A device and method for evaluating the corrosion resistance of metal composite pipes

Abstract

The present invention discloses an apparatus and a method for evaluating corrosion resistance of a metal composite pipe. The apparatus comprises a main body outer sleeve and connection members on both ends of the main body outer sleeve, wherein the internal space of the main body outer sleeve is used for placing a metal composite pipe to be evaluated, the connection members are used for communicating with a pipe of natural gas or other corrosion mediums, the metal composite pipe is formed by compounding more than or equal to two layers of metal pipes, and a welding seam exists or does not exist in the length direction of the metal composite pipe. With the apparatus of the present invention, the metal composite pipe can be connected to the natural pipeline or other corrosion medium pipelines to make the whole metal composite pipe in the corrosion medium, and the corrosion resistance of the metal composite pipe in the actual corrosion environment can be tested, such that the corrosion resistance of the metal composite pipe and the welding same can be truly and accurately reflected, and the reliable and valid data is provided for the project site.

Description

technical field [0001] The invention relates to a device and method for evaluating the corrosion resistance performance of metal composite pipes. Background technique [0002] Metal composite pipe is a new type of composite pipe in which metal pipes with different properties are embedded together. The metal composite pipe retains the advantages of different materials and makes up for the shortcomings of a single material. At present, metal composite pipes are generally used to replace corrosion-resistant alloy pipes at home and abroad. For composite pipelines for ground gathering and transportation, metal composite pipes need to be connected together by welding. Welds are often the weakest link in corrosive environments. For example, natural gas usually contains corrosive components such as hydrogen sulfide and carbon dioxide, and metal composite pipes, especially their welds, are easily corroded in such an environment. Once corrosion occurs, it will cause natural gas le...

AI Technical Summary

Problems solved by technology

However, the sample can only basically represent the corrosion resistance of the entire composite pipe, and cannot fully represent the corrosion resistance of the entire composite pipe section.

Moreover, after the composite pipe is formed, there is residual bonding force between the inner and outer layers, so the weld sample cannot fully reflect the mechanical state of the inner layer, and cannot reflect the corrosion resistance of the composite pipe in a consistent state.

In addition, it is very difficult to obtain standard specimens for common specifications of composite pipe welds

[0004] Therefore, the main problem existing in the prior art is: the performance of the sample tested in the testing method of the prior art can only basically represent the corrosion resistance of the entire composite pipe, and cannot fully represent the corrosion resistance of the entire composite pipe section

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