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Green sodium alginate corrosion inhibitor for carbon steel neutral medium and application thereof

The technology of sodium alginate and neutral medium is applied in the field of corrosion inhibitor for neutral medium of green sodium alginate carbon steel, which can solve the problems of toxic and side effects, poor environmental friendliness, etc. Low dosage effect

Inactive Publication Date: 2011-08-03
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently commonly used corrosion inhibitors mainly include inorganic compounds such as chromate, nitrate, and nitrite. Due to their toxic side effects and poor environmental friendliness, their application is being restricted and will be phased out.

Method used

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  • Green sodium alginate corrosion inhibitor for carbon steel neutral medium and application thereof
  • Green sodium alginate corrosion inhibitor for carbon steel neutral medium and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Immerse the packaged carbon steel electrode with the neutral medium NaCl solution added with the corrosion inhibitor sodium alginate for 0.5h at room temperature; the amount of the corrosion inhibitor added to each liter of the neutral medium NaCl solution is 0.5g, neutral Medium NaCl solution, the mass concentration is 3.5%. Sodium alginate Mw is 50000.

[0016] The corrosion inhibition efficiency obtained by the Tafel polarization curve test (see figure 1 ):

[0017] A carbon steel electrode was used as the working electrode, using Epoxy resin package, electrode exposure area 0.196cm 2 , platinum wire electrode as auxiliary electrode, silver / silver chloride (Ag / AgCl, 3M KCl) electrode as reference electrode, NaCl solution as electrolyte, assembled into a three-electrode test system. Using the 760C electrochemical workstation of CHI Company of the United States to carry out the Tafel polarization curve test, the test potential is -300 to 300mV (vs.E oc )(E oc is...

Embodiment 2

[0022] Immerse the packaged carbon steel electrode with the neutral medium NaCl solution added with the corrosion inhibitor sodium alginate for 2 hours at room temperature; the amount of the corrosion inhibitor added to each liter of the neutral medium NaCl solution is 0.06g, and the neutral medium NaCl solution, the mass concentration is 4%. The Mw of sodium alginate is 100000.

[0023] The corrosion inhibition efficiency obtained by the Tafel polarization curve test is greater than 80%, showing that it is an efficient corrosion inhibitor.

Embodiment 3

[0025] Immerse the packaged carbon steel electrode with the neutral medium NaCl solution added with the corrosion inhibitor sodium alginate for 2 hours at room temperature; the amount of the corrosion inhibitor added to each liter of the neutral medium NaCl solution is 1.00g, and the neutral medium NaCl solution, the mass concentration is 3.0%. Sodium alginate Mw is 20000.

[0026] The corrosion inhibition efficiency obtained by the Tafel polarization curve test is greater than 90%, showing that it is an efficient corrosion inhibitor.

[0027] The neutral solution is NaCl solution, the mass concentration is 3.0%, the dosage is 1L, sodium alginate (Mw=20000) 1.00g is added, and the packaged carbon steel electrode is immersed in the 3.0% NaCl solution for 4 hours at room temperature.

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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 [0001] The invention relates to a corrosion inhibitor for steel neutral medium, in particular to a corrosion inhibitor for green sodium alginate carbon steel neutral medium and application thereof. Background technique [0002] Metal corrosion pervades all fields of national economy and national defense construction, and the harm is very serious. Unlike natural disasters, losses due to corrosion can be reduced in a number of ways. The use of corrosion inhibitors in metal protection occupies an important position in various protection methods due to its advantages of small dosage, low price, wide source, good effect and strong versatility. [0003] Currently commonly used corrosion inhibitors mainly include inorganic compounds such as chromate, nitrate, and nitrite. Due to their toxic side effects and poor environmental friendliness, their application is being restricted and will be phased out. Recently, with the enhancement of people's awareness of environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/173
Inventor 王毅张盾
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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