Metal hydrogen permeation behavior research device and method

Abstract

The invention discloses a metal hydrogen permeation behavior research device and method, the device includes a mechanical loading system, an electrochemical measurement system, a temperature control system and a gas drive system. The loading system provides tensile stress to a specimen by a jack via a middle transfer component. A hydrogen permeation electrolysis pool, a negative pole pool and a positive pole pool are made of nickel base alloy so as to improve the bearing capacity and corrosion resistance, a sealing component is adopted to realize strict sealing between the electrolytic pool and the specimen. An electrolyte solution and a high pressure gas are introduced into the negative pole pool, and a high-voltage reference electrode and an auxiliary electrode are arranged to simulate the mechanical chemical service environment of a metal structure. The metal hydrogen permeation behavior research device can be used for study on hydrogen permeation behavior of a metal structure in high hydrostatic pressure effect deep sea environment and downhole drilling device high pressure environment under the action of tensilc stress-strain effect, and the defect that in the prior art the hydrogen permeation cell can't measure the impact of stress state on metal hydrogen permeation behavior in high pressure environment can be compensated, and by introduction of the temperature control system and the gas drive system, the medium stability can be maintained, and the testing precision is increased.

Description

technical field [0001] The invention relates to a research device and method for hydrogen permeation of metal structures, in particular to a device and method for researching metal hydrogen permeation behavior under the action of tensile stress in a high-pressure environment. Background technique [0002] During the development of oil and gas resources, a large number of drilling and oil production devices work in a high-pressure environment, and are affected by working load and environmental stress at the same time. Cathodic overprotection, acidic oil and gas environment corrosion, high-pressure hydrogen-containing media, etc. will all lead to the generation, adsorption and penetration of atomic hydrogen into the steel, and eventually induce hydrogen embrittlement failure of the metal structure. Hydrogen embrittlement is essentially caused by the penetration of hydrogen into the metal. Studying the influence of various factors on hydrogen permeation behavior is an important...

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Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the present invention provides a device and method for studying metal hydrogen permeation behavior, which can study the hydrogen permeation behavior of metal structures under the action of tensile stress and strain in deep sea environments under high hydrostatic pressure and in high pressure environments of downhole drilling and production devices. Permeation behavior, making up for the deficiency that the existing hydrogen permeation electrolytic cell cannot measure the influence of the stress state on the metal hydrogen permeation behavior in a high-pressure environment

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