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Cnt assembled film modified steel wire array electrode, preparation method and application thereof

A technology of array electrodes and steel wires, applied in the field of electrochemical testing, can solve problems such as unavoidable construction joints, debonding of steel wires and epoxy resin layers, etc., to improve debonding, improve sensitivity and long-term performance, and ensure system integrity sexual effect

Active Publication Date: 2021-05-11
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The prior art discloses a tight and regular wire beam electrode obtained by using metal wires and epoxy packaging, and has low cost, good controllability, easy operation, and stable and reliable electrochemical signals; however, the fabrication and Although the two-step epoxy encapsulation method is used in the process of encapsulating the array electrodes, the construction joints left by pouring the epoxy interface layer at different times cannot be avoided; and there is still debonding between the smooth steel wire and the epoxy resin layer, especially after frequent use. Under the circumstances
[0006] At present, there is no preparation method for assembling CNT thin films on steel wire electrodes to prepare electrode wires with excellent performance.

Method used

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  • Cnt assembled film modified steel wire array electrode, preparation method and application thereof

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preparation example Construction

[0065] In order to better understand the CNT assembled thin film modified steel wire array electrode of the present invention, the present invention also provides a preparation method of a CNT assembled thin film modified steel wire array electrode, comprising the following steps:

[0066] (1) A plurality of steel wires 1 are subjected to a certain treatment process, so that the surface of the steel wire 1 is negatively charged to modify the effect, and a negatively charged modified steel wire 1 is obtained;

[0067] (2) Using the LBL alternate assembly process, the surface layer of the negatively charged modified steel wire 1 obtained in step (1) is assembled with a multi-layer CNT film 2 to prepare a CNT assembled film modified steel wire 1;

[0068] (3) Weld one end of the CNT assembled film modified steel wire 1 obtained in step (2) to one end of the wire, and use an insulating heat-shrinkable tube to insulate and wrap the welded part to form a modified electrode wire;

[...

Embodiment 1

[0075] A method for preparing a CNT assembled thin film modified steel wire array electrode provided by the invention;

[0076] The steel wire used is Q235D, and the CNT assembly film is a 2-layer double-walled CNT film.

[0077] Include the following steps:

[0078] like figure 1 As shown, in the first step, 121 steel wires with a diameter of 1.5 mm and a length of 50 mm are used in an ozone treatment process (treatment in a closed environment for 24 hours) to achieve a negatively charged modification effect on the surface of the metal wire;

[0079] In the second step, the LBL alternate assembly process (10min positively charged electrolyte ~ 3min deionized water rinsing ~ 15min air drying ~ 20min negatively charged CNT) was assembled on the surface of 121 negatively charged modified steel wires with 2 layers of CNT double walls. Film, made of CNT assembly film modified steel wire;

[0080] The third step is to weld one end of 121 CNT-assembled film-modified steel wires t...

Embodiment 2

[0086] The steel wire used in the preparation method in this embodiment is Q335B, and the CNT assembly film is a 6-layer double-walled CNT film. Other steps of the method are the same as those in Embodiment 1, and will not be repeated here.

[0087] performance testing

[0088] After the epoxy resin is solidified, the surface layer of resin is polished off, and the electrochemical workstation is used to sequentially test after soaking in simulated seawater (3.5% NaCl solution) containing concrete corrosion solution for 2h, 1d, 3d, 7d, 21d, 30d, and 60d respectively. The current between each electrode wire and the remaining 120 electrode wires coupled together, it is found that the corresponding current distribution diagram also begins to appear anodic current peak after 7 days; and as the soaking time prolongs, its peak value increases significantly, At 60d, its maximum anode current reaches 12.38μA.cm -2, indicating that after the Q335B steel was soaked in simulated seawater...

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Abstract

The invention provides a CNT assembled film modified steel wire array electrode, a preparation method and its application. The array electrode includes: the surface of the steel wire is negatively charged, and the surface of the steel wire is assembled with a multi-layer CNT film; The welding part of the wire is wrapped with insulating heat-shrinkable tube; the insulating formwork is provided with a number of evenly arranged holes, and the other end of each steel wire is inserted into the hole of the insulating formwork; the insulating formwork and the steel wire are encapsulated and cured with epoxy resin . The preparation method of the array electrode of the present invention mainly includes the following steps: firstly carry out negative electricity modification on the steel wire, then assemble a CNT film on the steel wire, and finally prepare the modified array steel wire into a CNT assembled film modified steel wire array electrode; Applying the array electrode to local corrosion detection and early warning of steel bars in marine structures can improve the sensitivity and long-term effectiveness of local corrosion detection of marine structures.

Description

technical field [0001] The invention belongs to the technical field of electrochemical testing, and in particular relates to a CNT assembled thin film modified steel wire array electrode, a preparation method and an application thereof. Background technique [0002] In the harsh marine environment, engineering structures such as building structures, bridges and tunnels, wind power nuclear power, drilling platforms, seaport terminals, and thermoelectric chimneys often fail prematurely due to corrosion. Among the three major factors of steel corrosion, freezing damage and physical and chemical effects, steel corrosion is the most important factor affecting the durability of marine structures. The survey also found that the safe service life of the project in the marine environment is only 15 to 20 years due to the corrosion of steel bars, and the service life is far lower than the expected value of the code design. Existing scholars have developed a steel corrosion current se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 罗健林金祖权诸雪松
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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