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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This standard covers both nitric and citric acid treatments. Precaution shall always 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 often follows the process of pickling.

Passivation treatments are sometimes specified, but it is important to consider whether this is strictly necessary or not. Although cannot see the reason obviously myself? Citric acid treatments can also be considered as an alternative to nitric acid as both provide the oxidising conditions necessary for passivation. Lee Kremer Stellar Solutions, Inc. Citric acid is a less hazardous method and has environmental benefits in terms of ‘NOx’ fume emission and waste acid disposal.

In some cases, no more than degreasing or removal of gross contamination is necessary. Unlike ASTM A, the standard does not require specific solutions for particular stainless steel grades or types, although 3 specific treatments are identified. Methods are described for passkvation detection of free iron and transparent chemical passivatoin oily deposits. Nitric acid alone can be used to remove light surface iron contamination after which the acid facilitates the passiation of the cleaned steel surface.


Specifications for passivation treatments for stainless steels Traditionally the American standards have been used. Pickling, passivation and removing iron contamination with nitric acid Passivation treatments are sometimes specified, but it is important to consider whether this is strictly necessary or not.

Having been in the metal finishing passivationn for nearly a century, Keystone Corporation meets the qualified standards of ASTM A and is well qualified to handle your passivation needs.

Article: Passivation of stainless steels

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

For certain exceptional applications, additional requirements which are not covered by this practice may be specified upon agreement between the supplier and the purchaser. Give us a call or visit our contact page to request a quote for your project today! For more specific safety precautions see 7.

From beautiful Pine Beach New Jersey: The treatments are then defined by the process classes. In the case of classes C3 and C4, a two step process is defined, with a clean water rinse between the two steps, shown in the table below.

In addition, this standard also includes citric acid treatments.

Meaningful tests to establish the degree of cleanness of a surface passivayion few, and those are often difficult to administer and to evaluate objectively. If you let this solution inside your S. Stainless steels cannot be passivated unless the steel surface is clean and free from contamination and scale from welding operations.

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Related Links Suppliers of Passivating Products. 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. These recommendations are presented as procedures for guidance when it is recognized that for a particular service it is desired to remove surface contaminants that may impair the normal corrosion resistance, paasivation result in the later contamination of the particular stainless steel grade, or cause product contamination.


Visual inspection is suitable for the detection of gross contamination, scale, rust, and particulates, but may not reveal the presence of thin films of oil or residual chemical films. This abstract is a brief summary of the referenced standard.

ASTM A Passivation Standard | Able Electropolishing

In order to avoid ambiguity in the setting of requirements, it may be necessary for the purchaser to define precisely the intended meaning of passivation. Some of the various meanings associated with the term passivation that are in common usage include the following:. If the piping system is already assembled, there are service companies which specialize in on-site projects of this sort, like Astropak.

Could someone confirm or deny this effect? This formula should not hurt your electropolished surfaces. ASTM does not passivvation any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Office and Postal Address: It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.