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Deep-sea stress corrosion and seepage hydrogen experimental simulation device

A stress corrosion and experimental simulation technology, applied in the field of measuring instruments, to achieve the effect of reasonable design, reliable and credible data, and true and accurate stress

Inactive Publication Date: 2013-09-11
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been some progress and achievements in the experimental equipment for simulating deep-sea environment corrosion at home and abroad, but there is no report of such research equipment that can complete the stress corrosion test in deep-sea environment. Most of the technical difficulties are limited to the afterburner and pressure vessel. coordination problem

Method used

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  • Deep-sea stress corrosion and seepage hydrogen experimental simulation device
  • Deep-sea stress corrosion and seepage hydrogen experimental simulation device
  • Deep-sea stress corrosion and seepage hydrogen experimental simulation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Carry out potentiodynamic polarization curve and AC impedance spectrum test

[0024] 1. Material to be tested: 10CrSiNiCu low-alloy high-strength steel, the size of the sample is designed with reference to GB / T228-2002 rectangular cross-section proportional sample P3 type. Use water abrasive paper to grind the sample to No. 2000, use acetone, deionized water to clean, and dry it with hot air;

[0025] 2. Test solution: 3.5% NaCl solution with pH=2.00 as corrosion medium, and add boric acid (50g / L) as buffer solution;

[0026] 3. Stress calibration: The size of the stress is measured by the YC-III stress measuring instrument, and the stress calibration results are as follows image 3 shown. The three calibration lines shown in the figure are the corresponding stress values ​​when the hexagonal bolt is rotated by one-sixth, two-sixths, and three-sixths. It can be seen from multiple tests that the stress values ​​corresponding to the three stressing operation...

Embodiment 2

[0031] Example 2: Double electrolytic cell hydrogen permeation experiment

[0032] 1. Material to be tested: 10CrSiNiCu low-alloy high-strength steel, the sample design is based on GB / T228-2002 rectangular cross-section proportional sample P3 type. Use water-grinding sandpaper to grind both sides of the sample to No. 2000, and polish one side. The polished surface is electroplated with nickel, and the hydrogen is removed in a drying box at 200°C for three hours;

[0033] 2. The experimental solution and stress calibration steps in the corrosion chamber are the same as in Example 1, and 0.2mol / L NaOH solution is used in the oxidation chamber;

[0034] 4. Experimental steps: use the samples prepared in step 1 figure 1The device is fixed, the electroplating surface of the sample faces the oxidation chamber, and the hydrogen-charging surface faces the corrosion chamber. use figure 2 The device is stressed and the NaOH solution from step 2 is injected into the oxidation chamber...

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Abstract

The invention provides a deep-sea stress corrosion and seepage hydrogen experimental simulation device which comprises an oxidizing chamber and a corrosion chamber, as well as a stress application device, wherein testing ports are formed in one sides of the oxidizing chamber and the corrosion chamber; a fastening device is arranged at the testing ports; a testing sample is positioned between the testing ports of the oxidizing chamber and the corrosion chamber; the oxidizing chamber is connected with the corrosion chamber through the fastening device; the stress application device comprises two stress application steel plates and two stress application screw rods; one end of each stress application screw rod is fixed with one stress application steel plate; the other end of each stress application screw rod penetrates through the other stress application steel plate, and a rotating nut is arranged on the inner side of the stress application steel plate; two ends of the testing sample respectively penetrate through the two stress application steel plates; barrier plates are arranged between two ends of the testing sample and the stress application steel plates. The device can be used for testing the influence of the simulated external tensile stress in a deep sea environment on the material stress corrosion behavior.

Description

technical field [0001] The invention relates to a measuring instrument, in particular to a monitoring device for the stress corrosion-hydrogen permeation behavior of materials in a laboratory simulated deep sea environment. Background technique [0002] There are more and more reports of equipment stress corrosion cracking in the fields of petroleum, chemical industry, nuclear power, marine and other fields, and the occurrence of stress corrosion in equipment is often a sudden brittle fracture without obvious macroscopic plastic deformation. Concealed and difficult to find, the accident and disaster caused are sudden, so how to monitor and prevent stress corrosion of equipment becomes more and more important. There are abundant mineral resources in the ocean, and the exploration and exploitation of these resources requires the manufacture and use of new instruments and equipment. With the development and utilization of deep-sea resources, the corrosion of materials and comp...

Claims

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Application Information

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IPC IPC(8): G01N17/02
Inventor 孟国哲张博玄晓阳邵亚薇张涛王艳秋刘斌
Owner HARBIN ENG UNIV
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