We are currently using the mil spec qqp35c link is to free spec at defense logistics agency, dla. Whatever happened to qqp35, passivation treatments for. Louis, missouri, usa amsqqp35 which replaced federal specification qqp35 is an sae standard used in the aerospace industry to. Amsqqp35 passivation treatments for corrosionresistant steel. Stainless steel passivation services rust prevention for. The first of the two main passivation standards currently active is astm a967. Base materials worked steel, stainless steel types passivation treatments shall be of the following types. Originally, the ams qqp 35 was just a reprint of the qqp35c. A967 allows for passivation using nitric acid or citric acid, followed by a perlot testing using one of several test method options, including copper sulfate. Amsqqp35 passivation treatments for corrosionresistant steel ams 2700 passivation of corrosion resistant steels 304a816, class i weldments general specification for aws d17.
Citric acid passivation for titanium and titanium alloys is now recognized in the astm standard. Astm b600 passivation for titanium and titanium alloys is now recognized in the astm standard. This federal specification is superseded by astm a 96796, standard specification for chemical passivation treatments. Fed qqp35c passivation treatments for corrosionresistant steel superseding qqp35b ss by astma9671999e1 or saeamsqqp35 standard by federal specifications and standards, 10281988 amendments available. I have milspec hardware that calls out for passivation per amsqqp35, type 6 or 7. Qqp35 passivation treatments for corrosionresistant. 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. Passivation alone will not remove heavy adherent oxide films created from heat treatment, welding. Passivation of aerospace stainless steel parts with citric. This specification covers the different types of passivation treatments as well as. Material acid cleaning creates passivating layer a few atoms thick. Also referencing nitric acid for passivation of stainless steel is astm. Equivalent to qqp35 spec for passivation of stainless steel.
Information and documents presented here are works of the u. Lockheed martin lessons learned stainless steel passivation. Amsqqp35 passivation treatments for corrosionresistant steel free download as pdf file. Where amsqqp35 is called out or you got to it by following the qqp35 cancellation.
Amsqqp35 passivation treatments for corrosionresistant. Many of the qq series of federal specifications are withdrawn now, and qqp35 is no exception. This process is widely used to clean stainless steels and provides a higher degree of corrosion resistance. Most military standards that require passivation still specify qqp35, even though the military cancelled the standard and turned it over to sae international to maintain as amsqqp35. Passivation treatments for corrosionresistant steelcancelled feb 2005 amsqqp35a 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. Sae aerospace materials specification ams amsqqp35, passivation treatments for corrosionresistant steel.
Passivation treatments for corrosionresistant steel ss by astma967 or saeamsqqp35 scope. Fed qqp35c notice 3 cancellation passivation treatments for corrosionresistant steel superseding qqp35b ss by astma9671999e1 or saeamsqqp35 amendment by federal specifications and standards, 09111998. Astm f86 standard practice for surface preparation and marking of metallic surgical implants. Advance surface technologies provides both nitric and citric passivation treatments on titanium and stainless steel alloys that adhere to qqp35c, amsqqp. Government and are not subject to protection in the u. Amsqqp35 itself was canceled and superseded in february 2005 by ams 2700. Like astm a967 did for other industries, the new ams specification allows the use of citric acid passivation in the aerospace industry. Passivation improves the corrosion resistance properties of components made of precipitationhardened, austenitic, ferritic and martensitic steels. Developments in citric acid passivation of stainless steel. Passivation of stainless steel astm a967, qqp35, ams 2700.
When a post treatment is specified, after rinsing, parts made from ferritic. Passivation treatments for corrosionresistant steel ss byastma967 or saeamsqqp35 document status. Citric acid passivation as an alternative to nitric acid treatments. Hitech metal finishing provides high quality metal finishing services to the aerospace industry, as well as automotive manufacturers. Stainless steel passivation general information qqp35 has been cancelled and superseded by astm a967 or ams qqp 35. Passivation treatments for corrosionresistant steel amsqqp35 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.
Louis, missouri, usa ams qqp 35 which replaced federal specification qqp35 is an sae standard used in the aerospace industry to passivate stainless steel parts. Passivation treatments improve the surface condition of stainless steel by dissolving iron that has been imbedded in the surface during forming or machining. Passivation chemistry wikimili, the best wikipedia reader. Conduct of passivation treatments citric 1 through citric 5 plus water rinse including. Chosen processes shall follow the recommended guidelines in the alloy tables fig x1. The passivation process is compatible with grade 303, 304, and 316 alloys and is typically performed to astm a9367 and similar industry specifications for chemical passivation.
Although stainless steel is known to be a corrosion resistant alloy, it can become reactive after subjected to certain manufacturing applications such as machining or shot peening. Full description this specification covers the different types of passivation treatments as well as recommendtions, guidance and precautions for cleaning and descaling corrosionresistant parts, components, equipment and systems. Passivation involves a shielding outerlayer of base material, which can be applied as a microcoating, or oxidation which occurs spontaneously in nature. 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. I am a mechanical engineer trying to address a surface treatment problem. The citric acid process is subdivided into citric 1 through citric 5.
Aerospace applications require the use of amsqqp35. Free iron readily oxidizes, forming visible rust on the surface of the product. The public law, known as nttaa, directs federal agencies to use technical standards that are developed or adopted by voluntary consensus standards bodies. Qqp35, passivation treatments for corrosion resistant steel, is another government document that was cancelled due to the implementation of the national technology transfer and advancement act in the mid1990s. Astm a967 standard specification for chemical passivation treatments for stainless steel parts still remains in effect. 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. Stainless steel passivation protects stainless steel and is used to repair and restore the material surface as needed. Passivation of aerospace stainless steel parts with citric acid solutions stephen p. The public law, known as nttaa, directs federal agencies to use technical standards that are developed or adopted by voluntary. We deliver onestop processing from our centrally located facility in denton, texas, where we hold a wide variety of oem approvals for many segments.
Amsqqp35 has been cancelled and superseded by ams 2700. The two standards, except for some format changes so it looks like other sae standards, are identical. Equivalent to qqp35 spec for passivation of stainless. Find the most uptodate version of sae amsqqp35 at engineering360. Standard practice for surface preparation and marking of metallic surgical implants. 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 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. Appendix x1 gives some nonmandatory information and provides some general guidelines regarding the selection of passivation treatment appropriate to particular grades of stainless steel. Heat scale, whether it is caused by heat treatment, welding or other hot work, can appear in a range of colors. Passivation of stainless steel is a chemical treatment with a specific acid formulation.
It makes no recommendations regarding the suitability of any. Astm a 967, chemical passivation treatments for stainless steel parts. Astm a380 practice for cleaning, descaling and passivating of stainless steel parts, equipment and systems, astm a967 specification for chemical passivation treatments for stainless steel parts based on us defense department standard qqp35c one of the most common passivation specifications, ams 2700. Passivation, in physical chemistry and engineering, refers to a material becoming passive, that is, being less affected by environmental factors such as air and water. By this action, amsqqp35 will remain listed in the. Passivation treatments for corrosionresistant steel rev c ed. Originally, the amsqqp35 was just a reprint of the qqp35c. Astm a967a967m 20 edition has just been released and is available from document center inc. Passivation is the treatment of the surface of corrosionresistant steels i. Sae amsqqp35 passivation treatments for corrosionresistant steel used for reference purposes superseded by ams2700 sae ams 2700 passivation of corrosion resistant steels usp usp38 nf33 us pharmacopeia updating. Titled standard specification for chemical passivation treatments for stainless steel parts, the new revision is one of our goto documents for chemical passivation.
Sae amsqqp35 has been replaced by ams2700 passivation treatments for corrosionresistant steel. Type ii medium temperature nitric acid solution with sodium dichromate additive. Astro pak has taken the lead in advancing the technology of using citric acid for passivating of stainless steel used in a wide. Passivation treatments for corrosionresistant steel. Ams 2700 method 1 type 2 free pdf ams 2700 method 1 type 2 free pdf. Stainless passivation specifications in use at electrolurgy.