CN1015647B - Composite molybdate as high-efficiency inhibitor of corrosion and dirty - Google Patents
Composite molybdate as high-efficiency inhibitor of corrosion and dirtyInfo
- Publication number
- CN1015647B CN1015647B CN 88105280 CN88105280A CN1015647B CN 1015647 B CN1015647 B CN 1015647B CN 88105280 CN88105280 CN 88105280 CN 88105280 A CN88105280 A CN 88105280A CN 1015647 B CN1015647 B CN 1015647B
- Authority
- CN
- China
- Prior art keywords
- corrosion
- sodium
- molybdate
- salt
- dirty
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The present invention relates to a high-efficiency composite molybdate corrosion and dirty inhibitor for neutral water systems, which is composed of six salts: molybdate, zinc salts, gluconate, inorganic phosphate, organic phosphate and succinate. The present invention has the advantages of little medicine dosage, low cost, high corrosion inhibition rate, favorable dirty inhibition effect, low toxicity and no public nuisance and also has the characteristic of high salt and high chlorine corrosion resistance performance. The present invention can be used for seawater.
Description
The invention belongs to corrosion inhibiting and descaling agent, belong to the surperficial corrosion mitigation and antiscaling technology that has corrosion dangerous in the neutral water in more detail.
Molybdate (sodium salt, ammonium salt) is generally acknowledged as be corroded the researchist of subject of carbon steel material effective corrosion inhibitors in the neutral water system.People from Italy such as K.S.Rajagopalan achievement in research shows, molybdate can be used as effective inhibiter (4th Eur.Symp.Corros.Inhibitors, Ferrara, Italy, 60(1975)) that carbon steel and stainless steel prevent spot corrosion.The J.P.G.Farr of Britain and the people such as E.A.Lizlovs of the U.S. think that also molybdate has good deactivation function and ideal corrosion mitigating effect for carbon steel in the neutral water system, (Surface technology is promoted the use of in suggestion in factory, No.17,19(1982); No.19,137(1983); Corrosion, Vol.32, NO.7(1976)).In No. 57174472 patents of Jp, also narrated a kind of inhibiter that comprises molybdate.
Investigators notice between some salts with corrosion inhibition and show synergistic effect.For example molybdate just forms hybrid corrosion inhibitor with share as the zinc salt of cathodic corrosion inhibitor, and gluconate and zinc salt coexistence also have obvious synergistic effect (C.Wrubl etc., 6th Eurp.Symp.on Corros.Inhibitors, Ferrara, Italy, Vol.1, p551, Sept.16-20(1985)) people (Internationalcongress on metallic Corrosion such as .S.M.Abd El Haleem, Toronto, Canada, Vol.4 p362, June3-7(1984)) point out that the existence of succinate can make carbon steel and stainless passive film break up current potential and obviously shuffle.Document is arranged in addition, and (Paper on U.K.Corrosion 86 Birmingham U.K.17-19(Nov.) point out also to show between phosphoric acid salt, molybdate and the zinc salt synergistic effect.
Though above-mentioned prior art can protection against corrosion, when having only in the neutral water molybdate dense (more than the 100ppm), its corrosion inhibition rate just can reach more than 95%.Like this,, cause the inhibiter cost too high, be difficult to large-scale popularization use in factory because molybdate costs an arm and a leg.In addition, molybdenum is that composite corrosion inhibitor seldom is used in and contains a large amount of cl
-Recirculated water and seawer system in.
Purpose of the present invention is exactly the efficient composite corrosion inhibitor that a kind of cheapness will be provided, and can make carbon steel and stainless steel (comprise and contain a large amount of cl at the neutral water medium
-And seawater) inhibition and scale inhibition in.
Six kinds of salt of molybdate compound corrosion inhibitor of the present invention, i.e. molybdate, zinc salt, gluconate, inorganic phosphate, organic phosphonate and succinate.When being used for the cities and towns tap water, the concentration of Sodium orthomolybdate is 6-12ppm, Sunmorl N 60S 6-10ppm, sodium phosphate 5-8ppm, ethylene diamine tetra methylene phosphonic acid 4-6ppm, zinc nitrate 6-12ppm, sodium succinate 15-25ppm.When being used for the high water of seawater or chloride ion content, Sodium orthomolybdate 25-40ppm, Sunmorl N 60S 30-45ppm, sodium phosphate 15-30ppm, ethylene diamine tetra methylene phosphonic acid 12-18ppm, zinc nitrate 35-60ppm, sodium succinate 100-130ppm.Wherein add an amount of inorganic phosphate, purpose is to make it to form composite salt with molybdate, to improve the function of hybrid corrosion inhibitor.Introduce an amount of succinate with the collaborative ability that improves the resisting chloride ion penetration spot corrosion.Introduce a spot of organic phosphonate, have scale effect.Pei Zhi result can further bring into play the synergistic effect (having confirmed the existence of this kind synergistic effect in direct current polarization and weightless test significantly) of molybdenum-phosphorus-zinc hybrid corrosion inhibitor and succinate and grape hydrochlorate like this.
Molybdate series composite slow-corrosion scale resistor of the present invention, its PH scope that is suitable for is 5-10, temperature range is 0-80 ℃, can be used for the corrosion protection and the scale inhibition of equipment pipe of recirculated water, the water coolant heat-exchange system of departments such as chemical industry, chemical fertilizer, pharmacy, agricultural chemicals, electric power, heat supply.
The experiment of embodiment 1 static corrosion.Get A
3No. 260, No. 400 sand paperings are successively used in 10 of steel test pieces respectively, clean with dehydrated alcohol, use distilled water flushing, dry up with blower then, weigh.Get 10 200ml beakers, add earlier Sodium orthomolybdate, Sunmorl N 60S, sodium phosphate and ethylene diamine tetra methylene phosphonic acid hybrid working mother liquor 2ml respectively, add zinc nitrate and sodium succinate hybrid working mother liquor 2ml more respectively, be diluted to 200ml with cities and towns, Qingdao tap water respectively then, make each component concentration be: Sodium orthomolybdate 8ppm; Sunmorl N 60S 8ppm; Sodium phosphate 6ppm; Ethylene diamine tetra methylene phosphonic acid 5ppm; Zinc nitrate 6ppm; Sodium succinate 17ppm.The test piece of getting ready is hung in the beaker 30 days (in beaker, adding a small amount of tap water every five days between soak period) of immersion corrosion to keep liquid level with nylon wire.Take out test piece, corrosion product is removed in pickling, dries up, and weighs, and calculates corrosion rate and corrosion inhibition rate respectively, averages then.This experiment gained result: average corrosion rate is 0.63mpy; Average corrosion inhibition rate is 96%.
Embodiment 2 rotation test piece corrosion experiments, the test piece processing is identical with embodiment 1 with the solution process for preparation.Experimental water is the Qingdao coastal seawater, and each components contents of composite slow-corrosion scale resistor is: Sodium orthomolybdate 30ppm, Sunmorl N 60S 40ppm, sodium phosphate 25ppm, ethylenediamine tetraacetic methene acid 15ppm, zinc nitrate 36ppm, sodium succinate 120ppm.Get 5 test pieces of handling well, be fixed on the synthetic glass rotating disk with the synthetic glass screw respectively.Experiment condition: temperature is a room temperature, and rotating speed is 40 rev/mins, linear velocity 0.4 meter per second, and ventilation was rotated 120 hours continuously continuously.Take out test piece then, corrosion product is removed in pickling, dries up, and weighs.By above-mentioned experimental procedure repeated experiments once, carry out data processing then, obtain a result: average corrosion rate 0.71mpy; Average corrosion inhibition rate 95%.
Advantage drug dosage of the present invention is few, and cost is low, the corrosion inhibition rate height, and scale inhibition effect is good, and low toxicity is nuisanceless etc., and has the characteristic of high salt tolerance, high chlorine corrosion, can keep higher corrosion inhibition rate and scale inhibition performance in the recirculated water (comprising seawater) of high salt. Total consumption of medicine is 50-75ppm in running water; Be 260-300ppm in seawater, wherein the content of molybdate is no more than 30ppm, and its corrosion inhibition rate all can reach more than 95%.
Claims (3)
1, a kind of corrosion inhibiting and descaling agent for the carbon steel metal material of pH scope in the aqueous systems of 5-10 is characterized in that it is by six kinds of salt, and promptly Sodium orthomolybdate, zinc nitrate, Sunmorl N 60S, inorganic phosphate sodium, ethylene diamine tetra methylene phosphonic acid and sodium succinate are formed.
2, as the said corrosion inhibiting and descaling agent of claim 1, when it is characterized in that being used for the cities and towns tap water, the concentration range that said six kinds of salt are suitable for is as follows: Sodium orthomolybdate 6～12ppm, Sunmorl N 60S 6～10ppm, sodium phosphate 5～8ppm, ethylene diamine tetra methylene phosphonic acid 4～6ppm, zinc nitrate 6～12ppm, sodium succinate 15～25ppm.
3, as the said corrosion inhibiting and descaling agent of claim 1, it is characterized in that being used for seawater or the high water of chloride ion content, the concentration range that said six kinds of salt are suitable for is as follows:
Sodium orthomolybdate 25～40ppm, Sunmorl N 60S 30～45ppm, sodium phosphate 15～30ppm, ethylene diamine tetra methylene phosphonic acid 12～18ppm, zinc nitrate 35～60ppm, sodium succinate 100～130ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105280 CN1015647B (en) | 1988-06-03 | 1988-06-03 | Composite molybdate as high-efficiency inhibitor of corrosion and dirty |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105280 CN1015647B (en) | 1988-06-03 | 1988-06-03 | Composite molybdate as high-efficiency inhibitor of corrosion and dirty |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1038312A CN1038312A (en) | 1989-12-27 |
| CN1015647B true CN1015647B (en) | 1992-02-26 |
Family
ID=4833490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88105280 Expired CN1015647B (en) | 1988-06-03 | 1988-06-03 | Composite molybdate as high-efficiency inhibitor of corrosion and dirty |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015647B (en) |
Families Citing this family (5)
| 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 |
| CN100509652C (en) * | 2007-06-15 | 2009-07-08 | 武汉金坡化工科技有限公司 | No-phosphate corrosion and scale inhibitor and application thereof |
| CN101748399B (en) * | 2008-12-04 | 2011-11-09 | 攀钢集团钢铁钒钛股份有限公司 | Coating composition, preparation method and zinc plating passivating material thereof |
| CN103663744A (en) * | 2013-12-09 | 2014-03-26 | 山东华亚环保科技有限公司 | Composite corrosion and scale inhibitor for circulating cooling water |
| CN106245038A (en) * | 2016-08-13 | 2016-12-21 | 威海翔宇环保科技股份有限公司 | A kind of recirculated water Low-temperature corrosion inhibitor |
-
1988
- 1988-06-03 CN CN 88105280 patent/CN1015647B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1038312A (en) | 1989-12-27 |
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| CF01 | Termination of patent right due to non-payment of annual fee |