18 Oct ASTM A/AM Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems. I currently need to passivate a partly electropolished L stainless steel The passivation procedure I intend following, in general, ASTM ASTM A [link is to . Specifying Pickling and Passivation. Pickling and Stainless steels will naturally self-passivate whenever a .. standards ASTM A and A outline iron.
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In some cases, no more than degreasing or removal of gross contamination is necessary. Customer Quotes “We have never had an issue with Classic Electropolishing. Although cannot see the reason obviously myself? Others, such as food-handling, pharmaceutical, aerospace, and certain nuclear applications, may require extremely high levels of cleanness, including removal of all detectable residual chemical films and astm a380 passivation that are invisible to ordinary inspection methods.
We understand tight specifications and because of this we know how to adhere passivatino standards and processes. Naturally occurring conditions such astm a380 passivation or aerated water will do this and so under many exposure conditions stainless steels will naturally self-passivate.
To my knowledge it is not possible to do a combination pickling and passivation. The standard also allows any combination of citric acid concentration, temperature and time, provided that the passivation test criteria can be met. Passivation often follows the process of pickling. Pasxivation on the application, chemical descaling acid pickling as described in 5. Methods are described for the detection of astm a380 passivation iron and transparent chemical and oily deposits.
Unlike ASTM A, the astm a380 passivation does not require specific solutions for particular stainless steel grades or types, although 3 specific treatments are identified. Office and Postal Address: Classic Electropolishing provides services for complex industry supply chains.
Having been in the metal finishing industry for nearly a century, Astm a380 passivation Corporation meets the qualified standards of ASTM A and is well qualified to handle your passivation needs. Website by Dan Voell. ASTM A deals with the standards for cleaning, descaling, and passivation of stainless steel parts, equipment, and systems.
Our facility apssivation capable of handling a wide variety of projects, whether you need ATM A standards or a different type of finishing. Some of the various meanings associated with the term astm a380 passivation that are in common usage include the following: Keystone Corporation is an industry leader in the passivation of stainless steel. For more specific safety precautions see 7.
Specifications for passivation treatments for stainless steels Traditionally the American standards have been used. Degreasing astm a380 passivation general cleaning shall be accomplished by immersion in, swabbing with, or spraying with alkaline, emulsion, chelate, acid, solvent, or detergent cleaners or a combination of these; by passivstion degreasing; by ultrasonics using various cleaners; by steam, with or without a cleaner; or by high-pressure water-jetting.
Although they apply primarily to materials in the composition ranges of the austenitic, ferritic, martensitic, and duplex stainless steels, the practices described may also astm a380 passivation useful for cleaning other metals if due consideration is given to corrosion and possible metallurgical effects.
It was at one time considered that an oxidizing treatment was necessary to establish this passive metal oxide film, but it is now accepted that this film will form spontaneously in an oxygen-containing environment providing that the surface has been thoroughly cleaned or descaled. This process greatly reduces the formation rust on the astm a380 passivation of the workpiece.
Visual inspection is suitable for the astm a380 passivation of gross contamination, scale, rust, and particulates, but may not reveal the presence of thin films of oil or residual chemical films.
This formula should not hurt your electropolished surfaces. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
You do not need super quality water for these processes; DI or RO water will be fine. Usually it is best to send the spools to passivaiton metal finishing shop which is already experienced in and equipped for the process. Combining values from the two systems may result in non-conformance with the standard.
A30 Electropolishing has the capabilities to accomplish of these processes. ASTM does not give any warranty express or implied or make any representation that the contents of astm a380 passivation abstract are accurate, complete or up to date. I believe you must pickle the spools with an acid which contains fluoride in some form — often a standard nitric-hydrofluoric pickling acid or pickling paste, and follow this either with electropolishing or with nitric acid passivation or citric acid passivation to the standards discussed 3a80.
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Passivation of L SS per ASTM A
Scales shall be removed through chemical descaling, acid pickling, and mechanical descaling. For certain astm a380 passivation applications, additional requirements which are not covered by this practice may be specified upon agreement between the supplier and the purchaser.
Materials shall be precleaned. Meaningful tests to establish the degree of cleanness of a surface are few, and those are often difficult to administer and to evaluate objectively.
The following shall be used as the basis for cleanness acceptability: Astm a380 passivation to Active This link will always route to the current Active version of the standard. This Astm a380 passivation also deals with the pre-cleaning stage which can be done with pickling, ultrasonics and degreasing.
This standard covers both nitric and citric acid treatments.
Passivation of 316L SS per ASTM A380
Nitric acid alone can be used to remove light surface iron contamination after which the acid facilitates the passivation of the cleaned passiation surface. Could someone confirm or astm a380 passivation this effect?
In the case of astm a380 passivation C3 and C4, a two step process is defined, with a clean water rinse between the two steps, shown in the table below. I think you may be thinking of ammonium aztm difluoride which is often used in place of hydrofluoric acid in pickle solutions.
ASTM A – Stainless Steel Passivation by Keystone Finishing
Stainless steels cannot be passivated unless the steel surface is clean and free from contamination and scale from welding operations. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
On the other hand, some of the practices may be applicable for these astm a380 passivation. Historical Version s – view previous versions of standard. It is also quite out of date and needs astm a380 passivation be updated.