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Method for evaluating the diffusion and penetration performance of dissolved carbon dioxide in anti-corrosion coatings

A technology of anti-corrosion coating and diffusion performance, applied in measuring devices, instruments, scientific instruments, etc., can solve problems such as penetration performance of anti-corrosion coating outside pipelines

Active Publication Date: 2016-08-31
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing technology is not suitable for evaluating the dissolved CO in soil 2 For the problem of permeability in the anti-corrosion coating outside the pipeline, the embodiment of the present invention provides a method for evaluating the diffusion and permeability of dissolved carbon dioxide in the anti-corrosion coating, by calculating the CO 2 Diffusion coefficient and permeability coefficient in the external anti-corrosion coating of the pipeline, so as to evaluate its diffusion and permeability performance

Method used

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  • Method for evaluating the diffusion and penetration performance of dissolved carbon dioxide in anti-corrosion coatings
  • Method for evaluating the diffusion and penetration performance of dissolved carbon dioxide in anti-corrosion coatings
  • Method for evaluating the diffusion and penetration performance of dissolved carbon dioxide in anti-corrosion coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Evaluation of dissolved CO 2 The method of diffusing properties in the anti-corrosion coating is carried out as follows:

[0055] Step 1, test soil solution CO 2 Concentration c 1 : First test the pH value of the soil solution by a pH meter, then according to the CO 2 The ionization balance equation at constant temperature and pressure calculates the soil solution CO 2 Concentration c 1 .

[0056] Step 2, test the penetration solution CO under the coating 2 Concentration c 2 : dissolved CO in soil solution 2 and some other ingredients penetrate into the gap between the coating and the pipeline steel through the coating. First, test the pH of the penetrating solution under the coating with a pH meter every 1h until the pH of the solution is stable for a period of time and then stop the test. Then, according to the CO2 The ionization balance equation under constant temperature and pressure calculates the CO2 concentration c2 of the permeate solution under the coat...

Embodiment 2

[0066] Evaluation of dissolved CO 2 In the method of penetrating properties in anti-corrosion coatings, follow the steps below:

[0067] Step 1, test soil solution CO 2 Concentration c 1 : First test the pH value of the soil solution by a pH meter, then according to the CO 2 The ionization balance equation at constant temperature and pressure calculates the soil solution CO 2 Concentration c 1 .

[0068] Step 2, test the penetration solution CO under the coating 2 Concentration c 2 : dissolved CO in soil solution 2 and some other ingredients penetrate into the gap between the coating and the pipeline steel through the coating. First, test the pH of the penetrating solution under the coating with a pH meter every 1h until the pH of the solution is stable for a period of time before stopping the test, and then according to CO 2 The ionization balance equation at constant temperature and pressure is used to calculate the permeation solution CO under the coating 2 Concent...

example 1

[0086] Examples of the present invention provide a method for evaluating dissolved CO 2 Method of Diffusion and Permeation Properties in Medium Density Polyethylene Coatings (MDPE, Bredero Shaw).

[0087] Implementation conditions:

[0088] The thickness of the MDPE coating is 0.8mm, and the penetration area of ​​the coating is 0.002826m 2 , the test temperature is 25°C, and the test pressure is 1 atmosphere.

[0089] Implementation process and results:

[0090] Step one, first test the pH value of the soil solution, then according to the CO 2 The ionization balance equation at constant temperature and pressure calculates the soil solution CO 2 Concentration c 1 , during the whole infiltration process, it is considered that c 1 constant.

[0091] Step 2: Test the pH of the penetrating solution under the coating every 1 hour through the pH meter in the right room, stop the test until the pH of the solution is stable for a period of time, and obtain the change curve of pH...

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Abstract

The invention discloses a method for evaluating the diffusion and permeability of dissolved carbon dioxide in an anticorrosion coating, belonging to the field of pipeline anticorrosion coatings. The method is operated as follows: first test the pH of the soil solution and the pH of the infiltration solution under the coating, then calculate the soil solution CO 2 Concentration c 1 and the permeation solution CO under the coating 2 Concentration c 2 , and draw c 2 ~t graph and ln(c 1 -c 2 )~t curve, and finally calculate the dissolved CO 2 Diffusion and permeability coefficients in anticorrosion coatings. The invention realizes the quantitative evaluation of the diffusion and permeability of the dissolved carbon dioxide in the anticorrosion coating, provides a basis for the screening of the anticorrosion coating outside the pipeline, and also predicts and evaluates the service life and remaining time of the anticorrosion coating of the steel pipeline Lifespan is provided.

Description

technical field [0001] The invention relates to the field of pipeline anticorrosion coatings, in particular to a method for evaluating the diffusion and permeability of dissolved carbon dioxide in anticorrosion coatings. Background technique [0002] CO 2 When in contact with water in the soil, it will dissolve in water and ionize successively into bicarbonate and carbonate ions, that is, exist in the form of dissolution. The steel pipeline with anti-corrosion coating is in contact with the soil for a long time during the service process, and the dissolved CO in the soil 2 The bicarbonate and carbonate ions penetrate through the anti-corrosion coating and reach the surface of the steel pipe, which can easily lead to corrosion failure of the pipe. Therefore, to evaluate the dissolved CO in soil 2 Diffusion permeability in the anti-corrosion coating on the pipeline has very important guiding significance for evaluating and predicting the service life and remaining life of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00G01N13/04
Inventor 付安庆白真权李广山林冠发苗健蔡锐赵雪会
Owner BC P INC CHINA NAT PETROLEUM CORP