Flexible Array Reference Electrode and Its Method for In-Situ Study of Metal Weld Corrosion

Abstract

The invention discloses a flexible array reference electrode, and a method for in situ researches of the corrosion of a metal weld by using the electrode. The flexible array electrode is composed of a flexible substrate, an array electrode arranged on the surface of the flexible substrate, and a leading wire packaged in the flexible substrate and connected with the array electrode, the array electrode is formed by arranging Ag / AgCl micro-electrodes in an array manner, surface potentials of different micro-areas of the metal surface can be simultaneously obtained, and the flexible substrate with small modulus and flexible deformation is adopted to realize in situ and real time monitoring of the corrosion potential of abnormal complex surface of a metal weldment. The measurement method adopting the flexible array electrode as a reference electrode realizes in situ, lossless, convenient and sensitive detection of the corrosion potentials of the surface weld area, the thermal influence area and the base material area of the metal welding sample in order to observe the generation, development and extinction process of corrosion of different positions of the surface of the metal weldment, and the corrosion resistances of different welding modes in different environments are compared to realize onsite real time monitoring of the corrosion state of the metal weld in the service, so the method is especially suitable for long-term tracking monitoring of the service safety of metal weldments of automobiles, ships, engineering machines and aerospace.

Description

technical field [0001] The invention relates to the technical field of electrochemical detection of corrosion, in particular to a flexible array reference electrode and a method for in-situ research on metal weld seam corrosion using the same. Background technique [0002] Welding is a manufacturing process and technology that joins metals by heating and high temperature. Metals are generally formed by welding during processing. Welding will inevitably lead to changes in the chemical composition and structure of the weld and the heat-affected zone. Various defects and internal stress may also appear, which promote various forms of corrosion. The weld zone often becomes the weak part of the metal structure. At the same time, metal welding processing will lead to complex and diverse shapes of weldments, different sizes of welds, hidden positions, and difficult detection and protection. Metal welds often induce various localized corrosion in the service environment, often caus...

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Problems solved by technology

[0003] The shape of the traditional array electrode is fixed, which cannot adapt to the surface shape of different weldments, and its method of detecting weld corrosion mainly adopts mechanical cutting and sampling for different sections of the weldment, and measures the microstructure and electrochemical analysis of the cut samples. Obviously, this kind of cutting and sampling will inevitably cause damage and damage to the metal weldment, the monitoring site is limited, the measurement is time-consuming and laborious, and it cannot be monitored in real time on site, especially due to the presence of electrochemical corrosion. Due to the polarization problem, the cut discrete samples are obviously different from the actual weldment block, so the measurement of the corrosion performance of the cut small samples cannot represent the actual situation of the weldment, there may be large errors, and the original weld corrosion cannot be carried out on the industrial site. bit, non-destructive, sensitive and accurate detection and evaluation

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