Metallic corrosion velocity measurer and its measuring method adopting AC resistance probe

Abstract

The present invention relates to a metal corrosion speed measurer adopting the alternating current resistance probe and the measuring method thereof, the metal corrosion speed measurer comprises a resistor probe and a collecting device, the resistor probe comprises the following components: a corrosion coupon; a compensating coupon and a probe rod; the collecting device comprises the following components: a casing and a base frame which are sealed and conjunct; a detecting circuit which is arranged in the enclosed space formed by the casing and the base frame; a probe interface which is connected with the detecting circuit; and a communication interface which executes communication connection to the upper machine. The method of the invention comprises the following steps: simultaneously arranging the corrosion coupon and the compensating coupon into the testing medium with same temperature; exerting a same alternating current actuating signal to the corrosion coupon and the compensating coupon; obtaining the actuating response signal at the two ends of the compensating coupon and calculating the attenuated amount of the corrosion coupon, and calculating out the corrosion rate of the metal according to the attenuated amount. The invention has the advantages of small measuring error, high sensitivity, strong anti-interference ability, broad application sphere, and being able to realize the remote on-line measurement.

Description

technical field [0001] The invention relates to a device and method for measuring metal corrosion rate, in particular to a metal corrosion rate measuring instrument using an AC resistance probe and a measuring method thereof. Background technique [0002] In recent years, domestic chemical companies have refined a large number of high-sulfur and high-acid crude oil, which has intensified the corrosion of equipment and caused more serious problems. Corrosion is constantly bringing economic losses to companies and threatening human lives. The occurrence of corrosion has a great impact on Corrosion real-time detection puts forward higher requirements. Petrochemical corrosion can be divided into low-temperature corrosion and high-temperature corrosion. Low-temperature corrosion mainly includes electrochemical corrosion of industrial cooling water, water and hydrogen sulfide in crude oil medium, electrochemical corrosion of hydrochloric acid, etc. High-temperature corrosion mainl...

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Problems solved by technology

The electrochemical measurement adopts the linear polarization measurement method, and the measurement result reflects the instantaneous corrosion of the metal by the medium, which is only applicable to the medium condition with electrolyte, so the application is limited, and the measurement result will be affected by the system and will produce a maximum of 200% error

The common resistance probe measurement method is based on metal loss, and its measurement results reflect the uniform corrosion of the metal by the medium, and can be applied in all mediums, but its measurement sensitivity is too low, so in a short time The value of low corrosion rate cannot be measured. At the same time, the filiform corrosion specimen has a small cross-sectional area, low strength, and short life, and localized corrosion will cause large errors in the measurement results for filiform corrosion specimens. The temperature compensation method The defects will also cause large errors in the measurement results, so it is difficult to guarantee the accuracy of the measurement

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