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NO - there is no hydrogen embrittlement with black oxide...unlike plated and painted parts that are acid etched.
Up to 144 hours - depending on the oil that is used and process parameters.
Virtually Zero - because the surface is converted (not coated). No more than 5 to 10 millionths of an inch are added to the dimension of a part, which is comparable to the depth of penetration. Unlike painted of plated surfaces, this process provides corrosion resistance for critical sized parts. Is that cool or what?
YES - and it does not produce caustic fumes. Unlike paint and plating, black oxide does not produce harmful fumes when welding.
MAGNETITE (Magnet) - The Black Oxide finish is a result of the surface being converted (does not add to it) into Magnetite (Fe3O4). It is formed by a chemical reaction produced when the part's iron ferrous alloy surface is immersed in an alkaline aqueous salt solution bath.
YES - Black oxide coating is suitable for electrical parts as they do not reduce conductivity more than 1%.