Mg alloys, esp. the older alloys, will corrode just from fog in the air. A friend had a sports car part made of Mg "rust" while sitting on a shelf in his garage.
You want to inspect periodically and you definitely should treat that "white powdery former metal."
looking into the properties/limitations of Scandium
i have enough contacts at big B to get some though very limited cooperation. just was playing with a 787-9 today. i haven't been out there lately but there is Boeing Surplus online and the store in Kent. used to have some fun stuff.
