In the former report, higher fatty amines were prepared by catalytic hydrogenation of nitrile derived from corresponding acid amide converting them from acid. As principal agents for corrosion inhibition, products by the reactions between amines and higher fatty acids have been found best. In the present report, corrosiontests have been made under various conditions using various derivatives of these amines. And the most effective rust inhibitors were found to be the products by the reactions between 1 mol. of n-hexadecylamine and 3 mols. of linolenic acid, or between 1 mol. of di-n-hexadecylamine and 2 mols. of linolenic acid. And moreover, they can resist corrosion not only when used in acidic solutions but when in alkaline salting water.