Cleaning, Descaling, and Passivation of Stainless Steel This standard is issued under the fixed designation A; the number immediately. Pickling, passivation and removing iron contamination with nitric acid ASTM A – Practice for Cleaning, Descaling and Passivating of Stainless Steel Parts, . Passivation per ASTM A Posted on November 29, Latest News. APT to Exhibit at SHOT Show in Las Vegas, NV. Advanced Plating.
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Lee Kremer Stellar Solutions, Inc. On the other hand, some of the practices may be applicable for these purposes. In addition, this standard also includes citric acid treatments. Precaution shall passibation be practiced to minimize iron contamination, in reuse of cleaning and pickling solution, in water rinsing, in circulation of cleaning solutions and rinse water, in protection of cleaned surfaces, for safety, and disposal of used solutions and water.
Passivation is a process that removes exogenous iron or iron compounds from the surface of the oassivation steel alloy. Some of the various meanings associated with the term passivation pasivation are in common usage include the following:. There are better formulations for doing what passivatoin want, however, that are available on a proprietary basis. I think you may be thinking of ammonium hydrogen difluoride which is often used in place of hydrofluoric acid in pickle solutions.
While the practice provides recommendations and information concerning the use of acids and other cleaning and descaling agents, it cannot encompass detailed cleaning procedures for specific types of equipment or installations. Stainless steels cannot be passivated unless passifation steel surface is clean and free from contamination and scale from welding operations.
Our facilities are capable of handling both large and small parts. Scales shall be removed through chemical descaling, acid pickling, and mechanical descaling. You do not need super quality water for these processes; DI or RO water will be fine.
Stainless steels are designed to naturally self-passivate whenever a clean surface is exposed to an environment that can provide enough oxygen to form the chromium rich oxide surface layer, on which the corrosion resistance of these alloys depends.
I agree with Lee that what you are proposing should not be a problem with the Aztm surfaces. Passivation often follows the process of pickling. The standard also allows any combination of citric acid concentration, temperature and time, provided that the passivation test criteria can be met. This process is pasivation in a general way in 6. Tests with acceptance criteria to demonstrate that the passivation procedures have been successful are listed in 7.
The degree of cleanness required on a surface depends on the application. For more specific safety precautions see 7. Citric acid passivation as an alternative to nitric acid treatments S380 acid treatments can also be considered as an alternative to nitric acid as both provide the oxidising conditions necessary for passivation.
Degreasing and 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 vapor degreasing; by ultrasonics using various cleaners; by steam, with or without a cleaner; or by high-pressure water-jetting. Our facility is capable of handling a wide variety of projects, whether you need ATM A standards or a different type of finishing.
Usually it is best to send the spools to a metal finishing shop which is already experienced in and equipped for the process.
Give us a call or visit our contact page to request a quote for your project today! Although cannot see the reason obviously myself?
ASTM A Passivation Standard | Able Electropolishing
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This process greatly reduces the formation rust on the surface adtm the workpiece.
In addition, visual inspection of internal surfaces is often impossible because of the configuration of the item. All information presented is for a3880 reference and does not represent a professional opinion nor the policy of an author’s employer.
Specific treatments are however also specified. Specifications for passivation treatments for stainless steels Traditionally the American standards have been used. Citric acid treatments can also be considered as an alternative to nitric acid as both provide the oxidising conditions necessary for passivation. It was at one time considered that an oxidizing treatment was necessary to establish this passive metal oxide film, passivatiin it is now accepted that this film will form spontaneously in asstm oxygen-containing environment providing that the surface has been thoroughly cleaned or descaled.
Passivation of 316L SS per ASTM A380
Visual inspection; wipe tests; residual pattern; water-break test; free iron test such as water-wetting or drying; high-humidity test; and copper sulfate passivagion. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Some of the various meanings associated with the term passivation that are in common usage include the following: Office and Postal Address: Passivation of stainless steels Introduction Stainless steels are designed to naturally self-passivate whenever a clean surface is exposed to an environment that can provide enough oxygen to form the chromium rich oxide surface layer, on which the corrosion resistance of these alloys depends.
Such chemical treatment is generally not necessary for the formation of the passive metal oxide film. In some cases, no xstm than degreasing or removal of gross contamination is necessary. I am not sure exactly what you want to do, but the citric formulations can give you increased performance over the old nitric formulations.