Metal microorganism corrosion electrochemical testing device under flowing system
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A technology of microbial corrosion and testing equipment, which is applied in the direction of measuring equipment, weather resistance/light resistance/corrosion resistance, scientific instruments, etc., can solve the problems of unable to gather and grow metal materials, etc., so as to facilitate sampling and detection, reduce disturbance, and facilitate repetition The effect of corrosion monitoring experiment
Pending Publication Date: 2018-02-23
TIANJIN UNIV
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Problems solved by technology
Solve the problems in the prior art that microorganisms cannot gather and grow on the metal surface in a short period of time and the real-time electrochemical corrosion measurement of metal materials under the flow system cannot be carried out; in addition, the working electrode of the device can directly use the metal material test piece under study. The steps and costs of making a dedicated working electrode are eliminated, which enhances the practicability of the device
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Embodiment 1
[0045] This example studies the corrosion mechanism of reclaimed water pipelines under the coupled action of disinfectants and microorganisms. After the raw water was sterilized at high temperature, 10 mL of sulfate-reducing bacteria liquid (about 5×10 9 ), respectively adding 0mg / L, 3mg / L, 6mg / L and 9mg / L sodium hypochlorite for corrosion experiment, each experiment period is 15 days. During the test, input the basic parameters such as nodular cast iron metal material characteristics and experimental conditions in the electrochemical workstation; after the open circuit potential is stable, select the measurement method as polarization curve measurement, select the reference electrode as the saturated Ag / AgCl reference electrode, and set The potential interval is 0.5mV, the initial potential is -0.1V relative to the open circuit potential, the end potential is 0.1V relative to the open circuit potential, and the scanning speed is 0.5mV / s. The results of the potentiodynamic sc...
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Abstract
The invention belongs to the field of metal electrochemical corrosion testing, in order to solve the problems in the prior art that microorganisms cannot be aggregated and grown on the metal surface in a short period of time and the real-time electrochemical corrosion measurement of metal materials under the flow system cannot be carried out, and at the same time, the production of special working electrodes is omitted. Steps and cost, enhanced practicability, the present invention, the electrochemical test device of metal microbial corrosion under the flowing system, comprises cylindrical glass cavity, upper end polytetrafluoroethylene sealing cover, lower end polytetrafluoroethylene sealing cover, reference electrode, Salt bridge, auxiliary electrode, platinum sheet, dosing hole, sampling hole, working electrode, working electrode contact hole, working electrode contact, copper disc, screw, water inlet, water outlet, the cylindrical glass cavity is the main body of the device, and the hollow The upper and lower ends of the cavity are sealed with polytetrafluoroethylene. The upper end is equipped with a reference electrode, auxiliary electrode, dosing hole and sampling hole, and the lower end is equipped with a working electrode. The invention is mainly applied to metal electrochemical corrosion test occasions.
Description
technical field [0001] The invention belongs to the field of metal electrochemical corrosion testing and can be used for real-time electrochemical monitoring of the metal microbial corrosion process in a fluid system. Specifically, it relates to an electrochemical test device for metal microbial corrosion in a fluid system. Background technique [0002] At present, more than 90% of the water supply pipelines in service in my country are metal pipelines. Corrosion of metal pipelines is one of the important reasons for the leakage and failure of pipeline networks, and about 20% of them are caused by the action of microorganisms. The electrochemical test method is widely used in the experimental research of metal pipeline corrosion due to its advantages of rapid continuous and in-situ monitoring. The electrochemical analysis technology can obtain the corrosion data and the growth of microorganisms more comprehensively and accurately. The existing electrochemical monitoring dev...
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