Multifunctional base injection type cavitation corrosion test device

Abstract

The invention belongs to a multifunctional submerged jet type cavitation test device in the fields of cavitation erosion resistance and erosion corrosion resistance of metal materials, a detachable upper end cover arranged closely is provided on top of a tank, a pressure valve and a pressure release valve are arranged on a side wall of the sealed tank, a nozzle is detachably arranged on an inner end of the tank of the same tube of the pressure valve, a testing bracket and a testing sample wafer are arranged on the other side wall of the sealed tank, a plug screw and a traverse education through hole for testing thereon are arranged at a lower part of the same side wall of the sealed tank and the pressure valve, the traverse and the education through hole are sealed through sealant; a pressure gauge is arranged on an upper part of the sealable tank matching with the pressure release valve; the plug screw and the sealed tank are sealed through a seal ring. The device is reliable in structure theory, low in manufacturing cost, handy in working use, precise in experiment effect, long in service life and reduced in energy consumption.

Description

Technical field: [0001] The invention belongs to a test device in the field of cavitation corrosion resistance and erosion corrosion resistance of metal materials, and specifically relates to a multi-functional test device with cavitation intensity measurement and electrochemical measurement, which can simulate the erosion and cavitation performance of materials under different pressure environments. Functional underwater jet cavitation test device. Background technique: [0002] In the marine environment, metal components are often in contact with flowing seawater, and sometimes the relative flow velocity is very high, such as condensers of ships and coastal power stations, propellers and rudder plates of ships, etc., which may cause erosion corrosion or cavitation Corrosion, in this case, the corrosion behavior of metals in static sea water is obviously different, so corresponding test equipment is required to simulate dynamic water corrosion, and to evaluate the corrosion...

AI Technical Summary

Problems solved by technology

At present, the test devices that can be used for erosion or cavitation corrosion mainly include three types: rotation, tube flow and magnetostriction. The advantages, disadvantages and application scopes of the three are different; The rotating cylinder is simple and convenient to operate, and can simulate the corrosion condition of the propeller very well. However, it is prone to violent vibration when rotating at high speed, so it is impossible to carry out the test at a higher flow rate, and the electrochemical signal is inconvenient to export, so the electrochemical test system cannot be loaded. In addition, due to the centrifugal force during rotation, the flow characteristics of the fluid are not easy to control, but this device is currently widely used in China. Many units such as the Shenyang Metal Institute of the Chinese Academy of Sciences have such equipment; the pipe flow simulation experimental device can simulate the flow of the pipeline very well. Under actual working conditions, it is easy to control the flow characteristics of the fluid, but the amount of solution required is large, the operation is complicated, and the cost is high; the advantage of the magnetostrictive test device is that the test method is simple and feasible, and the test piece itself does not bear vibration and corresponding stress. Quantitative measurement of the degree of cavitation and the use of test liquids that are incompatible with the chemical activity of the test piece material are not suitable. Many units such as the 725th Institute of China Shipbuilding Industry Corporation and the Institute of Corrosion of the Chinese Academy of Sciences have such equipment or their improved types.

At the end of the 20th century, the British Nonferrous Metals Research Association proposed the jet impact test method, that is, the high-speed liquid flow is vertically sprayed on the surface of the sample. The sample is fixed during the impact, so it is convenient for electrochemical testing. After the method was proposed, the University of Nottingham has carried out applied research, but there is no mature test device yet.

At present, the existing related equipment at home and abroad can not fully meet the above requirements.

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