Electrochemical three-electrode system device and online testing method

Abstract

The invention discloses an electrochemical three-electrode system device and an online testing method. The device comprises an auxiliary electrode, a reference electrode and a working electrode, wherein the auxiliary electrode, the reference electrode and the working electrode are fixed in a container; the auxiliary electrode is composed of an auxiliary electrode wire, a rectangular electrode plate and an auxiliary electrode suspension wire which are sequentially connected, and the auxiliary electrode wire and the auxiliary electrode suspension wire are fixed in the container; the reference electrode is composed of a connected platinum rod and tip and is fixed in the container; the working electrode is composed of a connected wire and working surface and is fixed in the container; the reference electrode and the working electrode are arranged in an area enclosed by the rectangular electrode plates, and the working surface of the working electrode is immersed in a test liquid in the container; since the auxiliary electrode is integrally cut by a platinum sheet, no welding exists; the working electrode is formed by mechanical processing of the same material, so that welding and insulation packaging problems can be avoided; and the reference electrode is made of the platinum rod, so that the testing process is not limited by the temperature and pressure of the test solution, and online testing can be realized at any temperature and in any pressure solution.

Description

technical field [0001] The invention relates to an electrochemical three-electrode system device and an online testing method, belonging to the technical field of corrosion electrochemical testing. Background technique [0002] During the use of metal equipment, there is always a certain amount of corrosion in a specific environment. The electrochemical three-electrode system can quickly characterize its corrosion tendency and corrosion behavior. At present, the electrochemical three-electrodes mainly use planar platinum electrodes as auxiliary, saturated calomel electrodes as reference electrodes, metal materials are made into test pieces with a certain area, wires are welded on the back of the working surface, and epoxy resin (or other insulating materials are used) ) package, and the working surface is polished and degreased as the working electrode. There are following disadvantages in using the above method to make electrochemical three electrodes: [0003] 1) The abo...

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Problems solved by technology

[0003] 1) The above three-electrode manufacturing process is only suitable for testing at normal temperature and pressure, not for testing in high temperature and high pressure environments;

[0004] 2) A saturated calomel electrode is used as a reference electrode. Generally, the test solution is neutral and contains chloride ions. Acidic or alkaline or chloride-free test solutions generally need to be used with the help of a salt bridge, but the agar in the salt bridge can be used at high temperatures. Easy to liquefy, making it unusable;

[0005] 3) When the above-mentioned working electrode manufacturing method is used in a high-temperature and high-pressure environment, due to the difference in thermal expansion and contraction coefficients between the metal and the packaging material, crevice corrosion is prone to occur at the interface, which affects the test results

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