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Heatproof anticorrosion coating with ion barrier ability and selectivity and preparation method thereof

An anti-corrosion coating and selective technology, which is applied in the anti-corrosion treatment of metal materials, heat-resistant anti-corrosion coating and its preparation field, can solve the problems of easy defects and large volume, and achieve simple preparation process, good application performance, prevent penetration effect

Inactive Publication Date: 2012-04-25
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the charged particles in the above-mentioned coating or film are micron-sized ion-exchange resins, which are relatively large in size, so that defects are prone to appear at the interface between them and the substrate, forming "pinholes". At the same time, ion-exchange resins have strong water absorption, which is a fatal flaw for coatings or membranes

Method used

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  • Heatproof anticorrosion coating with ion barrier ability and selectivity and preparation method thereof
  • Heatproof anticorrosion coating with ion barrier ability and selectivity and preparation method thereof
  • Heatproof anticorrosion coating with ion barrier ability and selectivity and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062]In the present embodiment 1, be to make the anticorrosion coating of the present invention outside the steel pipeline, and concrete process comprises:

[0063] Modification of hydrotalcite: take 10gMg-Al-LDH, dissolve in 300ml boiling (except CO 2 ) in the liquid (deionized water: ethanol = 1: 1, volume percentage), then transferred to a three-necked flask; under magnetic stirring at 80°C in a water bath, add 100ml of 0.1M sodium metavanadate solution, and stir at reflux temperature React for 2 hours, then adjust with 0.1M sodium hydroxide solution to make the solution pH=8.4, then allow the reaction product to cool naturally at room temperature, centrifuge, wash 3 times with ethanol and water mixture (volume percentage 1: 1), 80 ° C Vacuum dried for 24 hours and ground through a 200-mesh sieve. The Zeta potential of the obtained powder was measured to be 12 mV.

[0064] Add the modified hydrotalcite powder equivalent to 3% resin mass percentage to the mixture of bisph...

Embodiment 2

[0074] The coating preparation method of this embodiment 2 is the same as that of embodiment 1, except that the electrolyte solution is changed to 5% hydrochloric acid solution at 90° C., and the rest of the test conditions are the same.

[0075] For test results see Figure 7 , Figure 8a , Figure 8b and Figure 9 . Figure 7 Impedance-frequency relationship showing different immersion times for common epoxy coatings; Figure 8a and Figure 8b The impedance-frequency relationship of different immersion times for a single cation-selective coating and anion-selective coating; Figure 9 It is the impedance-frequency relationship of the anodic and anodic ion-selective coatings of the present invention at different immersion times. It can be found that the resistance value of ordinary epoxy coatings decreases rapidly with the extension of time, and the anti-corrosion effect of a single ion-selective coating is better than that of ordinary epoxy coatings, and the anti-corros...

Embodiment 3

[0077] The preparation method of the coating in Example 3 is the same as in Example 1, and the anti-corrosion performance of the coating under simulated working conditions was investigated in a high temperature and autoclave. The test conditions are: the temperature in the kettle is 135°C, the corrosion medium is 5% potassium chloride solution, the total pressure in the kettle is 2MPa, H 2 S gas partial pressure 0.4MPa, CO 2 The partial pressure is 1.6MPa, the oxygen is removed by high-purity nitrogen, and the test time is 5 days.

[0078] SEM and energy spectrum were used to observe the morphology and composition of corrosion products. For the test results, see Figures 10a-10d . The SEM image in the figure shows that the lower layer is the side close to the metal, and the upper layer is the side directly in contact with the corrosive medium. Severe swelling occurs after the pure epoxy coating is soaked, and the coating fails; there are only potassium ions and no chloride ...

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Abstract

The invention relates to a heatproof anticorrosion coating with the ion barrier ability and selectivity, a preparation method thereof, a purpose of the heatproof anticorrosion coating in metal materials, especially steel materials, and corresponding anticorrosion processing methods of the metal materials. The anticorrosion coating of the invention comprises an anionic selectivity layer and a cationic selectivity layer, wherein the anionic selectivity layer and the cationic selectivity layer are films comprising a matrix material and a layered inorganic material intercalation, the Zeta potential of the layered inorganic material is from -50mV to 50mV, and the matrix material is an anticorrosion polymer which is an epoxy resin, a phenolic resin, acrylic resin or a polyamide polymeric material. The anticorrosion coating of the invention, which can be applied to steel materials in a high chloride ion content corrosion environment, underground pipelines, sea platforms, seabed pipelines, steamships and the like, has a good anticorrosion performance.

Description

technical field [0001] The invention relates to the field of anti-corrosion treatment, in particular to a heat-resistant anti-corrosion coating with ion barrier and selectivity and a preparation method thereof. The anti-corrosion coating can be used in the heat-resistant anti-corrosion of metal materials, especially steel materials, And the corresponding anti-corrosion treatment method of metal materials. Background technique [0002] Metal materials are inevitably corroded by the surrounding environment during their service. Common methods to prevent corrosion of metal materials include electrochemical protection, coating or film protection, and corrosion inhibitor protection. Among them, organic coating or film anticorrosion has become one of the most commonly used methods for metal anticorrosion due to its simplicity and convenient construction. Commonly used organic coatings or films protect metals mainly through physical shielding. Due to the inherent characteristics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/02C09D161/10C09D5/08C09D7/12
Inventor 董玉华马丽琴周琼胡银春
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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