Method and device for monitoring corrosion state of stainless steel in aqueous medium

A corrosion state and monitoring device technology, applied in measuring devices, weather resistance/light resistance/corrosion resistance, instruments, etc., can solve problems such as high system stability requirements, natural potential fluctuation errors, etc., to achieve clear criteria and reduce disturbances effect, the effect of low polarization

Active Publication Date: 2022-07-29
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the laboratory, it is also necessary to simulate the long-term immersion test of the field environment to judge the corrosion resistance of stainless steel materials, or the corrosion of the water medium. In the long-term immersion test, it is also necessary to monitor and judge whether the stainless steel is corroded, but there is no immediate Reliable and convenient real-time in-situ monitoring and discrimination method
The most promising method is to use electrochemical methods. Although electrochemical impedance spectroscopy (EIS) and electrochemical noise (EN) have been used to characterize whether pitting corrosion has occurred, the requirements for instruments using EIS and EN are high, and it is inevitable that there will be some problems. Interference of various electromagnetic fields, EN is particularly sensitive to external interference, EIS has high requirements on the stability of the system, and natural potential fluctuations will cause large errors

Method used

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  • Method and device for monitoring corrosion state of stainless steel in aqueous medium
  • Method and device for monitoring corrosion state of stainless steel in aqueous medium
  • Method and device for monitoring corrosion state of stainless steel in aqueous medium

Examples

Experimental program
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Effect test

Embodiment 1

[0039] like image 3 As shown in the figure, the stainless steel corrosion state monitoring device in the water medium of this embodiment includes: a computer 1, which can detect the natural potential E of the working electrode in the three-electrode system 0 and polarization resistance R p 2, a three-electrode system (a system composed of a working electrode 4, a counter electrode 6 and a reference electrode 3), and a test container 8 containing an aqueous medium 7. The test container 8 and the spacer 5 are set in the water bath 9 , and the test container 8 is set on the spacer 5 . The auxiliary device, the water bath 9 and the spacer 5, is optional according to actual needs. The electrochemical detection instrument 2 is connected to the computer 1 . The computer 1 may also be built in the electrochemical detection instrument 2 .

[0040] The materials of the working electrode and the counter electrode of the three-electrode system are made of the same stainless steel as ...

Embodiment 2

[0052] like figure 1 As shown, the stainless steel corrosion state monitoring device in the water medium of this embodiment is mainly used for monitoring equipment in non-laboratory. The stainless steel corrosion state monitoring device in the water medium includes: a computer 1, a monitoring probe 3 including a three-electrode system, which can detect the natural potential E of the working electrode in the three-electrode system 0 and polarization resistance R p 2; stainless steel equipment 4 (such as stainless steel heat exchangers, condensers, containers, etc.). The electrochemical detection instrument 2 is connected to the computer 1 . The computer 1 may also be built in the electrochemical detection instrument 2 . The three-electrode system is a system composed of a working electrode, a counter electrode and a reference electrode. The monitoring probe 3 is a combination of the working electrode, the counter electrode and the reference electrode. The head of the monitor...

Embodiment 3

[0055] like figure 2 As shown in the figure, the stainless steel corrosion state monitoring device in the water medium of this embodiment includes: a computer 1, which can detect the natural potential E of the working electrode in the three-electrode system 0 and polarization resistance R p The electrochemical detection instrument 2, a three-electrode system (a system composed of a working electrode 4, a counter electrode 6 and a reference electrode 3), a test container (beaker) 8 containing an aqueous medium 7 and an intermediate converter 10 . The electrochemical detection instrument 2 is connected to the computer 1 . The computer 1 may also be built in the electrochemical detection instrument 2 . The test container 8 and the spacer block 5 are set in the water bath 9 , and the test container 8 is set on the spacer block 5 . The auxiliary device, the water bath 9 and the spacer 5, is optional according to actual needs. The materials of the working electrode 4 and the c...

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Abstract

The invention provides a method and device for monitoring the corrosion state of stainless steel in an aqueous medium. The specific steps of the method for monitoring the corrosion state of stainless steel in an aqueous medium include: inserting a three-electrode system or a monitoring probe into a detected stainless steel device containing an aqueous medium or a test container containing an aqueous medium, and measuring the natural potential and polarization resistance. , and compare each group of measured natural potential and polarization resistance with the set criteria of natural potential and polarization resistance to determine its corrosion state. The monitoring method and device of the invention are reliable and convenient.

Description

technical field [0001] The invention relates to a method and a device for monitoring the corrosion state of stainless steel in an aqueous medium. Background technique [0002] Stainless steel has been widely used in all walks of life. Many stainless steel devices are in contact with aqueous media. Stainless steel may be in a passive state without corrosion in aqueous media, or local corrosion may occur, such as pitting corrosion, crevice corrosion, and sometimes activation. The state (active dissolved state) or the overpassivation state, the activated state and the overpassivation state also belong to the corrosion state, which is basically a general corrosion. Most of the corrosion of stainless steel in aqueous media is localized corrosion, and localized corrosion perforation may have catastrophic consequences. [0003] The monitoring of the corrosion state of stainless steel in water media can provide early warning for corrosion prevention and control of stainless steel e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/02G01N17/00
CPCG01N17/02G01N17/006
Inventor 梁磊赵阳
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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