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Hybrid material hole sealing agent for improving corrosion resistance of plasma spraying coating in acid environment

A hybrid material, ion spraying technology, used in coatings, metal material coating processes, melt spraying and other directions, can solve the problems of reducing coating porosity, poor toughness of inorganic sealing agents, high electrochemical corrosion voltage, etc. , to achieve the effect of good sealing effect and strong acid corrosion resistance

Inactive Publication Date: 2013-07-03
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the serious environmental pollution of organic sealing agents and the poor toughness of inorganic sealing agents, the object of the present invention is to provide an organic-inorganic hybrid material sealing agent for improving the acid corrosion resistance of plasma sprayed coatings. A hybrid sealing agent with good sealing effect and strong corrosion resistance is prepared by using the sol-gel method, which has the characteristics of reducing the porosity of the coating, low electrochemical corrosion current, and high electrochemical corrosion voltage.

Method used

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  • Hybrid material hole sealing agent for improving corrosion resistance of plasma spraying coating in acid environment
  • Hybrid material hole sealing agent for improving corrosion resistance of plasma spraying coating in acid environment
  • Hybrid material hole sealing agent for improving corrosion resistance of plasma spraying coating in acid environment

Examples

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Effect test

Embodiment 1

[0020] Embodiment 1: Improving the hybrid material sealing agent of plasma spray coating corrosion resistance under acidic environment

[0021] A hybrid material sealing agent for improving the corrosion resistance of plasma sprayed coatings in an acidic environment, characterized in that the hybrid material sealing agent is composed of analytically pure tetraethyl orthosilicate, absolute ethanol, N,N- Dimethylformamide, chemically pure γ-methacryloxypropyl trimethoxysilane, 25vol.% nitric acid, 25vol.% ammonia water, distilled water reagent, the proportion by volume is: ethyl orthosilicate : absolute ethanol: distilled water: γ-methacryloxypropyltrimethoxysilane=4: 3: 1: 6, N,N-dimethylformamide volume is tetraethyl orthosilicate, anhydrous The amount of ethanol, distilled water and γ-methacryloxypropyltrimethoxysilane reagent is 30% of the total volume. Among them, 25vol.% nitric acid was used to adjust the pH value in the process of hydrolysis and condensation of ethyl tet...

Embodiment 2

[0027] Embodiment 2: Improving the hybrid material sealing agent of plasma spray coating corrosion resistance under acidic environment

[0028] A hybrid material sealing agent for improving the corrosion resistance of plasma sprayed coatings in an acidic environment, characterized in that the hybrid material sealing agent is composed of analytically pure tetraethyl orthosilicate, absolute ethanol, N,N- Dimethylformamide, chemically pure γ-methacryloxypropyl trimethoxysilane, 25vol.% nitric acid, 25vol.% ammonia water, distilled water reagent, the proportion by volume is: ethyl orthosilicate : absolute ethanol: distilled water: γ-methacryloxypropyltrimethoxysilane=4: 3: 1: 4, N,N-dimethylformamide volume is tetraethyl orthosilicate, anhydrous The amount of ethanol, distilled water and γ-methacryloxypropyltrimethoxysilane reagent is 20% of the total volume. Among them, 25vol.% nitric acid was used to adjust the pH value in the process of hydrolysis and condensation of ethyl tet...

Embodiment 3

[0034]Embodiment 3: the sealing treatment of plasma spray coating

[0035] After the hybrid material sealing agent prepared in Example 1 was left to age for 1 hour, sealing treatment was performed. Put the plasma sprayed sample into the sealing agent, soak for 20-30min, take it out and dry it in the air, then bake it in the oven at 100°C, the sealing agent is completely dry, take the sample out of the oven, and dry it in the air Cool to room temperature, use 1200# sandpaper to grind the resin on the surface of the coating, and then soak it in the prepared hybrid sealing agent, the steps are as above, and finally grind off the sealed coating with 1200# sandpaper Excess resin on the coating surface, set aside;

[0036] The surface morphology of the plasma sprayed coating after the sealing treatment of embodiment 3 is as follows figure 1 shown. It can be seen that after sealing the plasma sprayed coating with the prepared sealing agent, the sealing agent forms a uniform and co...

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Abstract

A hybrid material hole sealing agent for improving corrosion resistance of a plasma spraying coating in acid environment is composed of the following components: ethyl orthosilicate, anhydrous ethanol, N,N-Dimethylformamide, Gama-methacryloxy propyl trimethoxyl silane, 25vol.% nitric acid, 25vol.% ammonia water and distilled water, wherein the proportion according to volume ration of ethyl orthosilicate to anhydrous ethanol to N,N-Dimethylformamide to distilled water to Gama-methacryloxy propyl trimethoxyl silane is equal to 4:3:1:(4-6), and the volume of N,N-Dimethylformamide is 20% to 30% of the total volume of ethyl orthosilicate, anhydrous ethanol, distilled water and Gama-methacryloxy propyl trimethoxyl silane; and the hybrid material hole sealing agent is prepared with a sol-gel method, wherein the 25vol.% nitric acid and 25vol.% ammonia water are used as pH regulators. The porosity factor of the plasma spraying coating processed by using the hybrid material hole sealing agent is reduced to 1 / 40 to 9 / 250 of that of a coating with unsealed holes, the electrochemical corrosion potential is increased by 65.2% to 65.8% of that of the coating with unsealed holes, and the corrosion current density is reduced to 1 / 370 to 1 / 500 of that of the coating with unsealed holes.

Description

technical field [0001] The invention relates to a hybrid material sealing agent for improving the corrosion resistance of plasma sprayed coatings in an acidic environment, and belongs to the technical field of material corrosion and protection. It is mainly used for the sealing treatment of plasma sprayed coatings, and can be applied to the long-term anti-corrosion environment of metal structures. Background technique [0002] The organic sealing agent is composed of a main agent and a solvent. The main agent is generally selected from vinyl resin, phenolic resin, epoxy resin, silicone resin, etc., and the solvent is generally selected from alcohols, aromatic hydrocarbons, esters, etc. Organic sealing agents are generally volatile and flammable, so care must be taken during the sealing operation. There are two types of organic sealing agents: room temperature hardening and heating hardening. According to the sealing requirements and shape characteristics of different parts,...

Claims

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Application Information

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IPC IPC(8): C23C4/18C08G77/04
Inventor 周泽华刘立群王泽华邵佳易于张晶晶王国伟丁莹
Owner HOHAI UNIV
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