Corrosion test device for simulating environment alternation

Abstract

The invention belongs to the field of corrosion technologies, and relates to a corrosion test device for simulating environment alternation; small holes are respectively formed in the top of an upper barrel of an electrolytic tank and in the middle of the bottom of a lower barrel of the electrolytic tank in a digging manner; a tensile sample passes through the small holes and is sealed by a sealing rubber ring; a reference electrode is arranged in a salt bridge; a water outlet is formed in the other side of the upper barrel of the electrolytic tank, and a water inlet is formed in one side of the lower barrel of the electrolytic tank; a cold water pipe is arranged at the upper part in a corrosive solution tank; a hot water pipe is arranged at the lower part in the corrosive solution tank; the corrosive solution tank is respectively connected with the lower barrel and the upper barrel of the electrolytic tank; an air inlet is formed in the water inlet of the lower barrel of the electrolytic tank, and is connected with an air blower; a temperature control device is formed by connecting a condensing device, a heating device, a temperature sensor, an electronic temperature induction switch and a temperature controller; and a data acquisition device is arranged in the temperature controller. The corrosion test device is simple in main body structure, reliable in principle, low in preparation cost, good in test effect, easy in control of environmental parameters and environment-friendly.

Description

Technical field: [0001] The invention belongs to the technical field of corrosion, and relates to a corrosion device for controlling the alternating environment of metal materials during the loading process, which can be used alone to control the corrosion environment parameters of samples in corrosion simulation tests, in particular to a simulated environment Alternating Corrosion Test Apparatus. Background technique: [0002] With the rapid development of deep-sea engineering technology, the corrosion behavior of materials in the deep-sea environment has become a matter of great concern to researchers in materials and corrosion. Larger changes, deep sea engineering equipment such as Jiaolong deep submersible and underwater robots will go through the process from deep sea to shallow sea, and shallow sea to deep sea during operation. This alternation of deep and shallow seawater environmental factors will affect the corrosion of materials and structural parts. Behavior chan...

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Problems solved by technology

As early as the last century, foreign researchers have proposed a corrosion test device that is used in conjunction with a fatigue machine and a tensile machine. This device can control the temperature of the corrosive medium, dissolved oxygen content, pH value, pressure and polarization potential of the sample. , but the control of environmental changes cannot be realized; there are also related inventions in China, such as the invention patent with the application number 200810146899.2 "A device for realizing temperature and humidity control in the process of corrosion fatigue", which uses the circulation of the medium to realize the constant corrosion of the metal material The temperature and medium concentration can realize corrosion fatigue and stress corrosion tests in different corrosive atmospheres; the invention patent of application number 200810012951.5 "equipment and application for realizing synchronous dry-wet alternating accelerated corrosion during loading" discloses the stress test It is a performance evaluation equipment that alternates between wet and dry, and is in a certain humidity and temperature environment; but the devices mentioned in the above two patents are not suitable for stress corrosion and corrosion fatigue tests in aqueous solution; the invention patent with application number 200810049624.7 " A seawater circulation system for corrosion fatigue tests on metal materials" realizes low-cycle corrosion fatigue tests in circulating seawater and solves the circulation problem of water media in corrosion fatigue tests, but it is limited to cantilever bending samples and cannot Control seawater environmental factors; invention patents "A device for testing the fatigue crack growth rate in a corrosive environment" (200810167021.7) and "An electrolytic cell device for electrochemical in-situ measurement" (200810249619.0) respectively achieved C(T) and three Crack growth test of point bending specimens in water medium, but the control of environmental parameters is not mentioned; the invention patent "a control device for simulating marine environment for corrosion fatigue test" (200910012789.1) can realize the material in the simulated flowing seawater area Corrosion fatigue test in the environment of , tidal range area, and spray splash area. This patent adopts an artificial seawater circulation system with constant salinity, pH value, temperature and other factors, which cannot realize the adjustment of environmental factors; the invention patent "a kind of Process multi-parameter controllable electrolytic cell device" (201110358029.3) can control the temperature of the corrosion solution, dissolved oxygen content, pH value and the polarization potential of the sample, but cannot control the alternation of deep and shallow sea environments

To sum up, in the process of corrosion fatigue and stress corrosion, there is currently no simulation device that can realize the alternating conditions of deep and shallow sea environments in the process of corrosion fatigue and stress corrosion of materials and components, and evaluate the alternating deep and shallow sea environments of metal materials and components. Corrosion fatigue and stress corrosion performance of the process, so it is very important to provide a corrosion test device that simulates the alternating conditions of deep and shallow sea environments

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