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Electrochemical testing device for metal failure under liquid film and testing method thereof

A technology of testing device and testing method, which is applied in measurement devices, scientific instruments, instruments, etc., can solve the problems of high throughput and high work efficiency, and the thickness of liquid film cannot be maintained for a long time, so as to achieve the effect of simple and easy-to-control equipment.

Active Publication Date: 2021-03-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this technology is that there is evaporation of the solution so that the thickness of the liquid film cannot be maintained for a long time. To solve this problem, it is necessary to add a spray device to maintain the humidity
However, the use of traditional array electrodes is only a simple single-array electrode test, which has certain shortcomings and has not fully utilized its advantages of high throughput and high work efficiency.

Method used

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  • Electrochemical testing device for metal failure under liquid film and testing method thereof
  • Electrochemical testing device for metal failure under liquid film and testing method thereof
  • Electrochemical testing device for metal failure under liquid film and testing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In this example, see figure 1 and Figure 4 , a metal failure electrochemical testing device under a liquid film, comprising a spray box, a control spray device, a sample stage, a device for controlling the thickness of a liquid film, an electrochemical workstation, a working electrode probe and a computer; The flow providing device includes a liquid tank 3 and a working box 24, the liquid tank 3 is used to store the liquid of the required spray type; the top of the working box 24 includes a sealing cover 25 with a sealing ring, and the sealing cover 25 is transparent to see the internal situation, and the working box The middle part of 24 is provided with a sample stage support plate 6, and the support plate 6 is used to place the sample stage, and the space reserved at the bottom of the work box 24 can collect the liquid condensed by spraying and discharge it through the liquid discharge pipe; small holes are reserved in the box wall of the work box 24 5. Seal the sm...

Embodiment 2

[0056] This embodiment is basically the same as Embodiment 1, especially in that:

[0057] In this example, see figure 2 and Figure 4, the sample table includes a base 14 and a working platform, two parallel support lugs 9 are fixedly arranged on the base 14, the support lugs 9 are vertically connected with the base 14, the support lugs 9 are provided with threaded holes, and the screw rod 16 The external thread is adapted to the internal thread of the supporting ear plate 9, and the nut 17 is fixedly connected to one end of the screw rod 16. The working platform is arranged between the two supporting ear plates 9, and the middle part of the working platform is fixedly connected to the body of the screw rod 16. By twisting the nut 17 to make the screw 16 turn through the required angle, the inclination state of the surface of the working platform is regulated so that the working platform reaches a horizontal state; three through holes are provided on both sides of the worki...

Embodiment 3

[0063] This embodiment is basically the same as the above-mentioned embodiment, and the special features are:

[0064] In this example, see image 3 and Figure 4 , using two platinum sheets 20, which are attached to the edge of the "pool" respectively, forming disconnected conductive terminals on the bank of the "pool", and connecting the motor 15, power supply 22, brush 18 and two conductive patches with metal wires 23 20 are connected to form a circuit. When the set liquid film thickness is reached, that is, when the "pool" is full, a current loop path state is formed, and the rotor of the motor 15 starts to drive the brush 18 to work, brushing away the excess liquid film on the edge of the "pool". Remove the liquid film, so that after the liquid film between the two conductive patches 20 is brushed off, the electrical connection between the two conductive patches 20 is disconnected, so that the liquid film on the surface of the working electrode 12 can adjust itself and s...

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Abstract

The invention discloses an electrochemical testing device for metal failure under a liquid film and a testing method thereof. The device comprises a spraying box, a spraying control device, a sample table, a liquid film thickness control device, an electrochemical workstation, a working electrode probe and a computer. The device can simulate the corrosion failure process of a metal material in theatmospheric environment under different liquid film thickness conditions, and has the advantages of high flux, high efficiency and simultaneous atmospheric corrosion evaluation and analysis of multiple samples or samples in multiple liquid film thickness environments. The testing method comprises the following steps: assembling a sample table, and setting a spraying program and an environment; performing simulation test; controlling the thickness of a liquid film; carrying out electrochemical testing and recording experimental data. According to the invention, liquid films with different thicknesses and gradient changes can be simulated; the test efficiency can be greatly improved; the device and method can achieve high-flux electrochemical characterization, and have the characteristics of simple and easy-to-control equipment and high accuracy. The device and method have a wide application prospect in the field of metal material atmospheric corrosion research.

Description

technical field [0001] The invention belongs to the field of atmospheric corrosion research of metal materials, in particular to an experimental device for generating a liquid film with a controllable thickness or a liquid film with a gradient thickness, and in particular to a high-throughput method for performing a high-throughput test in the environment of a liquid film with a controllable thickness or a liquid film with a gradient thickness. Electrochemical test method for corrosion failure assessment of metallic materials with high efficiency. Background technique [0002] Atmospheric corrosion of metallic materials refers to a chemical or electrochemical corrosion process covered by a liquid film. In the atmospheric environment, solid particles are deposited on the surface of metal materials. When the relative humidity of the environment reaches a certain critical humidity, water vapor will be condensed to promote the formation of a liquid film with a thickness of sever...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02G01N17/04
CPCG01N17/02G01N17/043
Inventor 李谦范洪强李谋成刘异峰鲁鹏
Owner SHANGHAI UNIV
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