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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: 28,545 Thanks: 8,087 Thanked 8,880 Times in 7,328 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.