Superior Corrosion Resistance
RP Abrasives is an ISO 9001:2015 registered job shop that provides passivation services for stainless steel & titanium. RPA passivates to ASTM 967 & AMS 2700 standards that allow for citric acid passivation.
Many of RPA’s customers make parts for industries that require passivating, so RPA saw a need to provide a service that would give our customers a “one-stop shop” by providing citric acid passivation services. Also, utilizing citric acid fits into RPA’s environmental goals of providing services that have minimal or no impact on our environment.
ASTM Passivation Standard
The specification was originally set by the U.S. Department of Defense and involved strictly nitric acid. This original spec. was QQP 35 written in the late 1960’s then in 1998 the DoD withdrew their standard in favor of ASTM 967 spec. The ASTM 967 spec. along with the aerospace industry spec of AMS 2700 which replaced AMS QQP-35 allows for citric acid, as well as the older nitric acid process. Many experts in the industry feel that citric acid is superior to nitric acid because it is more selective in its removal of “free irons”.
The service we provide also includes the ASTM 380 specification which is a cleaning step before passivation. RPA’s passivation services not only provide you with a passivated part but a very clean part as well. RPA prides itself on running clean passivation and rinse tanks by using proprietary steps to ensure that the tanks never hit the maximum level of parts per million that ASTM B600, ASTM 967 or AMS 2700 allow. This is a particular point of pride for us here at RPA.
Passivation allows for significant improvement in a part’s ability to resist rusting without adding anything to the surface or changing the size of the part, even by a very small amount. In addition, when passivation is done correctly the customer ends up with a very clean part. This is because a part of the finishing process requires aggressive cleaning and preparing the surface to be passivated.
So the next time you have a part that requires passivation, contact us for a free quote!