Device and method for measuring ion accumulation on electrode surface under action of direct current electric field

Abstract

The invention discloses a measuring device and method for ion accumulation on an electrode surface under the action of a DC electric field. The device includes: a boosting circuit and a measuring circuit; the boosting circuit passes through a power supply, a transformer, a rectifying device and a current limiting resistor from left to right Formed in series in sequence; the measurement circuit is poured into the glass vessel through the sample solution, the iron rod electrode is inserted into the sample solution, one end of the iron rod electrode is connected to the high voltage end of the boost circuit, and the other end is connected to the positive pole of the oscilloscope; one end of the iron plate electrode is connected to the booster The low-voltage end in the pressure circuit is grounded, and the other end is connected to the negative pole of the oscilloscope. According to the principle of capacitive voltage division, it can be seen that the magnitude of the voltage distribution of the sample solution is not much different from the applied electric field, and the detection voltage will produce a larger amplification effect relative to the detection current. In the present invention, after removing the external electric field and short-circuiting the discharge, the two ends of the rod-plate electrode are short-circuited twice again, and the change of the residual charge on the electrode surface can be more clearly observed according to the recovery process of the potential change.

Description

technical field [0001] The invention relates to the technical field of water-attached corrosion on the surface of metal fittings, in particular to a measuring device and method for ion accumulation on an electrode surface under the action of a direct current electric field. Background technique [0002] The corrosion of insulator hardware is widespread in UHVDC transmission lines, which seriously affects the safe operation of transmission lines. Relevant scholars at home and abroad have carried out research on the corrosion of metal fittings in DC transmission lines, and believe that electrolytic corrosion caused by leakage current is the main cause of corrosion of metal fittings. It has become an important factor for the corrosion of insulator metal fittings. The electrochemical corrosion caused by the adsorption of water droplets on the surface of insulator fittings is an important reason for the corrosion of insulator metal fittings. [0003] In fact, it is difficult to ...

AI Technical Summary

Problems solved by technology

First, because the power of the power supply and the current that can flow through the current measurement module are limited, the charging and discharging process of the insulator capacitor cannot be completed instantaneously, resulting in a large error in the measurement results

Second, because the tested sample is an electrolyte and the solution is a non-dielectric, the migration mechanism of ions in the solution under the action of an electric field is different from that of a solid dielectric, and the measured small current is easily affected by external disturbances.

Images