CN102304717A - Aluminum alloy corrosion inhibitor for neutral medium - Google Patents
Aluminum alloy corrosion inhibitor for neutral medium Download PDFInfo
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- CN102304717A CN102304717A CN201110272091A CN201110272091A CN102304717A CN 102304717 A CN102304717 A CN 102304717A CN 201110272091 A CN201110272091 A CN 201110272091A CN 201110272091 A CN201110272091 A CN 201110272091A CN 102304717 A CN102304717 A CN 102304717A
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- aluminum alloy
- corrosion inhibitor
- neutral medium
- zinc sulfate
- alloy corrosion
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Abstract
The invention belongs to the technical field of corrosion protection for aluminum alloy. The invention relates to an aluminum alloy corrosion inhibitor for a neutral medium. The aluminum alloy corrosion inhibitor for the neutral medium is characterized in that: 1 g of the aluminum alloy corrosion inhibitor comprises 0.1-0.2 mg of zinc sulfate, 0.1-0.2 mg of sodium oleate, 0.1-0.2 mg of sodium orthophosphate and 0.1-0.2 mg of tallow amine. According to the present invention, the corrosion inhibition effect is provided for the aluminum alloy through the synergistic reaction of the zinc sulfate and the sodium oleate; the aluminum alloy corrosion inhibitor formed according to the ratio of the zinc sulfate to the sodium oleate is the aluminum alloy corrosion inhibitor for the neutral medium, wherein the aluminum alloy corrosion inhibitor for the neutral medium is low-toxic, high-efficient and economic, and does not affect the existing technological process.
Description
Technical field: the aseptic technic field that the invention belongs to aluminium alloy.
Background technology:
On earth, aluminium is the element of standing stock ranking the 3rd, has obtained using extremely widely in each department of national economy.Aluminium surface energy under field conditions (factors) forms layer oxide film, but this tunic is extremely thin, cracky, thereby its resistance to corrosion is very poor, it is very surprising causing the annual corrosion loss that causes because of various environment.In order to improve the corrosion resistance nature of aluminum alloy materials; Make the aluminum alloy materials can be better; More effectively be applied in the industry-by-industry, the researchist has used the whole bag of tricks that it is carried out effective inhibition processing both at home and abroad, and the inhibiter technology has obtained increasing attention in the protection of aluminium alloy.
Existing aluminium alloy inhibiter; The influence to the electrochemical metal corrosion process in medium is divided into anode type, cathode type and hybrid corrosion inhibitor according to inhibiter, as: chromic salt, nitrate, nitrite, phosphite, silicate, benzoate, poly-phosphate, arsonium ion, antimony ion etc.In neutral medium, generally select for use inorganics to make inhibiter, like chromic salt and nitrite but this type inhibiter toxicity is big, contaminate environment, soon with disabled.Organic inhibitor is one type of important organic inhibitor, and organic inhibitor has improved the anti-pitting attack ability of aluminium alloy in the solution of lower concentration, but its working concentration is restricted, and promptly when its concentration is higher, can cause the caustic corrosion of aluminium alloy.
Present stage has many materials can both prevent or slow down the corrosion of metal in medium to some extent, but real with practical value having only those add-ons are few, low price and can reduce the material of rate of metal corrosion greatly.At present, the aluminium alloy inhibiter of neutral medium also must have the characteristics of low toxicity, can not impact environment, and such material is less.Thereby, a kind of low toxicity, efficient, economy, the neutral medium aluminium alloy inhibiter that does not influence original technical process is suddenly waited to develop.
Summary of the invention:
The objective of the invention is to design a kind of low toxicity, efficient, economy does not influence the neutral medium aluminium alloy inhibiter of original technical process.
A kind of aluminium alloy inhibiter of neutral medium is characterized in that zinc sulfate 0. 1～0. 2mg/g, sodium oleate 0. 1～0. 2mg/g, sodium orthophosphate 0. 1～0. 2mg/g, tallow amine 0. 1～0. 2mg/g.
The slow rotten agent principle of aluminium alloy of the present invention is material that is added and the Al that dissolves
3+Form stable and insoluble chelate.So this material can be used as inhibiter aluminium alloy is played the effect of protection, adds the generation that this layer conversion film that material forms in aluminum alloy surface suppressed the aluminium alloy spot corrosion.
The corrosion process of aluminium alloy in neutral solution, anodic reaction are the dissolving Al of aluminium alloy, Al
3++ 3e (1)
Cathodic reaction be oxygen as depolarizer, i.e. the reduction of oxygen, O
2+ H
2O+ 4e 4OH
-(2)
Zinc sulfate inhibiter in this research is a kind of strong acid weak base salt, and intensive hydrolytic action, SO take place in water
4 2-+ H
2O H
2SO
4+ 2OH
-(3)
The cathodic reaction of adding the zinc sulfate alloy obtains obvious suppression, the OH that the zinc sulfate hydrolysis is produced
-React the Al that dissolves with aluminum alloy anode
3+Generate Al (OH)
3Insolubles, and then be converted into Al
2O
33H
2O covers the surface of aluminium alloy, has promoted that aluminium is the passivation of alloy, suppresses the anodic reaction of aluminium alloy, has corrosion inhibition preferably.
A kind of organic carboxylate of sodium oleate, its molecular formula are C
17H
35COONa contains a hydrophobic nonpolar group-C
17H
35With a hydrophilic polar group-COO
-, its polar group is easy to be adsorbed on aluminum alloy surface, forms hydrophobic screen layer, thereby has shielded Cl
-Corrosion, play the effect of inhibition.
The synergy that zinc sulfate and sodium oleate share mainly shows: during single use zinc sulfate; Continuation increase along with zinc sulfate concentration; The hydrolytic action of zinc sulfate is strengthened; The pH value of solution increases; Can reach pH8～9; Because aluminium is amphoteric metal; In such pH value scope; Though at this moment passivation phenomenon has also appearred in white lake film that aluminum alloy surface generated or pellumina generation solvency action; But the white lake film on surface or pellumina also with very high speed dissolving, cause inhibition efficiency not high.But when sodium oleate existed, the screen layer that its polar group forms had not only shielded Cl
-Corrosion, suppressed the dissolving of solution that the pH value constantly changes simultaneously, thereby reached collaborative dual corrosion inhibition white lake film or pellumina.Putting before this, can reduce the working concentration of zinc sulfate and sodium oleate, when having avoided concentrations of sodium oleate higher, causing the caustic corrosion of aluminium alloy, playing attenuation, efficiently effect.
Characteristics of the present invention:
Corrosion inhibitor formula of the present invention has low toxicity, and is efficient, and economy does not influence the characteristics of original technical process.Zinc sulfate and sodium oleate itself have toxicity than characteristics low and stable in properties.When both single uses, inhibition efficiency is not high.Zinc sulfate of the present invention and sodium oleate are collaborative to be used, and has overcome the not high shortcoming of inhibition efficiency, has reduced the concentration of using simultaneously, thereby has reached low toxicity, efficient, economic effect.Our experimental result shows that the corrosion inhibition rate of corrosion inhibitor formula of the present invention all reaches more than 90%.
Embodiment
Embodiment 1
A kind of aluminium alloy inhibiter of neutral medium is characterized in that zinc sulfate 0. 1mg/g, sodium oleate 0. 1mg/g, sodium orthophosphate 0. 1mg/g, tallow amine 0. 1mg/g.
Embodiment 2
A kind of aluminium alloy inhibiter of neutral medium is characterized in that zinc sulfate 0. 2mg/g, sodium oleate 0. 1mg/g, sodium orthophosphate 0. 2mg/g, tallow amine 0. 15mg/g.
Embodiment 3
A kind of aluminium alloy inhibiter of neutral medium is characterized in that zinc sulfate 0. 15mg/g, sodium oleate 0. 2mg/g, sodium orthophosphate 0. 15mg/g, tallow amine 0. 2mg/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
Claims (1)
1. the aluminium alloy inhibiter of a neutral medium is characterized in that zinc sulfate 0. 1～0. 2mg/g, sodium oleate 0. 1～0. 2mg/g, sodium orthophosphate 0. 1～0. 2mg/g, tallow amine 0. 1～0. 2mg/g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110272091A CN102304717A (en) | 2011-09-15 | 2011-09-15 | Aluminum alloy corrosion inhibitor for neutral medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110272091A CN102304717A (en) | 2011-09-15 | 2011-09-15 | Aluminum alloy corrosion inhibitor for neutral medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102304717A true CN102304717A (en) | 2012-01-04 |
Family
ID=45378628
Family Applications (1)
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|---|---|---|---|
| CN201110272091A Pending CN102304717A (en) | 2011-09-15 | 2011-09-15 | Aluminum alloy corrosion inhibitor for neutral medium |
Country Status (1)
| Country | Link |
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| CN (1) | CN102304717A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031191A (en) * | 2012-12-17 | 2013-04-10 | 铜陵市东方矿冶机械有限责任公司 | Tallow amine gaseous phase sustained-release anti-rust oil and preparation method thereof |
| CN104674224A (en) * | 2015-03-18 | 2015-06-03 | 西南石油大学 | Composite corrosion inhibitor for corrosion protection of carbon steel in neutral medium |
| CN111430741A (en) * | 2020-04-13 | 2020-07-17 | 中国地质大学（武汉） | Alkaline electrolyte composite corrosion inhibitor and aluminum-air battery |
| CN111641009A (en) * | 2020-05-27 | 2020-09-08 | 湖南西瑞尔新材料科技有限公司 | Aluminum-air battery electrolyte, preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003078691A2 (en) * | 2002-03-15 | 2003-09-25 | Ecolab Inc. | Alkaline sensitive metal cleaning composition, method for cleaning an alkaline sensitive metal surface, and washing facility |
| CN1715451A (en) * | 2004-06-30 | 2006-01-04 | 上海万森水处理有限公司 | High efficiency corrosion inhibiting scale retardant |
| CN101280222A (en) * | 2008-06-02 | 2008-10-08 | 中国石油化工集团公司 | Water-soluble corrosion inhibitor, preparation and application thereof |
| CN101928077A (en) * | 2010-08-30 | 2010-12-29 | 天津精华石化有限公司 | Low-phosphorus corrosion and scale inhibitor |
-
2011
- 2011-09-15 CN CN201110272091A patent/CN102304717A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003078691A2 (en) * | 2002-03-15 | 2003-09-25 | Ecolab Inc. | Alkaline sensitive metal cleaning composition, method for cleaning an alkaline sensitive metal surface, and washing facility |
| CN1715451A (en) * | 2004-06-30 | 2006-01-04 | 上海万森水处理有限公司 | High efficiency corrosion inhibiting scale retardant |
| CN101280222A (en) * | 2008-06-02 | 2008-10-08 | 中国石油化工集团公司 | Water-soluble corrosion inhibitor, preparation and application thereof |
| CN101928077A (en) * | 2010-08-30 | 2010-12-29 | 天津精华石化有限公司 | Low-phosphorus corrosion and scale inhibitor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031191A (en) * | 2012-12-17 | 2013-04-10 | 铜陵市东方矿冶机械有限责任公司 | Tallow amine gaseous phase sustained-release anti-rust oil and preparation method thereof |
| CN103031191B (en) * | 2012-12-17 | 2014-04-16 | 铜陵市东方矿冶机械有限责任公司 | Tallow amine gaseous phase sustained-release anti-rust oil and preparation method thereof |
| CN104674224A (en) * | 2015-03-18 | 2015-06-03 | 西南石油大学 | Composite corrosion inhibitor for corrosion protection of carbon steel in neutral medium |
| CN111430741A (en) * | 2020-04-13 | 2020-07-17 | 中国地质大学（武汉） | Alkaline electrolyte composite corrosion inhibitor and aluminum-air battery |
| CN111641009A (en) * | 2020-05-27 | 2020-09-08 | 湖南西瑞尔新材料科技有限公司 | Aluminum-air battery electrolyte, preparation method and application thereof |
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120104 |