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Couple corrosion sensor

A technology of corrosion sensors and galvanic couples, applied in the direction of material electrochemical variables, etc., can solve problems such as changes in cathode reaction conditions, corrosion of metal materials, and influence on the accuracy of corrosion monitoring, and achieve the effect of enhancing effectiveness and monitoring accuracy

Active Publication Date: 2013-04-03
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, in the process of use, the metal material of the cathode itself will appear localized corrosion, which will change the reaction status of the cathode and affect the accuracy of the monitoring current.
[0004] The surface of some metal substrates to be tested will be thermally sprayed with other metal coatings. Since the materials of the two poles of the galvanic couple are metal sheets, the composition of the anode is different from that of the coating, which affects the accuracy of corrosion monitoring and limits the type of galvanic couple. Corrosion sensor application range

Method used

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Embodiment Construction

[0019] Such as figure 1 , 2 As shown, a kind of galvanic couple type corrosion sensor of the present invention comprises a body, and the body consists of

[0020] The metal electrode 3, the insulating sheet 2 and the carbon film electrode 1 are stacked together in sequence. The metal electrode 3 and the carbon film electrode 1 are electrically connected to the electrode lead-out wire 4, and a number of penetrating metal electrodes 3 and insulating sheets 2 are arranged on the body. And the through hole of the carbon film electrode 1. The carbon film electrode 1 is made of 99.9% high-purity graphite, which is an inert material and will not corrode in the environment. The electrode lead wire 4 is connected to the metal electrode 3 and the carbon film electrode 1 through conductive silver paste, and is sealed with an adhesive. In order to monitor more accurately, before assembly, the same coating as the coating on the metal material to be monitored is hot dipped, thermally spr...

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Abstract

The invention provides a couple corrosion sensor which comprises a body. The body is composed of a metal electrode, an insulating sheet and a carbon film electrode successively superposed from top to bottom, wherein the metal electrode and the carbon film electrode are both in electric connection with an electrode outlet wire, and the body is provided with a plurality of through holes penetrating the metal electrode, the insulating sheet and the carbon film electrode. The invention has the following beneficial effects: when the carbon film electrode made of graphite is used as a cathode and exposed in an environment, corrosion does not occur, so cathode reaction conditions do not change, and no influence is exerted on weak corrosion current. A coating material and technology used for preparation of the surface of the metal electrode are identical to those of a metal to be monitored, so validity of monitoring is enhanced. Arrangement of the plurality of through holes amplifies the weak corrosion current, so monitoring is more accurate.

Description

technical field [0001] The invention relates to a galvanic couple type corrosion sensor, belonging to the technical field of metal material and coating corrosion detection. Background technique [0002] At present, due to different corrosion potentials, localized corrosion at the contact of dissimilar metals in the same medium is galvanic corrosion, also known as contact corrosion or bimetallic corrosion. The two metals constitute a macro cell, which generates a galvanic current, which increases the dissolution rate of the metal with a lower potential (anode) and decreases the dissolution rate of a metal with a higher potential (cathode). Therefore, the cathode is protected by the anode. The galvanic corrosion sensor made according to this principle is mainly used to monitor the corrosion of metal materials, and has the characteristics of simple principle and real-time monitoring. [0003] The two pole materials of the galvanic corrosion sensor are generally selected as d...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 王晓明李辛庚岳增武王学刚刘爽樊志彬闫风洁王宏肖世荣张都清李红梅
Owner STATE GRID CORP OF CHINA
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