ASTM A967/967M
ASTM A967is the standard specification for chemical Passivation treatments of stainless-steel parts. The ASTM A967 replaced QQ-P-35C which was the original department of defense standard in 1997.
- ASTM A967 covers several practices for using nitric and citric acid at varying temperatures and concentrations to achieve Passivation and restoring the oxide layer, essential to achieving corrosion resistance and removing contaminant iron, alloyed iron and possibly other foreign matter from the surface.
- ASTM 967 does not include pretreatment and procedures that may be necessary before parts or equipment can be passivated. Instead, it References that these methods be conducted in accordance with ASTM A380/A380M practices.
- ASTM A967 also goes over crucial testing methods such as:
- Water immersion test
- High humidity test
- Salt spray (fog) test
- Copper sulfate test
- Potassium Ferricyanide-Nitric Acid test
- Damp cloth test
- Boiling water immersion test
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Why Use ASTM A967
ASTM A967 is used to ensure that your process parts and equipment meet the quality and regulatory requirements in critical processes and applications such as:
- Pharmaceutical
- Medical devices
- Food- processing applications
- Oil and Gas
- Aerospace
- Semiconductor
- Chemical processing