New salts useful as corrosion inhibitors

A composition having corrosion-inhibition properties which comprises

• (a) a major proportion of a non-aqueous functional fluid;
• and
• (b) an effective amount of a corrosion inhibitor of a salt of formula I
• Y--NH.sub.3.sup.+ RCO.sub.2.sup.- (I)
• in which Y is a group of formula R.sup.1 XCH.sub.2 CH(OH)CH.sub.2 --, R and R.sup.1 are the same or different, R.sup.1 is a straight- or branched chain alkyl group having from 1 to 18 carbon atoms, a straight- or branched chain alkenyl group having from 2 to 18 carbon atoms, a cycloalkyl group having from 4 to 12 ring carbon atoms, an aryl group having 6-10 ring carbon atoms, or an aralkyl group having from 7 to 10 carbon atoms;
• R is a straight- or branched chain alkyl group having from 7 to 18 carbon atoms, a straight- or branched chain alkenyl group having from 2 to 18 carbon atoms, a cycloalkyl group having from 4 to 12 ring carbon atoms, an aryl group having 6-10 ring carbon atoms, or an aralkyl group having from 7 to 10 carbon atoms;
• and X is O, CO.sub.2, NR.sup.2 or R.sup. 2 is hydrogen, a straight- or branched chain alkyl group having from 1 to 18 carbon atoms or an alkenyl group having from 2 to 18 carbon atoms.