CN111926338A - Stainless steel cleaning passivator and application thereof - Google Patents
Stainless steel cleaning passivator and application thereof Download PDFInfo
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- CN111926338A CN111926338A CN202010676368.5A CN202010676368A CN111926338A CN 111926338 A CN111926338 A CN 111926338A CN 202010676368 A CN202010676368 A CN 202010676368A CN 111926338 A CN111926338 A CN 111926338A
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/088—Iron or steel solutions containing organic acids
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/36—Regeneration of waste pickling liquors
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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Detergent Compositions (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to a stainless steel cleaning passivator and application thereof, and the stainless steel cleaning passivator comprises the following components in parts by mass based on the total weight of the passivator: 10-40% of organic acid, 5-10% of organic acid salt, 1-5% of surfactant, 1-5% of chelating agent, 1-3% of passivation oxidation auxiliary agent and the balance of water; wherein the passivation oxidation auxiliary agent is alkali metal salt. The acid of the stainless steel cleaning passivator is organic acid, acid mist and waste acid are not generated in the acid cleaning process, the passivator is suitable for rinsing stainless steel by a micro-electrolytic oxidation method, and the passivator is environment-friendly and high in safety.
Description
Technical Field
The invention relates to the technical field of metal pickling, in particular to a stainless steel cleaning passivator and application thereof.
Background
The stainless steel environment-friendly cleaning passivator is prepared by taking an environment-friendly organic acid oxidant as a main body, adding a high-efficiency corrosion inhibitor, an inorganic active agent, a surfactant and the like, and compounding. Is a novel high-tech material. The method is widely applicable to the acid-washing oxide skin of stainless steel plates, profiles, pipes, bars, casting parts and various non-standard parts, and is assisted by the passivation function. Can completely replace the traditional acid cleaning which mainly uses inorganic acid such as sulfuric acid, nitric acid, hydrofluoric acid and the like, is more environment-friendly and safer, and has remarkable economic benefit.
The stainless steel has the characteristics of good corrosion resistance, high temperature resistance, low temperature resistance, wear resistance, exquisite appearance and the like, has wide application range, and is an important steel material for development of various departments of allergic economy. The stainless steel material is widely applied to the industries of aerospace, atomic energy, ocean development, petrochemical industry, automobiles, building decoration, household appliances, kitchen utensils and the like. Stainless steel must be subjected to acid pickling passivation before use to remove black scale on the metal surface due to high temperature.
At present, concentrated nitric acid and hydrofluoric acid are mainly mixed for pickling stainless steel, or sulfuric acid and hydrofluoric acid are mixed, and the main problems exist:
1. a large amount of waste acid is produced. The traditional inorganic mixed acid loses pickling capacity after working for a period of time and then becomes waste acid, and the harmless treatment with higher cost or the acid regeneration with higher energy consumption and very complicated equipment is needed.
2. A large amount of wastewater is produced. The stainless steel needs to be washed after being acid-washed. Since the rinse water contains a large amount of harmful ions, a large amount of waste water is generated.
3. A large amount of acid mist is generated in the acid washing process, the irritation is large, the human body is harmful, and the occupational safety hidden danger exists.
4. The loss of steel is large, and a large amount of waste is caused.
CN103409740A discloses a chromium-free metal passivator, which contains both phosphoric acid and citric acid. CN108425123A discloses an antirust cleaning agent for aluminum and aluminum alloy and a preparation method thereof, wherein the cleaning agent contains organic carboxylic acid, is alkaline and is not suitable for cleaning stainless steel workpieces. CN 109487280 a discloses a passivating agent for cleaning austenitic stainless steel, which contains citric acid and other components, but the cleaning effect on stainless steel is to be improved. CN103590054A discloses a passivating agent for cleaning galvanized metal parts, which contains oxalic acid and citric acid at the same time, but is not suitable for cleaning stainless steel parts. CN 110029352A discloses an environment-friendly acid washing agent for metal parts and a using method thereof, wherein, Hanohan inorganic acid and organic acid are used simultaneously. CN104841490A discloses a method for preparing a bimetallic passivator, which contains rare earth metals, is relatively expensive, and is only suitable for the passivation of nickel and vanadium metals.
Therefore, it is necessary to develop a passivating agent which is suitable for stainless steel and has less environmental protection and waste acid and waste water generation.
Disclosure of Invention
The invention aims to provide a stainless steel cleaning passivator and application thereof, aiming at solving the problems of environmental pollution caused by waste acid, waste water and acid mist generated in the current stainless steel pickling process, excessive steel loss and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
the stainless steel cleaning passivator comprises the following components in parts by mass based on the total weight of the passivator:
10-40% of organic acid, 5-10% of organic acid salt, 1-5% of surfactant, 1-5% of chelating agent, 1-3% of passivation oxidation auxiliary agent and the balance of water; wherein the passivation oxidation auxiliary agent is alkali metal salt.
Further, the pH of the stainless steel cleaning passivator is 1-2.
Further, the organic acid is at least one selected from the group consisting of citric acid, malic acid, phytic acid, linear benzenesulfonic acid, lauric acid, glycolic acid, tartaric acid, tannic acid, formic acid, acetic acid, propionic acid, oxalic acid, maleic acid, lactic acid, and succinic acid.
As a preferable technical scheme of the invention, the organic acid is citric acid, malic acid, tartaric acid, phytic acid and linear benzene sulfonic acid, wherein the weight ratio of the citric acid to the malic acid to the tartaric acid to the phytic acid to the linear benzene sulfonic acid is (5-15): (2-5): (0.5-1.5):(3-5). The organic acid combination firstly exerts acidity to react, complex and loosen the stainless steel oxide skin. Secondly, rinse waste water is more easily handled after cleaning.
Further, the organic acid salt is selected from at least one of ammonium citrate, sodium gluconate, sodium phytate, malate, maleate and hydroxyethylidene diphosphonic acid-4 sodium. The organic acid salt plays a role in permeation and washing assistance, and can also buffer the pH value of the solution, so that the stability of the solution is stronger.
As a preferred technical scheme of the invention, the organic acid salt is sodium phytate, ammonium citrate and hydroxyethylidene diphosphonic acid-4 sodium, wherein the weight ratio of the sodium phytate to the ammonium citrate to the hydroxyethylidene diphosphonic acid-4 sodium is (1-3) to (0.5-1): (1-3). The organic acid salt has the functions of washing aid and penetration, complexing and chelating, and can accelerate the speed of washing and passivation.
Further, the surfactant is at least one of fatty acid methyl ester ethoxy, lauryl glucoside, fatty alcohol-polyoxyethylene ether sodium sulfate, coconut oil diethanol amide and coconut oil alkanolamide phosphate. The surfactant is used for reducing the surface tension of the stainless steel, improving the permeability of the stainless steel cleaning passivator and enabling an oxide scale to be easily dispersed in a solution after falling off when in use.
As a preferable technical scheme of the invention, the surfactant is fatty alcohol polyoxyethylene ether sodium sulfate and coconut oil alkanolamide phosphate, wherein the weight ratio of the fatty alcohol polyoxyethylene ether sodium sulfate to the coconut oil alkanolamide phosphate is (2-3): (2-3). The surfactant mainly has the functions of reducing surface tension and osmosis, and has more obvious effect in organic acid environment.
Further, the chelating agent is 2 sodium ethylenediaminetetraacetic acid (EDTA2Na) and/or 4 sodium Iminodisuccinate (IDS). The chelating agent mainly plays a role in chelating metal ions in cleaning, can prevent ferric iron from corroding a base material, and can also stably passivate an oxidation auxiliary agent.
The organic acid is used for dissolving oxide skin on the surface of the stainless steel, and meanwhile, the organic acid has low corrosivity and does not corrode a stainless steel substrate, so that the content of metal ions in the stainless steel cleaning passivator is low, heavy metal ions in the cleaning solution can be effectively chelated due to the chelating agent contained in the formula, the service life of the stainless steel cleaning passivator is prolonged, the stainless steel cleaning passivator can be used for a long time, acid liquor cannot be scrapped due to metal ion saturation, and the purpose of not discharging waste acid is achieved.
Further, the passivation oxidation auxiliary agent is sodium percarbonate and/or potassium hydrogen persulfate. The passivation oxidation auxiliary agent has the effect that after the stainless steel oxidation layer falls off, a silvery white passivation film is formed on the surface of the stainless steel oxidation layer through the passivation oxidation auxiliary agent, and the later corrosion resistance of the stainless steel is greatly improved.
The preparation method of the stainless steel cleaning passivator cleaning agent comprises the following steps: mixing the components with water at normal temperature according to a ratio, and stirring uniformly to obtain the product.
The invention also provides application of the stainless steel cleaning passivator in cleaning passivated stainless steel, which comprises the following steps:
uniformly mixing a stainless steel cleaning passivator and water according to the volume ratio of 1:1-5, then heating the obtained mixed solution to above 70 ℃, and immersing the stainless steel to be treated in the mixed solution for cleaning and passivating, wherein the surface of the stainless steel to be treated is provided with a metal oxide layer;
after the cleaning and passivating treatment is finished, the stainless steel is rinsed by a micro-electrolysis oxidation method for water treatment.
Further, the method for treating the stainless steel rinsing water by the micro-electrolysis oxidation method comprises the following steps:
the anode adopts an electrode with a catalyst coating, the surface of the polar plate is loaded with a plurality of catalytic substance coatings, the stainless steel is immersed into rinsing water, and electrolysis treatment is carried out after the electrode is electrified. Based on the principle of electrochemical technology, the method utilizes free radicals and strong oxidizing particles (OH, O) generated in the electrolytic catalytic reaction process2、H2O2、O3、OCl-、Cl2Etc.) to perform oxidation degradation by selectively and rapidly reacting with organic pollutants in the wastewater to convert the difficultly biochemically degraded macromolecular organic matters into biochemically degraded micromolecular compounds, increase the B/C ratio, improve the biodegradability of the wastewater, and even finally decompose the organic matters into CO2、H2O, etc., degrading COD.
The main component in rinsing water used in the rinsing water treatment method is organic acid or organic acid compound, COD (chemical oxygen demand) accounts for a main pollution source, and other micro-content substances comprise a small amount of ammonia nitrogen and trace heavy metal. In addition, the hydroxyl radical generated by the micro-electrolysis wastewater can also automatically adjust the pH value, so that the rinsing water is always in a neutral state, acid liquor residue after rinsing is prevented, and the stainless steel environment-friendly cleaning passivator can really realize zero emission.
Further, the cleaning and passivating treatment time is adjusted according to the thickness of the scale on the surface of the stainless steel to be treated, and the thicker the scale, the longer the treatment time.
Further, the step of cleaning under ultrasonic conditions is included after the cleaning and passivation treatment, so that surface impurities can be removed, and the cleaning effect is improved.
By the scheme, the invention at least has the following advantages:
1. the stainless steel cleaning passivator disclosed by the invention does not generate waste acid in the process of cleaning passivated stainless steel, does not need cleaning a tank and replacing fresh acid, and can ensure the activity of the stainless steel cleaning passivator by regularly adding a certain proportion of the cleaning passivator into the cleaning tank, so that the stainless steel cleaning passivator can be continuously used. The problem that inorganic acid needs to be regularly cleaned from tank liquor to treat waste acid is avoided.
2. The steel needs to be washed by water after the traditional acid washing, thereby generating a large amount of industrial wastewater. The stainless steel cleaning passivator is used for pickling and passivating, and a micro-electrolysis oxidation method is adopted in the rinsing water treatment link, so that COD (chemical oxygen demand), ammonia nitrogen, total phosphorus and heavy metal in wastewater can be effectively removed, the cyclic use of flushing water can be realized, the wastewater discharge is basically avoided, and the discharge of a large amount of sludge can be reduced.
3. The stainless steel cleaning passivator disclosed by the invention is high in safety when used for cleaning passivated stainless steel, does not generate acid mist in the acid cleaning process, and reduces occupational safety risks. The cleaning passivator disclosed by the invention has low corrosivity, the pH value is 1-2, and the cleaning passivator has slight stimulation on human skin but does not burn.
4. The stainless steel cleaning passivator provided by the invention has the advantages that the stainless steel is low in loss when the passivated stainless steel is cleaned, the loss of the stainless steel can be controlled within 0.5-1.2%, and the surface oxide skin can be sufficiently removed under the condition of low steel loss.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a preferred embodiment of the present invention and is described in detail below.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
An environment-friendly stainless steel oxide skin cleaning passivator is composed of the following raw materials in percentage by mass: 10% of citric acid, 10% of malic acid, 4% of sodium gluconate, 2% of ammonium citrate, 1% of synthetic fatty alcohol-polyoxyethylene ether sodium sulfate, 1% of sodium percarbonate, 1% of disodium ethylene diamine tetraacetate and the balance of water.
The preparation method of the environment-friendly stainless steel oxide skin cleaning passivator comprises the following steps: mixing the components with water at normal temperature according to a ratio, and stirring uniformly to obtain the product.
The cleaning and passivating treatment method for the stainless steel casting by using the environment-friendly stainless steel oxide skin cleaning and passivating agent comprises the following steps:
firstly, the environmental-friendly stainless steel oxide skin cleaning passivator and water are mixed according to the volume ratio of 1:1, diluting, uniformly mixing, and heating to 70 ℃ to obtain the cleaning agent. And (3) putting the stainless steel casting with the oxidized black skin into the cleaning agent, passivating for 1 hour, and rinsing with clear water and ultrasonic waves after the treatment is finished to remove surface impurities.
After the cleaning and passivating treatment is finished, the rinsing water treatment is carried out on the stainless steel by adopting a micro-electrolysis oxidation method, and the method comprises the following steps:
the anode adopts a coating electrode, the surface of the polar plate is loaded with a plurality of catalytic substance coatings, the stainless steel is immersed into the electrolyte, and the electrolytic treatment is carried out after the electrode is electrified. The electrolyte has high mass transfer efficiency, greatly improves the current efficiency, the unit space-time efficiency, the sewage treatment efficiency and the organic matter degradation effect, and has good adaptability to wastewater with low conductivity. The water treated by the device can be recycled, and the usage amount of underground water is greatly reduced. The electrodes used in the above microelectrolytic oxidation process are commercially available.
After the treatment by the method, the black oxide skin on the surface of the stainless steel casting is removed, the surface of the stainless steel casting is a silvery white uniform passive film, and the loss of the stainless steel is 0.6%.
Example 2
A stainless steel weld cleaning passivator is composed of the following raw materials in percentage by mass: 30% of malic acid, 3% of ammonium citrate, 3% of sodium phytate, 1% of synthetic fatty alcohol-polyoxyethylene ether sodium sulfate, 2% of potassium hydrogen persulfate, 2% of iminodisuccinic acid 4 sodium (IDS) and the balance of water.
The preparation method of the environment-friendly stainless steel oxide skin cleaning passivator comprises the following steps: mixing the components with water at normal temperature according to a ratio, and stirring uniformly to obtain the product.
The cleaning and passivating treatment method for the stainless steel casting by using the environment-friendly stainless steel oxide skin cleaning and passivating agent according to the method of the embodiment 2 comprises the following steps:
firstly, the environmental-friendly stainless steel oxide skin cleaning passivator and water are mixed according to the volume ratio of 1: 2, diluting, uniformly mixing, and heating to 70 ℃ to obtain the cleaning agent. And (3) placing the welded stainless steel plate piece into the cleaning agent, passivating for 30 minutes, and rinsing with clear water and ultrasonic waves after the treatment is finished to remove surface impurities.
After the cleaning and passivation treatment, the stainless steel was subjected to rinsing water treatment by microelectrolytic oxidation according to the method of example 1.
After the treatment by the method, the red-black oxide skin at the stainless steel welding position is removed, the surface is a silvery-white uniform passive film, and the loss of the stainless steel is 0.5%.
Example 3
An environment-friendly stainless steel oxide skin cleaning passivator is composed of the following raw materials in percentage by mass: 5% of citric acid, 2% of malic acid, 3% of tartaric acid, 1% of phytic acid, 1% of straight-chain benzene sulfonic acid, 3% of sodium gluconate, 2% of ammonium citrate, 1% of synthetic fatty alcohol-polyoxyethylene ether sodium sulfate, 1% of sodium percarbonate, 2% of iminodisuccinic acid 4 sodium (IDS) and the balance of water.
Example 4
An environment-friendly stainless steel oxide skin cleaning passivator is composed of the following raw materials in percentage by mass: 10% of citric acid, 10% of malic acid, 3% of sodium phytate, 0.5% of ammonium citrate, 3% of hydroxyethylidene diphosphonic acid-4 sodium, 5% of lauryl glucoside, 3% of sodium percarbonate, 2% of disodium ethylene diamine tetraacetate and the balance of water.
Example 5
An environment-friendly stainless steel oxide skin cleaning passivator is composed of the following raw materials in percentage by mass: 10% of citric acid, 10% of malic acid, 3% of sodium phytate, 0.5% of ammonium citrate, 3% of hydroxyethylidene diphosphonic acid-4 sodium, 2% of fatty alcohol-polyoxyethylene ether sodium sulfate, 3% of coconut oil alkanolamide phosphate, 3% of sodium percarbonate, 1% of disodium ethylene diamine tetraacetate and the balance of water.
Example 6
An environment-friendly stainless steel oxide skin cleaning passivator is composed of the following raw materials in percentage by mass: 10% of citric acid, 30% of malic acid, 2% of sodium phytate, 1% of ammonium citrate, 2% of hydroxyethylidene diphosphonic acid-4 sodium, 2% of fatty alcohol-polyoxyethylene ether sodium sulfate, 3% of coconut oil alkanolamide phosphate, 2% of potassium hydrogen persulfate, 2% of iminodisuccinic acid-4 sodium (IDS), and the balance of water.
In the above embodiments, the environment-friendly stainless steel scale cleaning passivator disclosed by the invention is used for cleaning and passivating stainless steel castings, no waste acid or acid mist is generated, the environment-friendly stainless steel scale cleaning passivator can be recycled for a long time, rinsing water is always in a neutral state in the cleaning process, and the discharged water after rinsing is low in COD value and low in ammonia nitrogen, total phosphorus and heavy metal contents.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The stainless steel cleaning passivator is characterized by comprising the following components in parts by mass based on the total weight of the passivator:
10-40% of organic acid, 5-10% of organic acid salt, 1-5% of surfactant, 1-5% of chelating agent, 1-3% of passivation oxidation auxiliary agent and the balance of water; wherein the passivation oxidation auxiliary agent is alkali metal salt.
2. The stainless steel cleaning passivator of claim 1 wherein: the organic acid is selected from at least one of citric acid, malic acid, phytic acid, linear benzenesulfonic acid, lauric acid, glycolic acid, tartaric acid, tannic acid, formic acid, acetic acid, propionic acid, oxalic acid, maleic acid, lactic acid and succinic acid.
3. The stainless steel cleaning passivator of claim 1 wherein: the organic acid is citric acid, malic acid, tartaric acid, phytic acid and straight-chain benzene sulfonic acid, wherein the weight ratio of the citric acid to the malic acid to the tartaric acid to the phytic acid to the straight-chain benzene sulfonic acid is (5-15): (2-5): (0.5-1.5):(3-5): (1-3).
4. The stainless steel cleaning passivator of claim 1 wherein: the organic acid salt is selected from at least one of ammonium citrate, sodium gluconate, sodium phytate, malate, maleate and hydroxyethylidene diphosphonic acid-4 sodium.
5. The stainless steel cleaning passivator of claim 1 wherein: the organic acid salt is sodium phytate, ammonium citrate and hydroxyethylidene diphosphonic acid-4 sodium, wherein the weight ratio of the sodium phytate to the ammonium citrate to the hydroxyethylidene diphosphonic acid-4 sodium is (1-3) to (0.5-1): (1-3).
6. The stainless steel cleaning passivator of claim 1 wherein: the surfactant is at least one of fatty acid methyl ester ethoxy, lauryl glucoside, fatty alcohol-polyoxyethylene ether sodium sulfate, coconut oil diethanolamide and coconut oil alkanolamide phosphate.
7. The stainless steel cleaning passivator of claim 1 wherein: the surfactant is fatty alcohol-polyoxyethylene ether sodium sulfate and coconut oil alkanolamide phosphate, wherein the weight ratio of the fatty alcohol-polyoxyethylene ether sodium sulfate to the coconut oil alkanolamide phosphate is (2-3): (2-3).
8. The stainless steel cleaning passivator of claim 1 wherein: the chelating agent is ethylene diamine tetraacetic acid 2 sodium and/or imino disuccinic acid 4 sodium.
9. The stainless steel cleaning passivator of claim 1 wherein: the passivation oxidation auxiliary agent is sodium percarbonate and/or potassium hydrogen persulfate.
10. Use of a stainless steel cleaning passivator according to any of claims 1 to 9 in cleaning passivated stainless steel, comprising the steps of:
uniformly mixing the stainless steel cleaning passivator and water according to the volume ratio of 1:1-5, heating the obtained mixed solution to above 70 ℃, and immersing the stainless steel to be treated in the mixed solution for cleaning and passivating, wherein the surface of the stainless steel to be treated is provided with a metal oxide layer;
after the cleaning and passivating treatment is finished, the stainless steel is subjected to rinsing water treatment by adopting a micro-electrolysis oxidation method.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111441055A (en) * | 2020-04-24 | 2020-07-24 | 胡超红 | Metal antirust agent |
| CN112647071A (en) * | 2020-11-24 | 2021-04-13 | 东莞领杰金属精密制造科技有限公司 | Passivation method of stainless steel vapor chamber |
| CN113025445A (en) * | 2021-03-25 | 2021-06-25 | 中核四川环保工程有限责任公司 | Cleaning agent for cleaning high-temperature sintered metal filter |
| CN114181783A (en) * | 2021-11-24 | 2022-03-15 | 一汽解放汽车有限公司 | Cleaning composition, cleaning agent, preparation method thereof and cleaning method |
| CN114427097A (en) * | 2022-02-25 | 2022-05-03 | 沈阳永清环保科技有限公司 | Citric acid copper alloy pickling solution and preparation method thereof |
| CN114657493A (en) * | 2022-05-05 | 2022-06-24 | 河北华熙管业有限公司 | Corrosion-resistant galvanized steel pipe and production method thereof |
| CN114672812A (en) * | 2022-04-19 | 2022-06-28 | 沈阳永清环保科技有限公司 | Environment-friendly metal surface dust-removing finishing agent and preparation method thereof |
| CN114774942A (en) * | 2021-12-29 | 2022-07-22 | 苏州盈得化学科技有限公司 | Stainless steel pipe surface treating agent and preparation method and application thereof |
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