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freebeard · 03-27-2015, 01:18 PM

Orange rust is microscopically thin and bound to the surface like the oxide that forms on aluminum. It's commonly called 'patina'. As it gets darker, it's eating the substrate and if it doesn't spall, when you remove it the part has lost mass.

03-27-2015, 01:18 PM	#58 (permalink)
freebeard Master EcoModder Join Date: Aug 2012 Location: northwest of normal Posts: 28,721 Thanks: 8,152 Thanked 8,935 Times in 7,377 Posts	Orange rust is microscopically thin and bound to the surface like the oxide that forms on aluminum. It's commonly called 'patina'. As it gets darker, it's eating the substrate and if it doesn't spall, when you remove it the part has lost mass.