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Electrochemical experiment apparatus and test method for corrosion of samples with tensile stress loaded in high-temperature and high-pressure fluid environment

A technology of high temperature and high pressure, experimental equipment, applied in the direction of measuring equipment, weather resistance/light resistance/corrosion resistance, scientific instruments, etc., to achieve the effect of reliable experimental methods

Inactive Publication Date: 2016-06-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the electrochemical test of tensile stress-loaded samples is basically carried out on the stress ring, and the experimental conditions are carried out under normal pressure and static conditions, which are somewhat different from the actual environment.

Method used

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  • Electrochemical experiment apparatus and test method for corrosion of samples with tensile stress loaded in high-temperature and high-pressure fluid environment
  • Electrochemical experiment apparatus and test method for corrosion of samples with tensile stress loaded in high-temperature and high-pressure fluid environment
  • Electrochemical experiment apparatus and test method for corrosion of samples with tensile stress loaded in high-temperature and high-pressure fluid environment

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0069] Example 1 has the electrode potential test of loading tensile stress metal sample

[0070] According to the method described, the 60% yield strength (0.6σ s ) tensile stress, test the change of its electrode potential in 3.5% NaCl solution, CO 2 The partial pressure is 2MPa, the temperature is 80°C, and the flow velocity is 0.3m / s. Compare the results with those without stress. For specific results, see Image 6 . After loading a tensile stress of 60% yield strength, the electrode potential decreased and the surface activity increased.

example 2

[0071] Example 2 AC impedance test with or without loading tensile stress metal sample

[0072] According to the method described, the 60% yield strength (0.6σ s ) tensile stress, test its AC impedance in 3.5% NaCl solution, CO 2 The partial pressure is 2MPa, the temperature is 80°C, the flow velocity is 0.3m / s, and the time is 1 hour. Compare the results with those without stress. For specific results, see Figure 7 . After loading the tensile stress of 60% yield strength, the high-frequency capacitive reactance arc decreases, indicating that the transfer resistance decreases and the corrosion rate increases.

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Abstract

The invention discloses an electrochemical experiment apparatus and test method for corrosion with tensile stress loaded in high-temperature and high-pressure fluid environment. The apparatus comprises an autoclave, a branch pipe with circular flow and an electrochemical test system with tensile stress loaded; one side of the autoclave is connected to the branch pipe with circular flow, and the branch pipe with circular flow is provided with the electrochemical test system with tensile stress loaded. The apparatus and the test method can be used for researching corrosion behaviors of metal materials with the interaction of high temperature, high pressure, liquid phase fluid, loading of tensile stress, and other factors.

Description

technical field [0001] The present invention relates to a high-temperature and high-pressure fluid environment loaded tensile stress sample corrosion electrochemical experiment device and test method, more specifically, it relates to the electrochemical test of the corrosion process of metal materials in the high-temperature and high-pressure liquid fluid environment that is simulated when the tensile stress is loaded A device, and a method for using the device to perform in-situ electrochemical real-time online testing. Background technique [0002] In industries such as petroleum industry, chemical industry and electric power industry, the environmental conditions in many production links are very harsh, and metal equipment and parts are widely faced with high temperature and high pressure liquid phase fluid environment. In such environments, metals are subject to severe corrosion. In the corrosion process, there are not only the erosion of the corrosive medium, but also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 任呈强鲍明昱刘丽刘西成王书亮黄韵任健张智曾德智
Owner SOUTHWEST PETROLEUM UNIV
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