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Niter and colour case. In the nitre bluing process, polished and cleaned steel parts are immersed in a bath of molten salts—typically potassium nitrate and sodium nitrate (sometimes with 9.4 grams (0.33 oz) of manganese dioxide per pound of total nitrate). The mixture is heated to 310 to 321 °C (590 to 610 °F) and the parts are suspended in ...
The blacking process creates a layer about 1 μm thick. It is far cheaper than similar corrosion protection systems, such as paint and electroplating . The oldest and most widely used specification for hot black oxide is MIL-DTL-13924, which covers four classes of processes for different substrates.
Niter or nitre [5] is the mineral form of potassium nitrate, KNO 3.It is a soft, white, highly soluble mineral found primarily in arid climates or cave deposits. Historically, the term niter was not well differentiated from natron, both of which have been very vaguely defined but generally refer to compounds of sodium or potassium joined with carbonate or nitrate ions.
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 nitre bed is a similar process used to produce nitrate from excrement. Unlike the leaching-based process of the nitrary, however, one mixes the excrements with soil and waits for soil microbes to convert amino-nitrogen into nitrates by nitrification. The nitrates are extracted from soil with water and then purified into saltpeter by adding ...
A 15-year-old girl opened fire inside the Christian school she attended in Madison, Wisconsin, on Monday, killing a teacher and a student and wounding six others. The suspect, Natalie Rupnow, is ...
Bluing (steel) is a passivation process in which steel is partially protected against rust Bluing may also refer to: Bluing (fabric), a blue dye used to improve the appearance of fabrics; Bluing (hair), a blue dye used to improve the appearance of hair "bluing" of machine parts to check for tolerances, see engineer's blue
Neither of these are bluing (even a blue oil finish). Bluing is a chemical change to the surface, brought about by supplying more than just oxygen. Andy Dingley 20:13, 5 May 2011 (UTC) Browning (steel) redirects here, by the way. Huw Powell 03:24, 1 August 2012 (UTC)