CN102345130A - Corrosion inhibitor - Google Patents
Corrosion inhibitor Download PDFInfo
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- CN102345130A CN102345130A CN2011102525458A CN201110252545A CN102345130A CN 102345130 A CN102345130 A CN 102345130A CN 2011102525458 A CN2011102525458 A CN 2011102525458A CN 201110252545 A CN201110252545 A CN 201110252545A CN 102345130 A CN102345130 A CN 102345130A
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- corrosion
- inhibiter
- corrosion inhibitor
- molybdate
- aluminium alloy
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Abstract
The invention belongs to the technical field of corrosion prevention of aluminum alloys. A corrosion inhibitor is characterized by comprising 0.05-0.10 mu g/g of molybdate, 1.0-4.0mu g/g of calcium gluconate, 0.05-0.2 mu g/g of hydrosulfuryl benzothiazole, 0.05-0.2mu g/g of borate, and 0.05-0.10mu g/g of phosphomocarboxylic acid. The prepared aluminum alloy corrosion inhibitor is a salt solution medium aluminum alloy corrosion inhibitor with the advantages of low cost, effectiveness, low toxicity, strong practicability, no damage to the original process, and no addition of auxiliary equipment.
Description
Technical field: the aseptic technic field that the invention belongs to aluminium alloy.
Background technology:
Aluminium alloy has advantages such as light weight, anti-corrosion, easy processing and the strong height of machinery, makes its Application Areas expand gradually.For example: along with the exploitation of the mankind to the ocean, a large amount of aluminium alloy equipment are used for ocean operation; In addition, along with the widespread use of aluminium alloy at aspects such as heat exchanger, water tank, pipeline, water pump, containers.Seawater exists corrosion to need to adopt corrosion inhibitor of sea water to hardware.In addition, in various refrigerants, industrial calcium chloride, sodium chloride aqueous solution are widely used in all kinds of refrigerators with advantages such as its freezing point are low, cheap and need to reduce the equipment and the occasion of freezing point at present.Because industrial calcium chloride, sodium chloride aqueous solution have certain corrodibility, during therefore as antifreezing agent, considered protection against corrosion problem is to guarantee the work-ing life of equipment.Therefore, topic causes that more and more inhibiter has very large development prospect in extensive concern, the especially brine media between the corrosion of aluminium and aluminium alloy.
Because the character of aluminum self, the corrosion characteristics of aluminum alloy materials in brine media is different from acid, alkaline solution and neutral aqueous solution.Aluminium is active amphoteric metal, in acid, alkaline solution, forms uniform corrosion.In neutral aqueous solution, because the passive state character of aluminum alloy surface, its corrosion is the local corrosion characteristic, and pitting is its typical local corrosion form.Aluminium alloy crevice corrosion in brine media seems particularly evident, and crevice corrosion is the inner local corrosion of aluminium alloy, and its extent of corrosion is serious than pitting attack and uniform corrosion, and therefore, the exploitation of brine media inhibiter comes into one's own day by day.
Adopt the inhibiter aseptic technic to compare with other inhibition anti-corrosion methods, it is more economical, flexible, convenient.Existing inhibiter has type oxide film, deposition membranous type and absorption membranous type inhibiter etc.Chromic salt, nitrite, molybdate, tungstate, vanadate, orthophosphoric acid salt, borate etc. all are counted as the type oxide film inhibiter.Mostly they are anodic corrosion inhibitor or dangerous type inhibiter; In case because their underdosages (during inhibition, handle 1L water separately, required dosage often up to hundreds of in addition cross thousand milligrams) will cause spot corrosion; Make original not too serious etching problem, it is more serious to become on the contrary.And chlorion, high temperature and high water flow velocity all can disruptive oxidation films.The carbonate of zinc, phosphoric acid salt and oxyhydroxide, the carbonate of calcium and phosphoric acid salt are modal deposition membranous type inhibiter.Because the sedimentation type corrosion inhibiting film does not have and the metallic surface directly combines, and is porous, often appear at the metallic surface and adhere to bad phenomenon, corrosion mitigating effect is not as the oxidized form film.Mostly absorption membranous type inhibiter is organic inhibitor, and when the metallic surface was cleaning or active condition, this type of inhibiter can form the gratifying adsorption film of corrosion mitigating effect.If but there is corrosion product the metallic surface or has under the situation of dirt deposition, the respond well corrosion inhibiting film of just very difficult formation.
To present stage the brine media inhibiter exist that corrosion inhibition rate is on the low side, dosage is big, the problems such as toxic, price height that have; The present invention developed first a kind of economy, effectively, low toxicity and suitability be strong; And protect original technical process not to be destroyed; The aluminium alloy inhibiter that needs the brine media of optional equipment hardly can be widely used in each production department of national economy.
Summary of the invention:
The objective of the invention is to design a kind of economy, effectively, low toxicity and suitability be strong, and protects original technical process not to be destroyed, and needs the brine media aluminium alloy inhibiter of optional equipment hardly.
Inhibiter, it is characterized in that its by molybdate 0. 05～0. 10ug/g, calglucon 1.0～4. 0 ug/g, coloured glaze base benzothiazole 0.05～0. 2ug/g, borate 0.05～0. 2ug/g, phosphine carboxylic acid 0. 05～0. 10ug/g form.
The slow rotten agent principle of brine media aluminium alloy of the present invention is the principle that this prescription has adopted absorption membranous type inhibiter; On the metallic surface, form the close and real film of one deck rapidly; On this basis, interpolation has synergistic additive, thereby plays the effect of the stability that has improved adsorption layer.
Coloured glaze base benzothiazole has nitrogenous polarity gene, can be formed one deck unimolecular film at whole anode and cathode zone by metallic surface electric charge absorption, thus prevention or slow down corresponding electrochemical reaction.Because the inhibition mechanism of inhibiter is film forming, so be the key that obtains the inhibition success.For rapidly, the concentration of inhibiter should be enough high in the water, but the solubleness of coloured glaze base benzothiazole in water is extremely low.Thereby, need interpolation to have synergistic additive.Molybdate is a kind of tensio-active agent, and two kinds of incompatible groups are arranged in its molecule; Hydrophilic group and oleophilic group.The molecule of this compound is adsorbed on the metallic surface with hydrophilic group, forms the fine and close hydrophobic film of one deck, and the protective money metal surface is not subjected to aqueous corrosion, can effectively help coloured glaze base benzothiazole film forming.Calglucon can play effective inhibiting inhibiter to aluminium corrosion in the salt solution.Simultaneously, when gluconate is made inhibiter and many inhibiter cooperate and to present synergistic effect, and have excellent complex performance and good scale inhibition effect.Therefore, the slow rotten agent of brine media aluminium alloy of the present invention is main salt with molybdate, calglucon and coloured glaze base benzothiazole.
Beneficial effect
Corrosion inhibitor formula of the present invention have economy, effectively, low toxicity and suitability be strong, and protects original technical process not to be destroyed, and needs the characteristics of optional equipment hardly.In water dissolution, molybdate, calglucon and coloured glaze base benzothiazole have the characteristics of the lower and stable in properties of toxicity.Act synergistically between molybdate, calglucon and the coloured glaze base benzothiazole; They are different as the mechanism of action of inhibiter; Action site is different; Therefore chemical action takes place in the metallic surface form the polar molecule difference of having an effect in the macromolecular compound adsorption layer; Improve surface coverage or form the interaction of multilayer adsorption thing, improved the stability of adsorption layer, reduced the working concentration of inhibiter; Reduce toxicity, enlarged the scope of application.The experimental result surface, the corrosion inhibition rate of corrosion inhibitor formula of the present invention all reaches more than 95%.
Embodiment
Embodiment 1
A kind of inhibiter is characterized in that it and is made up of molybdate 0. 05ug/g, calglucon 1.0ug/g, coloured glaze base benzothiazole 0.05ug/g, borate 0.05ug/g, phosphine carboxylic acid 0. 05ug/g.
Embodiment 2
A kind of inhibiter is characterized in that it and is made up of molybdate 0. 10ug/g, calglucon 4. 0 ug/g, coloured glaze base benzothiazole 0. 2ug/g, borate 0. 2ug/g, phosphine carboxylic acid 0. 10ug/g.
Embodiment 3
A kind of inhibiter is characterized in that it and is made up of molybdate 0. 07ug/g, calglucon 3. 0 ug/g, coloured glaze base benzothiazole 0.15/g, borate 0.15ug/g, phosphine carboxylic acid 0. 06ug/g.
Embodiment 4
Prescription and the test-results of representing inhibiter of the present invention below with form.
The prescription of table 1 inhibiter of the present invention and test-results
| Instance | Corrosion inhibition rate (%) | The test piece outward appearance |
| _ | ? | Be covered with rust deposite |
| Embodiment 1 | 96．32 | Surface-brightening, no spot corrosion |
| Embodiment 2 | 95.09 | Surface-brightening, no spot corrosion |
| Embodiment 3 | 97.87 | Surface-brightening, no spot corrosion |
Claims (1)
1. inhibiter, it is characterized in that its by molybdate 0. 05～0. 10ug/g, calglucon 1.0～4. 0 ug/g, coloured glaze base benzothiazole 0.05～0. 2ug/g, borate 0.05～0. 2ug/g, phosphine carboxylic acid 0. 05～0. 10ug/g form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102525458A CN102345130A (en) | 2011-08-30 | 2011-08-30 | Corrosion inhibitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102525458A CN102345130A (en) | 2011-08-30 | 2011-08-30 | Corrosion inhibitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102345130A true CN102345130A (en) | 2012-02-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102525458A Pending CN102345130A (en) | 2011-08-30 | 2011-08-30 | Corrosion inhibitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109486360A (en) * | 2018-12-13 | 2019-03-19 | 广州集泰化工股份有限公司 | A kind of aqueous one-component organic zinc-rich paint and its preparation method and application |
| WO2021025888A1 (en) * | 2019-08-07 | 2021-02-11 | Ecolab Usa Inc. | Corrosion inhibitor for systems with mixed metallurgy |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1718863A (en) * | 2005-04-26 | 2006-01-11 | 中国海洋大学 | Film green corrosion inhibitor for inhibiting corrosion of carbon steel in sea water |
| CN1919752A (en) * | 2006-09-11 | 2007-02-28 | 北京瀚博英电力科技有限公司 | Environment-friendly type composite corrosion and scale inhibitor |
| CN101066811A (en) * | 2007-06-15 | 2007-11-07 | 武汉金坡化工科技有限公司 | No-phosphate corrosion and scale inhibitor and its application |
| CN101781028A (en) * | 2010-02-09 | 2010-07-21 | 南京工大开元化学有限公司 | High-efficiency low-phosphorous corrosion and scale inhibition dispersant as well as preparation method and application thereof |
-
2011
- 2011-08-30 CN CN2011102525458A patent/CN102345130A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1718863A (en) * | 2005-04-26 | 2006-01-11 | 中国海洋大学 | Film green corrosion inhibitor for inhibiting corrosion of carbon steel in sea water |
| CN1919752A (en) * | 2006-09-11 | 2007-02-28 | 北京瀚博英电力科技有限公司 | Environment-friendly type composite corrosion and scale inhibitor |
| CN101066811A (en) * | 2007-06-15 | 2007-11-07 | 武汉金坡化工科技有限公司 | No-phosphate corrosion and scale inhibitor and its application |
| CN101781028A (en) * | 2010-02-09 | 2010-07-21 | 南京工大开元化学有限公司 | High-efficiency low-phosphorous corrosion and scale inhibition dispersant as well as preparation method and application thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109486360A (en) * | 2018-12-13 | 2019-03-19 | 广州集泰化工股份有限公司 | A kind of aqueous one-component organic zinc-rich paint and its preparation method and application |
| WO2021025888A1 (en) * | 2019-08-07 | 2021-02-11 | Ecolab Usa Inc. | Corrosion inhibitor for systems with mixed metallurgy |
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Application publication date: 20120208 |