Multiphase flow erosion local corrosion testing apparatus

Abstract

The invention relates to a multiphase flow erosion local corrosion testing apparatus. The testing apparatus comprises an ore pulp pump, a slurry tank, a stirrer, a pressure gage, an electromagnetic flowmeter, a pipe flow erosion pipe section, a jet flow erosion pipe section, a thermocouple and a low temperature constant temperature circulator. The testing apparatus is characterized in that the stirrer is arranged above the slurry tank, the thermocouple is mounted in the slurry tank and is connected with the low temperature constant temperature circulator, the bottom end of the slurry tank is connected with the ore pulp pump through a feed pipe, a ball valve is installed on the feed pipe, an outlet pipe of the ore pulp pump is provided with a first stop valve and is divided into two paths through the stop valve, one path returns to the slurry tank after passing through a second stop valve, and the other path returns to the slurry tank after passing through the pressure gage, the electromagnetic flowmeter, the pipe flow erosion pipe section and the jet flow erosion pipe section. According to the invention, characteristics of pipe flow and jet flow erosion-corrosion testing machines are combined, pipe flow erosion and jet flow erosion local corrosion tests can be simultaneously or individually carried out, and the testing apparatus has the characteristics of a small size, a simple structure, low manufacturing cost and good operationality.

Description

Technical field [0001] The invention belongs to the technical field of erosion corrosion research, and specifically relates to a multiphase flow erosion local corrosion test device. Background technique [0002] Erosion corrosion is the phenomenon of metal damage caused by high-speed relative movement between the metal surface and the corrosive fluid. It is the result of the synergistic effect of erosion and corrosion on the material, and it is a kind of local corrosion that is more harmful. Erosion corrosion is widespread in various industrial processes. Equipment exposed to moving fluids, such as pipelines, pipe fittings, and pump flow parts, will be damaged by erosion corrosion to varying degrees, especially in two-phase solid-phase particles. In flow or multiphase flow, the damage is more serious. Multiphase flow erosion and corrosion is a very complicated process, which is affected by many factors such as fluid mechanics factors, material factors, solid phase particles in t...

AI Technical Summary

Problems solved by technology

Erosion corrosion is a kind of local corrosion, and the electrochemical characteristics of metal materials are unevenly distributed locally. The current testing machine and the electrochemical testing methods used such as dynamic potential scanning method, linear polarization, electrochemical AC impedance spectroscopy, etc. Both can only obtain the electrochemical information of the entire sample surface, and the data given are statistical averages, and cannot distinguish the electrochemical signals of the local area of ​​the erosion corrosion sample, which shows certain limitations in the study of erosion local corrosion.

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