How to find the cause of severe corrosion on the inner wall of an autoclave.
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As the title suggests, a few days ago the manufacturer reported that the inner wall of the autoclave we produced was severely corroded. We sent people there and found that large pieces of metal were falling off the inner wall of the autoclave. Now they have brought back the pieces of material that were cut out from the weight box, as well as the bricks that haven’t been processed yet and those that have been processed, along with the condensate water. They want these samples to be analyzed. I would like to ask what should be done in this situation, where to start, what tests need to be conducted, and how to identify the cause. Additionally, it is certain that the material pieces cut out from the counterweight box are cylinder material; but does the fact that the material has been cut affect the testing results? Urgent!!! I need some expert advice, thank you so much! ! !
Attention should be paid to water quality; check its pH value...
I heard that the manufacturer conducted tests and found it to be highly alkaline; is this the main cause of this corrosion?
Please check the relevant materials, those on alkaline corrosion...
1. Is the steam nozzle installed backwards? Is the nozzle aligned directly with the inner wall of the container? What is the design flow velocity for the nozzle? Is the flow rate too high? ? Is the distance between the nozzle orifice and the inner wall too small? Causes severe erosion? 2. Is the steam under overpressure or overtemperature? Is the steam flow exceeding the design value? ? 3. Is there any issue with the container material? (Generally, there should be no problem.)
Personally, I think it's due to erosion and overheating. The reasons for erosion are: 1. Structural design issues; 2. Excessively high flow rates. Erosion is a likely cause, and there is generally no problem with the material itself
It mainly depends on the operating conditions; when designing containers for use by humans, these conditions need to be taken into account, such as exposure to acids, alkalis, hydrogen sulfide, etc. It is recommended to use cladding layers that are resistant to corrosion
What’s in the medium? Such heavy shedding must indicate severe corrosion
Alkaline media cause stress corrosion.