astm a967 کاملا نو با طرز کار خوب
ASTM A967 – Specification for Chemical Passivation Treatments for Stainless Steel Parts, (based on US Defense Department standard QQ-P-35C) In 1997 an alternative British Standard was published: BS EN 2516 – Passivation of Corrosion Resisting Steels and Decontamination of Nickel Base Alloys