Rust-inhibitors, prepared from three classes of C₈-amines, were tested in acidic solutions and in sea-water. In acidic solutions secondary-amine-type was the best, but in sea-water little differences were found.
Moreover, C₈, C₁₀, C₁₂, C₁₄, C₁₆, and C₁₈-amine-type inhibitors were prepared by reacting them with corresponding acids. Inhibitors with longer alkyl or aryl groups could resist corrosion more than those with lower groups, when they were well dispersed in corrosive media.

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The cis-formed inhibitor prepared by reacting oleylamine with oleic acid, and the trans-formed one prepared by reacting elaidylamine with elaidic acid, were tested as rust-inhibitors both in acidic solution and in sea-water.
The cis-type was somewhat better, as its molecular structure was more favourable to film metal surfaces.

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