Bonderizing is a chemical process to help prevent the corrosion of iron, steel, and other metals. You can also add a definition of Bonderizing yourself The process of treating a metal surface with a zinc phosphate coating in preparation for painting or. Bonderizing Process. Lubricating film for cold forging of aluminum-based metal. Our automatic processing line for aluminum-based metal has been in operation.

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Parkerizingbonderizingphosphatingor phosphatizing is a method of protecting a steel surface from corrosion and increasing its resistance to wear through the application of a chemical procdss conversion coating.

Parkerizing is usually considered to be an improved zinc or manganese phosphating process, bonferizing 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 bnderizing firearms as a more effective alternative to bluingwhich is an earlier-developed procesx conversion coating.

It is also used extensively on automobiles to protect unfinished metal parts from corrosion. The Parkerizing process cannot be used on non-ferrous metals such as aluminiumbrassor copper.

It similarly cannot be applied to steels containing a large amount of nickelor on stainless steel. Passivation can be used for protecting other metals.

The process involves submerging the metal part into a phosphoric acid solution whose key ingredient is often zinc or manganesewith varying additional amounts of nitrateschloratesand copper. A bnoderizing of small bubbles is emitted from the metal part as the process takes place; when the bubbling stops, the process is complete. In addition to this particular processing temperature, there have also been various similar Parkerizing processes developed and patented that permit using either lower temperatures for energy efficiency or higher temperatures for faster processing.

Zinc phosphating results in a non-reflective, light- to medium-gray finish. Manganese phosphating produces a medium- to dark-gray or black finish. Iron phosphating produces a black or dark gray finish similar to manganese phosphating. The grain size of the zinc phosphating is usually the smallest among the three processes, providing a more appealing cosmetic appearance in many applications. This was caused by contaminants in the acid solution and not cosmoline as is commonly believed.

Manganese and iron phosphating coatings are usually the thickest electrochemical conversion coatings, being thicker than electrochemical conversion coatings such as zinc phosphating and bluing. As for other chemical conversion coatings, the Parkerized surface must be completely covered with a light coating of oil to maximize corrosion and wear resistance, primarily through reducing wetting action and galvanic action.


A heavy lrocess coating is unnecessary and undesirable for achieving a positive grip on Parkerized metal parts. Alternatively, the Parkerized surface may be painted over with an epoxy or molybdenum finish for added wear resistance and self- lubricating properties. Development of the process was started in England and continued by the Parker family in the United States. The terms ParkerizingParkerizeand Parkerized are all technically registered U. The process was first used on a large scale in procexs manufacture of firearms for the United States military during World War II.

The earliest work on phosphating processes was developed by British inventors William Alexander Ross, British patentinand by Thomas Watts Coslett, British patentin Coslett, of Birmingham, Englandsubsequently filed a patent based on this same process in America inwhich was granted U. Patentin It bonderizlng provided an iron phosphating process, using phosphoric acid.

An improved patent application for manganese phosphating based in large part on this early British iron phosphating process was filed in the US inand issued in to Frank Rupert Granville Richards as U. Parker acquired the rights to Coslett’s and Richards’ U. The ultimate result was that Clark W.

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Parker, along with his son Wyman C. Colquhoun of the Parker Peocess Phosphating Company provess America then filed another improved phosphating patent application in This patent was issued in as U. Patent 1,for an improved manganese phosphating Parkerizing technique. This patent was issued as U. Patent 1, in Manganese phosphating, even with these process improvements, still required the use of expensive and difficult-to-obtain manganese compounds.

Subsequently, an alternative technique was developed by the Parker Company to use easier-to-obtain compounds at less expense through using zinc phosphating in place of manganese phosphating.

The patent for this zinc phosphating process using strategic compounds that would remain available in America during a war was granted to inventor Romig of the American Chemical Paint Company in as U. Patent 2,just prior to the loss of easy access to manganese compounds that occurred during World War II.

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Somewhat analogous to the improved manganese phosphating process improvements discovered by Baker and Dingman, a similarly improved method was found for an improved zinc phosphating process as well. Patent 2, bodnerizing, that improved upon the zinc phosphatizing Parkerizing process further.


With these process improvements, the end result was that a low-temperature energy-efficient zinc phosphating Parkerizing process, using strategic materials to which the United States had ready access, became the most common phosphating process used during World War II to protect American war materials such as firearms and planes from rust and corrosion.

After applying the Tenifer process, a black Parkerized finish is applied and the slide is protected even if the Parkerized finish were to wear off.

Used this way, Parkerizing is thus becoming a protective and decorative finishing technique that is used over other underlying improved techniques of metal protection. Traditional iron phosphate, zinc phosphate, and manganese phosphate chemical conversion coatings, including Parkerizing variations, have all been criticized [2] in recent years for introducing phosphates into surface water systems, encouraging the rapid growth of algae eutrophication.

As a result, in recent years, new, emerging technology alternatives to traditional phosphate coatings have started to see limited use, for replacing all phosphating coatings, including Parkerizing. The majority of these newer conversion coatings are fluorozirconium-based.

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procesd The most popular of these fluorozirconium-based conversion coatings, introduced inincorporates the transition metal vanadium. This new, more procrss friendly coating is referred to as a vanadate conversion coating. Besides vanadate coatings, arsenate coatings may theoretically provide boneerizing protection, at the risk of being a health hazard to humans and animals. It remains to be seen if these, or other new chemical conversion coatings, will ultimately replace traditional phosphating and Parkerizing.

Various if similar recipes for stovetop kitchen Parkerizing circulate in gun publications at times, and Parkerizing kits are sold by major gun-parts distributors such as Brownells. From Wikipedia, the free encyclopedia. This article is about the historical phosphating process. For modern phosphating, see Phosphate conversion coating. For the wine term, see Robert M.

Retrieved April 12, Environmental Protection Agency Recommendations. Retrieved from ” https: Coatings Corrosion prevention Metalworking. Views Read Edit View history. This page was last edited on 13 Augustat By using this site, proceds agree to the Terms of Use and Privacy Policy.

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