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The ASTM A passivation standard ensures high quality results for passivated stainless steel. Learn how Able Electropolishing meets these standards. 35A, AMS C, ASTM A and ASTM A standards. Passivation alone will not remove heavy adherent oxide films created from heat treatment. Delstar Metal Finishing offers passivation services that meet the ASTM (American Society for Testing and Materials) A standards. The ASTM A standards.

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Can you please a976 me the differences between the passivation processes AMS [link by ed. You should never ask for “standard passivation” on imports. ASTM A renumbered those to nitric 1 through 4, while AMS brought back the ones that had been removed and has types 1 through 8.

If you’re having it done for you, the testing is someone else’s problem, so you might consider AMS The two standards are essentially equivalent. The passivation standards listed in the ASTM document embrace a variety of potential methods and techniques.

ASTM A967 Passivation Standard

We appended your question to a thread which should clearly answer it for you: ASTM A [link by ed. The chemical reactions of the passivating media on the surface of the stainless steel shall be stopped by rinsing of the stainless steel part, with or without a separate neutralization treatment.

Various organizations and groups present specifications for the processes involved in metal finishing treatments. The standards of ASTM A provide specific details of the acceptable methods required for passivating stainless steel. This is applicable all across the globe and replicable by any metal finishing shop. I replied that the parameters are in compliance with standard A but he’s telling that we don’t have objective evidence to support the validation since A defines minimum requirements that could be insufficient to my process.


In reading through the specification I believe the drawing is incorrect. It was cancelled in early in favor of AMS June 11—13, Chicago, IL. Precision Machining Technology Show. Immediately after the removal from the passivating solution, the parts shall be thoroughly rinsed, using stagnant, countercurrent, or spray washes, singly or in combination, with or without a separate chemical treatment for neutralization of the passivation media. I was looking at this thread and had this question What requirement or standard is he auditing you against, since clearly it is not A?

March 7, A.

Stainless steel passivation performed to the ASTM A standards meets these standards by passing tests that confirm its effectiveness, particularly as it pertains to removing free iron from the cold-worked surfaces. Some a9677 ask for the parts to pass salt spray testing longer than A’s required 2 hours, etc.

They also are very specific on such aspects as recommendations and precautions for such things as cleaning, descaling and tests. 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.

It appears that the types are associated with method 1, not method 2. Plating Specifications Download Register. Determining the suitability of A for your specific parts is up to you, or requirements set by your customer.

You can guess the increase in the amount of testing involved. This specification covers several different types of chemical passivation treatments for stainless steel parts.


Passivation is the overlaying of a substrate or base layer with another metal. The “right” spec is the one that your customer requires. Is your business surgical implants, or are you with a passivation shop, or what? Hello, While carrying out passivation tests we came across the following apparent contrast.

Thank you for your hard work which the finishing world continues to benefit from. Especially in the fastener industry I have seen it is difficult to source a specific product according to a specific type within these standards.

A has a lot of excellent recommendations on general cleaning etc. It includes recommendations and precautions for descaling, cleaning, and passivation of stainless steel parts.

John Wilt [returning] – Cambridge, Massachusetts.

ASTM A Standard Passivation Treatment For Stainless Steel

From beautiful Pine Beach New Jersey: It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. Always specify exactly what you want– e. Supplier Requirements Privacy Policy Links. The ASTM provides instructions and acceptance criteria for these and other tests that can asmt the quality of a stainless steel passivation 9a67.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. I am struggling to understand which spec to use for passivation.