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Rust bluing is also used on shotgun barrels that are soldered to the rib between the barrels, as hot bluing solutions melt the solder during the bluing process. Large scale industrial hot bluing is often performed using a bluing furnace. This is an alternative method for creating the black oxide coating.
These tanks contain, in order, alkaline detergent, water, sodium hydroxide at 140.5 °C (284.9 °F) (the blackening compound), and finally the sealant, which is usually oil. The NaOH (caustic soda) and elevated temperature cause Fe 3 O 4 (black oxide) to form on the surface of the metal instead of Fe 2 O 3 (red oxide; rust). While it is ...
Hot bluing is extremely sensitive to certain impurities, and to properly cleaning the metal of all oil residue prior to attempting to blue it. If some specific impurities are present, or if all oil is not carefully removed, then the hot bluing always fails. If an adequate amount of water is not present, then the bluing fails, too.
Chemical coloring of metals is the process of changing the color of metal surfaces with different chemical solutions. The chemical coloring of metals can be split into three types: electroplating – coating the metal surface with another metal using electrolysis. patination – chemically reacting the metal surface to form a colored oxide or ...
A conversion coating is a chemical or electro-chemical treatment applied to manufactured parts that superficially converts the material into a thin adhering coating of an insoluble compound.
Before you cozy up on the couch with a mug of your favorite hot chocolate, you might want to consider Consumer Report's latest list of powder mixes that contain high levels of metal.