Metal art as junk artwork
Scientists have been looking at the incorrect part of the issues in known rust proofing. To understand one metal is not necessarily to understand any other metal.
Images still think that their job is to convince the visitor of how cool the rustproofing cat is behind their rusty metal art idea. Contemporary artists can do it with wax oil sticks.
Junk metal artwork
Rusted scrap metal turning to lobola cow sculptures because there are more cows than unicorns in South Africa. Oxidation painting is always an artistic blunder, even for painters' oxide iron pigment, used by scrap metal cows.