Device for testing stress corrosion behavior of metal material under fluid high pressure

Abstract

The invention provides a device for testing the stress corrosion behavior of a metal material under fluid high pressure, belonging to the technical field of metal material test equipment. The device comprises a high-pressure kettle, an electrochemical workstation, a timer, a bundled wire, a stud, a loading nut, a loading device top plate, a closed threaded sleeve, a high-strength insulating spacer, a threaded sleeve, a loading device bottom plate, an auxiliary electrode, a reference electrode, a steel wire rope, a powerful instant adhesive, an insulating coating layer and a rectangular spring and is used for testing the stress corrosion behavior of the metal material under fluid high pressure. The loading way is a constant-load loading way which is implemented by a spring and the stress magnitude of which can be conveniently adjusted. The device can solve the problems of high requirement on stress conduction air tightness between the loading equipment and the high-pressure kettle in the prior art, inconvenience in adjusting the loading stress and electrochemical performance study in a stress corrosion test process of a high-pressure environment.

Description

technical field [0001] The invention relates to the technical field of metal material testing equipment, in particular to a device for testing the stress corrosion behavior of metal materials under fluid high pressure. Background technique [0002] As people continue to explore the depth of the ocean, the applicability of marine engineering materials in deep-sea corrosion environments is also facing a huge test. The deep-sea real-sea environmental corrosion test has the natural shortcomings of high difficulty, high investment, high failure risk, and long test period. Therefore, the current corrosion experiments of materials under deep-sea conditions are mainly based on laboratory simulation environments, and the simulated environments mainly include high pressure, low temperature, low dissolved oxygen, and different solution components. Among them, the simulation of the high-pressure environment mainly relies on various types of autoclaves. Due to the limitations of the sel...

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Problems solved by technology

[0007] The Chinese patent "A Portable Axial Tensile Stress Loading Device" (CN 203224399 U) discloses a portable axial tensile stress loading device, which adopts a rectangular load-bearing frame and elastically deforms the load-bearing frame by rotating the loading nut Thus, the axial tensile stress is applied to the sample. Although the structure of the device is simple and compact, because the stress comes from the elastic deformation of the load-bearing frame, there is a certain elastic limit, so the required applied stress cannot be greatly adjusted, and the frame exists Problems requiring recalibration

[0008] The Chinese patent "A high-temperature, high-pressure constant-load stress corrosion test method and device" (CN 102706750 A) discloses a method and device for constant-load stress corrosion tests under high-temperature and high-pressure environments. The sample is fixed in the load-bearing frame with a clamp. Although the structure of the device is simple and compact, it can be placed in a high-temperature and high-pressure environment as a whole, but the loading of the sample still requires the use of a tensile testing machine. Moreover, the problem with the load-bearing frame is that , the high-temperature creep of the frame material itself will cause local stress relaxation, and stress relaxation will also occur when the sample forms cracks, so it is not a strict constant load test condition, which will affect the experimental results

However, in a high-pressure environment, it is necessary to overcome problems such as the effective volume of the autoclave, the sealing of stress conduction, the reliability of the stress loading method of the sample, and how to apply electrochemical signals.

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