The difference is sample size for verification testing. This specification covers the different types of passivation treatments as well as recommendations, guidance and precautions for cleaning and descaling corrosionresistent parts, components, equipment and systems. General plating provides services in metal plating and has the capabilities for plating of 17 finishes and specs. Aisi 400c is available in either standard melted ams 5630 or vacuum melted ams 5618 versions. Ams 2700 method 2 citric passivation ams 2700 supersedes ams qqp35 and qqp35c, but we still offer certification to the superseded specifications qqp35 type i, type ii, type iii, type iv and type vi. Advance surface technologies provides both nitric and citric passivation treatments on titanium and stainless steel alloys that adhere to qqp35c, amsqqp35a, ams 2700c, astm a 96705 and astm a 38006 standards. Passivation is the chemical treatment of a stainless steel with a mild oxidant, such as a nitric or citric acid solution, for the purpose of the removal of free iron or other foreign matter. B type ii passivation is designed for use with 400 series stainless, screws machining grades 303, 303se, 347se. Passivation treatments for corrosionresistant steel ss by astma967 or sae ams qq p 35 scope. The ams 2700 passivation specification pertains to metal passivation services like those performed at able electropolishing.
The nitric acid passivation processes was the original passivation processed specified in qq p 35, the first military specification covering passivation, revision a being released in the 1960s. It was replaced by amsqqp35, an industry adoption of the original fed spec, and astmf967. After testing, speciments shall show no signs of rust or corrosion. Looking to the reference specs, it seems aerospace applications.
The final revision qqp35c and the cancellation notices are available from the us defense logistics agency assist quick search website. Specifically, this standard refers to the requirements for removing surface contaminants like free iron from the surface of corrosionresistant steel parts. After a time, the amsqqp35 was retired and replaced by the widelyused ams2700. When comparing nitric vs citric passivation, the most common method used throughout industry is nitric acid passivation. Sae amsqqp35 complete document revision a, february 5.
For example, drawings that list qq p 35 passivation require the use of nitric acid and, in some cases, hexavalent chromium containing baths. For example, drawings that list qqp35 passivation require the use of nitric acid and, in some cases, hexavalent chromium containing baths. You may also see mention of ams qq p 35, which was a stopgap document used by sae. Passivation qq p 35 passivation treatments for corrosion resistant steel ams 2700 passivation of corrosion resistant steel m agellan aerospace processing,newyork, 165field st. Originally, the amsqqp35 was just a reprint of the qqp35c. Citric acid is not an allowed substitution when qq p 35 is called for. To find similar documents by federal supply class code. Jun 03, 2009 except, replacement for qq p 35 is ams 2700 and not astm a 967. Passivation alone will not remove heavy adherent oxide films created from heat treatment, welding.
Louis, missouri, usa ams qq p 35 which replaced federal specification qq p 35 is an sae standard used in the aerospace industry to passivate stainless steel parts. Amsqqp35 type superseding ams 2700 type ii 2 vi 6 vii 7 viii 8 not specified use type appropriate for alloy, subject to. Ams2700 has a class 4 which is supposed to be used when qq p 35 or ams qq p 35 are specified. Louis, missouri, usa amsqqp35 which replaced federal specification qqp35 is an sae standard used in the aerospace industry to. Ams 2700 passivation standard able electropolishing. Removing these contaminants improves corrosion resistance and. Ams qq p 35 itself was canceled and superseded in february 2005 by ams 2700. Passivation treatments for corrosionresistant steel ss by astma967 or saeamsqqp35 scope. Revision c from 1988 was withdrawn by cancellation notice 3 on 9111998. This specification covers the different types of passivation treatments as well as recommendations, guidance and precautions for cleaning and descaling corrosionresistant parts, components, equipment and systems. Passivation qqp35 astma967 saeamsqqp35ams 2700 phosphate manganese mildtl16232 type m phosphate zinc mildtl16232 type z phosphate light zinc ttc490 silver qqs365 astmb700 zinc qqz325 astmb633 zinc cobalt alloy astmb840 zinc. The following specs refer to qqp35 for passivation of stainless steel and therefore allow the use of astm a967 and ams 2700. Qq p 35 was superseded by ams qq p 35 for aerospace products and ams qq p 35 was cancelled and superseded by ams2700. Passivation treatments for corrosionresistant steel.
Passivate clear passivate qqp35 type ii, vi, vii amsqqp35 types ii, vi, vii, viii astm a 96705 astm a380 codes f thru m 5. Passivation of aerospace stainless steel parts with citric. Many of the qq series of federal specifications are withdrawn now, and qqp35 is no exception. Astm a967 citric 1, citric 2, nitric 1 and nitric 2. Revision e of amsqqp416 corrects the errors in table 1a and removes the 24 hours minimum from the drying time requirement of 3.
Passivation qqp35 passivation treatments for corrosion resistant steel ams 2700 passivation of corrosion resistant steel m agellan aerospace processing,newyork, 165field st. Whatever happened to qqp35, passivation treatments for. The cancellation of qq p 35 assigns the use of astm a967 or ams 2700 for all dod related activities that list qq p 35 for use. Advance surface technologies provides both nitric and citric passivation treatments on titanium and stainless steel alloys that adhere to qq p 35c, ams qq p 35a, ams 2700c, astm a 96705 and astm a 38006 standards. The processes defined in this specification have been used typically. This document comes with our free notification service, good for the life of the document. The cancellation of qqp35 assigns the use of astm a967 or ams 2700 for all dod related activities that list qqp35 for use. The superseding specification, ams 2700, permits the use of citric acid baths in addition to the baths specified in qq p 35. This specification covers the requirements for a process to assure removal of free iron or other less noble contaminants from the surfaces of corrosion resistant steel parts. Passivation of stainless steel astm a967, qqp35, ams 2700.
Revision a actually just issued the cancellation notice, replacing this specification with the ams2700 document. Developments in citric acid passivation of stainless steel. The superseding specification, ams 2700, permits the use of citric acid baths in addition to the baths specified in qqp35. Passivation standards stellar solutions stainless steel. Qqp35 was superseded by amsqqp35 for aerospace products and amsqqp35 was cancelled and superseded by ams2700. Lockheed martin lessons learned stainless steel passivation. The aerospace industry maintained use of the old spec under the designation amsqqp35 until 2005 when it too was canceled and superseded by ams 2700, a newly developed specification that offered a choice between citric acid and nitric acid stainless steel passivation. Passivation of aerospace stainless steel parts with citric acid solutions stephen p. Passivation of corrosion resistant steels ams2700c. Differences between mils5002 type iii and qqp35 type. Ams 5618 is typically used for antifriction bearing components where resistance to both corrosion and wear is essential. This federal specification is superseded by astm a 96796, standard specification for chemical passivation treatments.
Differences between the 2011 and 2018 versions of ams 2700. The nitric acid passivation processes was the original passivation processed specified in qqp35, the first military specification covering passivation, revision a being released in the 1960s. Ams refers to aerospace material specification which is developed and published by sae international which prior to 2006 was known as the society of automotive engineers. Iridite milc5541 mildtl5541 class 3 ams 2474 astm b449 class 3 7. The formation of the protective passive film on a stainless steel will occur spontaneously in air or other oxygencontaining environment when the stainless steel surface is free of oxide scale. The following information shall be provided to the plating processor by the purchaser. May 1, 1998 passivation treatments for corrosionresistant steel 1. Citric acid is not an allowed substitution when qqp35 is called for. It is based on using an acid nitric or citric under highly controlled conditions to remove free iron particles from the surface and to help form a metal oxide layer.
Amsqqp35 passivation treatments for corrosionresistant. Qqp35 passivation treatments for corrosionresistant. The following specs refer to qqp35 for passivation of stainless steel and thus allow the use of astm a967 and ams 2700. Most backordered items can be rushed in from the publisher in as little as 24 hours. Testing water immersion verifies the passivation process on all grades of stainless steel, with exception of 440c. Like astm a967 did for other industries, the new ams specification allows the use of citric acid passivation in the aerospace industry. The final revision qq p 35c and the cancellation notices are available from the us defense logistics agency assist quick search website. Except, replacement for qqp35 is ams 2700 and not astm a 967. Passivation qq p 35 astma967 sae ams qq p 35 ams 2700 phosphate manganese mildtl16232 type m phosphate zinc mildtl16232 type z phosphate light zinc ttc490 silver qq s365 astmb700 zinc qq z325 astmb633 zinc cobalt alloy astmb840 zinc. This document was revised to incorporate the essential requirements of ams qq p 35. Fasteners heat treated to 160 ksi or 36 hrc or above, shall be cleaned in accordance with mildtl5002 and the following.
Sae amsqqp35 february 1, 2005 passivation treatments for corrosionresistant steel this specification covers the different types of passivation treatments as well as recommendations, guidance and precautions for cleaning and descaling corrosionresistant parts, components. Passivation of stainless steel is a process that removes free iron from the surface of a stainless component and at the same time promotes the formation of a thin, dense oxide protective barrier. Amsqqp35 itself was canceled and superseded in february 2005 by ams 2700. Amsqqp35 replaced qqp35 ams 2700 astm a380 astm a967 astm b254 astm f86 titanium components mils5002. Astm a967 and ams 2700 standards for passivation rp abrasives. Passivation treatments for corrosionresistant steel rev c ed. This document is available in either paper or pdf format. Since qqp35 was a federal specification it was an obvious candidate for replacement with a u. Ams 2700 method 2 citric passivation ams 2700 supersedes ams qq p 35 and qq p 35c, but we still offer certification to the superseded specifications qq p 35 type i, type ii, type iii, type iv and type vi. Amsqqp35 has been cancelled and superseded by ams 2700. Parts for which ams qq p 35 or qq p 35 is specified shall be acceptance tested in accordance with 4. The purity of the silver that we plate ranges from 99.
Passivation is a process of making stainless steel more stainless than it would be if left alone. You may also see mention of amsqqp35, which was a stopgap document used by sae. Parts with scale will require mechanical treatment or pickling before passivation. The aerospace industry maintained use of the old spec under the designation ams qq p 35 until 2005 when it too was canceled and superseded by ams 2700, a newly developed specification that offered a choice between citric acid and nitric acid stainless steel passivation. Purchase order shall specify not less than the following. In march 2018, sae issued a new revision, ams 2700 f which superseded ams 2700 e which had been issued in november 2011. After a time, the ams qq p 35 was retired and replaced by the widelyused ams 2700. This process is widely used to clean stainless steels and provides a higher degree of corrosion resistance. We also offer the option of an additional chromate treatment for your silverplated parts, if required.
Ams2700 has a class 4 which is supposed to be used when qqp35 or amsqqp35 are specified. Citric acid passivation for titanium and titanium alloys is now recognized in the astm standard. Passivation is the treatment of the surface of corrosionresistant steels i. In this case the supplier could be an approved a supplier having access to these specs. Parts for which amsqqp35 or qqp35 is specified shall be acceptance tested in accordance with 4. The passivation treatments provided by this specification are intended to improve the corrosion resistance of parts made from austenitic, ferritic and martensitic corrosionresistant steels of the 200, 300 and 400 series and precipitation hardened corrosionresistant steels. This is the standard used by general industries to describe and control the passivation of stainless steel. Abrasive cleaning shall be used for removal of heat treat scale and oxidation as applicable. With strict adherence to qqs365 specifications, we ensure that your parts are silverplated with finishes of your choice matter, semibright, and fully bright. The cancellation notice specifies that qqp35 can be replaced by both astm a967 and ams qqp35.
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