Never heard of such a thing but probably not since they were created by the ancient ones to be immortal warriors, making their body rust would exactly be the smartest thing when you want immortal machine like warriors. For a fluff created army, am sure it be possible with an ancient virus or something, not sure am not a Necron expert but it's not that far out like people wanting Female Adeptus Astartes.
"I am Honored to call every single one of you my brother.....You will die today, I will die today but if we must die for the greater good of humanity so be it. With our deaths, our children will blossom into the stars with the Primarches of anew and start a new, grander crusade in the name of the Emperor and as the Emperor's chosen, we will guide them to that path......Show them the true fury of the Emperor's wraith one last time my brothers!.....Forward in the name of the Emperor and may you find salvation with the Emperor when the end comes for you.
- Chapter Master Nilus Pentis of the Ultra Hawks,
00.? 42M, Second battle of Terra