90 degrees Celsius, 10 wt% sulfuric acid – stainless steel material selection
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Dear experts, I would like to ask: at 90 degrees Celsius and with 10 wt% sulfuric acid, which type of stainless steel should be used for the reaction vessel? Is 316L okay? If that doesn’t work, are there any other recommendations? Costs need to be considered
In such cases, it is better to choose a reactor lined with enamel or glass-lined material, as the high temperatures make stainless steel less suitable due to its limited long-term durability. If there are also some chelating ions in the medium, the corrosion of stainless steel will be quite noticeable.
Enameled steel has excellent corrosion resistance under these operating conditions, so it is worth considering; its price should be lower than that of stainless steel
Thank you for the answer! If enamel is not considered, are there any other options?
Thank you for the answer! If enamel is not considered, are there any other options? I consulted a manufacturer, who said that 316L can withstand such conditions after passivation to form an oxide film on its surface. Is this reliable?
I’m not sure about other options; passivation of 316L definitely won’t work as the effect is not significant.
Don’t be deceived; in such medium operating conditions, any austenitic material needs to have an oxide film formed through passivation before it can be used. What he mentioned is either phosphating for corrosion protection, but phosphating for corrosion protection on 316L seems to be relatively rare; as for the actual corrosion resistance achieved after this process, it’s necessary to consult the manufacturer’s specific test samples
The most comprehensive in history! ! ! Equal corrosion diagrams and corrosion rates of various materials in sulfuric acid. https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1039675 (Source: Haichuan Network – Huahai Chuanliu) You can take a look at this article
The images provided on the 10th floor can be used as a reference