Rust-preventive composition

摘要

The disclosure describes a rust-preventive composition comprising a layered phosphate whose active hydrogen is reacted with ammonia in an amount of 20 to 80 mol % based on the total amount of hydrogen of the layered phosphate, and an amphoteric or basic oxide, a ratio by weight of the layered phosphate to the amphoteric or basic oxide being 10:1 to 1:10.