CN1706759A - Scale and corrosion inhibitor for continuous casting soft water and steel making soft water system - Google Patents
Scale and corrosion inhibitor for continuous casting soft water and steel making soft water system Download PDFInfo
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- CN1706759A CN1706759A CN 200410025022 CN200410025022A CN1706759A CN 1706759 A CN1706759 A CN 1706759A CN 200410025022 CN200410025022 CN 200410025022 CN 200410025022 A CN200410025022 A CN 200410025022A CN 1706759 A CN1706759 A CN 1706759A
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- molybdate
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Abstract
The present invention belongs to the field of water treating technology, and is especially scale and corrosion inhibitor for continuous casting soft water and steel making soft water system. The scale and corrosion inhibitor is re-compounded with molybdate 2-40 wt%, organic phosphate 1-30 wt%, copolymer 1-30 wt% and deionized water the rest. The scale and corrosion inhibitor of the present invention has high use effect, high environment tolerance, high scale and corrosion inhibiting effect and other advantages.
Description
Technical field:
The invention belongs to water-treatment technology field, particularly a kind of continuous casting soft water, steel-making soft water system corrosion inhibiting and descaling agent.
Background technology:
Often be easy to generate various corrosion phenomenons in the circulating water system, the reason of its generation is:
1) oxygen corrosion
Because the system that medicament uses is semi-open-type or open-type cooling water system, so the oxygen level in the water is fully saturated.Oxygen in the water becomes the depolarizer of cathodic process in corrosion process, can produce a series of oxygen uptake corrosion at steel surface.
Anodic reaction
〔1〕
Cathodic reaction
Below then be main electrochemical process, but after above process, also can recur following reaction:
As long as steel surface touches the WATER AS FLOW MEDIUM that contains dissolved oxygen, above reaction then can go on by successive.
2) carbon dioxide corrosion
In process of cooling, it is saturated that the carbonic acid gas in the WATER AS FLOW MEDIUM is tending towards more.Specific conductivity in the water is risen greatly, and corrodibility also is tending towards strengthening.
In water, free CO2 can cause the problem of carbonate equilibrium, and its reaction formula is as follows:
Carbonic acid gas in the water is many more, the H of generation
+Many more, big more to the destruction of steel surface protective membrane.
3) microbiological effect
The microorganism that enters system is mainly from two aspects: the one, and water needs to introduce a large amount of air in process of cooling, and microorganism also enters circulating cooling system thereupon.The 2nd, the make up water of cooling water system also microorganism can be brought in the system more or less.The envrionment conditions of cooling circulating water system comparatively is fit to microorganism growth.
When having foundry loam to adhere on the metallic surface, not only heat exchange effect descends, and dissolved oxygen is difficult to diffusion below it, forms local anode; Contact more foundry loam peripheral part with dissolved oxygen and be negative electrode.Local corrosion (spot corrosion) often takes place in the foundry loam below in this case.
In the water that contains more irony and carbonic acid gas, iron bacteria can breed in a large number simultaneously, and they can be high ferro with the ferrous oxidation that cell absorbed, thereby obtain energy, and its reaction formula is as follows:
After Fe (OH) 3 formed, this amounts of insoluble iron compound will precipitate after discharging thalline, forms a large amount of brown foundry loams, and formed the rust knurl on the carbon steel tube wall, caused a large amount of spot corrosion.
When iron bacteria bred in a large number, the system water turbidity can raise greatly, and iron level increases, and the brown precipitate deposits yields is arranged in the system.
The airtight circulating cooling system make up water generally all is with softening water or pure water, and is big at the equipment intensity of heat exchange, to preventing under the demanding situation of fouling that the result of use of some conventional inhibiter (phosphorus system etc.) is very poor.The pure water that uses, soft water corrodibility are than general industry make up water stronger (R.S.I.＞10), therefore in actually operating, usually use the host of the inorganic inhibitor (as dichromate, nitrite) of some strong oxidizing properties as whole water quality stabilizer, but these medicaments are owing to exist the defective of environment tolerable difference, although its result of use is good, Financial cost is low, still inevitably is faced with superseded.
Summary of the invention:
The present invention will solve the technical problem of Phosphorus inhibiter result of use difference and some strong oxidizing property inorganic inhibitors (as dichromate, nitrite) environment tolerance difference in existing continuous casting soft water, the steel-making soft water system, a kind of continuous casting soft water, steel-making soft water system corrosion inhibiting and descaling agent are provided, it with inhibition, scale inhibition effect is good and advantage such as environmental protection.
For solving the problems of the technologies described above, the present invention is achieved in that
A kind of continuous casting soft water, steel-making soft water system corrosion inhibiting and descaling agent is characterized in that: form by molybdate, organophosphate and multipolymer are composite, its weight percent composition is, molybdate 2-40%, organophosphate 1-30%, copolymer 1-30%, deionized water surplus.
This molybdate is one or more in Sodium orthomolybdate or the potassium molybdate; This organophosphate is one or more of PBTCA or HEDP; This multipolymer is one or more of PAA or PAAS.
Its weight percent composition is molybdate 5-30%, organophosphate 5-30%, copolymer 1-30%, deionized water surplus.
This product is a kind of compound with inhibition and scale-inhibiting properties, is to form by molybdate, organic phosphonate and co-polymer of sulfonate are composite, and molybdate is a kind of anodic oxidation type inhibiter, and low toxicity.Organic phosphine moves under comparatively high temps not can hydrolysis, and the residence time is long.This product is easy to use, and is simple to operate, and can be widely used in industries such as oil, chemical industry, metallurgy, weaving is the inclosed recirculated cooling water treatment system of medium with softening water, pure water, also can be used for the open type Water Treatment in Circulating Cooling System.
Embodiment:
A kind of continuous casting soft water, steel-making soft water system corrosion inhibiting and descaling agent form by molybdate, organophosphate and multipolymer are composite, and its weight percent composition is molybdate 2-40%, organophosphate 1-30%, copolymer 1-30%, deionized water surplus.This molybdate is one or more in Sodium orthomolybdate or the potassium molybdate; This organophosphate is one or more of PBTCA or HEDP; This multipolymer is one or more of PAA or PAAS.Whole prescription is made of multiple corrosion inhibitor ingredient, and these components not only will have good inhibition separately, and can produce good synergy in compound use, and the water conditioning function that performance is maximum is to reach the purpose of protection pipeline and equipment.
Design philosophy of the present invention is:
1) molybdate all has good corrosion mitigating effect under aerobic and oxygen-free environment, is fit to very much closed system;
2) molybdate and nitrite, phosphoric acid salt are different, are not the nutrition of bacterium;
3) molybdate and multiple inhibiter, Scale inhibitors have excellent compatibility, exist to reduce consumption, reduce the possibility of expense;
4) molybdate low toxicity, no environmental protection public hazards;
Specific embodiments of the invention are:
Embodiment one:
Molybdate, organophosphate and multipolymer be composite to form, and its weight percent is formed and to be, molybdate selects for use Sodium orthomolybdate to account for 2%, and organophosphate selects for use PBTCA to account for 1%, and multipolymer selects for use PAA to account for 30%, the deionized water surplus.
Embodiment two:
Molybdate, organophosphate and multipolymer be composite to form, and its weight percent is formed and to be, molybdate selects for use potassium molybdate to account for 5%, and organophosphate selects for use HEDP to account for 5%, and multipolymer selects for use PAA to account for 30%, the deionized water surplus.
Embodiment three:
Molybdate, organophosphate and multipolymer be composite to form, and its weight percent is formed and to be, molybdate selects for use potassium molybdate to account for 40%, and organophosphate selects for use HEDP to account for 30%, and multipolymer selects for use PAAS to account for 30%.
Embodiment four:
Molybdate, organophosphate and multipolymer be composite to form, and its weight percent is formed and to be, molybdate selects for use Sodium orthomolybdate to account for 30%, and organophosphate selects for use HEDP to account for 30%, and multipolymer selects for use PAA to account for 1%, the deionized water surplus.
Embodiment five:
Molybdate, organophosphate and multipolymer be composite to form, and its weight percent is formed and to be, molybdate selects for use potassium molybdate to account for 30%, and organophosphate selects for use PBTCA to account for 30%, and multipolymer selects for use PAAS to account for 30%, the deionized water surplus.
Embodiment six:
Molybdate, organophosphate and multipolymer be composite to form, and its weight percent is formed and to be, molybdate selects for use potassium molybdate to account for 5%, and organophosphate selects for use HEDP to account for 5%, and multipolymer selects for use PAA to account for 1%, the deionized water surplus.
Embodiment seven:
Molybdate, organophosphate and multipolymer be composite to form, and its weight percent is formed and to be, molybdate selects for use Sodium orthomolybdate to account for 2%, and organophosphate selects for use PBTCA to account for 1%, and multipolymer selects for use PAA to account for 1%, the deionized water surplus.
Embodiment eight:
Molybdate, organophosphate and multipolymer be composite to form, and its weight percent is formed and to be, molybdate selects for use Sodium orthomolybdate and potassium molybdate respectively to account for 2%, and organophosphate selects for use PBTCA to account for 1%, and multipolymer selects for use PAA to account for 30%, the deionized water surplus.
Embodiment nine:
Molybdate, organophosphate and multipolymer be composite to form, and its weight percent is formed and to be, molybdate select for use Sodium orthomolybdate account for 12% and potassium molybdate account for 28%, organophosphate select for use PBTCA account for 15% and HEDP account for 15%, multipolymer selects for use PAA to account for 30%.
Embodiment ten:
Molybdate, organophosphate and multipolymer be composite to form, its weight percent is formed, molybdate select for use Sodium orthomolybdate account for 12% and potassium molybdate account for 28%, organophosphate select for use PBTCA account for 15% and HEDP account for 15%, multipolymer select for use PAA account for 10% and PAAS account for 20%.
By following Analysis on action mechanism and every test result of use of the present invention is described:
(1) hydrochlorate inhibition mechanism:
The mechanism of action of molybdate is: generate the solvay-type passive film of iron-ferric oxide-molybdenum oxide on iron anode, just can finish under the situation that this passivation requires to have dissolved oxygen to exist, be shown below:
(2) the molybdate compound prescription is to the corrosion test (table 1) of iron
| Hydroxyl phosphoric acid+multipolymer/mg/L | Na 2MoO 4/mg/L | Erosion rate/mg/ (dm 2·d) |
| 6 | 80 | 1.13 |
| 6 | 60 | 4.62 |
| 6 | 40 | 8.31 |
This test is a carbon steel with material, and test conditions is: 50 ℃ of temperature; Test water: local tap water.
(3) service water rotary hanging plate experiment:
A) test apparatus: RCC-I type rotary hanging plate corrosion experiment instrument
B) test conditions: 60 ℃ of test temperatures
Test period 72 hours
Cycles of concentration 2.5
Test water: steelworks 1# continuous casting circulation in plum mountain is cooled off soft water wherein:
PH value: 7.0-8.0; SS:＜20mg/L; Specific conductivity:＜650us/cm
M-basicity:＞50mg/L; Total hardness:＜30mg/L; Cl ion:＜1000mg/L
Fe ion:＜0.8mg/L
Rotary hanging plate test-results (table 2)
| Sequence number | Dosing ppm | Corrosion speed mm/a | Remarks | |
| 1 | Blank | 1.171 | The surface uniform corrosion | |
| 2 | 1# | 200 | 0.438 | Seriously corroded has spot corrosion |
| 3 | 400 | 0.514 | Seriously corroded has spot corrosion | |
| 4 | 600 | 0.464 | Seriously corroded has spot corrosion | |
| 5 | 2# | 200 | 0.126 | Rust staining is arranged |
| 6 | 400 | 0.117 | Rust staining is arranged | |
| 7 | 600 | 0.105 | Rust staining is arranged | |
| 8 | 3# | 200 | 0.052 | The no spot corrosion of light |
| 9 | 400 | 0.040 | The no spot corrosion of light | |
| 10 | 600 | 0.015 | The no spot corrosion of light | |
From table 2 test-results as can be seen, the corrosion rate of 3# product of the present invention is that the corrosion of Carbon Steel rate is less than 0.125mm/a well below the design specifications of national regulation, and therefore, the prescription of 3# medicament can be tentatively definite.
(4) plum mountain steelworks 2# continuous casting soft water cycle cooling water system field experiment
Quantity of circulating water: 516m
3/ h
Ductwork pressure: 1.0Mpa
System keeps the water yield: 350m
3
Rate of water make-up: 5m
3/ h
Supply water temperature＜40 ℃, return water temperature＜51 ℃.
Drug concentration: 200ppm
Test period: 90 days
The water quality of this system is seen: the water quality in the test of (3) service water rotary hanging plate.
The main users of this system is: the crystallizer water coolant. level detection meter water coolant. and cutting machine water coolant etc.
The present invention is in continuous casting soft water circulation system effect field monitoring data (table 3)
| The pipe number | The test tube numbering | Heavy g before the pickling | Heavy g after the pickling | Adhesion amount mg | Adhere to speed MCM | Mean value MCM |
| 1# | 1-1 | 150.7523 | 150.6036 | 148.7 | 2.49 | 2.955 |
| 1-2 | 151.4204 | 151.2607 | 159.7 | 2.68 | ||
| 1-3 | 145.8739 | 145.6740 | 199.9 | 3.35 | ||
| 1-4 | 150.2373 | 150.0402 | 197.1 | 3.30 | ||
| 2# | 2-1 | 150.7206 | 150.5329 | 187.1 | 3.15 | 3.200 |
| 2-2 | 150.4826 | 150.2945 | 188.1 | 3.15 | ||
| 2-3 | 151.6355 | 151.4373 | 198.2 | 3.33 | ||
| 2-4 | 152.8272 | 152.6387 | 188.5 | 3.17 |
The present invention is in continuous casting soft water circulation system effect field monitoring data (table 4)
| The lacing film position | The lacing film numbering | Heavy g before the test | The heavy g in test back | Corrosion speed mm/a | Mean value mm/a |
| Inlet | 1074 | 20.3734 | 20.3702 | 0.0028 | 0.0031 |
| 1075 | 20.7189 | 20.7152 | 0.0033 | ||
| 1071 | 20.7063 | 20.7025 | 0.0033 | ||
| Outlet | 1050 | 18.3708 | 18.3303 | 0.0354 | 0.0261 |
| 1041 | 18.0204 | 18.0045 | 0.0139 | ||
| 1076 | 20.4877 | 20.4544 | 0.0291 |
Plum mountain steelworks make up water is a Yangtze River Water, have low basicity, soft, etc. characteristics, be to belong to corrosion type water quality.By table 3, table 4 as seen, under low ion concns, low ph condition, the present invention has good corrosion inhibition and scale-inhibiting properties.
Three, conclusion
1), can be applied to circulating water system under low ion concns, low ph condition with the inhibiter of molybdate, organic acid of seeing, water solubility copolymer and the compound preparation of water.
2), product of the present invention is at closed circuit softening water recycle system dosage 200～400ppm, average inhibition speed is 0.0261mm/a, well below " Code for design of industrial recirculating cooling water treatment " (GB50050-95) regulation corrosion of Carbon Steel rate be less than 0.125mm/a, requirement.
Claims (3)
1, a kind of continuous casting soft water, steel-making soft water system corrosion inhibiting and descaling agent is characterized in that: form by molybdate, organophosphate and multipolymer are composite, its weight percent composition is, molybdate 2-40%, organophosphate 1-30%, copolymer 1-30%, deionized water surplus.
2, continuous casting soft water according to claim 1, steel-making soft water system corrosion inhibiting and descaling agent, it is characterized in that: this molybdate is one or more in Sodium orthomolybdate or the potassium molybdate; This organophosphate is one or more of PBTCA or HEDP; This multipolymer is one or more of PAA or PAAS.
3, continuous casting soft water according to claim 2, steel-making soft water system corrosion inhibiting and descaling agent, it is characterized in that: its weight percent composition is molybdate 5-30%, organophosphate 5-30%, copolymer 1-30%, deionized water surplus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410025022 CN1706759A (en) | 2004-06-09 | 2004-06-09 | Scale and corrosion inhibitor for continuous casting soft water and steel making soft water system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410025022 CN1706759A (en) | 2004-06-09 | 2004-06-09 | Scale and corrosion inhibitor for continuous casting soft water and steel making soft water system |
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| Publication Number | Publication Date |
|---|---|
| CN1706759A true CN1706759A (en) | 2005-12-14 |
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ID=35580899
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| CN 200410025022 Pending CN1706759A (en) | 2004-06-09 | 2004-06-09 | Scale and corrosion inhibitor for continuous casting soft water and steel making soft water system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460566C (en) * | 2005-12-27 | 2009-02-11 | 中国石油化工股份有限公司 | Molybdenum phosphine system composite anti-erosion anti-sludging agent and preparation method thereof |
| CN102451598A (en) * | 2010-10-27 | 2012-05-16 | 中国石油化工股份有限公司 | Composite corrosion inhibitor for carbon dioxide removing system and application thereof |
| CN102863090A (en) * | 2011-07-08 | 2013-01-09 | 爱环吴世(苏州)环保有限公司 | Corrosion and scale inhibitor for low-hardness water and preparation method thereof |
| CN105906076A (en) * | 2016-06-14 | 2016-08-31 | 沧州泓海化工有限公司 | Molybdate corrosion inhibitor and using method thereof |
| CN111455393A (en) * | 2020-05-15 | 2020-07-28 | 武汉金鼎新环保科技有限公司 | Compound type soft water special corrosion inhibitor and preparation method thereof |
| CN112939282A (en) * | 2021-02-22 | 2021-06-11 | 山西太钢不锈钢股份有限公司 | Method for adjusting water supply conductivity |
-
2004
- 2004-06-09 CN CN 200410025022 patent/CN1706759A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460566C (en) * | 2005-12-27 | 2009-02-11 | 中国石油化工股份有限公司 | Molybdenum phosphine system composite anti-erosion anti-sludging agent and preparation method thereof |
| CN102451598A (en) * | 2010-10-27 | 2012-05-16 | 中国石油化工股份有限公司 | Composite corrosion inhibitor for carbon dioxide removing system and application thereof |
| CN102451598B (en) * | 2010-10-27 | 2015-01-14 | 中国石油化工股份有限公司 | Composite corrosion inhibitor for carbon dioxide removing system and application thereof |
| CN102863090A (en) * | 2011-07-08 | 2013-01-09 | 爱环吴世(苏州)环保有限公司 | Corrosion and scale inhibitor for low-hardness water and preparation method thereof |
| CN105906076A (en) * | 2016-06-14 | 2016-08-31 | 沧州泓海化工有限公司 | Molybdate corrosion inhibitor and using method thereof |
| CN111455393A (en) * | 2020-05-15 | 2020-07-28 | 武汉金鼎新环保科技有限公司 | Compound type soft water special corrosion inhibitor and preparation method thereof |
| CN112939282A (en) * | 2021-02-22 | 2021-06-11 | 山西太钢不锈钢股份有限公司 | Method for adjusting water supply conductivity |
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