If this question refers to a ...

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If this question refers to a Deaerator used in a boiler feedwater system to remove dissolved gases, then YES - a corrosion threat exists and must be addressed.  Both micro and macro corrosion can occur depending upon the ionic species present in the feedwater.  The discussion of these corrosion threats is much to involved to be addressed in a message board.  I can refer you to various technical articles should you be interested in further reasearch.  Let me know via email at H2Odocnnj@gmail.com