Flame Bluing

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Not much protection from this method. Flame coloring changes the structure of a very thin oxide layer to alter the refractive index of the material so that the light reflected is chromatically shifted. Conversion treatments like nitre bluing, rust bluing, or parkerizing can stave off rust, but still need oiling to complete the barrier. Plating is still the best for corrosion, but there's plenty of stainless available to us if you really want to defer maintenance as far as possible.
 
Not much protection from this method. Flame coloring changes the structure of a very thin oxide layer to alter the refractive index of the material so that the light reflected is chromatically shifted. Conversion treatments like nitre bluing, rust bluing, or parkerizing can stave off rust, but still need oiling to complete the barrier. Plating is still the best for corrosion, but there's plenty of stainless available to us if you really want to defer maintenance as far as possible.
I think my brain just imploded from your statement. :)
 
Not much protection from this method. Flame coloring changes the structure of a very thin oxide layer to alter the refractive index of the material so that the light reflected is chromatically shifted. Conversion treatments like nitre bluing, rust bluing, or parkerizing can stave off rust, but still need oiling to complete the barrier. Plating is still the best for corrosion, but there's plenty of stainless available to us if you really want to defer maintenance as far as possible.

Agreed, it's not for a submarine, but is better than standard stuff. I think it's pretty much the same as black oxide we get now?
 
Agreed, it's not for a submarine, but is better than standard stuff. I think it's pretty much the same as black oxide we get now?
No, black oxide is manganese-phosphate conversion, which binds up iron on the surface and provides a micro-porous layer that wicks in oil for protection. So black oxide falls into the conversion treatment category like parkerizing, but has a deep black color from the addition of manganese. Those bolts rust when we don't replace the oil film after washing or running in the dust. Even poopy oil like WD-40 is enough to protect if applied regularly.
 
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