Understanding ASTM A967 and AMS 2700 Standards

These are widely used standards for passivating metal components. Passivation is mainly used to passivate or make the surface of stainless steel chemically passive. A surface that is passive is less likely to oxidize, or in everyday terms, to rust.

Stainless steel (sometimes called corrosion resistant steel) is named stainless because it “stains” or in everyday terms “rusts” less than other grades of steel. Stainless steel can still “stain” or “rust”; although it is far less likely to do so.

Stainless steel can be made more stainless, or rust-resistant, by a process called passivation. This is where ASTM A967 and AMS 2700 come in. They are industrial standards that describe how to properly passivate stainless steel. In other words, they describe the proper methods for improving stainless steels ability to resist rusting or staining.

ASTM began in 1898 as the American Section of the International Association for Testing Materials. Later it changed to the American Society for Testing and Materials and is now ASTM international.

ASTM A967 is the standard most frequently used by general industry for describing and controlling the process of passivation. The process uses acid and certain additives under tightly controlled conditions to remove very fine free iron particles from the surface. This increases stainless steels ability to resist rusting.

AMS refers to Aerospace Material Specification which are developed and published by SAE International. The Society of Automotive Engineers started in 1905 and quickly began working with other engineering societies. In 2006, at the age of 101, its name changed to SAE International.

AMS 2700 is the standard most frequently used by the aerospace industry for describing and controlling the process of passivation.

In summary, both standards describe and control how stainless steel (corrosion resistant steel) can be made more stainless or corrosion resistant, thereby allowing products to work in harsh conditions, to work longer and to be more reliable than they otherwise would be. To learn more about the innovative passivation services RP Abrasives provides, including citric acid passivation, contact us today.