How to quickly determine the corrosion of the cooler
Source: http://le-signal.com/ Time: 2017-07-20
After using the cooler for a period of time, we will find spots on its surface. In fact, this means that the cooler has been corroded. This is just a very common phenomenon. A series of phenomena such as indirect corrosion and uniform corrosion occur.
Pilot corrosion of cooler:
It means that the metal surfaces such as stainless steel plates are rusted or scaled, which results in poor thermal conduction and reduced pH value of the medium, which results in the destruction of the passivation film on the local metal surface and local corrosion. Occluded battery corrosion generally manifests as perforations or pits of less than 1 mm.
Cooler crevice corrosion:
A spot-like or ulcer-like local corrosion caused by occluded battery corrosion, but this corrosion mainly occurs in the gaps of metal parts, so it is called gap corrosion. This corrosion is mainly due to the retention of the medium Caused by electrochemical heterogeneity.
Cooler stress corrosion cracking:
Products such as plates of the cooler will produce residual internal stress during the production process. Under the combined action of static tensile stress and electrochemical media such as halogen ions, the local corrosion cracking or fracture of the metal caused by the dissolution of the cathode.
Cooler intergranular corrosion:
It is due to the corrosion of the metal surface and deep inside along the grain boundaries. For example, stainless steel will corrode if it is in the temperature range of 400 ℃ -600 ℃. This corrosion will cause the bonding force between the grains to be lost, and the strength of the material. Greatly reduced.
Cooler uniform corrosion:
The material selection of the cooler plate is improper or the use time is too long, exceeding its service life, most or all of the metal surfaces that can contact the medium will be corroded. This is uniform corrosion. In order to avoid this kind of corrosion, the cooler material is selected. Properly, the service life is exceeded and must be replaced in time.
As soon as the cooler is found to be corroded, it has reminded us that the product function has started to decline, and we must pay attention to safety when using it. I hope everyone can remember the above phenomena, so that you can quickly judge, so that you can better maintain the cooler.
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