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Prediction method of expected service life of metal pipeline composite anticorrosion coating

A metal pipeline and anti-corrosion coating technology, which is applied in the field of prediction of the service life of pipeline composite anti-corrosion coatings, can solve the problems of long test time, difficulty, and heavy workload, and achieve short test time, simple formula, and small workload Effect

Active Publication Date: 2018-11-02
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since there are many factors affecting soil corrosion, and the types of outer wall coatings of ductile iron pipes are also very rich, and the types of outer coatings are still increasing with research and development, the expected use of outer coatings of ductile iron pipes in specific soil environments The calculation of life expectancy relies on complex formulas, and there are problems such as difficult theoretical derivation, long experiment time, heavy workload, and difficulty in establishing theoretical formulas and empirical formulas, which are extremely difficult

Method used

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  • Prediction method of expected service life of metal pipeline composite anticorrosion coating
  • Prediction method of expected service life of metal pipeline composite anticorrosion coating
  • Prediction method of expected service life of metal pipeline composite anticorrosion coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Corrosion test data of ductile iron pipe zinc+a organic coating samples in coastal saline soil are shown in the following table:

[0035]

[0036] Substituting the corrosion data of the zinc+a organic coating sample of the above-mentioned coastal saline soil ductile iron pipe into the calculation software for curve fitting, the fitting curve is obtained as follows figure 1 as shown,

[0037] The fitting curve equation is Y=0.16951+1.41706X+0.19264X 2

[0038] Fitting situation: correlation coefficient R-Square (COD) = 0.9975P = 0.003

[0039] When Y=100, X=19.4 years, that is, the expected service life of the ductile iron pipe zinc+a organic coating sample in the coastal saline soil environment is about 20 years.

Embodiment 2

[0041] Corrosion test data of ductile iron pipe zinc + b organic coating samples in coastal saline soil are shown in the following table:

[0042]

[0043] The fitting curve equation is Y=0.08426+2.65599X+0.05754X 2

[0044] Fitting situation: correlation coefficient R-Square (COD) = 0.99966P = 0.018

[0045] When Y=100, X=24.6 years, that is, the expected service life of the ductile iron pipe zinc+b organic coating sample in the coastal saline soil environment is about 25 years.

[0046] Using the above method, the expected service life of the composite coating in each typical soil area is calculated and evaluated, and the calculated and evaluated value of the service life of each coating in the corresponding corrosive environment is obtained, as shown in the following table:

[0047]

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Abstract

The invention discloses a method for predicting the expected service life of a metal pipe composite anti-corrosion coating. An experiment place is selected first, then a sample is buried in the experiment place, the sample is dug out according to a predetermined digging age limit, and the proportion S1 of red corrosion areas on the surface of the sample in the total surface area and the proportion S1 of exposed zinc layer areas obtained after organic coatings of the surface of the sample peel off in the total surface area are counted; the depth of corrosion pits in the surface of the sample is measured; finally, the corrosion age limit serves as the transverse coordinate, the equivalent corrosion area of the composite coating is S, S is equal to S1 plus 0.5S2, S serves as the vertical coordinate, an equation for fitting the corrosion area of the coating is calculated, and the expected service life of the detected sample is determined. The expected service life of the metal pipeline coating can be predicted by means of an experiment result in a short period of time, consumed time is short, the method takes effect quickly, requirements of actual application are met, and application and popularization are worthy.

Description

technical field [0001] The invention relates to a method for predicting the service life of a composite anticorrosion coating for pipelines, in particular to a method for predicting the expected service life of a composite anticorrosion coating for ductile iron pipes. Background technique [0002] As the service life of buried earth graphite cast iron pipelines increases, the outer wall coating and pipe wall will corrode. Slight corrosion has no effect on the use of the pipeline, but severe corrosion will have a greater impact on the pipeline, which will cause the pipeline to perforate or even rupture, resulting in Pipeline failure; at the same time, users need to select the grade of ductile iron pipe and the type of outer coating that meet the expected life expectancy according to the specific soil corrosion environment. Therefore, to study the corrosion resistance of ductile iron pipes and various coatings under different soil conditions, It is particularly important to ev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
CPCG01N17/00
Inventor 李军信绍广王恩清申勇车蕾
Owner XINXING DUCTILE IRON PIPES CO LTD