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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The standards of ASTM A provide specific details of the acceptable methods required for passivating stainless steel. This asm covers several different types of chemical passivation treatments for stainless steel parts. One of the differences is in the definition of ‘a lot’ for testing purposes.
These tests include the following practices:. Stainless Steel Passivation and More Able Electropolishing provides metal passivation services that meet the ASTM A standards, as well as other finishing treatments that improve the corrosion resistance of stainless steel and various other alloys. Have the plater do so, and then certify to multiple standards. The passivation standards listed in the ASTM document embrace a variety of potential methods and wstm.
In reading ASTM A and AMS it seems that there is quite a bit of overlap but with differences in the bath variables or verification requirements. Copper sulfate testing Damp Cloth Test High humidity testing Potassium Ferricyanide—Nitric Acid Test Salt spray testing Water immersion testing The instructions for conducting such tests as well as the acceptable results are also provided.
The two standards are essentially equivalent. The tests the ASTM document considers valid are the following: This is actually an oversight of A that asm be corrected in the next revision. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. Also, how common is it for a purchaser of a good to specify a specific passivation type in a standard rather than reference the entire standard and leave the type selection up to the manufacturer?
John Wilt [returning] – Cambridge, Massachusetts. Ray Kremer Stellar Solutions, Inc.
The ASTM has established certain criterion to achieve consistent product quality in the metal finishing industry. 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.
November 27, — this entry appended to this thread by editor in lieu of spawning a duplicative thread A. If so, how could I support that statement?
ASTM A Passivation Standards | Passivated Stainless Steel Parts
Is one better than another for medical devices? Method 1 is subdivided into 8 Types corresponding to the types in old QQ-P while Method 2 is not subdivided. What should I tell my customer? AMS considers different parts, or the same part made at different times, to be different lots with the exception for parts with the legacy QQ-P called out, when you can use the older definition.
This auditor you are dealing with, what organization is he with? The tests the ASTM document considers valid are the following:. It was cancelled in early in favor of AMS Ray, Thank you for answering.
ASTM A967 Passivation Standard
At its basis, the intent of this specification is to ensure that metal asstm shop uses either citric or nitric passivation correctly adtm produce quality results. If you do not specify, they can use whatever they want, even ways that are not in any of the specifications!
In the ASTM A and the nitric acid concentrations mentioned must be percentage by volume of a reagent of 67 wt. Is your business surgical implants, or are you with a passivation shop, or what? You can guess the increase in the amount of testing involved. Is there any clear direction or is it optional?
The approach involves several steps. Link to Active This link will always route to the current Active version of the standard. This is applicable all across the globe and replicable by any metal finishing shop.
Rest in peace, Ken. This specification makes no recommendations regarding the suitability of any grade, treatment, or acceptance criteria for any particular application or class of applications. Various organizations and groups present specifications for the processes involved in metal finishing treatments.
ASTM A [link by ed. AMS [link by ed. These ASTM-approved tests may include: The 3 consensus specifications used at this time, and that should be used for all specifications of passivation are:.
To me this means volume percent of pure nitric acid, resulting in significantly stronger passivation solutions than AMS Both contain a carryover of QQ-PC with the addition of the more recently developed citric acid based process.
As you see, we added your question to a thread which already answers it. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The intent is to remove any foreign or undesirable traits and improve the corrosion resistance of the stainless steel component.
Chemical passivation removes free iron and other surface contaminants from stainless steel parts, improving corrosion resistance.
Combining values from the two systems may result in non-conformance with the standard. I replied that the parameters are in compliance with standard A but he’s telling that we don’t have objective evidence to support wstm validation since A defines minimum requirements that could be insufficient to my process. Jan, Both standards are based heavily on the old QQ-P