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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It therefore in no way precludes the necessity for careful planning and judgment in the selection and implementation of such procedures. Methods are described for the detection of free iron and transparent chemical and oily deposits. 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.
The standard also allows any combination of citric acid concentration, temperature and time, ashm that the passivation test criteria can paxsivation met. Some of the various meanings associated with the term passivation that are in common usage include the following:. Visual inspection; wipe tests; residual pattern; water-break test; free iron test such as water-wetting or drying; high-humidity test; and copper sulfate test.
Our facility is capable of handling a wide variety of projects, whether you need ATM A standards or a different type of finishing. In addition, visual inspection of internal surfaces is often impossible because of the configuration of the item.
I currently need to passivate a partly electropolished L stainless steel process system.
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. This abstract is a brief summary of the referenced standard. 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.
ASTM A380 Passivation Standard
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. Historical Version s – view previous versions of standard.
Stainless steels cannot be passivated passivatoon the steel surface is clean and free from contamination and scale from welding operations. 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.
Materials shall be precleaned. This would attack electro-polished surfaces and is not the kindest way to treat them. This ensures that the surface of the workpiece is free of scale and contaminates. The treatments are then defined by the process classes.
If the piping system is already assembled, there are service companies which specialize in on-site projects of this sort, like Astropak. Usually it is best to send the spools to a metal finishing shop which is already experienced in and equipped for the process. Regards, Ast Mooney, P. Specific treatments are however also specified. Passivation often follows the process of pickling.
To my knowledge it is not possible to passivation a combination pickling and passivation. From beautiful Pine Beach New Jersey: Process Class Stainless Steel Types C1 or C2 Austenitics, austenitic precipitation hardening and duplex C3 High chromium martensitics C4 Ferritics, martensitics and martensitic precipitation hardening.
ASTM A – Stainless Steel Passivation by Keystone Finishing
Although cannot see the reason obviously myself? Passivation is a post-fabrication method of maximizing the inherent corrosion resistance of stainless satm. Consideration shall be given in the design of parts, equipment, and systems that will require cleaning to minimize the presence of areas in which dirt, or cleaning solutions might become trapped, and to provide for effective circulation and removal of cleaning solutions.
It is also quite out of date and needs to be updated.
This process greatly reduces the formation rust on the surface of the workpiece. Parts treated however must pass specific tests to confirm the effectiveness of the passivation, although in practice the tests are for the detection of the effects of residual iron contamination on the surface of the parts.