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A method for detecting corrosion resistance of metal-plastic composite materials

A composite material and metal-plastic technology, applied in the field of metal anti-corrosion, can solve the problems of reports, no corrosion-resistant evaluation methods of steel-plastic composite pipes, etc., and achieve the effect of improving the evaluation system

Inactive Publication Date: 2018-01-05
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 anti-corrosion and discloses a method for detecting the corrosion resistance of metal-plastic composite materials. The metal-plastic composite material is covered with a polymer material barrier layer on the surface of the metal standard test piece, and the specific steps include the following steps: the metal-plastic composite material is contacted with a solution corrosive to metal through the polymer material barrier layer, and the The molecular material barrier layer separates the metal standard test piece from the solution, analyzes the concentration of metal ions in the solution, and evaluates the corrosion resistance of the metal-plastic composite material according to the change of the concentration of the metal ions in the solution. The prior art does not directly evaluate the corrosion resistance of metal-polymer composite materials; the present invention evaluates the barrier of the barrier layer by measuring the change of the metal ion concentration in the solution before and after soaking the metal standard sample specimen with the barrier layer in the solution. Performance, and then evaluate the corrosion resistance of metal-polymer composite materials, and improve the evaluation system of steel-plastic composite pipes.

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 Patents(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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