Seeking advice on corrosion in vacuum distillation towers
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This post was last edited by szx on 2018-1-5 at 16:02. The image shows a pressure relief tower; it is the manhole cover for Line 3. The material of the main structure is 16MnR, while the manhole cover’s composite plate is made of 304 material. Why was the composite plate made of 304 corroded and damaged, whereas the main structure made of 16MnR showed no signs of corrosion?
Is it corrosion of the sealing surface, or? What about your picture?
It’s clear that many people don’t know how to upload pictures, as they don’t post in advanced mode; posting directly in the reply window doesn’t allow pictures to be uploaded successfully. It is recommended to remove the images and links from the small reply subject window. @sea7000
Where are the photos? Didn’t the diagrams help you analyze much?
Sometimes it is due to potential corrosion of the material in the medium.
Well~~~Since Q345 is used as the anode of a battery, it should corrode quite quickly, right?~~~~~~
High-temperature sulfur corrosion, naphthenic acid corrosion
I’m speechless; I’ve spent days trying, but the images keep failing to be uploaded.
Is it local corrosion or pitting corrosion? If it is chloride corrosion, stainless steel and carbon steel may exhibit different appearances; the images will make this clearer