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attacking mild steel and leaving nitronic 40 alone
2

attacking mild steel and leaving nitronic 40 alone

attacking mild steel and leaving nitronic 40 alone

(OP)
I am looking for a way to remove mild steel from a nitronic 40 piece.  The steel was used as a filler during a spraying process.  From what I can gather, HCL may be a suitable solution.  I have found that it should be less than 1% to not attack the notronic 40.  Will that be strong enought to aggressively attack the steel?

RE: attacking mild steel and leaving nitronic 40 alone

2
Try using an acid which passivates stainless and dissolves carbon steel like hot, dilute HNO3. 5-10% and over 50C.

RE: attacking mild steel and leaving nitronic 40 alone

(OP)
I ended up trying many things and, for my application, 33% Acetic acid above 80C worked the best.  Believe it or not.

RE: attacking mild steel and leaving nitronic 40 alone

That's very interesting that acetic could do the job. I appreciate the feedback.

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