Test apparatus for research on laws of influence of sulfate reducing bacteria on stress corrosion cracking of metal

Abstract

The invention discloses a test apparatus for research on laws of influence of sulfate reducing bacteria on stress corrosion cracking of metal. The integral test apparatus comprises a stress corrosion test machine, an electrochemical workstation, a nitrogen cylinder, a constant-temperature water bath and a control system. The stress corrosion test machine comprises a power device, a transmission gear, a test specimen fixture, a solution box and a test specimen surface detector, and interfaces can be provided for other devices by the stress corrosion test machine. Oxygen can be removed by nitrogen in stress corrosion test procedures, so that anaerobic environments can be provided for the sulfate reducing bacteria. Bent test specimens can further deform by the aid of the power device and the transmission gear, so that specific stress can be applied. Stress corrosion can occur on the bent test specimens under the joint effects of the external stress and sulfate reducing bacterial corrosion solution. Corrosion signals can be monitored by the aid of the electrochemical workstation in real time, and nucleation and propagation conditions of surface crack can be periodically observed by the aid of the test specimen surface detector. The test apparatus has the advantages that test conditions can be precisely controlled, the test apparatus is high in automation degree, and conditions can be provided for research on the influence of the sulfate reducing bacteria on the stress corrosion cracking of the metal.

Description

technical field [0001] The invention relates to a metal stress corrosion test device, in particular to a test device capable of studying the influence of life activities of sulfate-reducing bacteria on stress corrosion cracking of metals and the law of action. Background technique [0002] Stress corrosion cracking of metals and their alloys under the combined action of stress and corrosive environment is a very dangerous form of material failure. The growth rate of stress corrosion cracks is several orders of magnitude higher than that of other forms of corrosion, and metal components often break without any warning, causing huge safety hazards. Therefore, it is of great significance to study the law and mechanism of stress corrosion cracking in metals. Sulfate-reducing bacteria are very common bacteria in the daily environment, which can reduce sulfate to sulfur ions. A large number of existing studies have shown that it can accelerate metal pitting corrosion. However, th...

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Problems solved by technology

[0004] The problem to be solved by the present invention is to overcome the defect that the prior art does not have a test device that can be used to study the influence law and mechanism of stress corrosion cracking of metal bending specimens in the environment of sulfate reducing bacteria, and provides a method that ensures anaerobic and constant temperature environment. , and a device that can perform corrosion electrochemical tests and sample surface observation

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