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Method for detecting corrosion resistance of metal plastic composite material

A technology of composite materials and metal-plastics, applied in the field of metal anti-corrosion, can solve the problems of reported and unseen corrosion resistance evaluation methods of steel-plastic composite pipes, and achieve the effect of perfecting the evaluation system

Inactive Publication Date: 2015-05-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The detection of steel-plastic composite pipes is limited to the detection of composite quality, but there is no report on the evaluation method of corrosion resistance of steel-plastic composite pipes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Injection molding method is used to wrap polypropylene on the outer surface of the steel rod to make a rod-type standard sample. Soak it in 30% by mass percentage of dilute sulfuric acid solution, keep it at 60°C for 240 hours at a constant temperature, measure the iron content in the solution to be 0.0318mg / L, and compare it with the iron content (0.0172mg / L) in the solution before soaking. content increased by only 0.0146mg / L, and the average annual corrosion rate was 5.650×10 -6 mm / a, indicating that polypropylene has a good barrier effect on dilute sulfuric acid.

Embodiment 2

[0022] Injection molding method is used to wrap polypropylene on the outer surface of the steel rod to make a rod-type standard sample. It was soaked in 15% sodium hydroxide solution by mass percentage, kept at 60°C for 240 hours at a constant temperature, and the iron content in the solution was measured to be 0.1027mg / L, and compared with the iron content (0.0820mg / L) in the solution before soaking, The iron content only increases by 0.0207mg / L, and the average annual corrosion rate is 7.941×10 -6 mm / a, indicating that polypropylene has a good barrier effect on sodium hydroxide.

Embodiment 3

[0024] Injection molding method is used to wrap polypropylene on the outer surface of the steel rod to make a rod-type standard sample. It was soaked in 25% sodium chloride solution by mass percentage, maintained at 60°C for 240 hours at a constant temperature, and the iron content in the solution was measured to be 0.0098mg / L, and compared with the iron content (0.0079mg / L) in the solution before soaking, The iron content only increases by 0.0016mg / L, and the average annual corrosion rate is 0.6105×10 -6 mm / a, indicating that polypropylene has a good barrier effect on sodium chloride.

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Abstract

The invention belongs to the field of metal corrosion protection, and discloses a method for detecting the corrosion resistance of metal plastic composite material. The metal plastic composite material is formed by covering the surface of a metal standard test piece with a high polymer material blocking layer. The method concretely comprises the following steps: contacting the metal plastic composite material with a solution with corrosiveness to metal by the high polymer material blocking layer, wherein the metal standard test piece is separated from the solution by the high polymer material blocking layer; analyzing the concentration of metal ions in the solution; evaluating the corrosion resistance of the metal plastic composite material according to the change of the concentration of the metal ions in the solution. In the prior art, the method for directly evaluating the corrosion resistance of the metal high polymer composite material is not available; the method is used for evaluating the barrier property of the blocking layer by measuring the change of the concentration of the metal ions in the solution before and after the metal standard test piece with the blocking layer is soaked into the solution, so that the corrosion resistance of metal high polymer composite material can be further evaluated, and the evaluation system of a steel-plastic composite pipe is perfected.

Description

technical field [0001] The invention belongs to the field of metal anticorrosion, and in particular relates to a method for detecting corrosion resistance of metal-plastic composite materials. Background technique [0002] In order to improve the service life of metal pipes, rods, plates, wires or other profiles (hereinafter referred to as metal materials), organic polymer materials (such as polyethylene, polypropylene, polytetrafluoroethylene, polyvinyl chloride, butyronitrile) are often used Rubber and other rubber and plastic materials) are attached to the inner or outer surface of the metal material (hereinafter referred to as the surface), separating the corrosive (such as acid, alkali, salt and oxidant solution) medium from the protected metal material, so as to To achieve the purpose of protecting metal materials. my country has formulated a series of industry standards and national standards for lining pipe fittings since the 1970s and 1980s, such as HG20538-92 "Lin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 游革新梅淑琴段兴璋刘畅曾敏戴卓杨浩梁乃夫
Owner SOUTH CHINA UNIV OF TECH
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