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

A flexible array and reference electrode technology, applied in the direction of material electrochemical variables, material analysis through electromagnetic means, instruments, etc., can solve non-destructive and sensitive and accurate detection and evaluation, can not adapt to different surface shapes of welded parts, can not be welded In-situ seam corrosion and other problems, to achieve the effect of low cost, excellent high and low temperature resistance, and sensitive response

Active Publication Date: 2019-04-26
厦门昕钢防腐工程科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

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Embodiment 1

[0034] Such as figure 1 and figure 2 As shown, a flexible array electrode 1 for in-situ detection of metal weld corrosion consists of a flexible substrate 11, an array electrode 12 arranged on the surface of the flexible substrate 11, and is packaged in the flexible substrate 11 and connected with the array electrode 12 connected lead wires 13, the array electrode 12 is made of Ag / AgCl microelectrode array.

[0035] The preparation method of the flexible array reference electrode is as follows:

[0036] Print electrode cores and lead wires 13 on a flexible substrate by means of an adhesive-free flexible printed circuit board. The diameter of the electrode cores is 0.2-2mm, and the interval between each electrode is 0.5-4mm. , tin, silver, gold and other metals, its thickness is 1 / 3-2OZ, the spacing is 0.075-2mm, it is neatly and orderly packaged in the flexible substrate 11, and the end of the lead wire 13 forms a lead wire Interface 14, the lead wire spacing at the lead w...

Embodiment 2

[0041] Prepare flexible array electrodes according to the structure and preparation method described in Example 1, wherein the substrate material is polyimide, the thickness is 0.1mm, the size is 2cm×6cm, and the substrate surface array has 4×8 diameters of 1mm Ag / AgCl microelectrode, the interval between each electrode is 2mm; the thickness of the lead wire is 1 / 2OZ, the lead wire spacing at the lead wire interface is 0.5mm, and the 6mm interface is reinforced with PI.

[0042] When electroplating the silver film, adjust the pH to 10 with potassium hydroxide at 0.5A / dm 2Constant-current silver plating was carried out for 2 hours at a constant current; during anodic chlorination, the concentration of the HCl solution was 0.1mol / L, and a constant-current anodic chlorination was carried out at a current of 0.1mA / cm for 6 hours.

[0043] Such as image 3 As shown, the prepared Ag / AgCl microelectrode has a good linear response in the range of chloride ion concentration 0.001-0.1m...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/416
CPCG01N27/301G01N27/416
Inventor 林理文陈阿娇林昌健
Owner 厦门昕钢防腐工程科技有限公司
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