Corrosion of stainless steel
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Today I removed a heat exchanger and found that it was severely corroded. The materials used were 304 and 316L; the corrosion inside took the form of spots in some areas and widespread corrosion in others. The material contained chloride ions – is there any way to reduce corrosion? Other methods such as electrostatic protection could be used; those with expertise in this area are requested to provide guidance. I understand the basic principle, which is to eliminate the chloride ions from the material, but due to process limitations, this method is practically unfeasible. Therefore, we have to resort to other approaches – I’m seeking specific suggestions.
316L won’t work; it’s better to try using duplex stainless steel.
SS316L might be fine, but 304 won’t work
Introduce the operating conditions and media of the heat exchanger, so that everyone might come up with some valuable ideas.
300 series stainless steel is not resistant to chloride ions.
I generally agree with the view expressed on floor 5; in other words, stainless steels of the 18-8 series have poor resistance to stress corrosion, as well as limited resistance to pitting corrosion, when exposed to chloride ions and under processing stresses.
I work in laboratory furniture, and sometimes I need to equip stainless steel laboratories with fume hoods as part of my job. According to foreign standards and information provided by manufacturers, fume hoods for perchloric acid should be made of 316 or 316L stainless steel; however, users claim that this material is not resistant to the corrosion caused by strong acid mists such as perchloric acid. I’m a bit puzzled by this – is it due to differences in materials between domestic and foreign sources, or rather different usage environments? I hope someone with more experience can give me some advice! If you have an answer, please message me or send it to my email gyl1725@163.com. Thank you!
AL2003 can be used here; please provide me with your email address so that I can send you the relevant information. Currently, Lan Shi and Lankē are the two companies that use AL2003 duplex steel to produce heat exchangers, with electrolytic aluminum and certain chlor-alkali industry materials being the main inputs used in this process
Austenitic stainless steel is quite sensitive to chloride ions, especially in the presence of acid.
The price of AL2003 is a bit higher than that of 316L, but much lower than that of 2205
Austenitic stainless steel won’t work; it’s better to use duplex stainless steel such as 2205
Dear students, the 300 series of austenitic stainless steels do not have ideal corrosion resistance to chloride ions. In environments with high chloride ion concentrations, even 316L can be corroded. It’s better to use duplex steel. When the chloride content in water is
Are there any successful application examples for duplex stainless steel?
Either change the material, as austenitic stainless steel will definitely develop CLSCC, or raise the pH value of the medium to above 10, as alkaline conditions are slightly better