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Passivation - AMS 2700C vs ASTM A967 [California]October 21, 2009 Can you please tell me the differences between the passivation processes AMS2700C vs ASTM A967. I have a note requirement for the ASTM A967, Type 6 or 7 requirement on some parts and the parts were passivated to the AMS2700C, Method 1, Type 6 requirement. Ted Nance
October 23, 2009 The two standards are essentially equivalent. Both contain a
carryover of QQ-P-35C with the addition of the more recently
developed citric acid based process. The AMS standard is used by the
aerospace industry while the ASTM standard is used by generally
everyone else.
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