Experimental method and device for sacrificial anode electrochemical performance in high-temperature environment

Abstract

The present invention discloses an experimental method and device for sacrificial anode electrochemical performance in high-temperature environment. The method comprises following steps: weighing original weight of a sacrificial anode sample; using a plurality of reference electrodes to measure open circuit potentials at different positions of the sacrificial anode sample disposed in a beaker testmedium; adjusting a loop current, to measure working potentials at different positions of the sacrificial anode sample; cleaning intergranular corrosion and semi-detached grains of the sacrificial anode sample;and weighing the anode sample and calculating actual capacitance of the sacrificial anode. The method has the advantages that: the method adopts a transient potential recorder, to improve automation of experimental process; uses a plurality of reference electrodes to test anode potentials, can analyze anode surface dissolution state, while avoiding experimental errors caused by high temperature, anode surface conditions, manual detection and IR drop; improves accuracy of high-temperature capacitance measurement of the sacrificial anode, by cleaning the intergranular corrosion and the semi-detached grains of the sacrificial anode sample; and the high temperature electrochemical experiment device can realize long-term stable experimental conditions and ensure accuracy of detectionresults.

Description

technical field [0001] The invention relates to a method and a device suitable for detecting the electrochemical performance of a sacrificial anode in a high-temperature environment, and belongs to the technical field of sacrificial anode detection. Background technique [0002] At present, sacrificial anodes are more and more widely used in high-temperature environments, but there is a lack of experimental methods and special devices for measuring the electrochemical performance of sacrificial anodes in high-temperature environments. [0003] In the past, the high temperature electrochemical performance test of sacrificial anodes used the experimental method of electrochemical performance of sacrificial anodes at room temperature. . Using the normal temperature sacrificial anode test method, the sample cannot completely remove the intergranular corrosion products through ordinary static immersion and brush cleaning, resulting in the semi-shedding state of the surface grain...

AI Technical Summary

Problems solved by technology

[0002] At present, sacrificial anodes are more and more widely used in high-temperature environments, but there is a lack of experimental methods and special devices for measuring the electrochemical performance of sacrificial anodes in high-temperature environments.

[0003] In the past, the high temperature electrochemical performance test of sacrificial anodes used the experimental method of electrochemical performance of sacrificial anodes at room temperature, and there were the following problems: (1) The actual capacitance decline of sacrificial anodes in high temperature environments was mainly due to the aggravation of intergranular corrosion as the temperature increased, resulting in the loss of grains

Using the normal temperature sacrificial anode test method, the sample cannot completely remove the intergranular corrosion products through ordinary static immersion and brush cleaning, resulting in the semi-shedding state of the surface grains

The weight of the sample that has not been completely cleaned is heavy, and the converted capacitance is higher than the actual capacitance

(2) The surface of the sacrificial anode is prone to uneven dissolution and corrosion product wrapping problems under high temperature environment. The manual measurement of the working potential produces different IR drops due to the different positions of the reference electrode and the different distance from the anode for each measurement, as well as the temperature difference between the experimental temperature and room temperature. The change causes the reference electrode potential to change, resulting in a large deviation in the measured working potential

[0004] The experimental device uses a common water bath, which has the following problems: (1) The experiment needs to add water regularly, which has certain safety risks

Especially above 80 degrees Celsius, the interval between adding water should not exceed 8 hours, which is not convenient for experimenters to operate

(2) The control of the experimental temperature medium is unstable. Due to the lack of sealing device and regular water addition, the experimental conditions are constantly changing, which affects the experimental results.

Images