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Technical Frequently Asked Questions
"MIC Corrosion of 254 SMO"
Question:
"I
have an issue with 254 SMO corrosion in a hot water enviroment.
In two seperate applications we have seen MIC corrosion. both
applications a bleach plant washers using hot water filtrate
to was hpulp. one application contact an alklaine source and
the other an acid source. The alkaline source is much more aggressive
but there is also significant corrosion in the acid source. The
other wild card is a recycled water surce from paper machines
which contains starch and polymer. we believe we are seen anareobic
bacteria possibly sbr but are not sure. I need some help with
a new metal choice for the application. we are considering c276/c22
but have some concerns about the possibility of chlorine dioxide
contact with the metal. We have had inpedendent analysis of the
corrosion and it was confirmed as MIC - The problem is that the
washer is pressurized an one side of the washer contacts chlorine
dioxide and the other contacts the problem source. We do not
believe that MIC is affecting the ClO2 contacting side. Of note
is that we can find no refernces of MIC in 254 SMO"
Answer:
If your problem has been accurately disgnosed as MIC corrosion, their contribution may be related to concentrating chlorides and possibly affecting the breakdown potential. Hastelloy C-22 and C-276 should provide increased chloride pitting resistance, compared with 254 SMO; however, we would not guarentee their success, based on the available information regarding the environment.
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