Specific corrosion resistance of 2205 duplex steel
Thread Content
Recently, a batch of saturated steam from the manufacturer’s scrubber tower has reached our company; this steam contains sulfate ions, chloride ions, and hypochlorite ions, in low concentrations. The temperature of this steam is around 40 degrees Celsius. We would like to know whether 2205 duplex steel can resist corrosion caused by these ions, and whether there are any data available regarding the corrosion resistance of 2205 duplex steel
It’s impossible to tolerate this condition; anti-corrosion treatment is necessary. I can recommend using Teflon for anti-corrosion spraying
High-performance anti-corrosion coatings can be used to provide protection and assurance!
If Teflon can be used for corrosion protection, can it be sprayed on as a coating?
2205 is mainly resistant to stress corrosion
Yes, because Teflon contains fluorine and offers excellent corrosion resistance; 2205 and 2507 will develop pitting as soon as they are exposed to chloride ions. Your material is quite complex.
Duplex stainless steel exhibits good resistance to stress corrosion under conditions of chloride and hydrogen sulfide. The temperature and concentration levels mentioned by the original poster are not high, so there should be no problem.
So then, what about in salt acid? Can these two materials withstand it?
The corrosion rate is related to the concentration of salt and acid; both of these materials will experience corrosion over time. Suggestion: The equipment definitely needs to be protected against corrosion.
In saline acids, it is recommended to use chemical equipment made of graphite, such as graphite heat exchangers, graphite reactors, graphite falling film absorbers, graphite distillation columns, graphite concentrators, graphite synthesis furnaces, etc. Chemical equipment made of graphite can be used for extended periods under boiling conditions at any concentration of saline acids without experiencing any corrosion.