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A method for controlling corrosion under insulation layer

A technology of corrosion under the insulation layer and insulation layer, applied in the directions of insulation, weather resistance/light resistance/corrosion resistance, coating, etc., can solve the problems of design defects, early failure of coating, corrosion of insulation layer, etc., and achieve excellent overall economy. , the effect of optimizing maintenance strategies and reducing operation and maintenance costs

Active Publication Date: 2022-05-24
SUZHOU NUCLEAR POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, there are two ways to solve the problem of corrosion under the insulation layer: one is to improve the performance of the insulation layer, such as selecting insulation materials with low water content and fast drying, to enhance the performance of the protective layer to prevent moisture from entering Insulation layer, but there is no insulation layer that can completely isolate moisture in practical applications. At the same time, due to design defects or insulation installation and maintenance problems, moisture directly enters the insulation layer
The second is to apply ordinary anti-corrosion coatings on the metal surface, but due to the performance factors of the coating itself, such as the thermal expansion coefficient is different from that of the metal, the thermal cycle will often lead to an increase in the internal stress of the coating, which will eventually cause early failure of the coating. It cannot effectively solve the corrosion problem under the insulation layer

Method used

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  • A method for controlling corrosion under insulation layer
  • A method for controlling corrosion under insulation layer
  • A method for controlling corrosion under insulation layer

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Experimental program
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Effect test

Embodiment 1

[0071] Embodiment 1 Corrosion control method under thermal insulation layer

[0072] The corrosion control method under the thermal insulation layer in this embodiment includes the following steps:

[0073] 1) Preparation of coating: The thermal conductivity of the coating formed by the coating shall be less than or equal to 0.05 [W / (m.K)], the decontamination rate of the coating formed by the coating shall be greater than 95.0%, and the stain sensitivity rate shall be greater than 4.5%.

[0074] 2) Coating coating: coating the coating prepared in step 1) on the surface of pipes and equipment, forming a coating after the coating is dried, installing the thermal insulation layer on the surface of the coating, and using the existing thermal insulation layer as the thermal insulation layer. Glass wool, aerogel felt, etc.; in step 2), the coating is directly coated on the surfaces of pipes and equipment by means of scraping or mold fixing, the thickness of the single curing of the...

Embodiment 2

[0082] Embodiment 2 Containing cyclic phosphate ester phenolic derivative flame retardant and its preparation

[0083] The flame retardant containing cyclic phosphate ester phenolic derivatives in this embodiment is a phosphorus ring low molecular weight novolac resin derivative modified by phenyl dichloride phosphate as a phosphorus source, and its structural formula is as follows:

[0084]

[0085] where n is a positive integer greater than 0.

[0086] The preparation method of the cyclic phosphoric acid ester-containing phenolic derivative flame retardant comprises the following steps: taking 100 parts of low molecular weight linear p-tert-butyl phenolic resin, 120 parts of chlorobenzene and 35 parts of potassium hydroxide in a closed reaction kettle; Under the protection of ice bath and nitrogen, it was dispersed at a high speed for 10 minutes, and it was in a paste state; 70 parts of phenyl dichloride phosphate was added to 200 parts of chlorobenzene to be dispersed ev...

Embodiment 3

[0098] The flame retardant and thermal insulation coating suitable for the nuclear power irradiation environment in this embodiment includes a first component and a second component, and the mass ratio of the first component and the second component is 4:1.

[0099] Among them, the first component includes the following raw materials by weight: 100 parts of mixed phenolic resin, 8 parts of cyclic phosphate phenolic derivative flame retardant, 20 parts of resin toughening agent, 22 parts of reactive diluent, inorganic low thermal conductivity 100 parts of filler, 9 parts of surface treatment agent.

[0100] In the first component: the mixed phenolic resin includes 20 parts of phenolic resin and 80 parts of phenolic epoxy resin; the resin toughener is epoxy-terminated liquid nitrile rubber; the reactive diluent is 8 parts of benzyl glycidyl ether and 12 parts of neopentyl glycol diglycidyl ether; the inorganic thermally conductive filler in the first component includes the follo...

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Abstract

The invention provides a method for controlling corrosion under an insulation layer, comprising the following steps: 1) preparing a coating: the thermal conductivity of the coating formed by the coating needs to be less than or equal to 0.05 [W / (m.K)], and the coating formed The decontamination rate of the coating is greater than 95.0%, and the contamination sensitivity rate is greater than 4.5%; 2) Coating: apply the coating on the surface of the pipeline and equipment, and form a coating after the coating dries, and install the insulation layer on the coating on the surface; 3) installation of a corrosion monitoring device: the corrosion monitoring device includes a metal coupling electrode, a signal transmitter and an indicator; wherein, the metal coupling electrode is installed on the surface of the metal substrate, inside the coating, and for heat preservation during construction. In the layer; 4) Corrosion monitoring: the current signal of the metal coupling electrode is transmitted to the signal transmitter, and the signal transmitter receives the current signal and amplifies it, and drives the indicator for display. The corrosion control method under the thermal insulation layer of the present invention can provide an effective basis for the maintenance strategy under the thermal insulation layer, and achieve the purpose of controlling the corrosion of the metal base material.

Description

technical field [0001] The invention relates to the technical field of corrosion and protection of pipeline equipment in nuclear power plants, in particular to a method for controlling corrosion under a thermal insulation layer in a nuclear power plant environment. Background technique [0002] Corrosion under insulation (CUI) refers to a corrosion phenomenon that occurs on the outer surface of pipes or equipment to which insulation materials are applied. The thermal insulation material is usually a loose and porous structure with a large specific surface area, so it has a strong water absorption capacity. Due to design defects of insulation, mechanical damage, maintenance problems, etc., water vapor will gradually enter the insulation layer, and most insulation materials are inorganic, which contains a large amount of chloride, fluoride, sulfide, etc., which will promote metal corrosion. [0003] In the prior art, the methods for solving the problem of corrosion under the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L58/04F16L57/04F16L59/02C09D163/04C09D161/06C09D5/18C09D7/65C09D7/62G01N17/00
CPCF16L58/04F16L57/04F16L59/028C09D163/04C09D5/18C09D7/65C09D7/62C09D7/70G01N17/00C08K2003/2241C08L61/06C08K9/06C08K7/26C08K7/28C08K3/22C08K13/06
Inventor 梁耀升刘晓伟金哲
Owner SUZHOU NUCLEAR POWER RES INST