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I was just told this.
I had technical help on the phone as I was asking about chemical compatibility with various materials regarding 5 Star Acid #5 and in the conversation this statement was made. ".....phosphoric acid does not re-passivate SS it's the Nitric Acid that re-passivates...."
I mentioned that I was taking this info from Palmers Metallurgy appendice and was told that "...Palmer is making corrections...."
I have also read that Oxalic Acid (BKF) re-passivates and now I wonder if that is true or not.
I had technical help on the phone as I was asking about chemical compatibility with various materials regarding 5 Star Acid #5 and in the conversation this statement was made. ".....phosphoric acid does not re-passivate SS it's the Nitric Acid that re-passivates...."
I mentioned that I was taking this info from Palmers Metallurgy appendice and was told that "...Palmer is making corrections...."
I have also read that Oxalic Acid (BKF) re-passivates and now I wonder if that is true or not.