How does such corrosion occur? I’m seeking help from everyone!
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Actually, I saw this in another post; I’ve encountered something similar at work as well! http://bbs.hcbbs.com/forum.php?mod=attachment&aid=ODUwODYwfDkwNzM2ZThifDEzMzE2NDY4NDV8MjgyMjQ5fDk2NzU0NA%3D%3D&noupdate=yes http://bbs.hcbbs.com/forum.php?mod=attachment&aid=ODUwODYxfDMwYmRhZGYyfDEzMzE2NDY4NDV8MjgyMjQ5fDk2NzU0NA%3D%3D&noupdate=yes Since I’m not involved in this field, I’m still curious as to whether this is caused by corrosion; it seems to be similar to the ulceration or pore corrosion described in books! These are bean-sized spots that appear on the cylinder of the urea synthesis tower; since there are no internal photos, only these surface photos are available! In my previous work, on a waste alkali tank made of carbon steel, something similar would occur; after a short while, a liquid would start to flow out from those spots. Finally, a different material was used.
Are they pushed up by internal bubbles? Guess. I seem to have read in some materials that the entry of gas into the metal can cause related effects.
The possibility of hydrogen blistering (a type of hydrogen corrosion) is 80%. What material are you using? It is recommended to choose materials resistant to hydrogen corrosion. Provide the material you are using so that a further assessment can be made.
It’s clearly a hydrogen blister; what is the temperature? At temperatures between 260 and 290 degrees, carbon-molybdenum steel combined with 0Cr13 composite steel plates can be used
This post was last edited by clarkzq on 2012-3-15 10:27. Urinal lining, 316Lmod – this is the only section that has it; the others do not. How does hydrogen corrosion occur? Hydrogen bulging. Definition: Hydrogen atoms diffuse into the interior of the metal (mostly through the wall), where they combine to form hydrogen molecules that then escape. If hydrogen atoms diffuse into the voids in steel and combine there to form hydrogen molecules, and since these hydrogen molecules cannot diffuse, they accumulate and create high internal pressures, leading to bulging or even cracking of the steel surface—a phenomenon known as hydrogen embrittlement. Low-strength steels, especially those containing a large amount of non-metallic inclusions, are most prone to hydrogen blistering. Corrosion environments that cause hydrogen bulging: The medium usually contains toxins such as hydrogen sulfide, arsenic compounds, cyanides, or phosphorus ions. These media prevent the hydrogen evolution reaction. Has hydrogen sulfide gas gotten inside? How did they get in? There’s only one section after all