Hydrotalcite intercalation 2-amino-5-sulfhydryl-1,3,4-thiadiazole corrosion inhibitor and application thereof

A rust inhibitor and thiadiazole technology, applied in the field of rust inhibitors, can solve the problems of destroying the ecological environment, loss of rust inhibitors, single function, etc., and achieve the effects of small environmental side effects, corrosion prevention, and low dosage

Inactive Publication Date: 2018-05-04
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most commercial rust inhibitors have a single function, and some may even damage the ecological environment. In addition, rust inhibitors will be lost and invalidated if they exist in concrete for a long time
Although new corrosion inhibitors for steel bars have always been the focus of research by corrosion workers, new multi

Method used

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  • Hydrotalcite intercalation 2-amino-5-sulfhydryl-1,3,4-thiadiazole corrosion inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of hydrotalcite intercalated 2-amino-5-mercapto-1,3,4-thiadiazole rust inhibitor.

[0037] The first step: Synthesis of zinc aluminum hydrotalcite, the reaction is as follows:

[0038] Zn(NO 3 ) 2 ·6H 2 O+2NaOH=Zn(OH) 2 ↓+2NaNO 3 +6H 2 O(1)

[0039] Al(NO 3 ) 3 9H 2 O+3NaOH=Al(OH) 3 ↓+3NaNO 3 +9H 2 O (2)

[0040] 0.67Zn(OH) 2 +0.33Al(OH) 3 +mH 2 O+0.33NaNO 3

[0041] =[Zn 0.67 Al 0.33 (OH) 2 ][(NO 3 ) 0.33 mH 2 O]+0.33NaOH (3)

[0042] First, 14.85g Zn(NO 3 )2·6H 2 O and 9.38g Al(NO 3 )3·9H 2 O was dissolved in 100mL distilled water to obtain mixed salt solution A; then 25.5g NaNO 3 Dissolve in 200mL distilled water to obtain solution B; then dissolve 8g NaOH in 100mL distilled water to obtain alkaline solution C.

[0043] Next, slowly add solution A to solution B dropwise, and at the same time add dropwise alkaline solution C to maintain the pH of the mixed system = 10±0.5, during which the mixed system is vigorously stirred, a...

Embodiment 2

[0052] Obtain the antirust compound of above-mentioned embodiment and measure its antirust efficiency, specifically:

[0053] 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 component is zinc-aluminum hydrotalcite intercalation 2-amino-5- Mercapto-1,3,4-thiadiazole rust inhibitor, the medium is 3.5% sodium chloride solution, the dosage is 1L, the effective content of rust inhibitor added is 0.5g, the temperature is 25°C, pH=11.5, and the immersion time is 60 days.

[0054] According to the above-mentioned measurement method, the rust-inhibiting efficiency obtained through the experimental test is 89.1% in weight loss, 89.7% in electrochemical impedance spectroscopy, and 90.5% in the dynamical polarization curve, indicating that the compound is a rust inhibitor with low dosage and high efficiency.

Embodiment 3

[0056] 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 component is zinc-aluminum hydrotalcite intercalation 2-amino-5- Mercapto-1,3,4-thiadiazole rust inhibitor, the medium is 3.5% sodium chloride solution, the dosage is 1L, the effective content of rust inhibitor added is 1g, the temperature is 25°C, pH=11.5, and the immersion time is 60 sky.

[0057] According to the above-mentioned measurement method, the rust-inhibiting efficiency obtained through the experimental test is 91.5% for weight loss, 92.3% for electrochemical impedance spectroscopy, and 93.4% for potentiodynamic polarization curve, indicating that the compound is a rust inhibitor with low dosage and high efficiency.

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Abstract

The invention relates to a corrosion inhibitor, in particular to a hydrotalcite intercalation 2-amino-5-sulfhydryl-1,3,4-thiadiazole corrosion inhibitor and application thereof. Ion exchange is carried out between zinc-aluminum hydrotalcite layers, 2-amino-5-sulfhydryl-1,3,4-thiadiazole negative ions are intercalated in a hydrogen bond-electrostatic adsorption way, and the formed compound is the corrosion inhibitor. By adopting the corrosion inhibitor provided by the invention, mass production can be realized, controlled release and repairing of corroded carbon steel can be realized, and the corrosion inhibitor has long-term protective effect and can effectively carry out corrosion protection on the carbon steel, so that the corrosion inhibitor provided by the invention has obvious application value and a broad market prospect.

Description

technical field [0001] The invention relates to a rust inhibitor, in particular to a hydrotalcite intercalated 2-amino-5-mercapto-1,3,4-thiadiazole rust inhibitor and application thereof. Background technique [0002] Reinforced concrete is the main material of coastal and offshore engineering construction. Under 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 molecules. There are many ways to isolate chloride ion corrosion, steel rust inhibitor is the most simple, economical and efficient anti-corrosion technology. [0003] Steel bar rust inhibitor refers to chemical substances added to concrete or painted on the surface of concrete to prevent or slow down the corrosion of steel bars. At present, the research and application of corrosion inhibitors for steel bars are mainly divided into two categories: the doping type corrosion inhibitor (D...

Claims

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Application Information

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IPC IPC(8): C04B24/16C01G9/00C04B103/61
CPCC04B40/0046C01G9/006C04B2103/61C04B24/16C04B22/085
Inventor 李伟华刘昂田惠文
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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