This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The process of making a material passive (non-reactive) in relation to another material prior to using the materials together.

n. The spontaneous formation of a hard non-reactive surface film (usually an oxide or nitride) that inhibits further corrosion.

"February 10th, Iran informed them that they had begun work there the previous evening on a process called passivation (Lewis explains what that is)."

ultrafiltration    silicon-nitride    epitaxial    customisation    monomolecular