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Passivate per QQ-P-35C-Type VII

Stainless steels are corrosion-resistant by nature, which might suggest that passivating them would be unnecessary. However, stainless steels are not completely impervious to rusting. Passivation is performed to remove embedded bits of foreign matter, which allow water molecules to oxidize some of the iron in those spots despite the alloying chromium, and prevent surface from rust.