Our racecar has many magnesium parts, injector, supercharger case, valve covers and manifold. The entire body was made of magnesium sheet.
We have done quite a bit of machining, drilling and tapping of these parts, and never had any issues. But, we did make sure that all shavings were disposed of properly, and were kept from any ignition sources.
It does corrode if left untreated. Most all of our parts were Dow 7 dipped for a coating. They looked nice....
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