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

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...