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System and method for testing local corrosion of multi-electrode coupled inhomogeneous structure

A test system and local corrosion technology, applied in the field of electrochemistry, can solve the problem of inability to localize measurement or scan the electrochemical characteristics of different positions on the surface of the electrode.

Inactive Publication Date: 2017-09-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-electrode coupled non-uniform structure localized corrosion solution for the above-mentioned problems in the existing research process of non-uniform structure localized corrosion. The test system and method, the test system and method prepare the non-uniform structure as an array electrode, which can distinguish the difference in electrochemical characteristics in different regions, and accurately reflect the localized corrosion and its electrochemical process

Method used

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  • System and method for testing local corrosion of multi-electrode coupled inhomogeneous structure

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Embodiment 1

[0065] Embodiment 1: Carry out partial electrochemical test to microelectrode array by microelectrode array test system, its specific steps are as follows:

[0066] After all the array electrodes are coupled by the high-speed matrix switch of the microelectrode array test system, the galvanic potential and galvanic current of the array electrodes are scanned one by one through the high-speed matrix switch to obtain the galvanic corrosion state and localized corrosion of the microelectrode array current density.

[0067] The test process is: open the microelectrode array test system software, use the high-speed matrix switch to couple all the array electrodes, and then regularly scan the galvanic couple potential and galvanic current of the array electrodes one by one, generally every 2 hours, or 1 Scan every day, or every 5 days.

[0068] Take the scanning test of the i-th array electrode as an example to illustrate the above scanning process, see Figure 1a-Figure 1d , Fi...

Embodiment 2

[0069] Embodiment 2: Carry out classical electrochemical test to microelectrode array by microelectrode array test system and classic electrochemical comprehensive test system, its specific steps are as follows:

[0070] see Figure 2a , use the high-speed matrix switch of the microelectrode array test system to couple a certain part of the microelectrode array together as the working electrode, and connect it to the working electrode terminal of the classic electrochemical comprehensive test system. The parameters of the classic electrochemical comprehensive test system The terminal of the specific electrode is connected to the reference electrode, the terminal of the auxiliary electrode of the classic electrochemical comprehensive test system is connected to the auxiliary electrode, the working electrode, reference electrode and auxiliary electrode are placed in the electrolyte solution of the electrolytic cell, and the open circuit potential, Linear polarization resistance,...

Embodiment 3

[0077] Embodiment 3: Carry out classic electrochemical test to microelectrode array by microelectrode array test system and classic electrochemical comprehensive test system, its specific steps are as follows:

[0078] see Figure 3a , the microelectrode in the local area of ​​interest is switched by the high-speed matrix switch of the microelectrode array test system, and the output end of the high-speed matrix switch is connected to the working electrode terminal of the classic electrochemical comprehensive test system, the classic electrochemical comprehensive test system The reference electrode terminal of the test system is connected to the reference electrode, the auxiliary electrode terminal of the classic electrochemical comprehensive test system is connected to the auxiliary electrode, and the working electrode, reference electrode and auxiliary electrode are placed in the electrolyte solution of the electrolytic cell to perform array electrode The electrochemical imp...

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Abstract

The invention relates to a system and a method for testing local corrosion of a multi-electrode coupled inhomogeneous structure. Three testing systems including a classic electrochemical comprehensive testing system, a micro-area electrochemical testing system and a micro-electrode array testing system are arranged in the system; the three testing systems can be used for testing separately and any two testing systems also can be combined together; by using a micro-electrode array as a bridge and a bond, the three testing systems are coupled and combined, three tests of a classic electrochemistry test, a micro-electrode array test and a micro-area electrochemistry test can be carried out, and overall average information such as self-corrosion potential, self-corrosion current density, polarization property and electrochemical impedance spectroscopy, local distribution information such as galvanic potential and galvanic current having certain statistical characteristics, and micro-area distribution information of local cathode and anode areas in a local corrosion process of an inhomogeneous structure can be acquired and effectively associated on aspects of large scale, middle scale and small scale.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to corrosion electrochemical test technology, in particular to a multi-electrode coupling non-uniform structure localized corrosion test system and method, which are used for multi-electrode coupling non-uniform structure localized corrosion research. Background technique [0002] Various non-uniform structures are often encountered in various fields of the national economy, and the composition of these non-uniform structures has the following two types. One is composed of multiple components, for example: the weld joint is composed of multiple components such as the base metal area, heat-affected zone and weld area; the other is composed of multiple metal or alloy materials, such as: The surface of the hull is composed of steel hull, copper alloy screw propeller and aluminum-based sacrificial anode and other materials. Since the corrosion potential and polarization characte...

Claims

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Application Information

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IPC IPC(8): G01N17/02G01N17/00
CPCG01N17/006G01N17/02
Inventor 李焰李亚东唐晓
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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