Corrosion fatigue test apparatus in wet hydrogen sulfide environment, and test method thereof

Abstract

The invention discloses a corrosion fatigue test apparatus in wet hydrogen sulfide environment, and a test method thereof. The apparatus comprises a fatigue test machine, and also comprises a closed corrosion environment box arranged in the working section of the fatigue test machine and having a corrugated expansion joint, a circulating water system arranged outside the closed corrosion environment box and used for heating a corrosion medium in the closed corrosion environment box, and an online liquid sampling device connected with the closed corrosion environment box and used for measuring and regulating the concentration of the corrosion medium in real time; and a sample in the closed corrosion environment box is clamped by a clamp adapting to the sample, and the clamp traverses through the upper cover board and the lower baseboard of the closed corrosion environment box, and is connected with the fatigue test machine. The apparatus has a simple structure and a good sealing performance, and can be used for carrying out corrosion fatigue performance test of fatigue samples with different shapes and dimensions in the wet hydrogen sulfide environment; and the test method of the apparatus has a temperature control function, can be used for online measurement of the concentration of hydrogen sulfide in a corrosion solution, and improves the accuracy of a test result.

Description

technical field [0001] The invention belongs to the field of environmental corrosion cracking in toxic corrosive atmospheres such as wet hydrogen sulfide, and in particular relates to a corrosion fatigue test device and a test method thereof in a wet hydrogen sulfide environment. Background technique [0002] Premature failure of actual engineering components still occurs occasionally when they meet the fatigue design specifications. Studies have shown that engineering components are generally used in a certain corrosive environment. The corrosive environment will cause damage to the material, accelerate the initiation and expansion of fatigue cracks, and cause equipment damage. premature failure. Most of the existing fatigue design criteria are combined with empirical safety factors under simple force conditions, which are somewhat different from the actual service conditions of engineering components. Therefore, it is of great theoretical significance and engineering valu...

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Problems solved by technology

The experimental device includes a corrosion solution storage and circulation container, a solution circulation system, an environmental corrosion cracking test sample chamber, and an electrochemical auxiliary device, but the device cannot perform fatigue tests in a gas-containing medium; due to the large corrosion of equipment in a wet hydrogen sulfide environment, Hydrogen sulfide is highly toxic, and it is difficult to control the concentration during operation, and the test device under the conventional wet hydrogen sulfide environment does not consider the dynamic sealing structure required for the displacement of the sample caused by the alternating load during the fatigue test. The adaptability of the corrosion fatigue test in the environment needs to be improved

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