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The iron oxide particles remain suspended in the water, but when the water evaporates, the particles remain, forming a reddish coating on the surface of the iron. Without the presence of water, objects cannot rust. Other metals besides iron and steel can rust when exposed to moisture, but not all rust is ârust-colored.â For instance, when copper or bronze rusts, it turns green. The green crust is called a patina.
A. Actually brass doesn't rust, Caren :-). Iron is an element (Fe). And rust is defined as the iron oxide corrosion products of the corrosion of iron. So if something does not contain iron (Fe), it cannot produce iron oxide, so it cannot rust.Steel is iron-based and it rusts; the rest don't.That does not mean the other metals can't tarnish or corrode, though.In fact, all metals except precious metals like gold and platinum corrode to some degree. It's just that it's not called rust. If you scratch the lead you will see that it stays bright only for a little while and then tarnishes. chose copper, lead, steel, aluminum, zinc, iron, and brass. I pretty sure that 4 of those don't rust (copper, lead, aluminum, and zinc) and 2 do (iron and steel) but I'm not sure if brass does.