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A method for monitoring atmospheric corrosion of metal components

A metal component and atmospheric corrosion technology, applied in weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problem of inappropriate on-site monitoring, the inability to make accurate judgments on the corrosion status of metal components, and the inability to directly obtain the corrosion rate of metal components and corrosion process information to achieve the effect of ensuring uniformity and improving sensitivity

Active Publication Date: 2021-07-09
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current monitored by the atmospheric corrosion detector is the corrosion current and corrosion potential of the galvanic corrosion monitoring sensor composed of dissimilar materials in the atmosphere. Corrosion rate and corrosion behavior of the component itself
The Kelvin probe is not suitable for on-site monitoring due to its harsh detection conditions.
[0007] To sum up, in the prior art, the online corrosion monitoring in the atmospheric environment has problems such as the inability to directly obtain the corrosion rate and corrosion process information of the metal component itself, especially the inability to make an accurate judgment on the corrosion status of the metal component, given Security warning

Method used

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  • A method for monitoring atmospheric corrosion of metal components
  • A method for monitoring atmospheric corrosion of metal components
  • A method for monitoring atmospheric corrosion of metal components

Examples

Experimental program
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Effect test

Embodiment 1

[0126] The inventor chooses a rectangular zinc plate and puts it in an atmospheric environment corrosion test box for corrosion monitoring. The temperature in the atmospheric environment corrosion test box is set to be 26° C., and the humidity program of the test box is set to 80% for 4 hours, 60% 4 hours, 30% 4 hours, the test time is 15 days;

[0127] The size of the selected zinc plate is: 200mm×50mm×2mm. First, use 400# metallographic sandpaper to slightly polish the surface of the zinc plate to remove burrs and protrusions;

[0128] Then use 10μm double-sided adhesive to attach the temperature sensor, humidity sensor and corrosion monitoring sensor to the zinc plate, and use special tools to roll and press the sensor to ensure that the sensor is closely attached to the zinc plate;

[0129] Then connect the six groups of conductive wires on the corrosion monitoring equipment to the corresponding sensors for corrosion monitoring;

[0130] A temperature sensor and a humidit...

Embodiment 2

[0137] The inventor selected the connecting plate near the foot of the galvanized steel tower in a certain 220kV substation for corrosion monitoring.

[0138] First, use 400# metallographic sandpaper to slightly polish the galvanized layer on the surface of the connected board at the monitored part to remove burrs and protrusions. Then use 10μm double-sided adhesive to stick the sensor to the monitored part of the joint plate, and use special tools to press the sensor to ensure that the sensor and the component are closely attached;

[0139] Then connect the six sets of conductive wires on the corrosion monitoring equipment to the corresponding sensors, turn on the corrosion monitoring equipment, first monitor the temperature and humidity of the atmospheric environment, and start the linear polarization curve test when the humidity of the atmospheric environment is greater than or equal to 40%. The applied potential of the linear polarization curve test is ±10mV, and the measu...

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Abstract

The invention provides a method for monitoring atmospheric corrosion of metal components. The monitoring shape of the metal component to be monitored is circular, and the current electrode adopts a circular arc shape, which can ensure the uniformity of corrosion current; the metal sheet is used as a voltage electrode to reduce chloride ion pairing. The pollution of the electrode system; there is a gap between the current electrode and the monitored metal component, the voltage electrode and the monitored metal component, and there is no contact or conduction, but the distance is as close as possible, which improves the monitoring sensitivity and ensures that it is thin in the atmosphere. It is easy to form a measurement system under the liquid film; the corrosion monitoring sensor can be directly attached to the surface of the monitored metal component, regardless of the shape of the component, and can continuously monitor and obtain the instantaneous corrosion rate and cumulative corrosion amount of the metal component, which can not only be used for engineering material selection and anti-corrosion The design provides data support, and can also give safety warnings to metal components in operation to ensure the safe operation of the power system.

Description

technical field [0001] The invention relates to the technical field of atmospheric corrosion monitoring, in particular to a method for monitoring atmospheric corrosion of metal components. Background technique [0002] The corrosion phenomenon of metals under natural atmospheric conditions is called atmospheric corrosion. Atmospheric corrosion mainly includes two parts: the oxidation of air and the electrochemical corrosion caused by the conduction of a thin liquid film on the metal surface. Among them, the electrochemical corrosion accounts for more than 90% of the weight of the total corrosion. Metal surfaces generally absorb water films of varying thicknesses in the atmospheric environment, and corrosive media such as oxygen dissolve in the water film to make them conductive, and the electrons released by metal oxidation are received by the corrosive media to complete the electrochemical corrosion process. [0003] Engineering equipment and components exposed to the natu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 闫风洁李辛庚姜波樊志彬王晓明郭凯李文静张振岳王蝶吴亚平米春旭宗立君赵洺哲高智悦
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY