CN101805067A - Phosphorus-free green composite corrosion and scale inhibitor - Google Patents
Phosphorus-free green composite corrosion and scale inhibitor Download PDFInfo
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- CN101805067A CN101805067A CN200910046244A CN200910046244A CN101805067A CN 101805067 A CN101805067 A CN 101805067A CN 200910046244 A CN200910046244 A CN 200910046244A CN 200910046244 A CN200910046244 A CN 200910046244A CN 101805067 A CN101805067 A CN 101805067A
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- phosphorus
- scale inhibitor
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- green composite
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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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/105—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances combined with inorganic substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
- C02F5/125—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen combined with inorganic substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
Abstract
The invention discloses a phosphorus-free green composite corrosion and scale inhibitor, which comprises polyaspartic acid or polyepoxysuccinic acid, maleic acid homopolymers, acrylic copolymers, inorganic zinc salt, an ECH inhibition synergist and water. The ECH inhibition synergist is mixture of lanthanum nitrate and sodium gluconate mixed according to a mass ratio of 1:10-1:5. The phosphorus-free green composite corrosion and scale inhibitor of the invention is phosphorus-free, non-toxic and highly biodegradable, and not only can overcome the defects of water body eutrophication and high toxicity caused by water treatment agents containing phosphorus, chromium, nitrite and the like, but also can be used for treatment of corrosive water with low alkalinity and low concentration and can satisfy the requirements of circulating water with high temperature, high alkalinity, high hardness and high pH value at present. Moreover, the invention is a multifunctional security and environmental protection type water treatment agent with a function of inhibiting both corrosion and scale.
Description
Technical field
The present invention relates to a kind of phosphorus-free green composite corrosion and scale inhibitor.
Background technology
Water is Source of life, is the necessary important chemical substance of human survival.Along with expanding economy and Increase of population, the crisis that water resources shortage presented is more and more serious.In order to protect the Freshwater resources of worsening shortages, on the one hand, extensive desalination technology can provide a large amount of fresh water for the mankind; Be exactly water saving on the other hand, particularly in the huge industrial production of water loss, adopt efficient Stability Technique of Water Quality to become the only way of water saving.Aspect water-saving technology, exploitation is applicable to that the multi-functional water quality stablizer of high concentration multiple is the most effective water saving approach the most direct.
From early 1970s, be since water conditioner is found and is applied to industrial circulating water from phosphorus because it is nontoxic, at a low price and have good corrosion and scale inhibition performance, in water treatment, still account for leading status at present.On the one hand, it has made huge contribution for the corrosion and the scale problems that solve the industrial cycle water system, has brought great riches to society.On the other hand, can bring a large amount of P contained compounds to trade effluent, cause the eutrophication of water body because phosphorus is water conditioner, unfriendly to environment.More and more higher so that study a kind of cry of efficient, low-phosphorous or without phosphorus environment-friendly type water treatment agent.The country that has has in the world made strict restriction to the discharging of phosphorus, and for example Germany has required the discharging≤1mg/L of phosphorus.China has also formulated strict standard to the discharging of phosphorus, the GB18918-2002 regulation, and one-level A standard is total phosphorus≤0.5mg/L, one-level B standard is total phosphorus≤1.0mg/L.
Poly-epoxy succinic acid (PESA) and poly aspartic acid (PASP) are a kind of water-soluble polymerss with powerful chelating and scale inhibition performance, and be not phosphorous in the molecular structure, can not cause body eutrophication, and biodegradable is good, is a kind of green polymer.United States Patent (USP) report in 1993, the low-phosphorous prescription of forming by phosphonate, azole compounds, PESA and acrylic copolymer, can reduce the pollution [Method of inhibiting corrosion in aqueous systems (US5,256,332)] of phosphorus series compound to environment; [US 5 for United States Patent (USP) " Methods of controlling scale formation in aqueous systems ", 248,438 (BetzDearborn Inc., 1993)] and United States Patent (USP) " Compositions for controlling scale formation in aqueous system " [US 5,342,540 (1994)] provide the composite scale-inhibiting corrosion inhibitor that constitutes by PESA, acrylic copolymer and lanthanide ion; United States Patent (USP) " Calcium carbonate scale controlling method " [US 5,562,830 (1996)] has been invented a kind of corrosion inhibiting and descaling agent of being made up of PESA and phosphine carboxylic acid; Huo Yu in 2000 coagulates and waits people [Huo Yuning, Liu Shan, Lu Zhu. the research of novel water conditioner poly aspartic acid. East China Li worker's college journal, 2000.26 (3) 298～300] environment-friendly dirt dispersion agent poly aspartic acid is reported, has been developed a kind of corrosion inhibiting and descaling agent of forming by PASP, Sunmorl N 60S, tungstate and zinc salt; Domestic patent " a kind of usefulness contains the corrosion-mitigation scale-inhibition water treatment method of poly-epoxy succinic acid " [CN1609020 (2003)] has been developed a kind of compound water treating corrosion and scale inhibitor of being made up of PESA, Sunmorl N 60S and zinc salt, is a kind of eco-friendly corrosion inhibiting and descaling agent.
Though disclosed these patents all belong to the environmental type water conditioner, part contains the phosphine carboxylic acid, easily causes the water quality eutrophication.Some water conditioner contains tungstate and lanthanide series compound, though corrosion mitigating effect is good, because tungstate compound is on the high side, has hindered the promotion and application of environment-friendly type water treatment agent.
In general, the cycles of concentration of recirculated water is high more, the easy more fouling of system, and not perishable; On the contrary, cycles of concentration is low more, and system is perishable more, and is not easy fouling.Above-mentioned environment-friendly type water treatment agent range of application is narrow, can only be applied in high rigidity, high basicity and high concentration multiple, in the uncorruptible condition of water quality.
Summary of the invention
Technical problem to be solved by this invention has been to overcome the shortcoming that existing water conditioner cost height, range of application are narrow, be not suitable for perishable water quality, by dirt dispersion agent and inhibiter is composite, utilize the mutual synergistic effect of each component, thereby the water conditioner that a kind of nontoxic, phosphorus-free green, cost are low, have good inhibition and scale effect is provided.
The invention provides a kind of phosphorus-free green composite corrosion and scale inhibitor, it contains following compositions: poly aspartic acid or poly-epoxy succinic acid, toxilic acid homopolymer, acrylic copolymer, inorganic zinc salt, ECH inhibition synergistic agent and water; Described ECH inhibition synergistic agent is the mixture that lanthanum nitrate and Sunmorl N 60S are formed according to 1: 10～1: 5 mass ratio.
Wherein, when the pending aqueous solution is easy fouling water quality, use poly aspartic acid, what its content was preferable is the pending aqueous solution of 10-30mg/1L; When the pending aqueous solution is perishable water quality, use poly-epoxy succinic acid, what its content was preferable is the pending aqueous solution of 5-30mg/1L.
The homopolymer of described toxilic acid homopolymer for obtaining by the maleic anhydride monomer polymerization, preferable is polymaleic acid (PMA) and/or hydrolyzed polymaleic anhydride (HPMA), better is hydrolyzed polymaleic anhydride.What the content of toxilic acid homopolymer was preferable is the pending aqueous solution of 2-10mg/1L.
Described acrylic copolymer is the polymkeric substance that Acrylic Acid Monomer and other unsaturated compound copolymerization make, and preferable is acrylic acid or the like copolymer and/or acrylic acid terpolymer; What described acrylic acid or the like copolymer was preferable is the multipolymer (HPA) of vinylformic acid (AA) and Propylene glycol monoacrylate, and/or the multipolymer of vinylformic acid and 2-methyl-2 '-acrylamido propane sulfonic acid (AMPS); What described acrylic acid terpolymer was preferable is the multipolymer of vinylformic acid, Propylene glycol monoacrylate and methyl acrylate (MA), and/or the multipolymer of vinylformic acid, methyl acrylate and 2-methyl-2 '-acrylamido propane sulfonic acid.What the content of described acrylic copolymer was preferable is the pending aqueous solution of 2-15mg/1L.
Described inorganic zinc salt be can ionization in water go out zine ion contain the zinc mineral compound, preferable is Zinc Sulphate Heptahydrate and/or zinc chloride, what the concentration of zine ion was preferable is the pending aqueous solution of 0.5-3.5mg/1L.
Described ECH inhibition synergistic agent can effectively promote the corrosion inhibition of water conditioner.What the content of ECH inhibition synergistic agent was preferable is the pending aqueous solution of 2-10mg/1L.
When the pending aqueous solution is in the copper material system, during as use copper material equipment in recirculating cooling water system, also can contain copper inhibitor in the phosphorus-free green composite corrosion and scale inhibitor of the present invention.Described copper inhibitor is the reagent of the conventional energy inhibition copper that uses in this area, and preferable is azole compounds, and better is benzotriazole and/or methyl benzotriazazole, and best is benzotriazole.What the content of copper inhibitor was preferable is the pending aqueous solution of 0.5-2mg/1L.
Positive progressive effect of the present invention is:
1. phosphorus-free green composite corrosion and scale inhibitor of the present invention can be applied in low cycles of concentration, the perishable condition of water quality, and its corrosion mitigating effect is far superior to other environment-friendly type medicaments;
2. phosphorus-free green composite corrosion and scale inhibitor of the present invention avoids using expensive tungstate, greatly reduces cost;
3. do not contain materials such as phosphine carboxylic acid, chromium system, nitrous acid system in the phosphorus-free green composite corrosion and scale inhibitor of the present invention, overcome shortcomings such as body eutrophication that existing water conditioner brings and toxicity height, environmental pollution is little.
Embodiment
Further specify the present invention with embodiment below, but the present invention is not limited.
" tosca method " and " rotary hanging plate weight-loss method " carries out static-state scale inhibition test and rotary hanging plate corrosion test in " water coolant analysis and the test method " that embodiment 1～7 all writes according to China PetroChemical Corporation (1993, general petrochemical works, Anqing information center publishes).In " rotary hanging plate weight-loss method ", 45 ℃ of test temperatures, 75 rev/mins of test piece rotating speeds (rpm), test period 72h.Embodiment 1-3,5 lacing film material is a carbon steel, and embodiment 4,6, and 7 lacing film material is a brass.Test sees Table 1 with hanging down cycles of concentration, perishable water quality:
Table 1 test water quality
| Water-quality guideline | ??Ca 2+ | Total alkalinity | Total hardness | ??Cl - | ??SO 4 2- | ??pH | Specific conductivity |
| Concentration | ??200 | ??70 | ??238 | ??134 | ??20 | ??7.97 | ??1040 |
Annotate: specific conductivity is μ S/cm, and its counit is mg/L, Ca
2+, total alkalinity, total hardness be all with CaCO
3Meter, down together.Ca
2+Represent calcium hardness, down together.
" water coolant analysis and the test method " that water quality analysis method and corrosion inhibition rate, scale inhibition performance method of calculation are write with reference to China PetroChemical Corporation
The mass ratio of lanthanum nitrate and Sunmorl N 60S is 1: 8 in the ECH inhibition synergistic agent that uses among following each embodiment, by the whole dosage of control ECH inhibition synergistic agent, controls the dosage of lanthanum nitrate and Sunmorl N 60S.
Embodiment 1
1. preparation contains the composite slow-corrosion scale resistor 100g of poly-epoxy succinic acid
The composite slow-corrosion scale resistor prescription: poly-epoxy succinic acid (PESA) 20g, hydrolyzed polymaleic anhydride (HPMA) 10g, vinylformic acid/Propylene glycol monoacrylate multipolymer (AA/HPA) 15g, ECH inhibition synergistic agent 5g, Zinc Sulphate Heptahydrate 15g, deionized water 35g shakes up, promptly.
2. add in test water with the drug concentration of the medicament for preparing by 100mg/L, the effective concentration that contains PESA, HPMA, AA/HPA, ECH inhibition synergistic agent and Zinc Sulphate Heptahydrate in the water is respectively 20mg/L, 10mg/L, 15mg/L, 5mg/L and 15mg/L.Recording the carbon steel corrosion inhibition rate is 96.8%, is 90.3% to the lime carbonate scale inhibition performance.
Embodiment 2
1. preparation contains the composite slow-corrosion scale resistor 100g of poly aspartic acid
Composite slow-corrosion scale resistor prescription: poly aspartic acid (PASP) 30g, hydrolyzed polymaleic anhydride (HPMA) 5g, vinylformic acid/2-methyl-2 '-acrylamido propane sulfonic acid multipolymer (AA/AMPS) 15g, ECH inhibition synergistic agent 8g, Zinc Sulphate Heptahydrate 10g, deionized water 32g, shake up, promptly.
2. when adding in test water by the drug concentration of 100mg/L with the medicament for preparing, the effective concentration that contains PASP, HPMA, AA/AMPS, ECH inhibition synergistic agent and Zinc Sulphate Heptahydrate in the water is respectively 30mg/L, 5mg/L, 15mg/L, 8mg/L and 10mg/L.Recording the carbon steel corrosion inhibition rate is 98.3%, is 94.7% to the lime carbonate scale inhibition performance.
Embodiment 3
1. preparation contains the composite slow-corrosion scale resistor 100g of poly-epoxy succinic acid
Composite slow-corrosion scale resistor prescription: poly-epoxy succinic acid (PESA) 20g, hydrolyzed polymaleic anhydride (HPMA) 10g, vinylformic acid/2-methyl-2 '-acrylamido propane sulfonic acid multipolymer (AA/AMPS) 10g, ECH inhibition synergistic agent 8g, Zinc Sulphate Heptahydrate 12g, deionized water 40g, shake up, promptly.
2. when adding in test water by the drug concentration of 100mg/L with the medicament for preparing, the effective concentration that contains PESA, HPMA, AA/AMPS, ECH inhibition synergistic agent, Zinc Sulphate Heptahydrate in the water is respectively 20mg/L, 10mg/L, 10mg/L, 8mg/L and 12mg/L.Recording the carbon steel corrosion inhibition rate is 92.5%, is 90.7% to the lime carbonate scale inhibition performance.
Embodiment 4
1. preparation contains the composite slow-corrosion scale resistor 100g of poly aspartic acid
Composite slow-corrosion scale resistor prescription: poly aspartic acid (PASP) 30g, hydrolyzed polymaleic anhydride (HPMA) 10g, vinylformic acid/Propylene glycol monoacrylate multipolymer (AA/HPA) 15g, ECH inhibition synergistic agent 8g, Zinc Sulphate Heptahydrate 10g, benzotriazole (BTA) 1g, deionized water 24g shakes up, promptly.
2. when adding in test water by the drug concentration of 100mg/L with the medicament for preparing, the effective concentration that contains PASP, HPMA, AA/HPA, ECH inhibition synergistic agent, Zinc Sulphate Heptahydrate and BTA in the water is respectively 30mg/L, 10mg/L, 15mg/L, 8mg/L, 10mg/L and 1mg/L.Recording the brass corrosion inhibition rate is 95.8%, is 92.7% to the lime carbonate scale inhibition performance.
Embodiment 5
1. preparation contains the composite slow-corrosion scale resistor 100g of poly-epoxy succinic acid
Composite slow-corrosion scale resistor prescription: poly-epoxy succinic acid (PESA) 30g, hydrolyzed polymaleic anhydride (HPMA) 2g, vinylformic acid/Propylene glycol monoacrylate/methyl acrylate copolymer 2g, ECH inhibition synergistic agent 10g, Zinc Sulphate Heptahydrate 2.2g, deionized water 53.8g, shake up, promptly.
2. when adding in test water by the drug concentration of 100mg/L with the medicament for preparing, the effective concentration that contains PESA, HPMA, HA/HPA/MA, ECH inhibition synergistic agent, Zinc Sulphate Heptahydrate in the water is respectively 30mg/L, 2mg/L, 2mg/L, 10mg/L and 2.2mg/L.Recording the carbon steel corrosion inhibition rate is 85.39%, is 90.17% to the lime carbonate scale inhibition performance.
Embodiment 6
1. preparation contains the composite slow-corrosion scale resistor 100g of poly-epoxy succinic acid
Composite slow-corrosion scale resistor prescription: poly-epoxy succinic acid (PESA) 5g, hydrolyzed polymaleic anhydride (HPMA) 10g, vinylformic acid/methyl acrylate/2-methyl-2 '-acrylamido propane sulfonic acid copolymer 1 5g, ECH inhibition synergistic agent 2g, Zinc Sulphate Heptahydrate 13g, methyl benzotriazazole 2g, deionized water 53g, shake up, promptly.
2. when adding in test water by the drug concentration of 100mg/L with the medicament for preparing, the effective concentration that contains PESA, HPMA, AA/HPA/AMPS, ECH inhibition synergistic agent, Zinc Sulphate Heptahydrate and BTA in the water is respectively 5mg/L, 10mg/L, 15mg/L, 2mg/L, 13mg/L and 2mg/L.Recording the brass corrosion inhibition rate is 90.11%, is 85.42% to the lime carbonate scale inhibition performance.
Embodiment 7
1. preparation contains the composite slow-corrosion scale resistor 100g of poly aspartic acid
Composite slow-corrosion scale resistor prescription: poly aspartic acid (PASP) 10g, hydrolyzed polymaleic anhydride (HPMA) 10g, vinylformic acid/Propylene glycol monoacrylate multipolymer (AA/HPA) 5g, vinylformic acid/Propylene glycol monoacrylate/methyl acrylate copolymer 10g, ECH inhibition synergistic agent 8g, Zinc Sulphate Heptahydrate 10g, benzotriazole (BTA) 0.5g, deionized water 46.5g shakes up, promptly.
2. when adding in test water by the drug concentration of 100mg/L with the medicament for preparing, the effective concentration that contains PASP, HPMA, AA/HPA, HA/HPA/MA, ECH inhibition synergistic agent, Zinc Sulphate Heptahydrate and BTA in the water is respectively 10mg/L, 10mg/L, 5mg/L, 10mg/L, 8mg/L, 10mg/L and 0.5mg/L.Recording the brass corrosion inhibition rate is 86.71%, is 93.62% to the lime carbonate scale inhibition performance.
Claims (13)
1. phosphorus-free green composite corrosion and scale inhibitor, it contains poly aspartic acid or poly-epoxy succinic acid, toxilic acid homopolymer, acrylic copolymer, inorganic zinc salt, ECH inhibition synergistic agent and water; Described ECH inhibition synergistic agent is the mixture that lanthanum nitrate and Sunmorl N 60S are formed according to 1: 10～1: 5 mass ratio.
2. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 1 is characterized in that: the content of described poly aspartic acid is the pending aqueous solution of 10-30mg/1L; The content of described poly-epoxy succinic acid is the pending aqueous solution of 5-30mg/1L.
3. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 1 is characterized in that: described toxilic acid homopolymer is polymaleic acid and/or hydrolyzed polymaleic anhydride.
4. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 1 is characterized in that: the content of described toxilic acid homopolymer is the pending aqueous solution of 2-10mg/1L.
5. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 1 is characterized in that: described acrylic copolymer is acrylic acid or the like copolymer and/or acrylic acid terpolymer.
6. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 5, it is characterized in that: described acrylic acid or the like copolymer is the multipolymer of vinylformic acid and Propylene glycol monoacrylate, and/or the multipolymer of vinylformic acid and 2-methyl-2 '-acrylamido propane sulfonic acid; Described acrylic acid terpolymer is the multipolymer of vinylformic acid, Propylene glycol monoacrylate and methyl acrylate, and/or the multipolymer of vinylformic acid, methyl acrylate and 2-methyl-2 '-acrylamido propane sulfonic acid.
7. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 1 is characterized in that: the content of described acrylic copolymer is the pending aqueous solution of 2-15mg/1L.
8. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 1 is characterized in that: described inorganic zinc salt is Zinc Sulphate Heptahydrate and/or zinc chloride.
9. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 1 is characterized in that: the concentration of zine ion is the pending aqueous solution of 0.5-3.5mg/1L in the described inorganic zinc salt.
10. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 1 is characterized in that: the content of described ECH inhibition synergistic agent is the pending aqueous solution of 2-10mg/1L.
11. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 1 is characterized in that: described phosphorus-free green composite corrosion and scale inhibitor also contains copper inhibitor.
12. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 11 is characterized in that: described copper inhibitor is benzotriazole and/or methyl benzotriazazole.
13. phosphorus-free green composite corrosion and scale inhibitor as claimed in claim 11 is characterized in that: the content of described copper inhibitor is the pending aqueous solution of 0.5-2mg/1L.
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