Electrochemical noise experimental method at high temperature and high pressure

Abstract

The invention relates to an electrochemical noise experimental method at a high temperature and a high pressure. The method comprises the following steps: manufacturing an electrochemical noise sensor; arranging equipment required by experiments; constructing an experimental data collecting system; putting into a test solution; establishing a high-temperature and high-pressure environment; recording an electrochemical noise changing process and the like. Aiming at the condition that electrochemical noise in a high temperature and high pressure environment is the blind point and difficulty all the way in the field of electrochemical noise, the electrochemical noise experimental method at the high temperature and the high pressure is a direction of development in the future. The mechanism of corrosion at a constant temperature is basically known by people while researches on the corrosion mechanism under the high temperature and high pressure water environment are few. The primary cause is shortage of researching paths and backwardness of instruments as well as huge difficulty on researches in the high temperature and high pressure water environment. However, emergence of electrochemical noise makes researches on corrosion mechanism at the high temperature and high pressure possible.

Description

technical field [0001] The invention belongs to the technical field of material corrosion detection, in particular to an electrochemical noise experimental method under high temperature and high pressure. Background technique [0002] The basic principle of the electrochemical corrosion detection method is to add a corresponding number of electrodes in the corrosion solution, and detect the electrical signal between the corrosion electrodes to characterize the corrosion tendency and study the corrosion mechanism; the specific methods include steady state polarization method, electrochemical impedance spectroscopy, and electrochemical noise. Regardless of the steady-state polarization method or the electrochemical impedance spectroscopy method, it is necessary to establish a system function of the corrosion system, and judge the basic situation of corrosion according to the system function. Apply input (current and potential) to the corrosion system, and measure the output o...

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Problems solved by technology

[0003] Since the essence of corrosion is the gain and loss of electrons, and the metal loses electrons and becomes metal ions, the gain and loss of electrons in the corrosion process will inevitably cause fluctuations in current and potential, and this fluctuation is called electrochemical noise; The external environment has nothing to do with the specific conditions of the corrosion system; from the definition of electrochemical noise, it detects the fluctuation of potential and current caused by the gain and loss of electrons of metal elements during the corrosion process, so it has no interference with the corrosion system. It can retain the information in the corrosion process to the greatest extent, and it is the best way to study the phenomenon and principle of corrosion; however, there is no experimental method for electrochemical noise under high temperature and high pressure that can be used for reference.

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