Parkerizing, bonderizing, phosphating, or phosphatizing is a method of protecting a steel surface from corrosion and increasing its resistance to wear through the application of an electrochemical phosphate conversion coating. Parkerizing is usually considered to be an improved zinc or manganese phosphating process, and not to be an improved iron phosphating process, although some use the term parkerizing as a generic term for applying phosphating (or phosphatizing) coatings that does include the iron phosphating process.

Parkerizing is commonly used on firearms as a more effective alternative to bluing, which is another electrochemical conversion coating that was developed earlier. It's also used extensively on automobiles to protect unfinished metal parts from corrosion.

The Parkerizing process cannot be used on non-ferrous metals such as aluminum, brass, or copper. It similarly cannot be applied to steels containing a large amount of nickel, or on stainless steel. Passivation can be used for protecting other metals.

Read more about Parkerizing:  Application, Appearance and Use, Early History, Future

Other articles related to "parkerizing":

Science And Invention In Birmingham - 20th Century
1906 The earliest work on the parkerizing processes is developed by British inventors William Alexander Ross, in 1869, and by Thomas Watts Coslett, in 1906 ... Parkerizing (also called phosphating and phosphatizing) is a method of protecting a steel surface from corrosion and increasing its resistance to wear ... Parkerizing is commonly used on firearms ...
Parker Engineering - History
... mainly undertaking its design and manufacture in conjunction with Nihon Parkerizing Co. 1960 Became a subsidiary of Nihon Parkerizing Co ... Absorbed Nagoya factory of Nihon Parkerizing Co ...
Parkerizing - Future
... an Austrian firearms manufacturer, uses a black Parkerizing process as a topcoat to a Tenifer process to protect the slides of the pistols they manufacture ... Used this way, Parkerizing is thus becoming a protective and decorative finishing technique that is used over other underlying improved techniques of metal protection ... electrochemical conversion coatings, including Parkerizing variations, have all been criticized in recent years for introducing phosphates into surface ...