Metal organic formwork corrosion inhibitor-hydrogel compound with Fe2+ response characteristic, and preparation method and application thereof

Abstract

The invention discloses a metal organic formwork corrosion inhibitor-hydrogel compound with a Fe2+ response characteristic, and a preparation method and application thereof. The metal organic formworkcorrosion inhibitor-hydrogel compound is composed of polyvinyl alcohol hydrogel and a copper-based carboxylic acid metal organic formwork doped in the hydrogel and encapsulated with a 1H-1,2,4-triazole-3-thiol corrosion inhibitor. The preparation method includes the steps that firstly, in-situ encapsulation of a corrosion inhibitor guest in a metal organic formwork encapsulation solution is achieved through a one-pot synthesis method, then an encapsulation precursor is doped into the polyvinyl alcohol hydrogel, the growth rate of a nanoshell is decreased through the coordination effect of a hydrogel monomer and a metal center in the metal organic formwork, thus the integration of a formwork structure is improved, high-capacity encapsulation of the corrosion inhibitor is achieved finally,and the high-load hydrogel compound of the metal organic formwork encapsulation corrosion inhibitor is formed. The corrosion inhibition compound can be applied to a seawater corrosion engineering structure, a main characteristic product of carbon steel corrosion in a seawater environment is free divalent iron ions, the ions are replaced with the center of cetyl trimethyl ammonium positive ions ofthe metal organic formwork, thus the outer surface hole diameter of a frame can be enlarged, the corrosion inhibitor encapsulated inside is released, and target protection of the corrosion area is achieved. By adopting a corrosion inhibition system, the targeting ability is high, the efficient and durable effects are achieved, cost performance is high, and significant application value and broad market prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of marine iron and steel anticorrosion coating materials, more specifically, a 2+ Metal-organic framework corrosion inhibitor-hydrogel composites with responsive properties, their preparation methods and applications. Background technique [0002] With the development and utilization of marine resources, the amount of steel used in various large-scale marine components and shipbuilding steel has increased significantly, and the corrosion of steel materials in the marine environment has become an increasingly concerned issue. Due to its low price and good processing performance, carbon steel is the most widely used material in marine engineering. However, carbon steel is a kind of multi-metal alloy material. When the material is immersed in seawater medium, the potential difference between the metals will cause the galvanic current to flow between the metals, resulting in the protection of the metal with a r...

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Problems solved by technology

[0004] Although the use of nano-microcapsules to encapsulate corrosion inhibitors to achieve controllable release of target molecules has been widely reported, most of them are limited to doping microcapsules in brittle coatings such as epoxy resins, which are easily damaged by various stresses.

At the same time, the corrosion inhibition effect of this type of coating system is usually based on the release of the corrosion inhibitor from the microcapsules due to the stress cracking of the coating. However, the corrosion inhibitor itself has poor compatibility with epoxy resin and cannot diffuse well into the corrosion source. point of origin protection

On the other hand, the dispersibility of microcapsules in coatings such as epoxy resin also greatly limits its corrosion inhibition performance.

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