It seems that people who have used the electrolytic rust removal process have found that it leaves the bluing intact. For example: Roy Seifert and c141b.
Adding “firearm” to the search noted above gets links with greater relevancy.
This article is specifically about *removing* the bluing. The author used vinegar to remove the bluing. He *thinks* (but does not know) that the bluing, Fe3O4 (magnetite), is converted to Fe2O3 (red rust). Note that the vinegar is acidic and the soda wash solution used in electrolytic rust removal is basic. He also states that bluing is done in a solution of KNO3 + NaOH which would be basic.
As part of this article on electrolytic rust removal, a description of the chemistry of is provided. The exact chemistry is evidently complex and not fully understood. However, it appears that the rust (Fe2O3) is converted to magnetite (Fe3O4) — bluing, as part of the process. This may partially explain why bluing is not damaged by the process.
December 6th, 2012 at 9:25 pm
Check out electrolytic rust removal — no abrasion and *only* removes rust. Sometimes with *no* metal loss and will remove the rust *inside* a pit.
http://lmgtfy.com/?q=electrolytic+rust+removal
Added thought: electrolytic rust removal might not be nice to the finish — it might totally remove it.
December 6th, 2012 at 10:50 pm
Thanks for linking to my blog. I appreciate it.
December 7th, 2012 at 1:52 pm
Bluing is a form of rust, so yea, electrolytic removal will undo bluing.
December 7th, 2012 at 2:51 pm
It seems that people who have used the electrolytic rust removal process have found that it leaves the bluing intact. For example: Roy Seifert and c141b.
Adding “firearm” to the search noted above gets links with greater relevancy.
This article is specifically about *removing* the bluing. The author used vinegar to remove the bluing. He *thinks* (but does not know) that the bluing, Fe3O4 (magnetite), is converted to Fe2O3 (red rust). Note that the vinegar is acidic and the soda wash solution used in electrolytic rust removal is basic. He also states that bluing is done in a solution of KNO3 + NaOH which would be basic.
As part of this article on electrolytic rust removal, a description of the chemistry of is provided. The exact chemistry is evidently complex and not fully understood. However, it appears that the rust (Fe2O3) is converted to magnetite (Fe3O4) — bluing, as part of the process. This may partially explain why bluing is not damaged by the process.