Device and method for researching hydrogen permeation behavior of metal subjected to dead-load pulling stress in gaseous medium

Abstract

The invention relates to a device and method for researching the metallic hydrogen permeation behavior, in particular to a device and method for researching the hydrogen permeation behavior of metal subjected to dead-load pulling stress in a gaseous medium, and the device and method are used for researching the interactive influence of pulling stress and a gaseous environment on the metallic hydrogen permeation behavior. The device comprises a heating device, a stretching device, an electrolytic bath and a liquid / gas storage bottle. The method comprises the steps of: nickel-plating a single side of a test piece to be tested, and fixing the test piece between a lower opening of an anode pool and an upper opening of an environmental pool, wherein the nickel-plated layer of the test piece faces the environmental pool; and providing dead-load pulling stress for the test piece by the stretching device. An experimental medium in the anode pool is a NaOH solution. An experimental solution in the environmental pool forms a gaseous medium environment under the action of water bath. The device and method provided by the invention can be used for researching the hydrogen permeation behavior of a metallic material subjected to dead-load pulling stress in the gaseous medium, the control of the magnitude of the pulling stress and the environment and atmosphere can be realized, and the deficiency that the influence of a stressed state and the gaseous environment on the metallic hydrogen permeation behavior cannot be measured through the traditional electrolytic bath is made up.

Description

Technical field [0001] The invention relates to a device and a method for studying hydrogen permeation behavior of metals, in particular to a device and method for studying hydrogen permeation behavior of metals in a gaseous medium under static tensile stress conditions. Background technique [0002] Hydrogen embrittlement stress corrosion cracking behavior is a factor that seriously affects the safety of materials when metals are served in the atmosphere. The internal hydrogen absorbed by metal materials in the process of heat treatment, pickling, electroplating and welding, and the acid gas in the atmosphere such as H 2 S, SO 2 Or CO 2 The external hydrogen that penetrates into the metal matrix under such contact or under cathodic protection conditions will cause the toughness of sensitive metal materials to decrease and the degradation of physical or chemical properties, affecting their service safety. Especially when metal materials are under tensile stress, hydrogen is more ...

AI Technical Summary

Problems solved by technology

[0004] At present, the hydrogen permeation test of metals is mainly based on the principle of the Devanathan-Stachurski double-sided electrolytic cell, and the existing double electrolytic cells mostly use liquid hydrogen permeation devices with solutions on both sides, which makes it difficult to measure the hydrogen permeation current under gaseous conditions.

In addition, there is no reasonable device and method for evaluating the influence of static load tensile stress on the permeation behavior of gaseous hydrogen.

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