CN108061704A - A kind of single electrode crossed array wire beam electrode system corroded under Test coverage object - Google Patents

Abstract

The present invention relates to the single electrode crossed array wire beam electrode systems corroded under a kind of Test coverage object.Its technical solution is：The preformed hole of matched electrodes size is provided under dirt pond, single electrode crossed array wire beam electrode is installed in preformed hole, preconfigured fouling products is added in dirt pond, electrode is covered to certain depth, form surface covering, and pH meters, temperature sensor and dissolved oxygen sensor are installed in dirt pond, measures the acid-base value, temperature and dissolved oxygen amount of dirt, single electrode crossed array wire beam electrode is connected to corrosion tester by conducting wire and switch.Advantageous effect is：Auxiliary electrode, working electrode and reference electrode are divided into small test cell by the present invention, the corrosion electrochemistry information of each working electrode is measured in small test cell, significantly reduce has covering on surface, due to the corrosion electrochemistry information measurement error that electrode surface covering causes electrode working environment different and brings.

Description

A Single-electrode Cross-Array Wire Beam Electrode System for Testing Under-Cover Corrosion

technical field

The invention relates to the field of electrochemical testing, in particular to a single-electrode cross-array filament electrode system for testing under-cover corrosion.

Background technique

Dirt deposition on the surface of metal materials has a crucial impact on the corrosion behavior of metal materials. The physical and chemical properties of dirt affect the electrochemical properties, mass transport process and surface shear force of metal materials, directly affecting the corrosion of metal materials. anodic and cathodic reaction process. When the existing surface wire beam electrode is used to study the corrosion behavior of metal materials under the surface covering, its reference electrode, working electrode, and auxiliary electrode are all placed in the electrolyte separately, separated by a large distance, and the solution environment and flow When the field environment is different and there is a covering on the surface of the working electrode, the dirt deposition on the surface of each electrode is different during the experiment, which affects the accurate measurement of corrosion electrochemical information. Wire Beam Electrode (WBE), as an emerging electrochemical research technology, can obtain local corrosion information on the electrode surface. Many tiny electrodes are formed on the surface of the wire beam electrode. When these tiny metal wires are coupled together, the electrochemical parameters on the whole electrode can be obtained. When the metal wires are disconnected, each metal wire represents a working electrode, corresponding to The electrochemical parameters at different positions are measured for each metal wire separately, and the local corrosion information at different positions can be obtained. The Ag/AgCl reference electrode has a wide range of applications, has good stability and long life, and the auxiliary electrode material is Ag, which has good chemical stability. The Chinese document "The Influence of Deposits in 20# Carbon Steel Pipelines on Corrosion Behavior" describes the use of the wire beam electrode test device to determine the distribution characteristics of local corrosion on the metal surface with or without coating, but the reference electrode and the wire beam electrode are placed in the solution respectively. Among them, the measured electrochemical parameters of corrosion are affected by the corrosion product coverage or deposits on the metal surface, resulting in large errors in the measured electrochemical parameters.

Contents of the invention

The purpose of the present invention is to address the above-mentioned defects in the prior art, and to provide a single-electrode cross-array wire beam electrode system for testing under-cover corrosion. Through the single-electrode cross-array wire beam electrode technology, it can more accurately obtain the Corrosion electrochemical information in case of covering.

The present invention mentions a single-electrode cross-array wire beam electrode system for testing under-cover corrosion, and its technical solution is: including a corrosion electrochemical parameter testing device, a single-electrode cross-array wire beam electrode (4), and a corrosion test device ( 8), the surface covering (7), the corrosion electrochemical parameter testing device is to open a reserved hole (5) matching the size of the single-electrode cross-array wire bundle electrode (4) under the dirt pool (1), and the reserved hole Install the single-electrode cross-array wire beam electrode (4) in (5), add pre-configured dirt into the dirt pool, cover the electrode to a certain depth, and form a surface covering on the upper surface of the single-electrode cross-array wire beam electrode (4) (7), and a pH meter (2), a temperature sensor (3) and a dissolved oxygen sensor (6) are installed in the dirt pool (1), through the pH meter (2), the temperature sensor (3), the dissolved oxygen The sensor (6) measures the pH, temperature and dissolved oxygen of the dirt, and the single-electrode cross-array wire beam electrode (4) is connected to the corrosion test device (8) through wires and switches.

The above-mentioned single-electrode cross-array wire beam electrode (4) includes auxiliary electrode (9), working electrode (10) and reference electrode (11), and is distributed on the wire beam electrode surface in a cross-arranged manner, and will be crossed adjacent to each other during measurement. The auxiliary electrode (9), working electrode (10) and reference electrode (11) are divided into multiple rectangular test units (12), and the corrosion electrochemical information of each working electrode is measured in the rectangular test unit (12), and the The measured electrochemical information of each working electrode is integrated to obtain the corrosion electrochemical information of the entire wire beam electrode surface.

The single-electrode cross-array wire beam electrode (4) includes an auxiliary electrode (9), a working electrode (10) and a reference electrode (11), wherein the working electrode (10), the reference electrode (11) and the auxiliary electrode (9 ) are respectively arranged in columns, and the electrodes of adjacent columns are dislocated and arranged on the surface of the tow electrode, and the auxiliary electrode (9), working electrode (10) and reference electrode (11) in the equilateral triangle are divided into a triangular test unit (13), measure the corrosion electrochemical information of each working electrode in the triangular test unit (13), and integrate the measured electrochemical information of each working electrode to obtain the corrosion electrochemical information of the entire wire bundle electrode surface.

The beneficial effect of the present invention is that: in the cyclic corrosion test system, the present invention can more accurately test the corrosion situation under the covering on the electrode surface, and through the unique arrangement of single-electrode cross-array wire bundle electrodes, the auxiliary electrode, working electrode and The reference electrodes are cross-arranged on the surface of the wire beam electrode, and the left and right adjacent auxiliary electrodes, working electrodes and reference electrodes are divided into small test units, and the corrosion electrochemical information of each working electrode is measured in the small test units, and integrated The data were then obtained for corrosion electrochemical information across the entire tow electrode surface. Since the distance between the electrodes in each small test unit is very small, and they are all located under the surface covering, it greatly reduces the electrochemical corrosion caused by the different working environments of the electrodes due to the surface covering of the electrodes. Information measurement error.

Description of drawings

Accompanying drawing 1 is the schematic diagram of corrosion electrochemical parameter testing device of the present invention;

Accompanying drawing 2 is a schematic diagram of the rectangular arrangement of single-electrode cross-array filament electrodes of the present invention;

Accompanying drawing 3 is the schematic diagram that has covering among Fig. 2;

Accompanying drawing 4 is the triangular arrangement mode of single-electrode cross-array filament electrode of the present invention and cover schematic diagram;

Accompanying drawing 5 is the schematic diagram that has covering among Fig. 4;

Accompanying drawing 6 is the side view and measurement system of single-electrode cross array wire beam electrode;

Above: dirt pool (1), pH meter (2), temperature sensor (3), single-electrode cross-array wire electrode (4), reserved hole (5), dissolved oxygen sensor (6), surface covering object (7), corrosion testing device (8), auxiliary electrode (9), working electrode (10) and reference electrode (11), rectangular testing unit (12), and triangular testing unit (13).

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Embodiment 1, referring to accompanying drawing 1, a kind of single-electrode cross-array wire beam electrode system for testing under-cover corrosion mentioned in the present invention, its technical scheme is: comprise corrosion electrochemical parameter testing device, single-electrode cross-array wire bundle Electrode (4), corrosion test device (8), surface covering (7), and corrosion electrochemical parameter test device are reserved under the dirt pool (1) to match the size of the single-electrode cross-array wire bundle electrode (4) hole (5), install the single-electrode cross-array wire beam electrode (4) in the reserved hole (5), add pre-configured dirt into the dirt pool, cover the electrode to a certain depth, and install the single-electrode cross-array wire beam electrode (4) A surface covering (7) is formed on the upper surface, and a pH meter (2), a temperature sensor (3) and a dissolved oxygen sensor (6) are installed in the dirt pool (1), and the pH meter (2) , a temperature sensor (3), and a dissolved oxygen sensor (6) measure the pH, temperature and dissolved oxygen of the dirt, and the single-electrode cross-array wire bundle electrode (4) is connected to the corrosion test device (8) through wires and switches.

Referring to Figures 2-3, the single-electrode cross-array wire beam electrode (4) includes an auxiliary electrode (9), a working electrode (10) and a reference electrode (11), and is distributed on the surface of the wire beam electrode in a cross-arranged manner. In the measurement, the cross-adjacent auxiliary electrodes (9), working electrodes (10) and reference electrodes (11) are divided into multiple rectangular test units (12), and each working electrode is measured in the rectangular test units (12). Corrosion electrochemical information, after integrating the measured electrochemical information of each working electrode, the corrosion electrochemical information of the entire wire bundle electrode surface is obtained. Since the distance between the electrodes in each small test unit is very small, and they are all located under the surface covering (7), it greatly reduces the problem caused by the different working environments of the electrodes due to the surface covering of the electrodes when the surface is covered. Corrosion electrochemical information measurement error.

Referring to Fig. 6, a single-electrode cross-array wire beam electrode used for testing corrosion under surface coverings, the whole electrode is sealed by injecting epoxy. Each electrode is connected through a wire, the wire is provided with a switch, and is connected to the corrosion testing device (8) through the wire switch.

Example 2, see accompanying drawings 4-5, a single-electrode cross-array wire beam electrode system for testing under-cover corrosion mentioned in the present invention, the single-electrode cross-array wire beam electrodes adopt a triangular arrangement and a schematic diagram of the cover, single The electrode cross-array wire beam electrode (4) includes an auxiliary electrode (9), a working electrode (10) and a reference electrode (11), wherein the working electrode (10), the reference electrode (11) and the auxiliary electrode (9) are respectively Arranged in columns, the electrodes of adjacent columns are dislocated on the surface of the wire bundle electrode, and the auxiliary electrode (9), working electrode (10) and reference electrode (11) in the equilateral triangle are divided into a triangular test unit (13 ), measure the corrosion electrochemical information of each working electrode in the triangular test unit (13), and integrate the measured electrochemical information of each working electrode to obtain the corrosion electrochemical information of the entire wire bundle electrode surface. Since the distance between the electrodes in each small test unit is very small, and they are all located under the surface covering (7), it greatly reduces the problem caused by the different working environments of the electrodes due to the surface covering of the electrodes when the surface is covered. Corrosion electrochemical information measurement error.

The above descriptions are only some of the preferred embodiments of the present invention, and any person skilled in the art may modify the technical solutions described above or modify them into equivalent technical solutions. Therefore, any simple modification or equivalent replacement made according to the technical solution of the present invention falls within the protection scope of the present invention.

Claims (3)

1. A single-electrode cross-array wire beam electrode system for testing corrosion under coverings, characterized in that it includes a corrosion electrochemical parameter testing device, a single-electrode cross-array wire beam electrode (4), a corrosion test device (8), a surface Covering (7), the corrosion electrochemical parameter testing device is to have a reserved hole (5) matching the size of the single-electrode cross-array wire beam electrode (4) under the dirt pool (1), and in the reserved hole (5) Install the single-electrode cross-array wire beam electrode (4), add pre-configured dirt into the dirt pool, cover the electrode to a certain depth, and form a surface covering (7) on the upper surface of the single-electrode cross-array wire beam electrode (4), And a pH meter (2), a temperature sensor (3) and a dissolved oxygen sensor (6) are installed in the dirt pool (1), through the pH meter (2), the temperature sensor (3), and the dissolved oxygen sensor (6) To measure the pH, temperature and dissolved oxygen of the dirt, the single-electrode cross-array wire beam electrode (4) is connected to the corrosion test device (8) through wires and switches. 2. The single-electrode cross-array wire beam electrode system for testing under-cover corrosion according to claim 1, characterized in that: the single-electrode cross-array wire beam electrode (4) includes an auxiliary electrode (9), a working electrode ( 10) and the reference electrode (11), and are distributed on the surface of the wire beam electrode by means of a cross arrangement, and the cross-adjacent auxiliary electrode (9), working electrode (10) and reference electrode (11) are divided into A plurality of rectangular test units (12), measuring the electrochemical corrosion information of each working electrode in the rectangular test unit (12), and integrating the measured electrochemical information of each working electrode to obtain the corrosion resistance of the entire wire bundle electrode surface Corrosion Electrochemistry Information. 3. The single-electrode cross-array wire beam electrode system for testing under-cover corrosion according to claim 1, characterized in that: the single-electrode cross-array wire beam electrode (4) includes an auxiliary electrode (9), a working electrode ( 10) and the reference electrode (11), wherein the working electrode (10), the reference electrode (11) and the auxiliary electrode (9) are respectively arranged in rows, and the electrodes of adjacent columns are arranged in dislocation on the surface of the wire bundle electrode, Divide the auxiliary electrode (9), working electrode (10) and reference electrode (11) in the equilateral triangle into a triangular test unit (13), and measure the corrosion electrochemistry of each working electrode in the triangular test unit (13) Information, after integrating the measured electrochemical information of each working electrode, the corrosion electrochemical information of the entire wire beam electrode surface is obtained.