B type ii passivation is designed for use with 400 series stainless, screws machining grades 303, 303se, 347se. The difference is sample size for verification testing. Passivation is the treatment of the surface of corrosionresistant steels i. Passivation treatments for corrosionresistant steel rev c ed. Differences between mils5002 type iii and qqp35 type. Like astm a967 did for other industries, the new ams specification allows the use of citric acid passivation in the aerospace industry.
Qqp35 was superseded by amsqqp35 for aerospace products and amsqqp35 was cancelled and superseded by ams2700. 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. Parts with scale will require mechanical treatment or pickling before passivation. 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2700 method 2 citric passivation ams 2700 supersedes ams qq p 35 and qq p 35c, but we still offer certification to the superseded specifications qq p 35 type i, type ii, type iii, type iv and type vi. Louis, missouri, usa amsqqp35 which replaced federal specification qqp35 is an sae standard used in the aerospace industry to. The following information shall be provided to the plating processor by the purchaser. Astm a967 and ams 2700 standards for passivation rp abrasives.
Originally, the amsqqp35 was just a reprint of the qqp35c. This document was revised to incorporate the essential requirements of ams qq p 35. 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. 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. Passivation qq p 35 passivation treatments for corrosion resistant steel ams 2700 passivation of corrosion resistant steel m agellan aerospace processing,newyork, 165field st.
Ams 2700 passivation standard able electropolishing. 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. Ams 2700 method 2 citric passivation ams 2700 supersedes ams qqp35 and qqp35c, but we still offer certification to the superseded specifications qqp35 type i, type ii, type iii, type iv and type vi. 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. When comparing nitric vs citric passivation, the most common method used throughout industry is nitric acid passivation. Passivation of corrosion resistant steels ams2700c. Parts for which ams qq p 35 or qq p 35 is specified shall be acceptance tested in accordance with 4. We also offer the option of an additional chromate treatment for your silverplated parts, if required.
Testing water immersion verifies the passivation process on all grades of stainless steel, with exception of 440c. Purchase order shall specify not less than the following. 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. In this case the supplier could be an approved a supplier having access to these specs. Citric acid is not an allowed substitution when qqp35 is called for. 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. Ams 5618 is typically used for antifriction bearing components where resistance to both corrosion and wear is essential. In march 2018, sae issued a new revision, ams 2700 f which superseded ams 2700 e which had been issued in november 2011.
Parts for which amsqqp35 or qqp35 is specified shall be acceptance tested in accordance with 4. Except, replacement for qqp35 is ams 2700 and not astm a 967. Looking to the reference specs, it seems aerospace applications. This document comes with our free notification service, good for the life of the document. 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. The cancellation notice specifies that qqp35 can be replaced by both astm a967 and ams qqp35. 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 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. Most backordered items can be rushed in from the publisher in as little as 24 hours. Amsqqp35 has been cancelled and superseded by ams 2700.
Fasteners heat treated to 160 ksi or 36 hrc or above, shall be cleaned in accordance with mildtl5002 and the following. Passivation of stainless steel astm a967, qqp35, ams 2700. Ams2700 has a class 4 which is supposed to be used when qq p 35 or ams qq p 35 are specified. 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. It was replaced by amsqqp35, an industry adoption of the original fed spec, and astmf967.
You may also see mention of amsqqp35, which was a stopgap document used by sae. This document is available in either paper or pdf format. You may also see mention of ams qq p 35, which was a stopgap document used by sae. Lockheed martin lessons learned stainless steel passivation.
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. May 1, 1998 passivation treatments for corrosionresistant steel 1. After a time, the amsqqp35 was retired and replaced by the widelyused ams2700. Revision c from 1988 was withdrawn by cancellation notice 3 on 9111998. The final revision qq p 35c and the cancellation notices are available from the us defense logistics agency assist quick search website. Passivation treatments for corrosionresistant steel ss by astma967 or sae ams qq p 35 scope. 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. After testing, speciments shall show no signs of rust or corrosion. Since qqp35 was a federal specification it was an obvious candidate for replacement with a u. Qq p 35 was superseded by ams qq p 35 for aerospace products and ams qq p 35 was cancelled and superseded by ams2700. Jun 03, 2009 except, replacement for qq p 35 is ams 2700 and not astm a 967.
Whatever happened to qqp35, passivation treatments for. 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. Passivation is a process of making stainless steel more stainless than it would be if left alone. Removing these contaminants improves corrosion resistance and. 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. 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. For example, drawings that list qqp35 passivation require the use of nitric acid and, in some cases, hexavalent chromium containing baths.
Qqp35 passivation treatments for corrosionresistant. The cancellation of qqp35 assigns the use of astm a967 or ams 2700 for all dod related activities that list qqp35 for use. 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 alone will not remove heavy adherent oxide films created from heat treatment, welding. The processes defined in this specification have been used typically. Citric acid is not an allowed substitution when qq p 35 is called for. Specifically, this standard refers to the requirements for removing surface contaminants like free iron from the surface of corrosionresistant steel parts. General plating provides services in metal plating and has the capabilities for plating of 17 finishes and specs. The ams 2700 passivation specification pertains to metal passivation services like those performed at able electropolishing. Passivation of aerospace stainless steel parts with citric acid solutions stephen p. Sae amsqqp35 complete document revision a, february 5. The superseding specification, ams 2700, permits the use of citric acid baths in addition to the baths specified in qqp35.
Citric acid passivation for titanium and titanium alloys is now recognized in the astm standard. 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. The following specs refer to qqp35 for passivation of stainless steel and therefore allow the use of astm a967 and ams 2700. This is the standard used by general industries to describe and control the passivation of stainless steel. Revision e of amsqqp416 corrects the errors in table 1a and removes the 24 hours minimum from the drying time requirement of 3. This process is widely used to clean stainless steels and provides a higher degree of corrosion resistance. Many of the qq series of federal specifications are withdrawn now, and qqp35 is no exception. Lockheed martin lessons learned stainless steel passivation general information qqp35 has been cancelled and superseded by astm a967 or amsqqp35. The superseding specification, ams 2700, permits the use of citric acid baths in addition to the baths specified in qq p 35. Passivation treatments for corrosionresistant steel ss by astma967 or saeamsqqp35 scope. 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. It was replaced by ams qq p 35, an industry adoption of the original fed spec, and astmf967.
Passivate clear passivate qqp35 type ii, vi, vii amsqqp35 types ii, vi, vii, viii astm a 96705 astm a380 codes f thru m 5. Amsqqp35 passivation treatments for corrosionresistant. To find similar documents by federal supply class code. Passivation qqp35 passivation treatments for corrosion resistant steel ams 2700 passivation of corrosion resistant steel m agellan aerospace processing,newyork, 165field st. Aisi 400c is available in either standard melted ams 5630 or vacuum melted ams 5618 versions. Ams2700 has a class 4 which is supposed to be used when qqp35 or amsqqp35 are specified. The final revision qqp35c and the cancellation notices are available from the us defense logistics agency assist quick search website. Passivation of aerospace stainless steel parts with citric. Abrasive cleaning shall be used for removal of heat treat scale and oxidation as applicable. Passivation treatments for corrosionresistant steel. Astm a967 citric 1, citric 2, nitric 1 and nitric 2.
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. Passivation standards stellar solutions stainless steel. 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. The purity of the silver that we plate ranges from 99. Revision a actually just issued the cancellation notice, replacing this specification with the ams2700 document. Ams qq p 35 itself was canceled and superseded in february 2005 by ams 2700. Iridite milc5541 mildtl5541 class 3 ams 2474 astm b449 class 3 7.
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