Snamprogetti S.p.a.

Eniricerche S.p.a.

Marco Cesari

Arnaldo Roggero

Salvatore Cucinella

Luigi Rivola

Tito Salvatori

Yean Demertzis

A method is disclosed for the inhibition of general corrosion, and of stress corrosion by hydrogen sulfide in manganese and low-alloy, medium-strength and high strength steels, obtained by means of the use of compounds of formula:

Inhibitors of corrosion in high-strength and medium-strength steels

An oligomer N-alkyl-iminoalane, made up of a plurality of four and/or six member rings of the formulae: ##STR1## wherein R is an aliphatic, cycloaliphatic or aromatic hydrocarbon combined in a tridimensional cage structure having the chemical composition (HAl-NR).sub.n, in which R has the above meaning and n is a whole number lower than or equal to 10, is prepared by reacting a primary amine containing a secondary or tertiary carbon atom in alpha or beta position with respect to the amine nitrogen atom or amide derivative thereof wherein the amine radical contains a secondary or tertiary carbon atom in alpha or beta position with respect to the nitrogen atom with a complex formed by AlH.sub.3 and a Lewis base, or by reacting said primary amine with an alkali or alkaline-earth metal alanate.

Oligomer N-alkyl-iminoalanes and process for the preparation thereof

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San Donato Milanese, Italy

Marco Cesari