CN102140641A - Green sodium alginate corrosion inhibitor for carbon steel neutral medium and application thereof - Google Patents
Green sodium alginate corrosion inhibitor for carbon steel neutral medium and application thereof Download PDFInfo
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- CN102140641A CN102140641A CN2011100417266A CN201110041726A CN102140641A CN 102140641 A CN102140641 A CN 102140641A CN 2011100417266 A CN2011100417266 A CN 2011100417266A CN 201110041726 A CN201110041726 A CN 201110041726A CN 102140641 A CN102140641 A CN 102140641A
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- corrosion inhibitor
- neutral medium
- sodium alginate
- inhibiter
- carbon steel
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Abstract
The invention relates to a corrosion inhibitor for a steel neutral medium, particularly relating to a green sodium alginate corrosion inhibitor for a carbon steel neutral medium as well as an application thereof. The corrosion inhibitor is sodium alginate of which the chemical general formula is (C6H7NaO6)n and the average molecular weight (Mw) is 20000-100000. The sodium alginate corrosion inhibitor disclosed by the invention is a natural product extracted from brown algae, and is widely applied to food industry. The corrosion inhibitor is a copolymer formed by connecting alpha-L-mannuronic acid (M units) with beta-D-guluronic acid through 1,4-glucosidic bonds and composed of different GGGMMM fragments. The alpha-L-mannuronic acid unit contains a large amount of carboxyl and can be coordinated with metals. Compared with the current commonly-used organic corrosion inhibitor, the corrosion inhibitor disclosed by the invention is non-toxic and harmless, thereby having no environmental problem after use. In addition, the corrosion inhibitor is non-toxic and harmless to environment and living beings, thus conforming to development of green corrosion inhibitors.
Description
Technical field
The present invention relates to steel neutral medium inhibiter, inhibiter and application thereof that specifically a kind of green algae acid sodium carbon steel neutral medium is used.
Background technology
Metallic corrosion spreads all over national economy and national defense construction every field, endangers very serious.Different with natural disaster, can reduce because the loss that corrosion causes by certain methods.In metal protection, use inhibiter, because advantages such as its consumption is little, price is low, the source is wide, effective and highly versatile make it occupy critical role in various means of defences.
In the inhibiter commonly used at present, mainly comprise mineral compound such as chromic salt, nitrate, nitrite, because it has toxic side effect, environment friendly is poor, and its application is being restricted and will progressively eliminating.Recently, along with the enhancing of people's environmental consciousness, and the environmental regulation of increasingly stringent, inhibiter also more and more develops towards greenization.And green corrosion inhibitor environmental sound in the use not only, produce and manufacturing processed in also should be eco-friendly.Therefore, efficient, the environmental friendliness of development of new, cheapness, the green corrosion inhibitor that is easy to get have higher productive value and wide market outlook.
Summary of the invention
The purpose of this invention is to provide inhibiter and application thereof that a kind of green algae acid sodium carbon steel neutral medium is used.
For achieving the above object, the technical solution used in the present invention is:
The inhibiter that a kind of green algae acid sodium carbon steel neutral medium is used: inhibiter is (C for the chemical constitution general formula
6H
7NaO
6)
n, weight in average (Mw) is the sodium alginate of 20000～100000 (20000,30000,40000,50000,80000,90000 or 100000).
The application of the inhibiter that green algae acid sodium carbon steel neutral medium is used: described is the application that the inhibiter of composition is used for preventing Corrosion Of Steel with the sodium alginate.
With the neutral medium solution submergence steel that are added with the inhibiter sodium alginate; The amount that wherein adds inhibiter in every liter of neutral medium solution is 0.06g～1.00g (0.06g, 0.08g, 0.1g, 0.3g, 0.5g, 0.8g or 1.0g), the submergence temperature is a room temperature, time 0.5～4h (0.5h, 1h, 1.5h, 2h, 2.5h, 3h, 3.5h or 4h); Wherein: neutral medium solution is the NaCl aqueous solution, and mass concentration is 3.0～4.0%.
The advantage that the present invention had:
1. cost is low.
2. environmental friendliness.It is the natural product that extracts from brown alga for a sodium alginate inhibiter of the present invention, and it is widely used in foodstuffs industry.It is to rely on 1 by α-L-mannuronic acid (M unit) and β-D-guluronic acid (G unit), connection of 4-glycosidic link and the multipolymer of being made up of different GGGMMM fragments.A-L-mannuronic acid unit contains a large amount of carboxyls, can with metal-complexing.Compare with inorganic inhibitor at present commonly used, nontoxic, there is not the environmental problem after the use; Harmless to environment and biological nontoxic, meet the trend that green corrosion inhibitor develops.
3. consumption is low, and result of use is good.The present invention adds a small amount of inhibiter can effectively suppress the corrosion of metallic substance in neutral medium, has the outstanding advantage that consumption is low, inhibition efficiency is high, continuous action ability is strong.
Description of drawings
Fig. 1 is containing and the Ta Feier polarization curve that does not contain in the 0.5g/L sodium alginate 3.5%NaCl solution for the carbon steel that the embodiment of the invention provided.(X-coordinate-electric current wherein, the mAcm of unit
-2(every square centimeter of milliampere), ordinate zou-voltage, the V of unit (volt)).
Embodiment
Embodiment 1
With the neutral medium NaCl solution that the is added with the inhibiter sodium alginate packaged carbon steel electrode 0.5h of submergence at ambient temperature; The amount that wherein adds inhibiter in every liter of neutral medium NaCl solution is 0.5g, neutral medium NaCl solution, and mass concentration is 3.5%.Sodium alginate Mw is 50000.
Inhibition efficiency (referring to Fig. 1) by Ta Feier polarization curve test acquisition:
Carbon steel electrode as working electrode, is adopted
Epoxy encapsulation, electrodes exposed area 0.196cm
2, platinum wire electrode is a supporting electrode, and silver/silver chloride (Ag/AgCl, 3M KCl) electrode is a reference electrode, and NaCl solution is ionogen, is assembled into three electrode test systems.Utilize the U.S. 760C of CHI company type electrochemical workstation to carry out the test of Ta Feier polarization curve, test potential is-300 to 300mV (vs.E
Oc) (E
OcBe open circuit potential), sweep velocity 0.5mV/s.In polarization method, equation 1 is used to calculate inhibition efficiency (η
p), i ' wherein
CorrAnd i
CorrBe respectively to have and do not have the current density of inhibiter under existing.
Analytical results shows that this inhibiter has fine corrosion mitigating effect to carbon steel in neutral medium, and inhibition efficiency is shown as high-efficient corrosion inhibitor greater than 90%.
Wherein sodium alginate is the natural product of a kind of extraction in brown alga, and it is widely used in foodstuffs industry.Its preparation process is referring to document (J.L.Drury et al., Biomaterials, 2003,24,4337) report in, it is to rely on 1 by α-L-mannuronic acid (M unit) and β-D-guluronic acid (G unit), connection of 4-glycosidic link and the multipolymer of being made up of different GGGMMM fragments.A-L-mannuronic acid unit contains a large amount of carboxyls, can with metal-complexing.
Embodiment 2
With the neutral medium NaCl solution that the is added with the inhibiter sodium alginate packaged carbon steel electrode 2h of submergence at ambient temperature; The amount that wherein adds inhibiter in every liter of neutral medium NaCl solution is 0.06g, neutral medium NaCl solution, and mass concentration is 4%.Sodium alginate Mw is 100000.
The inhibition efficiency that obtains by Ta Feier polarization curve test is shown as high-efficient corrosion inhibitor greater than 80%.
Embodiment 3:
With the neutral medium NaCl solution that the is added with the inhibiter sodium alginate packaged carbon steel electrode 2h of submergence at ambient temperature; The amount that wherein adds inhibiter in every liter of neutral medium NaCl solution is 1.00g, neutral medium NaCl solution, and mass concentration is 3.0%.Sodium alginate Mw is 20000.
The inhibition efficiency that obtains by Ta Feier polarization curve test is shown as high-efficient corrosion inhibitor greater than 90%.
Neutral solution is NaCl solution, and mass concentration is 3.0%, and consumption 1L adds sodium alginate (Mw=20000) 1.00g, at ambient temperature packaged carbon steel electrode is immersed in 4h in the 3.0%NaCl solution.
Embodiment 4:
Inhibiter is (C for the chemical constitution general formula
6H
7NaO
6)
n, weight in average (Mw) is the sodium alginate of 20000～100000 (20000,30000,40000,50000,80000,90000 or 100000).
With the neutral medium solution submergence steel that are added with the inhibiter sodium alginate; The amount that wherein adds inhibiter in every liter of neutral medium solution is 0.06g～1.00g (0.06g, 0.08g, 0.1g, 0.3g, 0.5g, 0.8g or 1.0g), the submergence temperature is a room temperature, time 0.5～4h (0.5h, 1h, 1.5h, 2h, 2.5h, 3h, 3.5h or 4h); Wherein: neutral medium solution is the NaCl aqueous solution, and mass concentration is 3.0～4.0%.
The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (3)
1. the inhibiter used of green algae acid sodium carbon steel neutral medium, it is characterized in that: inhibiter is (C for the chemical constitution general formula
6H
7NaO
6)
n, weight in average (Mw) is the sodium alginate of 20000-100000.
2. the application of the inhibiter used of green algae acid sodium carbon steel neutral medium is characterized in that: described is the application that the inhibiter of composition is used for preventing Corrosion Of Steel with the sodium alginate.
3. the application of the inhibiter of using by the described green algae of claim 1 acid sodium carbon steel neutral medium is characterized in that: with the neutral medium solution submergence steel that are added with the inhibiter sodium alginate; The amount that wherein adds inhibiter in every liter of neutral medium solution is 0.06g-1.00g, and the submergence temperature is a room temperature, time 0.5-4h; Wherein: neutral medium solution is the NaCl aqueous solution, and mass concentration is 3.0-4.0%.
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| CN2011100417266A CN102140641A (en) | 2011-02-18 | 2011-02-18 | Green sodium alginate corrosion inhibitor for carbon steel neutral medium and application thereof |
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| CN2011100417266A CN102140641A (en) | 2011-02-18 | 2011-02-18 | Green sodium alginate corrosion inhibitor for carbon steel neutral medium and application thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102583785A (en) * | 2012-02-03 | 2012-07-18 | 上海韬鸿化工科技有限公司 | Circulating cooling water corrosion inhibitor, and preparation and application thereof |
| CN103806004A (en) * | 2014-02-25 | 2014-05-21 | 山东省科学院能源研究所 | Heat exchange working medium for solar water heater |
| CN106082748A (en) * | 2016-06-26 | 2016-11-09 | 陈毅忠 | A kind of preparation method of biological reinforcing steel bar corrosion inhibitor |
| CN106498403A (en) * | 2016-10-13 | 2017-03-15 | 威海云睿信息科技有限公司 | A kind of copper inhibitor |
| CN112342535A (en) * | 2020-09-25 | 2021-02-09 | 华帝股份有限公司 | Super-hydrophilic surface treating agent and preparation method and application thereof |
| CN112376050A (en) * | 2020-11-15 | 2021-02-19 | 西安热工研究院有限公司 | Carbon steel and aluminum corrosion inhibitor |
-
2011
- 2011-02-18 CN CN2011100417266A patent/CN102140641A/en active Pending
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102583785A (en) * | 2012-02-03 | 2012-07-18 | 上海韬鸿化工科技有限公司 | Circulating cooling water corrosion inhibitor, and preparation and application thereof |
| CN102583785B (en) * | 2012-02-03 | 2013-05-08 | 上海韬鸿化工科技有限公司 | Circulating cooling water corrosion inhibitor, and preparation and application thereof |
| CN103806004A (en) * | 2014-02-25 | 2014-05-21 | 山东省科学院能源研究所 | Heat exchange working medium for solar water heater |
| CN103806004B (en) * | 2014-02-25 | 2015-09-30 | 山东省科学院能源研究所 | Solar water heater heat-exchange working medium |
| CN106082748A (en) * | 2016-06-26 | 2016-11-09 | 陈毅忠 | A kind of preparation method of biological reinforcing steel bar corrosion inhibitor |
| CN106498403A (en) * | 2016-10-13 | 2017-03-15 | 威海云睿信息科技有限公司 | A kind of copper inhibitor |
| CN112342535A (en) * | 2020-09-25 | 2021-02-09 | 华帝股份有限公司 | Super-hydrophilic surface treating agent and preparation method and application thereof |
| CN112376050A (en) * | 2020-11-15 | 2021-02-19 | 西安热工研究院有限公司 | Carbon steel and aluminum corrosion inhibitor |
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Application publication date: 20110803 |