What is ASTM A967?
ASTM A967 is an industry standard specification for the chemical passivation treatments for Stainless Steel parts. ASTM A967 passivation standards apply to the passivation, cleaning and testing of Stainless Steel parts. ASTM A967 standards help industries to ensure safe and reliable passivation services using nitric acid immersion, citric acid immersion and electromechanical treatments such as Electropolishing.
Who is ASTM?
ASTM is the American Society for Testing and Materials. ASTM International offers global access to fully transparent standards development for industry with over 12,500 global ASTM standards, 30,000 + volunteer members with over 140 participating countries. Their focus is to promote public health and safety through leadership in the standards community, attract and retain technical experts from around the world to enhance the technical quality of standards and related content.
ASTM A967 Specifications
Some of the key elements of the ASTM A967 standard involve the chemical passivation treatments themselves as well as the processes to be utilized upon the removal from the passivating solution and the inspection of the Stainless Steel parts. Passivated parts shall exhibit a chemically clean surface and shall on visual inspection show no etching, pitting or frosting. A series of tests shall then be performed on the stainless-steel parts including a water immersion test, high humidity test, salt spray test, copper sulfate test, potassium ferricyanide-nitric acid test, damp cloth test and boiling water immersion test. A free iron test will then be performed to detect any free iron on the surface of the stainless steel.
Why the ASTM A967 Standard Matters
The ASTM A967 as well as other industry standards help to ensure consistent quality and give manufacturers peace of mind knowing that their metal finisher has the proper certifications and validations in place at their facilities. New England Electropolishing undergoes periodic testing by an independent laboratory for meeting the requirements of ASTM A967 & ASTM B912.
What is Electropolishing?
Electropolishing is an electrochemical and reverse plating process that removes the outer layer of skin on a metal...
The Electropolishing Process
The electropolishing process is initiated by immersing a metal part into a temperature-controlled bath of electrolyte...
How Much Material Does Electropolishing Remove?
Electropolishing, when done properly is a highly controllable process which removes as little as...
How Much Will Electropolishing Improve the Surface of my Part?
Ra and RMS are both representations of surface roughness. Ra is calculated as the roughness average of a surface’s...
What is ASTM B912?
ASTM B912 is an industry standard for the passivation of stainless steel alloys through electropolishing...
What is ASTM A967
ASTM A967 is an industry standard specification for the chemical passivation treatments for stainless...