Surface application composite migration corrosion inhibitor and preparation method thereof

A rust inhibitor and composite technology, which is applied in the field of surface application composite migration rust inhibitor and its preparation, can solve the problem of less surface application, and achieve the effects of simple preparation method, small environmental side effects, and wide sources

Inactive Publication Date: 2021-08-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the technical problems in the prior art that most of the concrete anti-corrosion products at home and abroad are internally mixed, while the surface-applied ones are less, and provide a surface-applied composite migration anti-corrosion agent

Method used

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  • Surface application composite migration corrosion inhibitor and preparation method thereof
  • Surface application composite migration corrosion inhibitor and preparation method thereof
  • Surface application composite migration corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 8 g of triethanolamine and 40 g of deionized water were thoroughly mixed in a glass container at room temperature to obtain a triethanolamine solution. In a beaker, mix 2 g of diethanol monoisopropanolamine, 1 g of diethanolamine, and 15 g of water in a 20ml centrifuge tube, stir with a glass rod, and centrifuge to obtain the supernatant to obtain a mixed solution A. A is slowly added dropwise into the glassware containing the triethanolamine solution B, stirred until evenly mixed, and then sealed to obtain a surface-applied composite migration rust inhibitor organic component precursor. Add 1g of sodium nitrite and 33g of water to the above-mentioned equivalent organic component precursor, stir evenly and store in a sealed tank to obtain a finished surface-applied migration-type rust inhibitor. The entire test process needs to be maintained at room temperature ( Carry out at 25±1)°C; when used in an alkaline environment, add 0.15g per liter of water into chlorine-free ...

Embodiment 2

[0042] At room temperature, 8 g of triethanolamine and 40 g of deionized water were fully mixed in a hydrothermal reaction kettle to obtain a triethanolamine solution. In a beaker, mix 2 g of diethanol monoisopropanolamine, 1 g of diethanolamine, and 15 g of water in a 20ml centrifuge tube, stir with a glass rod, and centrifuge to obtain the supernatant to obtain a mixed solution A. A is slowly added dropwise into the glassware containing the triethanolamine solution B, stirred until evenly mixed, and then sealed to obtain a surface-applied composite migration rust inhibitor organic component precursor. Add 1g of sodium nitrite and 33g of water to the above-mentioned equivalent organic component precursor, stir evenly and store in a sealed tank to obtain a finished surface-applied migration-type rust inhibitor. The entire test process needs to be maintained at room temperature ( Carry out at 25±1)°C; when used in an alkaline environment, add 0.2g per liter of water into chlori...

experiment example

[0044] First, the steel bar is immersed in the concrete simulation solution with a pH of 12.68 for 180d to simulate the process of forming a stable passivation film of the steel bar in the actual concrete. Then add, 0.15g / L and 1.5g / L embodiment 1 and the surface application migration type rust inhibitor of embodiment 2, reference sample does not add the surface application migration type rust inhibitor as a control group, after 12 hours with NaCl As a chlorine source, a gradient addition is added every hour to increase the concentration of chloride ions around the steel reinforcement in the simulated liquid, and before the next addition of chloride ions, two kinds of electrochemical tests, including open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS), are performed. The US ASTM C876 standard conducts half-cell potential testing to evaluate the rust-inhibiting performance of the surface-applied migratory rust inhibitor. The test results of electrochem...

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Abstract

The invention relates to the technical field of building materials, in particular to a surface application composite migration corrosion inhibitor and a preparation method thereof. The surface application composite migration corrosion inhibitor comprises an organic component, an inorganic component and water, the organic component is formed by compounding diethanolisopropanolamine and alkylol amine Nn, the inorganic component is nitrite, and n is a natural number. The corrosion inhibitor can be used for corrosion media chloride ions and sulfate ions at the same time, and the defects that a traditional corrosion inhibitor is large in dosage, low in efficiency and single in effect are overcome. The triethanolamine and other alcohol amine components make up the risk of accelerated corrosion caused by insufficient mixing amount of sodium nitrite, and sodium nitrite makes up the possibility of corrosion inhibitor failure after the organic components are degraded under concrete or corresponding alkaline conditions. The organic component and the inorganic component are used together, and the double protection effect is achieved for the steel bar corrosion problem. The surface application composite migration corrosion inhibitor serves as an external component and can perform corrosion protection on an existing reinforced concrete structure in an external coating mode.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a surface-applied composite migration rust inhibitor and a preparation method thereof. Background technique [0002] In the marine environment, the economic loss caused by the corrosion of steel bars in concrete caused by chloride ions is becoming more and more serious. Some studies have shown that 0.6kg of chloride ions per cubic meter of concrete will lead to the depassivation of steel bars. In the first stage of the corrosion process of chloride ions on concrete, the diffusion of chloride ions leads to the continuous accumulation of chloride ion concentration on the surface of steel bars. When the concentration reaches a critical value, the passive film of steel bars will be destroyed, and the steel bars in concrete will corrode. start happening. In the second stage, the effective cross-section of the steel bar is continuously reduced, and the concrete protective l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B103/61
CPCC04B40/0039C04B2103/61C04B24/122C04B22/085
Inventor 李伟华李佳祺郑海兵陈梦竹
Owner SUN YAT SEN UNIV
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