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Что (кто) такое quench acetylene - определение
![Acetylene factory with annual capacity of 90,000 tons, commissioned in 2020 by [[BASF]].](https://commons.wikimedia.org/wiki/Special:FilePath/BASF Nsw.jpg?width=200 "Acetylene factory with annual capacity of 90,000 tons, commissioned in 2020 by [[BASF]].")
![Acetylene fuel container/burner as used in the island of [[Bali]]](https://commons.wikimedia.org/wiki/Special:FilePath/Laskarbit.jpg?width=200 "Acetylene fuel container/burner as used in the island of [[Bali]]")
Acetylene (systematic name: ethyne) is the chemical compound with the formula C2H2 and structure H−C≡C−H. It is a hydrocarbon and the simplest alkyne. This colorless gas is widely used as a fuel and a chemical building block. It is unstable in its pure form and thus is usually handled as a solution. Pure acetylene is odorless, but commercial grades usually have a marked odor due to impurities such as divinyl sulfide and phosphine.
As an alkyne, acetylene is unsaturated because its two carbon atoms are bonded together in a triple bond. The carbon–carbon triple bond places all four atoms in the same straight line, with CCH bond angles of 180°.
.png?width=200 "grey = W, yellow = sulfur, red = O, blue = N. The octahedral active site of the tungstoenzyme coordinated by two molybdopterin co-factors, Cys141 and a water molecule. The active site residues are Asp13 and Cys12.")
Википедия
Quench polish quench (QPQ) is a specialized type of nitrocarburizing case hardening that increases corrosion resistance. It is sometimes known by the brand name of Tufftride, Tenifer or Melonite. Three steps are involved: nitrocarburize ("quench"), polish, and post-oxidize ("quench").
This process is often used when two or more of the following properties are required in a workpiece:
- wear resistance
- corrosion resistance
- lubricity
- fatigue strength
Common applications of the process are for piston rods of shock absorbers, cylinders and rods for hydraulic systems, pumps, axles, spindles, firearm slides and barrels and valves.
