I’ve seen a number of videos recently of people restoring very rusted objects, like toys and an anceint historical knife, where the rust seems to have eaten most of the metal. However, after restoration, the object seems good as new and don’t seem to have lost any significant amount of mass even though you’d expect there to be nothing left. How is this even possible?
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One point to note, in many cases, rust can also become an external protective barrier that stops further oxidation and keeps the underlying steel protected. ‘Weathing Steel’ is a type engineered specifically to quickly form a solid, protective rust coating. Useful in external structures and gives quite an attractive red finish.
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