This is a standard used by the aerospace industry to describe and control the passivation of stainless steel. Advance surface technologies provides both nitric and citric passivation treatments on titanium and stainless steel alloys that adhere to qqp35c, ams qqp35a, ams 2700c, astm a 96705 and astm a 38006 standards. Sae standard for passivation of corrosion resistant steels. The new specifications allow you to do your stainless steel passivation with state of the art citrisurf citric acid passivation technology that is safe and environmentally friendly. Ams 2700 passivation standard able electropolishing. Astma967 standard specification for chemical passivation. The sixth edition, revision f, is used to remove rust from stainless steel. Did astm a38096 go away, and astm a96796 replace it. A complete list of each of these changes is listed in 8.
For large orders, we would be prepared to introduce other passivation processes such as citric acid passivation. Passivation of corrosion resistant steels ams2700f. What is astm a967 specification for chemical passivation. This surface discoloration can be caused by a number of factors which may include salt air, salt on roads, nearby mild steel cutting or. Passivation alone will not remove heavy adherent oxide films created from heat treatment. Surface treatments and inorganic coatings for metal surfaces of weapons systems this specification is approved for use by all departments and agencies of the department of defense. Bands should always be double wrapped and will accommodate diameters up to approximately. Ams 2700 gives requirements for nitric acid concentration in volume percent. Passivation is a process of making stainless steel more stainless rustresistant then it would be if left alone. Passivation of corrosion resistant steels ams2700 this specification defines the engineering requirements for a process to assure removal of free iron or other less noble contaminants from the surfaces of corrosion resistant steel parts. Astma967 standard specification for chemical passivation treatments.
Ams 2700 revision e just released on passivation of corrosion. Pickling and passivating stainless steel light scaling left on weld caps and heat tint on the surrounding parent tube surfaces can usually be removed by acid pickling. Selection of the correct passivation process is determined by the stainless steel alloy involved and by the specification requirements. It is not a coating and does not change any dimensions of a part. Passivation of corrosion resistant steels features method 1, passivation in nitric acid, and method 2, citric acid, and 8 types. This specification covers the requirements for cleaning, surface treatment, and. The ams 2700 passivation specification pertains to metal passivation services like those performed at able electropolishing. 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.
The more i read that document and the document it superceded, qqp35, the more i am confounded. The other main passivation standard currently active, used in the aerospace industry, is ams 2700. The ams 2700 passivation specification addresses industry standards for treating certain types of stainless steel parts, and its a standard the able electropolishing meets. Specifically, this standard refers to the requirements for removing surface contaminants like free iron from the surface of corrosionresistant steel parts. The nitric acid treatments are labeled method 1 and given as eight different variations called types, in keeping with the old qqp35. Passivation standards stellar solutions stainless steel. Similarly to astm a967, it allows for passivation using either nitric acid or citric acid. Passivation is a chemical cleaning process to improve the corrosion. This covers several different types of chemical passivation treatment for stainless steel parts.
Patchy, uneven pickled surfaces can result if surfaces are not clean before the acid treatment. Ams 2700 and designed for use with the 600058 hand banding tool or the 600067 pneumatic banding, extended length standard band is precision constructed of 300 series sstpassivate i. Qqa250129 astm b209 ams 4037 ams 4003 astm b479 beryllium copper astm b194 brass ams 4505 astm b36 astmb16 astm b591 copper astm b152 ams4500 cobalt alloys alloy 188 ams 5608 ams 5801 waspaloy ams 5544 ams 5708 ams 5828 nickel alloys inconel 600 bar astm b166 ams 5665 din 17752 inconel 600 sheet astm b168 ams 5604 din 17750. Passivation of stainless steel astm a967, qqp35, ams 2700. Passivation ams 2700, astm a 380, astm a 967 anoplate, inc. Astm a967 and ams 2700 standards for passivation rp. 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. Passivation is used to improve the surface condition of stainless steel by dissolving the iron that is embedded in the surface by forming, machining, or other manufacturing steps. Passivation is the treatment of the surface of corrosionresistant steels i. Field cleaning and passivation of stainless steel in certain environments, all stainless steel materials can develop surface discoloration. Ams2700e is issued to incorporate all changes approved by ams committee b.
The metal finishing experts at rp abrasives explain the key aspects of the astm a967 and ams 2700 standards for stainless steel passivation. Apr 01, 2004 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. Finish specifications cross reference this chart is an approximate reference only. The specifications listed are similar but not identical. Below is a technical summary of specification ams 2700c from ams sae for passivation.
Passivation alone will not remove heavy adherent oxide films created from heat treatment, welding. Our extensive experience with passivation allows us to choose and match the appropriate passivation and pickling procedure for your needs and specific stainless steel grades. Passivation of corrosion resistant steels ams2700e. Qqa35, astm a967, ams 2700 passivate, stainless, steel corrosion resistant. Removing these contaminants improves corrosion resistance and. This specification covers the requirements for a process to assure removal of free iron or. Sep 23, 2010 we are nadcap accredited for chemical processing, specifically passivation, and as such we follow ams 2700 to the letter. Astm a967 chemical passivation treatment for stainless steel. The new edition replaces ams 2700 revision d which was released back in july. For more information on our full line of passivation services please visit our passivation of stainless steel page. As a global organization of engineers and other technical experts, sae international provides consensusformed standards that. This specification covers several different types of chemical passivation treatments for stainless steel parts.
These operations can remove the passive oxide layer thereby exposing iron or transferring iron onto the surface. Ams 2700 type 2, type 6 or type 7 ams 2700 replaces qqp35 and ams qqp35. 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. Citric acid passivation of citric acid passivation of.
Either method may be used unless a method is specified by purchaser. Astm a967 and ams 2700 standards for passivation rp abrasives. Qqp35c canceled qqp35c, the longtime military specification for stainless steel passivation, has been canceled in favor of astm a967 and ams 2700. Ams2700e is issued to incorporate all changes approved by ams committee b by 28 day limited scope ballot closed on 6142011 and which were intended to be reflected in ams2700d but some of which were inadvertently omitted. The 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. Conclusions state the effectiveness of citric acid to passivate stainless steel, and the potential to have citric acid replace nitric acid passivation solutions that are currently being used in the aerospace industry. Slickote dry lube 100 solid film lubricant, as5272 ty 1 mill46010e ty 1 technical data sheet page 1 of 2 description.
Passivate passivation specification stainless steel astma967. Astm a967 ams 2700 qqp35 replaced w astm a967 ams qqp35 replaced w ams 2700 spec 11200071 code 2021 astm a380 iaw 79p050000, code 2041 lockheed iaw 79p050000, code 2042 lockheed milf14072300 e. My customer wants to put a38096 on his print for standard passivation, but my plater tells me that he passivates to a96796. Slickote dry lube 100 solid film lubricant, as5272 ty 1 mil. The largest design and contract manufacturing show in north america, the schaumburg design2part show is the most efficient place to meet hundreds of highquality american suppliers of custom parts, stock parts, and manufacturing services. Slickote dry lube 100 is a heat cured, resin bonded solid film lubricant coating which meets the. Bands should always be double wrapped and will accommodate diameters up to approximately 1. Thank you for visiting the advanced plating technologies specification database. Ams2700 and astm a967 both allow the use either nitric acid or citric acid. A discussion started in 2003 but continuing through 2019. It includes recommendations and precautions for descaling, cleaning, and passivation of stainless steel parts. Passivation of aerospace stainless steel parts with citric.
Due to current capacity constraints, printed versions of our publications including standards, technical papers, edge reports, scholarly journal articles, books, and paint chips may experience shipping delays of up to four to six weeks. Parts with scale will require mechanical treatment or pickling before passivation. Astm a 96705 specifications qqp35c ams qqp35a specifications ams 2700c specifications astm a 96705 specifications nitric acid methods. To resolve questions, consult the latest revision of the actual specification. Dec 07, 2011 ams 2700 revision e, passivation of corrosion resistant steels, has just been released.
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