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Graphene-loaded thiadiazole corrosion inhibitor containing vanillin active group and application thereof

A technology of graphene and thiadiazole, which is applied in the field of rust inhibitors to achieve the effect of small environmental side effects, good durability, and long-term effect

Inactive Publication Date: 2017-12-05
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] At present, the focus of research and application of steel corrosion inhibitors is the organic migratory corrosion inhibitor (MCI), which can be used as a concrete additive for new construction, and can also be applied to in-service structures. Deep protection, however, looking at the mushrooming academic reports and market products, there is still no scientific and technological achievement comparable to the protection efficiency of the mixed-type nitrite steel passivator.

Method used

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  • Graphene-loaded thiadiazole corrosion inhibitor containing vanillin active group and application thereof
  • Graphene-loaded thiadiazole corrosion inhibitor containing vanillin active group and application thereof
  • Graphene-loaded thiadiazole corrosion inhibitor containing vanillin active group and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of graphene-supported thiadiazole complexes containing vanillin reactive groups.

[0045] Step 1: see figure 1 , to synthesize vanillin-[5-(p-methylphenyl)-1,3,4thiadiazole-2-mercapto]-acetylhydrazone, or to obtain it by referring to the method recorded in the prior art; specifically:

[0046] First, equimolar mixture of p-toluic acid and methanol, reaction dehydration to obtain methyl p-toluate (I). The product (I) was mixed with excess hydrazine hydrate and reacted in an oil bath at 80°C for 2 hours to obtain p-tolylhydrazide (II).

[0047] Then, the product (II) was reacted with excess carbon disulfide in KOH alkaline environment to generate compound (III). The product (III) was cyclized under the catalysis of concentrated sulfuric acid at an oil bath temperature of 80° C. for 1.5 h to obtain 2-mercapto-5-benzyl-[1,3,4]thiadiazole (IV). Product (IV) was reacted with excess ethyl chloroacetate under KOH basic condition to obtain (V).

[0048] Finally, ...

Embodiment 2

[0053] Obtain the antirust compound of above-mentioned embodiment and measure its antirust efficiency, specifically:

[0054] Conditions: The experimental material is carbon steel (Fe: 99.5%, Mn: 0.4-0.5%, C: 0.1-0.2%), and the effective rust inhibitor is a graphene-loaded thiadiazole compound containing vanillin active groups, The medium is 3.5% sodium chloride solution, the dosage is 100L, the effective content of the rust inhibitor compound is 20mg, the temperature is 35°C, pH=11.5, and the immersion time is 60 days.

[0055] The rust-inhibiting efficiencies obtained through experimental tests are 91.3% in weight loss, 92.8% in electrochemical impedance spectroscopy, and 93.5% in dynamic potential polarization curves, indicating that the compound is a rust inhibitor with low dosage and high efficiency.

Embodiment 3

[0057] Conditions: The experimental material is carbon steel (Fe: 99.5%, Mn: 0.4-0.5%, C: 0.1-0.2%), and the effective rust inhibitor is a graphene-loaded thiadiazole compound containing vanillin active groups, The medium is 3.5% sodium chloride solution, the dosage is 100L, the effective content of rust inhibitor compound is 50mg, the temperature is 35°C, pH=11.5, and the immersion time is 60 days.

[0058] The rust-inhibiting efficiencies obtained through experimental tests are 94.0% in weight loss, 95.7% in electrochemical impedance spectroscopy, and 96.6% in dynamic potential polarization curves, indicating that the compound is a rust inhibitor with low dosage and high efficiency.

[0059] Example 3

[0060] Conditions: The experimental material is carbon steel (Fe: 99.5%, Mn: 0.4-0.5%, C: 0.1-0.2%), and the effective rust inhibitor is a graphene-loaded thiadiazole compound containing vanillin active groups, The medium is 3.5% sodium chloride solution, the dosage is 100L,...

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Abstract

The invention relates to a corrosion inhibitor, specifically to a graphene-loaded thiadiazole corrosion inhibitor containing vanillin active group and application thereof. The compound is a compound formed after chemical loading of vanillin-[5-(p-methylphenyl)-1,3,4 thiadiazole-2-mercapto]-acetylhydrazone on active site of oxygen-containing functional group in a graphene molecular layer. The compound is applied in an alkaline environment of concrete or under a corresponding alkaline condition to carry out corrosion prevention on a carbon steel material and rebar products in seawater or a sodium chloride medium through the graphene molecular layer catalyzing a cathodic oxygen reduction reaction during the electrochemical process between a corrosion inhibitor and carbon steel. The corrosion inhibitor of the invention has wide sources, is easy for mass production, has less dosage, efficient performance and strong sustained action, can effectively inhibit corrosion damage to carbon steel, and has remarkable application value and wide market prospect.

Description

technical field [0001] The invention relates to a rust inhibitor, in particular to a graphene-supported thiadiazole rust inhibitor containing a vanillin active group and an application thereof. Background technique [0002] Reinforced concrete is the main material of coastal and offshore engineering construction. Under the marine corrosion environment, the corrosion of steel bars caused by the penetration of high-concentration chloride ions is the primary factor leading to the deterioration of concrete structures. There are many ways to isolate chloride ion corrosion, steel rust inhibitor is the most simple, economical and efficient anti-corrosion technology. [0003] At present, the focus of research and application of steel corrosion inhibitors is the organic migratory corrosion inhibitor (MCI), which can be used as a concrete additive for new construction, and can also be applied to in-service structures. Deep protection, however, looking at the mushrooming academic repo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D285/125C23F11/16
Inventor 田惠文李伟华侯磊侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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