Astm a967 05 standard specification for chemical passivation treatments for stainless steel parts. The current astm versions are a38099e1 standard practice for cleaning, descaling, and passivation of stainless steel parts, equipment, and systems and a967 01e1 standard specification for chemical passivation treatments for stainless steel parts. In 1997 an alternative british standard was published. Decapado y pasivado del acero inoxidable international stainless. Astm a380 nitric acid based passivation treatments. The astm a380 passivation standard covers various operations in cleaning, descaling and passivating. Astm b117 testing quality control micom laboratories. Passivated stainless steel passivation is a method of removing free iron contaminants from the surface of stainless steel. New astm a967a967m 20 edition on chemical passivation. Astm american society for testing and materials has issued a specification for stainless steel passivation that allows the use of citric acid solutions as an alternative to nitric acid solutions astm a967 99. For annual book of astm standards volume information, refer to the standards document summary page on the astm website. Passivation is the process of forming a passive layer of chromium oxide on the surface of stainless steel to protect it from corrosion. Active standard astm a967 a967m developed by subcommittee. Astm a967a967m17 standard specification for chemical passivation treatments for stainless steel parts.
Astm a967 archives document centers standards forum. Astm a967 specification for chemical passivation treatments for stainless steel parts based on us defense department standard qqp35c. Proposed changes by dod activities must be submitted to the dod adopting activity. Passivation of stainless steel astm a967, qqp35, ams 2700. The first of the two main passivation standards currently active is astm a967. The astm a967 passivation standard applies to the cleaning, passivation and testing of stainless steel parts. Today, some 12,000 astm standards are used around the world to improve product quality, enhance safety, facilitate market. Astm a967a967m 20 edition has just been released and is available from document center inc.
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. Changes to the new 20 edition of a967a967m can be found in the following areas. Passivate passivation specification stainless steel astm. A 967 01e1 an american national standard standard specication for chemical passivation treatments for stainless steel parts1 this standard is issued under the xed designation a 967. What is astm a967 specification for chemical passivation. Astm a967 allows the use of the new citric acid solution as well as the nitric acid solutions covered in qqp35c. The electronic file may not be reproduced in any way. Lucideon is able to confirm passivation using two tests practice b high humidity and practice d copper sulphate test. This is done by adding a chemical that removes free iron and allows chromium oxide to form. An astm designation number identifies a unique version of an astm standard.
Overview different treatments are available and outlined for stainless steels to remove free surface iron or passivate. Chemical passivation removes free iron and other surface contaminants from stainless steel parts, improving corrosion resistance. Astm a96705 standard specification for chemical passivation treatments for stainless steel parts. The citric acid process is subdivided into citric 1 through citric 5. The new specification for passivation astm a967 replaces qqp35c cancellation notice dated. Qqp35c canceled qqp35c, the longtime military specification for stainless steel passivation, has been canceled in favor of astm a967 and ams 2700. A380 practice for cleaning, descaling, and passivation of stainless steel parts, equipment, and systems. Oct 18, 2017 the term passivation is commonly applied to several distinct operations or processes associated with stainless steel. It includes recommendations and precautions for descaling, cleaning, and passivation of stainless steel parts. Astm a967, \standardization specification for chemical passivation treatments for stainless steel parts\, was adopted on 31mar97 for use by the department of defense dod. Stainless steel parts that undergo these processes may require a variety of treatments, including precleaning, chemical descaling, degreasing and more, all of which can be accomplished different ways. Astm b117 testing quality control astm b117 testing, also known as a standard practice for operating salt spray fog, is used to analyze relative corrosion for specimens of metals and coated metals exposed to various simulated climatic conditions in a controlled environment. Astm a967 passivation standards able electropolishing.
Astma967 astma967, standardization specification for. Passivation is a chemical treatment applied to stainless steel parts to provide resistance to oxidation, rusting and mild chemical attack. Astm a967 chemical passivation treatment for stainless steel. In the last 10 years citric acid solutions have evolved, improving on performance, and reducing costs.
High humidity sample preparation for astm a967 july 7, 2016. Titled standard specification for chemical passivation treatments for stainless steel parts, the new revision is one of our goto documents for chemical passivation. Astma967, \standardization specification for chemical passivation treatments for stainless steel parts\, was adopted on 31mar97 for use by the department of defense dod. This testing practice was initially published in 1939 and rapidly. For referenced astm standards, visit the astm website. Stainless steel passivation performed to the astm a967 standards meets these standards by passing tests. Astma967 adoption notice astma967, standardization specification for chemical passivation treatments for stainless steel parts, was adopted on 31mar97 for use by the department of defense dod. Standard practice for operating salt spray fog apparatus1. Therefore ast uses different types of pickling acids designed to remove these films prior to the passivation of the parts. Astm a967 05e2 standard specification for chemical passivation treatments for stainless steel parts. Cs astm a967 passivation st qqp35c astma967 character food. Bs en 2516 passivation of corrosion resisting steels and decontamination of nickel base alloys.
The standard requires the sample parts to be dried in an inert atmosphere or desicated container. Astm a967 a967m 17 standard specification for chemical passivation treatments for stainless steel parts. Astm a967 allows the use of the new citric acid solution as well as the nitric acid solutions covered in qqp 35c. Astm a967 a967m 17 standard specification for chemical. The following specs refer to astm a967 and ams 2700 for cleaning and passivation of stainless steel. Last previous edition approved in 2001 as a 967 ori. Passivation improves the corrosion resistance properties by facilitating the formation of a very thin, transparent oxide film, which protects the stainless steel from selective oxidation. A number in parentheses indicates the year of last. Passivation standards stellar solutions stainless steel. Passivation of aerospace stainless steel parts with citric. The nitric acid treatments are similar to those identified in astm a380. Standard specification for chemical passivation treatments for stainless steel parts.
Astm a967 specification for chemical passivation treatments for stainless steel parts based on us defense department standard qqp35c in 1997 an alternative british standard was published. Astm international, formerly known as the american society for testing and materials astm, is a globally recognized leader in the development and delivery of international voluntary consensus standards. Titled standard specification for chemical passivation treatments for stainless steel parts, the new revision is one of. These standards are under the jurisdiction of astm subcommittee b02. Astm a380 passivation standard able electropolishing. Astma967 astma967, standardization specification for chemical. 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.
For the purposes of astm a380, passivation is the removal of exogenous iron or iron compounds from the surface of a stainless steel by means of a chemical dissolution, most typically by a treatment with an acid solution that will remove the surface contamination but will not. Astm international 100 barr harbor drive, po box c700. Passivate passivation specification stainless steel astma967. The reference for passivation of stainless steel is astm a967. Qqa35, astm a967, ams 2700 passivate, stainless, steel corrosion resistant. The right to access the electronic files of astm standards is for purposes of viewing for individual use only. En 2516 passivation of corrosion resisting steels and decontamination of nickel base. A967a967m standard specification for chemical passivation. This covers several different types of chemical passivation treatment for stainless steel parts. A967a967m standard specification for chemical passivation treatments for stainless steel parts, 20.
Hello, i need help understanding how to prepare the passivated sample parts for humidity test as per astm a967, specifically with the drying process. Astm a380 practice for cleaning, descaling and passivating of stainless steel parts, equipment and systems. Passivation services asmta967 twin city plating twin. Normas tecnicas astm pdf mega gratis full habla inge. 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. Passivation alone will not remove heavy adherent oxide films created from heat treatment, welding, hotforming and other hightemperature operations. Astm american society for testing and materials has issued a specification for stainless steel passivation that allows the use of citric acid solutions as an alternative to nitric acid solutions astm a96799. Chemical passivation for stainless steel parts per astm a967. B117 practice for operating salt spray fog apparatus. The current astm versions are a38099e1 standard practice for cleaning, descaling, and passivation of stainless steel parts, equipment, and systems and a96701e1 standard specification for chemical passivation treatments for stainless steel parts.
Both practice b and d are visual tests to assess the presence of incomplete passivation. Samples are passed only if no rust or staining or copper deposits. Description of astm a967 2005 astm a967 05e2 historical standard. Changes to the new 20 edition of a967 a967m can be found in the following areas. This specification covers several different types of chemical passivation treatments for stainless steel parts. The statistical data used below are from the precision and bias astm study detailed in astm b11711 operating salt spray fog apparatus. Ihs markit is your source for astm standards and publications. This standard covers both nitric and citric acid treatments. The term passivation is commonly applied to several distinct operations or processes associated with stainless steel. The standard requires the sample parts to be dried in. Standard specification for chemical passivation treatments for. Astma967 standard specification for chemical passivation. Appendix x1 and appendix x2 give some nonmandatory information and provides some general guidelines regarding the selection of passivation treatments appropriate to particular grades of stainless steel.
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