Quench polish quench (QPQ) is a specialized type of nitrocarburizing case hardening that increases corrosion resistance, originally developed by the Kolene Company. The name refers to the three steps involved: nitrocarburizing, polishing, and post-oxidizing.
This process is usually used when two or more of the following properties are required in a workpiece: wear resistance, corrosion resistance, lubricity, or fatigue strength. However, it is also used when superior corrosion resistance is required. Common applications are piston rods for shock absorbers, cylinders and rods for hydraulic systems, pumps, axles, spindles, and valves.
Read more about Quench Polish Quench: Process, Corrosion Resistance
Famous quotes containing the words quench and/or polish:
“If in that Syrian garden, ages slain,
You sleep, and know not you are dead in vain,
Nor even in dreams behold how dark and bright
Ascends in smoke and fire by day and night
The hate you died to quench and could but fan,
Sleep well and see no morning, son of man.”
—A.E. (Alfred Edward)
“It has always been my practice to cast a long paragraph in a single mould, to try it by my ear, to deposit it in my memory, but to suspend the action of the pen till I had given the last polish to my work.”
—Edward Gibbon (1737–1794)