Talk:Red fuming nitric acid

HF as a corrosion inhibitor?

I was a little taken aback reading in the Experiments section that HF is added as a corrosion inhibitor. One of the few factoids I thought I knew about chemistry was that hydrofluoric acid is itself extremely corrosive. I don't doubt the article, but maybe one of you experts can add a few words of explanation on how the HF has a corrosion inhibiting effect. --Chetvorno^TALK 10:15, 30 May 2014 (UTC)

Fluoride, being an anion with a dense charge, might be expected to bind tightly to certain metals. The situation would be analogous to passivation of metals (Al, Si) by strongly adhering oxides. Here is a quote from a technical source "Carbon steel is commonly used with liquid or gaseous anhydrous hydrofluoric acid up to 100 – 150 C. Carbon steel is passivated by the formation of a layer of iron(III) fluoride." See Aigueperse, Jean (2005), "Fluorine Compounds, Inorganic", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a11_307 {{citation}}: Unknown parameter |coauthors= ignored (|author= suggested) (help).--Smokefoot (talk) 15:32, 30 May 2014 (UTC)

Ah, I see. That makes sense. Thank you, sir. --Chetvorno^TALK 20:46, 30 May 2014 (UTC)

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No reason for a separate article

I see no reason to have a separate article for this particular grade of nitric acid. The contents should be merged back into the corresponding section of nitric acid, and some details could be trimmed or factored out. For example, the details of the resistance of metals to corrosion is too technical for Wikipedia. --Jorge Stolfi (talk) 17:03, 18 February 2019 (UTC)

• It would help a lot if you trailed a centralised discussion here (At Talk:Nitric acid?) rather than repeating it in isolation everywhere. How many of these did you post? Andy Dingley (talk) 18:21, 18 February 2019 (UTC)

• My fault. I did suggest the merge also on Talk:Nitric acid, but forgot to say that here. --Jorge Stolfi (talk) 01:23, 19 February 2019 (UTC)