CN111254447A - Neutral rust removal passivation cleaning agent and use method thereof - Google Patents
Neutral rust removal passivation cleaning agent and use method thereof Download PDFInfo
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- CN111254447A CN111254447A CN202010210773.8A CN202010210773A CN111254447A CN 111254447 A CN111254447 A CN 111254447A CN 202010210773 A CN202010210773 A CN 202010210773A CN 111254447 A CN111254447 A CN 111254447A
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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
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
- C23G1/26—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions using inhibitors
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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
- C23C22/68—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 solutions with pH between 6 and 8
Abstract
The invention relates to a neutral rust removal passivation cleaning agent, which comprises a cleaning agent body, wherein the raw material formula of the cleaning agent body comprises the following components in percentage by weight: 5-25% of organic acid or a mixture of the organic acid and salts thereof, 2.5-25% of chelating agent, 6-25% of inorganic compound, 0.2-5% of surfactant, 0.2-2% of corrosion inhibitor and the balance of water; wherein the organic acid is one or more of oxalic acid, formic acid, malic acid, citric acid, maleic acid, tartaric acid, glycolic acid, lactic acid, glycine and adipic acid, the salt is one or more of potassium salt, sodium salt, ammonium salt and organic ammonium salt, and the chelating agent is an ammonia-carboxyl complexing agent. The neutral rust removal passivation cleaning agent is used for slowly and uniformly cleaning a cleaned part, so that the risk of scale block stripping and pipeline equipment blockage is greatly reduced. The corrosion to equipment made of various materials is small, and the waste liquid amount generated in the cleaning process can be further reduced by passivation, so that the environmental pollution in the cleaning process is reduced.
Description
Technical Field
The invention belongs to the technical field of cleaning agents, and relates to a neutral rust removal passivation cleaning agent and a using method thereof.
Background
In the conventional chemical cleaning, single strong acid or weak acid cleaning is generally adopted for rust removal, and the cleaning comprises hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, hydrofluoric acid, citric acid, sulfamic acid or a compound of the sulfamic acid and other compounds, most of the cleaning applications are acidic and have certain corrosivity, and a corrosion inhibitor is required to be added to reduce the corrosion of the cleaning process on equipment materials. The formulations can meet the requirements of conventional chemical cleaning, but a professional must guide the implementation, otherwise, the corrosion inhibitor is inappropriately applied to cause the problems of over-standard corrosion or hydrogen brittleness of materials and the like; generally, rinsing and passivation are needed after acid washing, the cleaning process is complex, multiple steps of wastewater exist, and the discharge amount of the wastewater in the cleaning process is 7-15 times of the volume of a system.
In the existing cleaning technology, a plurality of improved methods such as adding a surfactant in the pickling process or replacing alkaline washing and water washing before pickling with pollution-free hydrogen peroxide cleaning reduce the generation of waste liquid in the cleaning process, but can not reduce the steps of water washing, rinsing and passivating after pickling. The method has the advantages that the degreasing, pickling, phosphating and passivation can be completed in one step by improving a composite cleaning formula based on phosphoric acid, wherein the key point is to replace passivation with phosphating, certain limitations are imposed on certain cleaning fields, and meanwhile, phosphorus-containing cleaning waste liquid cannot be treated in a specific cleaning field, so that the application of the technology is limited.
The EDTA cleaning technology has the advantages that neutral cleaning and passivation can be completed in one step, the amount of waste liquid generated by cleaning can be reduced to 1 time of the volume of a system at least, the waste water amount can be increased to 2-4 times generally for ensuring the quality, and the EDTA cleaning technology has the main defects of high raw material price, high cleaning cost and high cleaning temperature, wherein the cleaning temperature is usually as high as 120-140 ℃ or 70-90 ℃, the EDTA cleaning technology is difficult to meet the chemical cleaning without heating conditions, and the EDTA cleaning technology is limited in the application of the EDTA cleaning technology in the cleaning industry to a certain extent.
A neutral oil and rust removing cleaning agent is also prepared by optimizing the formula of the cleaning agent, for example, the neutral oil and rust removing cleaning agent for matching the production rhythm of pretreatment before coating, which is disclosed by the Chinese patent CN109487285A, comprises the following components in percentage by weight: 5-25% of inorganic salt, 20-40% of organic acid, 5-15% of chelate, 1-5% of surfactant, 0.5-5% of corrosion inhibitor and the balance of water, wherein the organic acid is organic carboxylic acid containing hydroxyl, specifically tartaric acid, citric acid or gluconic acid, and the chelate adopts organic phosphonic acid substances, namely phytic acid or ATMP, EDTMP or HEDP. The cleaning agent is mainly used for the production rhythm of the pretreatment before coating, is mainly used for cleaning parts or a cleaning assembly line, has high rust removal speed, can not avoid the risk of blocking pipeline equipment caused by rapid stripping of scale blocks, can only realize the further completion of degreasing and rust removal, needs further phosphorization (instead of passivation) treatment after cleaning, can not reduce the discharge amount of waste liquid in the cleaning process, contains phosphorus in the waste liquid, and is limited by cleaning site conditions for sewage treatment.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a modified neutral rust removal passivation cleaning agent and a use method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the neutral rust removal passivation cleaning agent comprises a cleaning agent body, and the raw material formula of the cleaning agent body comprises the following components in percentage by weight:
the organic acid is one or a combination of a plurality of oxalic acid, formic acid, malic acid, citric acid, maleic acid, tartaric acid, glycolic acid, lactic acid, glycine and adipic acid, the salt is one or a combination of a plurality of sylvite, sodium salt, ammonium salt and organic ammonium salt, and the chelating agent is an ammonia-carboxyl complexing agent.
In a further embodiment, the complexone is one or a combination of ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), hydroxyethylethylenediaminetriacetic acid (HEDTA), Dihydroxyethylglycine (DEG), cyclohexanediaminetetraacetic acid (CyDTA), diethylenetriaminepentaacetic acid (DTPA), triethylenetetraminehexaacetic acid (TTHA).
In a further embodiment, the inorganic compound is a combination of one or more of sodium carbonate, sodium bicarbonate, potassium hydroxide, sodium hydroxide, aqueous ammonia, ammonium chloride.
In a further embodiment, the surfactant is one or a combination of anionic surfactant and nonionic surfactant.
Preferably, the anionic surfactant can be sodium fatty acid, sodium alkyl (benzene) sulfonate, sodium alkyl sulfate, sodium alkyl phosphonate, etc., and the nonionic surfactant can be fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, alkylolamide, polyoxyethylene alkylamine, etc., and the typical industrial products are JFC, OP-10, TX-10, sodium stearate, sodium palmitate, sodium dodecyl sulfonate, sodium dodecyl sulfate, etc., and the anionic surfactant has functions of activating, wetting, etc., mainly for degreasing or cleaning surfaces in the cleaning process.
In a further embodiment, the corrosion inhibitor is one or a combination of urotropin, thiourea, aniline, quinoline and benzotriazole.
In a further embodiment, the neutral rust removing passivating cleaning agent further comprises a passivating agent.
Preferably, the passivating agent is one or a combination of sodium nitrite, hydrazine hydrate, acetoxime, acetaldoxime and hydrogen peroxide.
Preferably, the adding time of the passivating agent is that the passivating agent is added into the aqueous solution of the cleaning agent body after the cleaned piece is cleaned by the aqueous solution of the cleaning agent body, and the adding mass of the passivating agent accounts for 0.02-2% of the aqueous solution of the cleaning agent body.
In a further embodiment, the preparation method of the cleaning agent body comprises the following steps: according to the formula, an inorganic compound is dissolved in water, and then organic acid or organic acid and salt thereof, a chelating agent, a surfactant and a corrosion inhibitor are added and uniformly stirred to prepare the cleaning agent body.
The pH value of the cleaning agent body is 6.0-8.0, and the density is more than or equal to 1.15g/cm3Which isThe appearance was a pale yellow transparent liquid.
The neutral rust removal passivation cleaning agent is mainly used for chemical cleaning of conventional industrial equipment, is used for cleaning a system or single equipment, and is not suitable for being used for removing rust too fast in order to avoid blockage of a pipeline due to too fast rust removal rate. And the industrial cleaning is usually needed to be neutralized and discharged after one-time use, the rate of the discharged sewage relative to the volume of a system or equipment is a key factor influencing the discharge of the cleaning sewage, and the realization of the cleaning of the industrial equipment at the minimum discharge rate is sometimes a key factor for determining whether chemical cleaning is adopted.
The neutral rust removal passivation cleaning agent is neutral, has small corrosion to equipment made of various materials, can further passivate and further reduce the amount of waste liquid generated in the cleaning process, and reduces the environmental pollution in the cleaning process, wherein the amount of the waste liquid generated in the cleaning process is 1-1.5 times of the capacity of a cleaning system. The cleaning speed of the cleaned piece is slow and uniform, and the risk of scale block stripping and pipeline equipment blockage is reduced.
The other technical scheme adopted by the invention is as follows: the use method of the neutral rust removal passivation cleaning agent further comprises a passivating agent, and the use method comprises the following steps:
(1) cleaning the cleaned piece by using a cleaning solution, wherein the cleaning temperature is 10-60 ℃, and the cleaning time is 4-48 h, and the cleaning solution is a mixed solution of a cleaning agent body and water;
(2) and after cleaning, adding the passivating agent into the cleaning solution to perform passivation treatment.
In a further embodiment, in the step (1), the cleaning agent body accounts for 4-25% of the total weight of the cleaning agent.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the cleaning agent body is prepared by using specific organic acid or a mixture of organic acid and salt thereof, using an ammonia-carboxyl complexing agent as a chelating agent and simultaneously matching with a corrosion inhibitor, an inorganic compound, a surfactant and water, so that the cleaning speed of a cleaned part is slow and uniform, and the risks of scale block stripping and pipeline equipment blockage are greatly reduced. The corrosion to the equipment of various materials is less, and still can further passivate the waste liquid volume that further reduces the cleaning in-process simultaneously, and the waste liquid volume that washs the production is 1~ 1.5 times of cleaning system capacity, reduces the environmental pollution in the cleaning.
When the neutral rust removal passivation cleaning agent is applied, a plurality of steps of alkali washing, acid washing, rinsing and passivation can be combined into one step, and the treatment capacity of a chemical cleaning solution is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of the tower recycle purge of example 4.
Detailed Description
The cleaning agent body used in the neutral rust removal passivation cleaning agent adopts specific organic acid or a mixture of organic acid and salt thereof, takes an ammonia-carboxyl complexing agent as a chelating agent, and is matched with a corrosion inhibitor, an inorganic compound, a surfactant and water for use, and the specific preparation method of the cleaning agent body is that the inorganic compound is dissolved in the water, then the organic acid or the organic acid and the salt thereof, the chelating agent, the surfactant and the corrosion inhibitor are sequentially added, and the mixture is uniformly stirred at normal temperature to 50 ℃.
The technical indexes of the prepared cleaning agent body are shown in table 1, and the performance indexes are shown in table 2.
Table 1 shows the specifications of the cleaning agent body
| Appearance of the product | pH value | Density > g/cm3 |
| Light yellow transparent liquid | 6.0-8.0 | 1.15 |
Table 2 shows the performance indexes of the cleaning agent body
The indices shown in table 2 are under the cleaning conditions: indexes at 40 ℃ for 8 h. The detection of the corrosion rate refers to the standard of GBT 25147 and 2010 industrial equipment chemical cleaning test method gravimetric method for metal corrosion rate and total corrosion.
The cleaning agent body and water are prepared into cleaning solution to clean the cleaned piece, and then the passivating agent can be directly added into the cleaning solution which is cleaned and used to passivate the piece. The cleaned piece can be a pipeline, a wire rod, a plate, steel equipment and complete equipment for surface rust removal, passivation and cleaning before production. The cleaning process can adopt different cleaning processes such as soaking, spraying, circulating and the like according to the structure of the cleaned piece, the surface corrosion degree and the oil stain covering condition.
Generally, under the condition of circular cleaning, the using concentration of a cleaning agent body of the neutral rust removal passivation cleaning agent is 4-25% of the total amount of the cleaning agent in percentage by weight, the using temperature is 10-60 ℃, and the cleaning time is 4-48 h. Specifically, the normal-temperature cleaning time is 24-48 h, the optimal use temperature is 30-50 ℃, and the cleaning time at the optimal use temperature is 4-24 h.
The effects of using the cleaning agent body of the invention in combination with a passivator on removing rust and greasy dirt of various degrees and passivating are shown in table 3.
Table 3 shows the cleaning effect
| Degree of rusting | Light rust | Severe degreeRusting |
| Derusting effect | Is totally produced from | Is totally produced from |
| Degreasing effect > | 98％ | 98％ |
| Passivation effect | Forming a complete passivation film | Forming a complete passivation film |
The detection of the removal effect and the passivation effect in table 3 refers to the standard of the test method for descaling rate and cleaning rate in chemical cleaning of GBT 25148 industrial equipment and the test method for quality of carbon steel passivation film in chemical cleaning of GBT 25149 and 2010 industrial equipment, red dot method.
Through the design, the neutral rust removal passivation cleaning agent has the following advantages:
1) can realize the combination of several steps of alkali washing, acid washing, rinsing and passivation into one step, and the treatment capacity of the chemical cleaning waste liquid is reduced to 1-1.5 times of the water volume of a cleaning system.
2) The neutral cleaning replaces the conventional acidic or weakly acidic cleaning, reduces the corrosion risk in the cleaning process, and improves the applicability of the cleaning agent to various equipment materials.
3) The slow and uniform cleaning speed reduces the risk of scale block stripping and pipeline equipment blockage.
4) Compared with the conventional citric acid cleaning and EDTA cleaning temperatures, the cleaning temperature is further reduced from 120-140 ℃ and 70-90 ℃ to 10-60 ℃, and the requirement on cleaning conditions is improved.
5) Compared with the existing EDTA, the cost of the cleaning agent is further reduced.
6) Compared with the traditional phosphorus four-in-one cleaning agent, the neutral rust removal passivation cleaning agent disclosed by the invention further reduces or even does not contain phosphorus, and the content of harmful substances in waste liquid is reduced.
The present invention is further described in detail by the following specific examples, which are only used to more clearly illustrate the technical solutions of the present invention, but not to limit the scope of the present invention.
Example 1
The formula for preparing 1000kg of the neutral rust-removing passivation cleaning agent body provided by the embodiment is as follows: 150kg oxalic acid, 50kg EDTA, 180kg sodium carbonate, 20kg sodium dodecylbenzenesulfonate, 10kg urotropine and the balance water.
The preparation method comprises the following steps: dissolving sodium carbonate in water, adding oxalic acid, EDTA, sodium dodecyl benzene sulfonate and urotropine, and stirring at normal temperature to obtain yellowish homogeneous liquid with pH of about 7.
Example 2
The formula for preparing 1000kg of the neutral rust-removing passivation cleaning agent body provided by the embodiment is as follows: 80kg tartaric acid, 20kg oxalic acid, 120kg NTA, 130kg sodium hydroxide, 40kg TX-10, 20kg benzotriazole and the balance of water.
The preparation method comprises the following steps: dissolving sodium hydroxide in water, adding oxalic acid, tartaric acid, NTA, TX-10 and benzotriazole, and stirring at room temperature to obtain yellowish uniform liquid with pH of about 7.
Example 3
The formula for preparing 1000kg of the neutral rust-removing passivation cleaning agent body provided by the embodiment is as follows: 100kg glycolic acid, 50kg HEDTA, 150kg ammonia, 30kg JFC, 20kg thiourea and the balance water.
The preparation method comprises the following steps: dissolving ammonia water in water, adding glycolic acid, HEDTA, JFC and thiourea, and stirring at room temperature to obtain yellowish uniform liquid with pH of about 7.
Example 4
In this example, the cleaning agent bulk of example 1 was used to prepare a cleaning solution for circulating cleaning of a pipeline.
Cleaning the object: the new device of a certain factory cleans the steam pipeline of the device before operation, and the dirt in the pipeline is oil dirt, rust dirt and the like.
Volume of the pipeline: 50m3
The material of the pipeline: carbon steel is the main component, and contains a small amount of stainless steel and brass components.
50000kg of cleaning solution was prepared using 5000kg of the cleaning agent body prepared in example 1 and 45000kg of water.
The cleaning method comprises the following steps: cleaning at normal temperature for 36h, adding sodium carbonate to adjust pH of the cleaning solution to above 8.0 after cleaning the pipe section, adding sodium nitrite 500kg to passivate for 6h, wherein the metal surface is in metal natural color to form uniform passivation film, and dripping copper sulfate for a certain period>5s, corrosion rates of carbon steel, stainless steel and brass were 0.84g/m2·h、0.05g/m2·h、0.12g/m2H, the waste liquor containing the medicament is discharged in the cleaning process by 50m3。
Example 5
In this example, the cleaning agent body of example 2 was used to prepare a cleaning solution circulating spray tower.
Cleaning the object: the tower is cleaned before the production of a chemical enterprise, and the body constitution of the tower body is carbon steel.
18000kg of cleaning solution was prepared using 1500kg of the cleaning solution prepared in example 2 and 16500kg of water.
The cleaning method comprises the following steps:
set up belt cleaning device as shown in figure 1, including the tower 1 that needs to be washd, washing tank 2 and circulating pump 3, set up washing liquid feed liquor pipe 4 between the top of the tower of tower 1 and washing tank 2, set up circulating pump 3 on feed liquor pipe 4, set up fluid-discharge tube 5 between the tower bottom of tower 1, downside portion and washing tank 2.
Adding a cleaning agent body and water into a cleaning tank 2 to be mixed to prepare cleaning solution, introducing steam into the cleaning tank 2 to heat the cleaning solution, heating to 40 ℃, then adopting two circulating pumps 3 to circulate the cleaning solution in the cleaning tank 2 to the top of a tower 1 to spray and clean for 18 hours, discharging half of the cleaning solution in the cleaning tank 2 after cleaning, then adding 75kg of passivating agent (hydrogen peroxide) into the cleaning tank 2, then adding ammonia water to adjust the pH value to be more than 8.0, and continuing to perform pH adjustment to obtain the cleaning solutionCirculating for 6h, discharging the cleaning solution, wherein the amount of waste liquid discharged in the cleaning process is 1.5 times (27 m) of that of the cleaning solution3) Considering the actual water volume of the tower of about 90m3The amount of the discharged waste liquid is 0.3 times of the volume of the tower system, the surface of the tower is observed to be in the natural color of metal, the tower is not rusted after being placed for 10 days, and the corrosion rate of the carbon steel is 0.65g/m determined by the corrosion of site hanging pieces2·h。
Comparative example 1
In the embodiment, a cleaning solution circulating spray tower is prepared by adopting conventional alkali washing, acid washing, rinsing and passivating.
Cleaning the object: the tower is cleaned before the production of a chemical enterprise, and the body constitution of the tower body is carbon steel.
The cleaning method comprises the following steps:
set up belt cleaning device as shown in figure 1, including the tower 1 that needs to be washd, washing tank 2 and circulating pump 3, set up washing liquid feed liquor pipe 4 between the top of the tower of tower 1 and washing tank 2, set up circulating pump 3 on feed liquor pipe 4, set up fluid-discharge tube 5 between the tower bottom of tower 1, downside portion and washing tank 2.
Alkaline washing and subsequent water washing: 90kg of sodium hydroxide, 90kg of sodium carbonate and 90kg of trisodium phosphate are dissolved in water to 18m3Heating to 60-80 deg.C, circularly cleaning for 6-16h, washing with water after neutralization and discharge about three times of the volume of spray water, and discharging 72m of waste liquid containing water3。
Acid washing and water washing after acid washing: 1800 plus hydrochloric acid 3000kg, lan-826 corrosion inhibitor 50kg, water is added to dissolve the mixture to 18m3The water is circularly cleaned for 4-8h at normal temperature or heated to 50 ℃, the volume of the water sprayed after neutralization and discharge is about three times that of the water sprayed, and the discharge amount of waste water containing water is 72m3。
Rinsing and passivating: 30-70kg of citric acid and 10kg of lan-826 corrosion inhibitor are dissolved in water to 18m3Heating to 60-80 ℃, circularly cleaning for 2-4h, adding ammonia water to adjust the pH value of 9-10, adding 180kg of passivating agent sodium nitrite, passivating for 4-6h, adjusting the pH value to be less than 9 and discharging the waste liquid with the discharge amount being one time of the volume of the spray water, namely the discharge amount of the waste liquid being 18m3。
The volume of the waste liquid discharged in the whole cleaning process is 9 times (162 m) of the volume of the spray cleaning water3) Considering the actual water volume of the tower of about 90m3The amount of the discharged waste liquid is 1.8 times of the volume of the tower system, the surface of the tower is observed to be in the natural color of metal, the tower is not rusted after being placed for 10 days, and the corrosion rate of the carbon steel is 2.32g/m when the acid washing is measured by the corrosion of a hanging piece on site2H, the total cleaning process effluent discharge was six times that of cleaning example 5.
Comparative example 2
The present embodiment employs a low temperature EDTA recycle spray tower.
Cleaning the object: the tower is cleaned before the production of a chemical enterprise, and the body constitution of the tower body is carbon steel.
18000kg of cleaning solution is prepared by adding 1080kg of EDTA disodium, 90kg of EDTA corrosion inhibitor and 16830kg of water.
The cleaning method comprises the following steps:
set up belt cleaning device as shown in figure 1, including the tower 1 that needs to be washd, washing tank 2 and circulating pump 3, set up washing liquid feed liquor pipe 4 between the top of the tower of tower 1 and washing tank 2, set up circulating pump 3 on feed liquor pipe 4, set up fluid-discharge tube 5 between the tower bottom of tower 1, downside portion and washing tank 2.
Adding a cleaning agent body and water into a cleaning tank 2 to be mixed to prepare cleaning solution, introducing steam into the cleaning tank 2 to heat the cleaning solution, heating to 80 ℃, then adopting two circulating pumps 3 to spray and clean the cleaning solution circulating pump in the cleaning tank 2 to the top of a tower 1 for 10-24h, then adding ammonia water to adjust the pH value to be more than 8.0-10, continuing circulating for 6h, discharging the cleaning solution, and discharging waste liquid 1 time (18 m) of the cleaning solution in the cleaning process3) Considering the actual water volume of the tower of about 90m3The amount of the discharged waste liquid is 0.2 times of the volume of the tower system, if the 1 time of water is further washed, the amount of the waste liquid is doubled, the surface of the tower is observed to be in the natural color of metal, the tower is not rusted after being placed for 10 days, and the corrosion rate of the carbon steel is 0.84g/m determined by the corrosion of site hanging pieces2H, the amount of waste water is similar to that of cleaning example 4, but the major disadvantage is the high cost and the need to heat to higher temperatures.
The corrosion rates in examples 4-5 and comparative examples 1-2 were determined using GBT 25147-.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The neutral rust removal passivation cleaning agent comprises a cleaning agent body and is characterized in that the cleaning agent body comprises the following components in percentage by weight:
5-25% of organic acid or a mixture of organic acid and salt thereof;
2.5-25% of a chelating agent;
6-25% of an inorganic compound;
0.2-5% of a surfactant;
0.2-2% of corrosion inhibitor;
the balance of water;
the organic acid is one or a combination of a plurality of oxalic acid, formic acid, malic acid, citric acid, maleic acid, tartaric acid, glycolic acid, lactic acid, glycine and adipic acid, the salt is one or a combination of a plurality of sylvite, sodium salt, ammonium salt and organic ammonium salt, and the chelating agent is an ammonia-carboxyl complexing agent.
2. The neutral rust removing and passivating cleaning agent as claimed in claim 1, which is characterized in that: the complexone is one or more of ethylenediamine tetraacetic acid, nitrilotriacetic acid, hydroxyethyl ethylenediamine triacetic acid, dihydroxyethyl glycine, cyclohexanediamine tetraacetic acid, diethylenetriamine pentaacetic acid, and triethylenetetramine hexaacetic acid.
3. The neutral rust removing and passivating cleaning agent as claimed in claim 1, which is characterized in that: the inorganic compound is one or more of sodium carbonate, sodium bicarbonate, potassium hydroxide, sodium hydroxide, ammonia water and ammonium chloride.
4. The neutral rust removing and passivating cleaning agent as claimed in claim 1, which is characterized in that: the surfactant is one or a combination of more of anionic surfactant and nonionic surfactant.
5. The neutral rust removing and passivating cleaning agent as claimed in claim 1, which is characterized in that: the corrosion inhibitor is one or a combination of more of urotropin, thiourea, aniline, quinoline and benzotriazole.
6. The neutral rust removing and passivating cleaning agent as claimed in claim 1, which is characterized in that: the neutral rust removal passivation cleaning agent also comprises a passivating agent.
7. The neutral rust removing and passivating cleaning agent as claimed in claim 6, which is characterized in that: the passivating agent is one or a combination of more of sodium nitrite, hydrazine hydrate, acetoxime, acetaldoxime and hydrogen peroxide.
8. The neutral rust removing and passivating cleaning agent as claimed in claim 6, which is characterized in that: the adding time of the passivating agent is that the passivating agent is added into the aqueous solution of the cleaning agent body after the cleaned piece is cleaned by the aqueous solution of the cleaning agent body.
9. The use method of the neutral rust removal passivation cleaning agent as claimed in any one of claims 1 to 5, characterized in that the neutral rust removal passivation cleaning agent further comprises a passivating agent, and the use method comprises the following steps:
(1) cleaning the cleaned piece by using a cleaning solution, wherein the cleaning temperature is 10-60 ℃, and the cleaning time is 4-48 h, and the cleaning solution is a mixed solution of a cleaning agent body and water;
(2) and after cleaning, adding the passivating agent into the cleaning solution to perform passivation treatment.
10. The use method of the neutral rust removal passivation cleaning agent as claimed in claim 9, characterized in that: in the step (1), the cleaning agent body accounts for 4-25% of the total weight of the cleaning agent, and the adding mass of the passivating agent accounts for 0.02-2% of the total weight of the cleaning agent.
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| CN111441055A (en) * | 2020-04-24 | 2020-07-24 | 胡超红 | Metal antirust agent |
| CN111926339A (en) * | 2020-07-29 | 2020-11-13 | 甘肃泰升化工科技有限公司 | Chemical stainless steel cleaning agent and preparation method thereof |
| CN111926338A (en) * | 2020-07-14 | 2020-11-13 | 苏州绿水清洗科技有限公司 | Stainless steel cleaning passivator and application thereof |
| CN113699000A (en) * | 2021-08-24 | 2021-11-26 | 福达合金材料股份有限公司 | Cleaning agent for removing stains on surface of rivet electrical contact and application of cleaning agent |
| CN114196962A (en) * | 2021-10-29 | 2022-03-18 | 浙江众为环保材料有限公司 | Neutral rust removing liquid and rust removing method |
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| CN111441055B (en) * | 2020-04-24 | 2022-03-22 | 明光猛将消防设备有限公司 | Spraying device for spraying metal antirust agent |
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| CN111926339A (en) * | 2020-07-29 | 2020-11-13 | 甘肃泰升化工科技有限公司 | Chemical stainless steel cleaning agent and preparation method thereof |
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| CN114196962B (en) * | 2021-10-29 | 2023-11-21 | 浙江万众新材料有限公司 | Neutral rust removing liquid and rust removing method |
| 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 |
| 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 |
| CN115386434A (en) * | 2022-07-14 | 2022-11-25 | 广州市人和清洗有限公司 | Bi-component cleaning agent for cleaning pipeline and preparation method thereof |
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