oxide are densely deposited on the surface of stainless steel to prevent the corrosion of the stainless steel.
The 1-benzylpyridinium-3-carboxylate is used as the surfactant mainly for reducing the surface tension between the passivation solution and the stainless steel and increasing the affinity action of the passivation solution on the surface of the stainless steel, so that the gas on the surface of the stainless steel is difficult to retain and separate, and the generation of pinholes on the surface of a passivation film is prevented.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that:
1. according to the invention, hydroxyethylidene diphosphonic acid, polymaleic acid and sodium sorbate are introduced into the passivation solution, the content of each component in the passivation solution is further optimized, and the performance of the passivation solution is improved through reasonable proportioning, so that the corrosion resistance of the floor drain is improved. Wherein, hydroxyl ethylidene diphosphonic acid, polymaleic acid and sodium sorbate are introduced to respectively form chelate and complex on the surface of the stainless steel, and the chelate and complex are densely accumulated on the surface of the stainless steel to form a compact passivation film, and the passivation effect is close to that of a passivation system of nitric acid and chromate.
2. According to the invention, food-grade white oil, hydroxyethylidene diphosphonic acid, ethanol and isopropanol are adopted to be capable of mutually and chemically cross-linking with the passivated stainless steel surface to form a more compact corrosion inhibition film, which is beneficial to blocking a diffusion channel of metal ions and also beneficial to hindering corrosive media from permeating the stainless steel surface, thereby improving the corrosion prevention effect and the protection life of the stainless steel wire drawing product; passivation combined with post-treatment, the corrosion protection performance of the passivation system exceeds that of nitric acid and chromate.
3. According to the scheme of the invention, the inorganic acid only contains citric acid, and no nitric acid or sulfuric acid, so that the sanitary ware is more environment-friendly and healthy in use, and does not cause harm to passivation field operators.
Detailed Description
The invention is further illustrated by the following specific examples, but the invention is not limited thereto.
Example 1
Pretreatment of the stainless steel wire drawing floor drain: cleaning with an ultrasonic cleaner at ultrasonic frequency of 40kHz and cleaning temperature of 60 deg.C for 6min, and soaking and cleaning with 1-2 channels of tap water for 2.5 min; so that the surface of the stainless steel wiredrawing floor drain can generate uniform water film, and the passivation requirement can be met.
Passivation: soaking the cleaned stainless steel wire drawing floor drain in a prepared passivation solution for acid washing passivation, wherein the passivation temperature is 25 ℃, and the passivation time is 15 min;
the passivation solution is 30.0 percent of citric acid, 2.0 percent of hydroxyethylidene diphosphonic acid, 3.0 percent of polymaleic acid, 4.0 percent of sodium sorbate, 5.0 percent of 1-benzyl pyridinium-3-carboxylate and the balance of water;
cleaning: respectively adopting 1 path of tap water and 1 path of deionized water to carry out flowing water soaking and cleaning, wherein the cleaning time is 2.5 min;
and (3) drying 1: drying with hot air to ensure no water stain on the surface;
and (3) post-treatment: soaking the dried stainless steel wire drawing floor drain in a post-treatment solution at normal temperature for 15 s;
the post-treatment solution is 12 percent of hydroxyethylidene diphosphonic acid, 6.5 percent of ethanol, 3.5 percent of isopropanol and the balance of food-grade white oil;
and (3) drying 2: drying with hot air to ensure the formation of a surface film after surface post-treatment, and checking various technical indexes of a passivation film and a sealing film after standing for 24 hours.
Examples 2 to 6
The components of the passivation solution are shown in Table 1, and the rest is the same as example 1.
Comparative example 1:
the stainless steel wire drawing floor drain passivation solution containing nitric acid and dichromic acid comprises the following components in percentage by mass: 35% of nitric acid, 5% of potassium dichromate and the balance of water;
comparative example 1 the passivation method comprises the following steps:
(1) cleaning with an ultrasonic cleaner at ultrasonic frequency of 36kHz and cleaning temperature of 60 deg.C for 6min, and soaking and cleaning with 1 tap water for 3 min;
(2) passivating the stainless steel wire drawing floor drain by using a prepared passivation solution in a soaking mode, wherein the passivation temperature is 55 ℃, and the passivation time is 20 min;
(3) respectively adopting 1 path of tap water and 1 path of deionized water to carry out flowing water soaking and cleaning, wherein the cleaning time is 2.5 min;
(4) and (3) drying 1: drying with hot air to ensure that no water stain remains on the surface, and checking various technical indexes of the passivation film after standing for 24 hours;
TABLE 1 compositions of the components of the examples and comparative examples
The passivation solutions for the stainless steel water tank of examples 1-6 were subjected to various technical index tests of the passivation film as shown in table 2, wherein:
(1) corrosion performance of salt spray
And (3) carrying out a neutral salt spray limit test (CASS) according to GB/T10125-2012 salt spray test for artificial atmosphere corrosion test, and evaluating the test result according to GB/T6461-2002-rating of the test piece and the test piece after the corrosion test of the metal and other inorganic coatings on the metal substrate until the surface is of grade 9.
(2) Evaluation by blue dot method
And (3) testing according to GB/T25150-.
(3) Detergent resistance test
According to GB/T27710-: a) ammonia (ammonium hydroxide) (6.0 mol/L); b) sodium hydroxide (1.0 mol/L); c) surfactants (100% oxidized polyvinyl alcohol); d) hydrochloric acid (0.1 mol/L). And after 16h, washing with clear water to remove the residual solution on the surface, air-drying the surface, and checking to ensure that the surface has no adverse phenomena such as bubbling, peeling, whitening and the like.
(4) Toxicity testing
Lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers, di (2-ethylhexyl) phthalate, tolylbutyl phthalate, dibutyl phthalate, diisobutyl phthalate were tested according to the rohs2.0 revision instruction (EU)2015/863 for a total of 10 substance limits.
TABLE 2 Corrosion resistance test results
As can be seen from Table 2, the passivation solution provided by the invention has good corrosion prevention effect after being combined with post-treatment, and the corrosion resistance and the detergent resistance are obviously improved compared with those of the passivation solution 304. The corrosion resistance is superior to that of nitric acid passivation, the performance of the detergent can pass, and the nitric acid passivation cannot pass the detergent resistance test. The corrosion resistance and the detergent resistance of the stainless steel wiredrawing floor drain treated by the method are superior to those of a comparative example 2, the hydroxyethylidene diphosphonic acid in the comparative example 2 is higher than 4.3%, and the method plays a role in inhibiting passivation, so that the performance test results of neutral salt spray, a blue dot method and the detergent resistance of the passivated stainless steel wiredrawing floor drain are unqualified.
Claims (10)
1. A stainless steel passivation solution comprises, by mass, 30.0-40.0% of citric acid, 2.0-4.3% of hydroxyethylidene diphosphonic acid, 3.0-8.0% of polymaleic acid, 4.0-7.0% of sodium sorbate, 5.0-12.0% of 1-benzylpyridinium-3-carboxylate and the balance of water.
2. A stainless steel passivation solution comprises, by mass, 35.0-40.0% of citric acid, 3.5-4.3% of hydroxyethylidene diphosphonic acid, 4.5-8.0% of polymaleic acid, 4.5-7.0% of sodium sorbate, 7.0-12.0% of 1-benzylpyridinium-3-carboxylate and the balance of water.
3. A stainless steel passivation solution comprises, by mass, 35.0-39.0% of citric acid, 3.5-3.9% of hydroxyethylidene diphosphonic acid, 4.5-6.0% of polymaleic acid, 4.5-6.0% of sodium sorbate, 7.0-9.0% of 1-benzylpyridinium-3-carboxylate and the balance of water.
4. A stainless steel passivation solution comprises, by mass, 38% of citric acid, 3.8% of hydroxyethylidene diphosphonic acid, 5.0% of polymaleic acid, 5.0% of sodium sorbate, 7.5% of 1-benzylpyridine-3-carboxylate and the balance of water.
5. A method for improving corrosion resistance of a stainless steel wire-drawing floor drain is characterized in that the stainless steel passivation solution of any one of claims 1 to 4 is adopted to passivate the stainless steel wire-drawing floor drain.
6. The method of claim 5, comprising the steps of:
1) pretreatment: the surface of the stainless steel wiredrawing floor drain is provided with a uniform water film, so that the passivation requirement can be met;
2) passivation: soaking the cleaned stainless steel wire drawing floor drain in a prepared passivation solution for acid washing passivation, wherein the passivation temperature is 20-30 ℃, and the passivation time is 10-20 min; the passivation solution is the stainless steel passivation solution of any one of claims 1 to 4;
3) cleaning: cleaning the passivation solution obtained in the step 2);
4) and (3) drying 1: drying with hot air to ensure no water stain on the surface;
5) and (3) post-treatment: soaking the dried stainless steel wire drawing floor drain in a post-treatment solution at normal temperature and keeping for 10-30 s;
the post-treatment solution comprises 8.0 to 15.0 percent of hydroxyethylidene diphosphonic acid, 4.0 to 10.0 percent of ethanol, 2.5 to 5.0 percent of isopropanol and the balance of food-grade white oil according to mass percentage;
6) and (3) drying 2: drying with hot air to ensure the formation of a surface film after surface post-treatment, and checking various technical indexes of a passivation film and a sealing film after standing for 24 hours.
7. The method of claim 6, wherein: in the step 1), the pretreatment is carried out by adding a cleaning agent into an ultrasonic cleaning machine for cleaning, the ultrasonic frequency is 35-45kHz, the cleaning temperature is 58-62 ℃, the cleaning time is 5-7min, then, 1-2 tap water is adopted for soaking and cleaning with flowing water, and the cleaning time is 2-3 min.
8. The method of claim 6, wherein: in the step 3), 1 path of tap water and 1 path of deionized water are respectively adopted for soaking and cleaning with flowing water, and the cleaning time is 2-3 min.
9. The method of claim 6, wherein: the post-treatment solution comprises, by mass, 10.0-15.0% of hydroxyethylidene diphosphonic acid, 5.5-10.0% of ethanol, 3.0-5.0% of isopropanol, and the balance of food-grade white oil.
10. The method of claim 6, wherein: the post-treatment solution comprises, by mass, 10.0-13.0% of hydroxyethylidene diphosphonic acid, 5.5-8.0% of ethanol, 3.0-4.0% of isopropanol, and the balance of food-grade white oil.
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